integration

72338124 · TokaKaram · 72338124 · 72338124 · 72338124 · 72338124
Commit 72338124 authored Jan 05, 2026 by TokaKaram
53 changed files
--- a/backend/.gitignore
+++ b/backend/.gitignore
+/node_modules
+/.env
\ No newline at end of file
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
--- a/backend/package.json
+++ b/backend/package.json
+{
+  "name": "scenario-learning-backend",
+  "version": "1.0.0",
+  "description": "Backend for Scenario Learning Platform",
+  "main": "src/app.js",
+  "scripts": {
+    "start": "node src/app.js",
+    "dev": "nodemon src/app.js",
+    "test": "jest"
+  },
+  "dependencies": {
+    "express": "^4.18.2",
+    "pg": "^8.11.3",
+    "bcrypt": "^5.1.1",
+    "jsonwebtoken": "^9.0.2",
+    "express-validator": "^7.0.1",
+    "cors": "^2.8.5",
+    "helmet": "^7.1.0",
+    "morgan": "^1.10.0",
+    "dotenv": "^16.3.1",
+    "express-rate-limit": "^7.1.5"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.2",
+    "jest": "^29.7.0"
+  }
+}
\ No newline at end of file
--- a/backend/src/app.js
+++ b/backend/src/app.js
+const express = require("express");
+const cors = require("cors");
+const helmet = require("helmet");
+const morgan = require("morgan");
+const rateLimit = require("express-rate-limit");
+require("dotenv").config();
+const authRoutes = require("./routes/auth");
+const scenarioRoutes = require("./routes/scenarios");
+const progressRoutes = require("./routes/progress");
+const errorHandler = require("./middleware/errorHandler");
+const app = express();
+// Security middleware
+app.use(helmet());
+app.use(
+  cors({
+    origin: process.env.FRONTEND_URL || "http://localhost:3000",
+    credentials: true,
+  })
+);
+// Rate limiting
+const limiter = rateLimit({
+  windowMs: 15 * 60 * 1000, // 15 minutes
+  max: 1000, // limit each IP to 100 requests per windowMs
+});
+app.use("/api/", limiter);
+// Auth rate limiting (stricter)
+const authLimiter = rateLimit({
+  windowMs: 15 * 60 * 1000,
+  max: 10,
+  message: {
+    success: false,
+    message: "Too many attempts, please try again later",
+  },
+});
+app.use("/api/auth/login", authLimiter);
+app.use("/api/auth/register", authLimiter);
+// Body parsing
+app.use(express.json());
+app.use(express.urlencoded({ extended: true }));
+// Logging
+if (process.env.NODE_ENV !== "test") {
+  app.use(morgan("combined"));
+}
+// Health check
+app.get("/health", (req, res) => {
+  res.json({ status: "OK", timestamp: new Date().toISOString() });
+});
+// Routes
+app.use("/api/auth", authRoutes);
+app.use("/api/scenarios", scenarioRoutes);
+app.use("/api/progress", progressRoutes);
+// 404 handler
+app.use((req, res) => {
+  res.status(404).json({
+    success: false,
+    message: "Endpoint not found",
+  });
+});
+// Error handler
+app.use(errorHandler);
+const PORT = process.env.PORT || 5000;
+app.listen(PORT, () => {
+  console.log(`Server running on port ${PORT}`);
+  console.log(`Environment: ${process.env.NODE_ENV || "development"}`);
+});
+module.exports = app;
--- a/backend/src/config/database.js
+++ b/backend/src/config/database.js
+// src/config/database.js
+const { Pool } = require("pg");
+require("dotenv").config();
+const pool = new Pool({
+  host: process.env.DB_HOST,
+  port: process.env.DB_PORT,
+  database: process.env.DB_NAME,
+  user: process.env.DB_USER,
+  password: process.env.DB_PASSWORD,
+  max: 20,
+  idleTimeoutMillis: 30000,
+  connectionTimeoutMillis: 2000,
+});
+pool.on("connect", () => {
+  console.log("Database connected successfully");
+});
+pool.on("error", (err) => {
+  console.error("Unexpected error on idle client", err);
+  process.exit(-1);
+});
+module.exports = {
+  query: (text, params) => pool.query(text, params),
+  getClient: () => pool.connect(),
+  pool,
+};
--- a/backend/src/config/jwt.js
+++ b/backend/src/config/jwt.js
+// src/config/jwt.js
+require("dotenv").config();
+module.exports = {
+  accessToken: {
+    secret: process.env.JWT_ACCESS_SECRET,
+    expiry: process.env.JWT_ACCESS_EXPIRY || "15m",
+  },
+  refreshToken: {
+    secret: process.env.JWT_REFRESH_SECRET,
+    expiry: process.env.JWT_REFRESH_EXPIRY || "7d",
+  },
+};
--- a/backend/src/controllers/authController.js
+++ b/backend/src/controllers/authController.js
+// src/controllers/authController.js
+const jwt = require("jsonwebtoken");
+const crypto = require("crypto");
+const User = require("../models/User");
+const jwtConfig = require("../config/jwt");
+const generateTokens = (user) => {
+  const accessToken = jwt.sign(
+    { userId: user.id, email: user.email, username: user.username },
+    jwtConfig.accessToken.secret,
+    { expiresIn: jwtConfig.accessToken.expiry }
+  );
+  const refreshToken = jwt.sign(
+    { userId: user.id, tokenId: crypto.randomUUID() },
+    jwtConfig.refreshToken.secret,
+    { expiresIn: jwtConfig.refreshToken.expiry }
+  );
+  return { accessToken, refreshToken };
+};
+const register = async (req, res, next) => {
+  try {
+    const { username, email, password } = req.body;
+    // Check if user already exists
+    const existingEmail = await User.findByEmail(email);
+    if (existingEmail) {
+      return res.status(409).json({
+        success: false,
+        message: "Email already registered",
+      });
+    }
+    const existingUsername = await User.findByUsername(username);
+    if (existingUsername) {
+      return res.status(409).json({
+        success: false,
+        message: "Username already taken",
+      });
+    }
+    // Create user
+    const user = await User.create({ username, email, password });
+    // Generate tokens
+    const { accessToken, refreshToken } = generateTokens(user);
+    // Hash and store refresh token
+    const refreshTokenHash = crypto
+      .createHash("sha256")
+      .update(refreshToken)
+      .digest("hex");
+    const expiresAt = new Date(Date.now() + 7 * 24 * 60 * 60 * 1000); // 7 days
+    await User.saveRefreshToken(
+      user.id,
+      refreshTokenHash,
+      expiresAt,
+      req.ip,
+      req.headers["user-agent"]
+    );
+    res.status(201).json({
+      success: true,
+      message: "Registration successful",
+      data: {
+        user: {
+          id: user.id,
+          username: user.username,
+          email: user.email,
+        },
+        accessToken,
+        refreshToken,
+      },
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+const login = async (req, res, next) => {
+  try {
+    const { email, password } = req.body;
+    // Find user
+    const user = await User.findByEmail(email);
+    if (!user) {
+      return res.status(401).json({
+        success: false,
+        message: "Invalid email or password",
+      });
+    }
+    // Verify password
+    const isValidPassword = await User.verifyPassword(
+      password,
+      user.password_hash
+    );
+    if (!isValidPassword) {
+      return res.status(401).json({
+        success: false,
+        message: "Invalid email or password",
+      });
+    }
+    // Generate tokens
+    const { accessToken, refreshToken } = generateTokens(user);
+    // Hash and store refresh token
+    const refreshTokenHash = crypto
+      .createHash("sha256")
+      .update(refreshToken)
+      .digest("hex");
+    console.log("refreshToken=>", refreshToken);
+    console.log("refreshTokenHash=>", refreshTokenHash);
+    const expiresAt = new Date(Date.now() + 7 * 24 * 60 * 60 * 1000);
+    const r = await User.saveRefreshToken(
+      user.id,
+      refreshTokenHash,
+      expiresAt,
+      req.ip,
+      req.headers["user-agent"]
+    );
+    console.log("RR=>", r);
+    res.json({
+      success: true,
+      message: "Login successful",
+      data: {
+        user: {
+          id: user.id,
+          username: user.username,
+          email: user.email,
+        },
+        accessToken,
+        refreshToken,
+      },
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+const refreshToken = async (req, res, next) => {
+  try {
+    const { refreshToken: token } = req.body;
+    if (!token) {
+      return res.status(400).json({
+        success: false,
+        message: "Refresh token required",
+      });
+    }
+    // Verify token
+    let decoded;
+    try {
+      decoded = jwt.verify(token, jwtConfig.refreshToken.secret);
+    } catch (err) {
+      return res.status(401).json({
+        success: false,
+        message: "Invalid refresh token",
+      });
+    }
+    // Check if token exists in database
+    const tokenHash = crypto.createHash("sha256").update(token).digest("hex");
+    console.log("Token=>>", token);
+    console.log("tokenHash=>>", tokenHash);
+    const storedToken = await User.findRefreshToken(tokenHash);
+    console.log("storedToken", storedToken);
+    if (!storedToken) {
+      return res.status(401).json({
+        success: false,
+        message: "Refresh token not found or expired",
+      });
+    }
+    // Get user
+    const user = await User.findById(decoded.userId);
+    if (!user) {
+      return res.status(401).json({
+        success: false,
+        message: "User not found",
+      });
+    }
+    const tokens = generateTokens(user);
+    const newTokenHash = crypto
+      .createHash("sha256")
+      .update(tokens.refreshToken)
+      .digest("hex");
+    const expiresAt = new Date(Date.now() + 7 * 24 * 60 * 60 * 1000);
+    await User.revokeRefreshToken(tokenHash);
+    await User.saveRefreshToken(
+      user.id,
+      newTokenHash,
+      expiresAt,
+      req.ip,
+      req.headers["user-agent"]
+    );
+    res.json({
+      success: true,
+      data: {
+        accessToken: tokens.accessToken,
+        refreshToken: tokens.refreshToken,
+      },
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+const logout = async (req, res, next) => {
+  try {
+    const { refreshToken: token } = req.body;
+    if (token) {
+      const tokenHash = crypto.createHash("sha256").update(token).digest("hex");
+      await User.revokeRefreshToken(tokenHash);
+    }
+    res.json({
+      success: true,
+      message: "Logged out successfully",
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+const getProfile = async (req, res, next) => {
+  try {
+    const user = await User.findById(req.user.userId);
+    if (!user) {
+      return res.status(404).json({
+        success: false,
+        message: "User not found",
+      });
+    }
+    const statistics = await User.getStatistics(req.user.userId);
+    res.json({
+      success: true,
+      data: {
+        user,
+        statistics,
+      },
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+module.exports = {
+  register,
+  login,
+  refreshToken,
+  logout,
+  getProfile,
+};
--- a/backend/src/controllers/progressController.js
+++ b/backend/src/controllers/progressController.js
+// src/controllers/progressController.js
+const Progress = require("../models/Progress");
+const Scenario = require("../models/Scenario");
+const submitAnswer = async (req, res, next) => {
+  try {
+    const { scenarioId, selectedAnswer, timeSpentSeconds } = req.body;
+    const userId = req.user.userId;
+    // Get scenario to verify answer
+    const scenario = await Scenario.findById(scenarioId);
+    if (!scenario) {
+      return res.status(404).json({
+        success: false,
+        message: "Scenario not found",
+      });
+    }
+    // Check if answer is correct
+    const isCorrect = scenario.best_answer.answer === selectedAnswer;
+    // Calculate score (base score + time bonus)
+    let score = isCorrect ? 100 : 0;
+    if (isCorrect && timeSpentSeconds) {
+      // Time bonus: up to 20 extra points for fast answers
+      const timeBonus = Math.max(0, 20 - Math.floor(timeSpentSeconds / 30));
+      score += score >= 100 ? 0 : timeBonus;
+    }
+    // Save progress
+    console.log("Score => ", score);
+    const progress = await Progress.create({
+      userId,
+      scenarioId,
+      selectedAnswer,
+      isCorrect,
+      score,
+      timeSpentSeconds,
+    });
+    // Get feedback
+    let feedback;
+    if (isCorrect) {
+      console.log("isCorrect=>", progress);
+      feedback = {
+        correct: true,
+        rationale: scenario.best_answer.rationale,
+      };
+    } else {
+      // Find the selected wrong answer
+      const wrongAnswer = scenario.other_answers.find(
+        (ans) => ans.answer === selectedAnswer
+      );
+      feedback = {
+        correct: false,
+        explanation:
+          wrongAnswer?.explanation || "This was not the best answer.",
+        correctAnswer: scenario.best_answer.answer,
+        rationale: scenario.best_answer.rationale,
+      };
+    }
+    res.json({
+      success: true,
+      data: {
+        progress: {
+          id: progress.id,
+          isCorrect: progress.is_correct,
+          score: progress.score,
+          attemptNumber: progress.attempt_number,
+        },
+        feedback,
+      },
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+const getUserProgress = async (req, res, next) => {
+  try {
+    const { limit = 10, offset = 0 } = req.query;
+    const userId = req.user.userId;
+    const progress = await Progress.getUserProgress(userId, {
+      limit: parseInt(limit),
+      offset: parseInt(offset),
+    });
+    res.json({
+      success: true,
+      data: progress,
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+const getLeaderboard = async (req, res, next) => {
+  try {
+    const { limit = 10 } = req.query;
+    const leaderboard = await Progress.getLeaderboard(parseInt(limit));
+    res.json({
+      success: true,
+      data: leaderboard,
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+module.exports = {
+  submitAnswer,
+  getUserProgress,
+  getLeaderboard,
+};
--- a/backend/src/controllers/scenarioController.js
+++ b/backend/src/controllers/scenarioController.js
+// src/controllers/scenarioController.js
+const Scenario = require("../models/Scenario");
+const Progress = require("../models/Progress");
+const getScenarioById = async (req, res, next) => {
+  try {
+    const { id } = req.params;
+    const scenario = await Scenario.findById(id);
+    if (!scenario) {
+      return res.status(404).json({
+        success: false,
+        message: "Scenario not found",
+      });
+    }
+    // Check if user has completed this scenario
+    let userProgress = null;
+    if (req.user) {
+      const progressRecords = await Progress.findByUserAndScenario(
+        req.user.userId,
+        id
+      );
+      if (progressRecords.length > 0) {
+        userProgress = {
+          attempts: progressRecords.length,
+          bestScore: Math.max(...progressRecords.map((p) => p.score)),
+          lastAttempt: progressRecords[0],
+        };
+      }
+    }
+    // Prepare response - shuffle answers
+    const allAnswers = [
+      { ...scenario.best_answer, id: "correct" },
+      ...scenario.other_answers.map((ans, idx) => ({
+        ...ans,
+        id: `wrong_${idx}`,
+      })),
+    ];
+    // Fisher-Yates shuffle
+    for (let i = allAnswers.length - 1; i > 0; i--) {
+      const j = Math.floor(Math.random() * (i + 1));
+      [allAnswers[i], allAnswers[j]] = [allAnswers[j], allAnswers[i]];
+    }
+    // Remove rationale/explanation from response (will show after answer)
+    const sanitizedAnswers = allAnswers.map((ans) => ({
+      id: ans.id,
+      answer: ans.answer,
+    }));
+    res.json({
+      success: true,
+      data: {
+        scenario: {
+          id: scenario.id,
+          title: scenario.title,
+          shortDescription: scenario.short_description,
+          givensTable: scenario.givens_table,
+          scenarioParagraph: scenario.scenario_paragraph,
+          difficultyLevel: scenario.difficulty_level,
+          category: scenario.category,
+          tags: scenario.tags,
+        },
+        answers: sanitizedAnswers,
+        userProgress,
+      },
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+const getAllScenarios = async (req, res, next) => {
+  try {
+    const { limit = 10, offset = 0, category, difficulty } = req.query;
+    const result = await Scenario.findAll({
+      limit: parseInt(limit),
+      offset: parseInt(offset),
+      category,
+      difficulty,
+    });
+    // If user is authenticated, add completion status
+    if (req.user) {
+      const completedIds = await Progress.getCompletedScenarioIds(
+        req.user.userId
+      );
+      result.scenarios = result.scenarios.map((scenario) => ({
+        ...scenario,
+        isCompleted: completedIds.includes(scenario.id),
+      }));
+    }
+    res.json({
+      success: true,
+      data: result,
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+const getCategories = async (req, res, next) => {
+  try {
+    const categories = await Scenario.getCategories();
+    res.json({
+      success: true,
+      data: categories,
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+const getScenarioStatistics = async (req, res, next) => {
+  try {
+    const { id } = req.params;
+    const statistics = await Scenario.getStatistics(id);
+    if (!statistics) {
+      return res.status(404).json({
+        success: false,
+        message: "Scenario not found",
+      });
+    }
+    res.json({
+      success: true,
+      data: statistics,
+    });
+  } catch (error) {
+    next(error);
+  }
+};
+module.exports = {
+  getScenarioById,
+  getAllScenarios,
+  getCategories,
+  getScenarioStatistics,
+};
--- a/backend/src/middleware/auth.js
+++ b/backend/src/middleware/auth.js
+// src/middleware/auth.js
+const jwt = require("jsonwebtoken");
+const jwtConfig = require("../config/jwt");
+const authenticateToken = (req, res, next) => {
+  const authHeader = req.headers["authorization"];
+  const token = authHeader && authHeader.split(" ")[1]; // Bearer TOKEN
+  if (!token) {
+    return res.status(401).json({
+      success: false,
+      message: "Access token required",
+    });
+  }
+  jwt.verify(token, jwtConfig.accessToken.secret, (err, decoded) => {
+    if (err) {
+      if (err.name === "TokenExpiredError") {
+        return res.status(401).json({
+          success: false,
+          message: "Token expired",
+          code: "TOKEN_EXPIRED",
+        });
+      }
+      return res.status(403).json({
+        success: false,
+        message: "Invalid token",
+      });
+    }
+    req.user = decoded;
+    next();
+  });
+};
+const optionalAuth = (req, res, next) => {
+  const authHeader = req.headers["authorization"];
+  const token = authHeader && authHeader.split(" ")[1];
+  if (!token) {
+    return next();
+  }
+  jwt.verify(token, jwtConfig.accessToken.secret, (err, decoded) => {
+    if (!err) {
+      req.user = decoded;
+      console.log("decode", decoded);
+      next();
+    } else if (err) {
+      if (err.name === "TokenExpiredError") {
+        return res.status(401).json({
+          success: false,
+          code: "TOKEN_EXPIRED",
+          message: "Access token expired",
+        });
+      }
+      return next();
+    }
+    console.log("err=>", err);
+  });
+};
+module.exports = { authenticateToken, optionalAuth };
--- a/backend/src/middleware/errorHandler.js
+++ b/backend/src/middleware/errorHandler.js
+// src/middleware/errorHandler.js
+const errorHandler = (err, req, res, next) => {
+  console.error("Error:", err);
+  // PostgreSQL unique violation
+  if (err.code === "23505") {
+    const field = err.constraint?.includes("email") ? "email" : "username";
+    return res.status(409).json({
+      success: false,
+      message: `${
+        field.charAt(0).toUpperCase() + field.slice(1)
+      } already exists`,
+    });
+  }
+  // PostgreSQL foreign key violation
+  if (err.code === "23503") {
+    return res.status(400).json({
+      success: false,
+      message: "Referenced resource does not exist",
+    });
+  }
+  // JWT errors
+  if (err.name === "JsonWebTokenError") {
+    return res.status(401).json({
+      success: false,
+      message: "Invalid token",
+    });
+  }
+  if (err.name === "TokenExpiredError") {
+    return res.status(401).json({
+      success: false,
+      message: "Token expired",
+      code: "TOKEN_EXPIRED",
+    });
+  }
+  // Default error
+  res.status(err.status || 500).json({
+    success: false,
+    message: err.message || "Internal server error",
+  });
+};
+module.exports = errorHandler;
--- a/backend/src/middleware/validation.js
+++ b/backend/src/middleware/validation.js
+// src/middleware/validation.js
+const { body, param, query, validationResult } = require("express-validator");
+const handleValidationErrors = (req, res, next) => {
+  const errors = validationResult(req);
+  if (!errors.isEmpty()) {
+    return res.status(400).json({
+      success: false,
+      message: "Validation failed",
+      errors: errors.array().map((err) => ({
+        field: err.path,
+        message: err.msg,
+      })),
+    });
+  }
+  next();
+};
+const registerValidation = [
+  body("username")
+    .trim()
+    .isLength({ min: 3, max: 50 })
+    .withMessage("Username must be between 3 and 50 characters")
+    .matches(/^[a-zA-Z0-9_]+$/)
+    .withMessage("Username can only contain letters, numbers, and underscores"),
+  body("email")
+    .trim()
+    .isEmail()
+    .withMessage("Invalid email address")
+    .normalizeEmail(),
+  body("password")
+    .isLength({ min: 8 })
+    .withMessage("Password must be at least 8 characters")
+    .matches(/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)/)
+    .withMessage(
+      "Password must contain at least one lowercase letter, one uppercase letter, and one number"
+    ),
+  handleValidationErrors,
+];
+const loginValidation = [
+  body("email")
+    .trim()
+    .isEmail()
+    .withMessage("Invalid email address")
+    .normalizeEmail(),
+  body("password").notEmpty().withMessage("Password is required"),
+  handleValidationErrors,
+];
+const scenarioIdValidation = [
+  param("id")
+    .matches(/^SCEN-\d{6}$/)
+    .withMessage("Invalid scenario ID format"),
+  handleValidationErrors,
+];
+const progressValidation = [
+  body("scenarioId")
+    .matches(/^SCEN-\d{6}$/)
+    .withMessage("Invalid scenario ID format"),
+  body("selectedAnswer")
+    .trim()
+    .notEmpty()
+    .withMessage("Selected answer is required"),
+  body("timeSpentSeconds")
+    .optional()
+    .isInt({ min: 0 })
+    .withMessage("Time spent must be a positive integer"),
+  handleValidationErrors,
+];
+const paginationValidation = [
+  query("limit")
+    .optional()
+    .isInt({ min: 1, max: 100 })
+    .withMessage("Limit must be between 1 and 100"),
+  query("offset")
+    .optional()
+    .isInt({ min: 0 })
+    .withMessage("Offset must be a non-negative integer"),
+  handleValidationErrors,
+];
+module.exports = {
+  registerValidation,
+  loginValidation,
+  scenarioIdValidation,
+  progressValidation,
+  paginationValidation,
+  handleValidationErrors,
+};
--- a/backend/src/models/Progress.js
+++ b/backend/src/models/Progress.js
+// src/models/Progress.js
+const db = require("../config/database");
+class Progress {
+  static async create({
+    userId,
+    scenarioId,
+    selectedAnswer,
+    isCorrect,
+    score,
+    timeSpentSeconds,
+  }) {
+    const query = `
+            INSERT INTO user_progress (
+                user_id, scenario_id, selected_answer, is_correct, score, time_spent_seconds
+            )
+            VALUES ($1, $2, $3, $4, $5, $6)
+            RETURNING *
+        `;
+    const result = await db.query(query, [
+      userId,
+      scenarioId,
+      selectedAnswer,
+      isCorrect,
+      score,
+      timeSpentSeconds,
+    ]);
+    return result.rows[0];
+  }
+  static async findByUserAndScenario(userId, scenarioId) {
+    const query = `
+            SELECT * FROM user_progress 
+            WHERE user_id = $1 AND scenario_id = $2
+            ORDER BY attempt_number DESC
+        `;
+    const result = await db.query(query, [userId, scenarioId]);
+    return result.rows;
+  }
+  static async getUserProgress(userId, { limit = 10, offset = 0 }) {
+    const query = `
+            SELECT 
+                up.*,
+                s.title as scenario_title,
+                s.difficulty_level,
+                s.category
+            FROM user_progress up
+            JOIN scenarios s ON up.scenario_id = s.id
+            WHERE up.user_id = $1
+            ORDER BY up.completed_at DESC
+            LIMIT $2 OFFSET $3
+        `;
+    const result = await db.query(query, [userId, limit, offset]);
+    return result.rows;
+  }
+  static async getCompletedScenarioIds(userId) {
+    const query = `
+            SELECT DISTINCT scenario_id 
+            FROM user_progress 
+            WHERE user_id = $1 AND is_correct = true
+        `;
+    const result = await db.query(query, [userId]);
+    return result.rows.map((row) => row.scenario_id);
+  }
+  static async getLeaderboard(limit = 10) {
+    const query = `
+            SELECT 
+                u.username,
+                COUNT(DISTINCT up.scenario_id) as scenarios_completed,
+                ROUND(AVG(up.score)::NUMERIC, 2) as average_score,
+                SUM(CASE WHEN up.is_correct THEN 1 ELSE 0 END) as correct_answers
+            FROM users u
+            JOIN user_progress up ON u.id = up.user_id
+            GROUP BY u.id, u.username
+            ORDER BY average_score DESC, scenarios_completed DESC
+            LIMIT $1
+        `;
+    const result = await db.query(query, [limit]);
+    return result.rows;
+  }
+}
+module.exports = Progress;
--- a/backend/src/models/Scenario.js
+++ b/backend/src/models/Scenario.js
+// src/models/Scenario.js
+const db = require("../config/database");
+class Scenario {
+  static async findById(id) {
+    const query = `
+            SELECT * FROM scenarios 
+            WHERE id = $1 AND is_active = true
+        `;
+    const result = await db.query(query, [id]);
+    return result.rows[0];
+  }
+  static async findAll({ limit = 10, offset = 0, category, difficulty }) {
+    let query = `
+            SELECT id, title, short_description, difficulty_level, category, tags, created_at
+            FROM scenarios 
+            WHERE is_active = true
+        `;
+    const params = [];
+    let paramCount = 0;
+    if (category) {
+      paramCount++;
+      query += ` AND category = $${paramCount}`;
+      params.push(category);
+    }
+    if (difficulty) {
+      paramCount++;
+      query += ` AND difficulty_level = $${paramCount}`;
+      params.push(difficulty);
+    }
+    query += ` ORDER BY created_at DESC`;
+    paramCount++;
+    query += ` LIMIT $${paramCount}`;
+    params.push(limit);
+    paramCount++;
+    query += ` OFFSET $${paramCount}`;
+    params.push(offset);
+    const result = await db.query(query, params);
+    // Get total count
+    let countQuery = "SELECT COUNT(*) FROM scenarios WHERE is_active = true";
+    const countParams = [];
+    let countParamNum = 0;
+    if (category) {
+      countParamNum++;
+      countQuery += ` AND category = $${countParamNum}`;
+      countParams.push(category);
+    }
+    if (difficulty) {
+      countParamNum++;
+      countQuery += ` AND difficulty_level = $${countParamNum}`;
+      countParams.push(difficulty);
+    }
+    const countResult = await db.query(countQuery, countParams);
+    return {
+      scenarios: result.rows,
+      total: parseInt(countResult.rows[0].count),
+      limit,
+      offset,
+    };
+  }
+  static async getCategories() {
+    const query = `
+            SELECT DISTINCT category 
+            FROM scenarios 
+            WHERE is_active = true AND category IS NOT NULL
+            ORDER BY category
+        `;
+    const result = await db.query(query);
+    return result.rows.map((row) => row.category);
+  }
+  static async getStatistics(scenarioId) {
+    const query = "SELECT * FROM scenario_statistics WHERE scenario_id = $1";
+    const result = await db.query(query, [scenarioId]);
+    return result.rows[0];
+  }
+  static async create(scenarioData) {
+    const {
+      title,
+      short_description,
+      givens_table,
+      scenario_paragraph,
+      best_answer,
+      other_answers,
+      difficulty_level,
+      category,
+      tags,
+    } = scenarioData;
+    const query = `
+            INSERT INTO scenarios (
+                title, short_description, givens_table, scenario_paragraph,
+                best_answer, other_answers, difficulty_level, category, tags
+            )
+            VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
+            RETURNING *
+        `;
+    const result = await db.query(query, [
+      title,
+      short_description,
+      JSON.stringify(givens_table),
+      scenario_paragraph,
+      JSON.stringify(best_answer),
+      JSON.stringify(other_answers),
+      difficulty_level || "medium",
+      category,
+      tags,
+    ]);
+    return result.rows[0];
+  }
+}
+module.exports = Scenario;
--- a/backend/src/models/User.js
+++ b/backend/src/models/User.js
+// src/models/User.js
+const db = require("../config/database");
+const bcrypt = require("bcrypt");
+class User {
+  static async create({ username, email, password }) {
+    const saltRounds = 12;
+    const passwordHash = await bcrypt.hash(password, saltRounds);
+    const query = `
+            INSERT INTO users (username, email, password_hash)
+            VALUES ($1, $2, $3)
+            RETURNING id, username, email, created_at
+        `;
+    const result = await db.query(query, [username, email, passwordHash]);
+    return result.rows[0];
+  }
+  static async findByEmail(email) {
+    const query = "SELECT * FROM users WHERE email = $1 AND is_active = true";
+    const result = await db.query(query, [email]);
+    return result.rows[0];
+  }
+  static async findByUsername(username) {
+    const query =
+      "SELECT * FROM users WHERE username = $1 AND is_active = true";
+    const result = await db.query(query, [username]);
+    return result.rows[0];
+  }
+  static async findById(id) {
+    const query = `
+            SELECT id, username, email, created_at, updated_at 
+            FROM users 
+            WHERE id = $1 AND is_active = true
+        `;
+    const result = await db.query(query, [id]);
+    return result.rows[0];
+  }
+  static async verifyPassword(plainPassword, hashedPassword) {
+    return bcrypt.compare(plainPassword, hashedPassword);
+  }
+  static async getStatistics(userId) {
+    const query = "SELECT * FROM user_statistics WHERE user_id = $1";
+    const result = await db.query(query, [userId]);
+    return result.rows[0];
+  }
+  static async saveRefreshToken(
+    userId,
+    tokenHash,
+    expiresAt,
+    ipAddress,
+    userAgent
+  ) {
+    const query = `
+            INSERT INTO user_sessions (user_id, refresh_token_hash, expires_at, ip_address, user_agent)
+            VALUES ($1, $2, $3, $4, $5)
+            RETURNING id
+        `;
+    const result = await db.query(query, [
+      userId,
+      tokenHash,
+      expiresAt,
+      ipAddress,
+      userAgent,
+    ]);
+    return result.rows[0];
+  }
+  static async findRefreshToken(tokenHash) {
+    const query = `
+            SELECT * FROM user_sessions 
+            WHERE refresh_token_hash = $1 
+            AND is_revoked = false 
+            AND expires_at > NOW()
+        `;
+    const result = await db.query(query, [tokenHash]);
+    return result.rows[0];
+  }
+  static async revokeRefreshToken(tokenHash) {
+    const query = `
+            UPDATE user_sessions 
+            SET is_revoked = true 
+            WHERE refresh_token_hash = $1
+        `;
+    await db.query(query, [tokenHash]);
+  }
+  static async revokeAllUserTokens(userId) {
+    const query = `
+            UPDATE user_sessions 
+            SET is_revoked = true 
+            WHERE user_id = $1
+        `;
+    await db.query(query, [userId]);
+  }
+}
+module.exports = User;
--- a/backend/src/routes/auth.js
+++ b/backend/src/routes/auth.js
+const express = require("express");
+const router = express.Router();
+const authController = require("../controllers/authController");
+const { authenticateToken } = require("../middleware/auth");
+const {
+  registerValidation,
+  loginValidation,
+} = require("../middleware/validation");
+router.post("/register", registerValidation, authController.register);
+router.post("/login", loginValidation, authController.login);
+router.post("/refresh-token", authController.refreshToken);
+router.post("/logout", authController.logout);
+router.get("/profile", authenticateToken, authController.getProfile);
+module.exports = router;
--- a/backend/src/routes/progress.js
+++ b/backend/src/routes/progress.js
+const express = require("express");
+const router = express.Router();
+const progressController = require("../controllers/progressController");
+const { authenticateToken } = require("../middleware/auth");
+const {
+  progressValidation,
+  paginationValidation,
+} = require("../middleware/validation");
+router.post(
+  "/submit",
+  authenticateToken,
+  progressValidation,
+  progressController.submitAnswer
+);
+router.get(
+  "/",
+  authenticateToken,
+  paginationValidation,
+  progressController.getUserProgress
+);
+router.get(
+  "/leaderboard",
+  paginationValidation,
+  progressController.getLeaderboard
+);
+module.exports = router;
--- a/backend/src/routes/scenarios.js
+++ b/backend/src/routes/scenarios.js
+const express = require("express");
+const router = express.Router();
+const scenarioController = require("../controllers/scenarioController");
+const { authenticateToken, optionalAuth } = require("../middleware/auth");
+const {
+  scenarioIdValidation,
+  paginationValidation,
+} = require("../middleware/validation");
+router.get(
+  "/",
+  optionalAuth,
+  paginationValidation,
+  scenarioController.getAllScenarios
+);
+router.get("/categories", scenarioController.getCategories);
+router.get(
+  "/:id",
+  optionalAuth,
+  scenarioIdValidation,
+  scenarioController.getScenarioById
+);
+router.get(
+  "/:id/statistics",
+  scenarioIdValidation,
+  scenarioController.getScenarioStatistics
+);
+module.exports = router;
--- a/frontend/.gitignore
+++ b/frontend/.gitignore
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+node_modules
+dist
+dist-ssr
+*.local
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
--- a/frontend/README.md
+++ b/frontend/README.md
+# React + Vite
+This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+Currently, two official plugins are available:
+- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Babel](https://babeljs.io/) (or [oxc](https://oxc.rs) when used in [rolldown-vite](https://vite.dev/guide/rolldown)) for Fast Refresh
+- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
+## React Compiler
+The React Compiler is not enabled on this template because of its impact on dev & build performances. To add it, see [this documentation](https://react.dev/learn/react-compiler/installation).
+## Expanding the ESLint configuration
+If you are developing a production application, we recommend using TypeScript with type-aware lint rules enabled. Check out the [TS template](https://github.com/vitejs/vite/tree/main/packages/create-vite/template-react-ts) for information on how to integrate TypeScript and [`typescript-eslint`](https://typescript-eslint.io) in your project.
--- a/frontend/eslint.config.js
+++ b/frontend/eslint.config.js
+import js from '@eslint/js'
+import globals from 'globals'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import { defineConfig, globalIgnores } from 'eslint/config'
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{js,jsx}'],
+    extends: [
+      js.configs.recommended,
+      reactHooks.configs.flat.recommended,
+      reactRefresh.configs.vite,
+    ],
+    languageOptions: {
+      ecmaVersion: 2020,
+      globals: globals.browser,
+      parserOptions: {
+        ecmaVersion: 'latest',
+        ecmaFeatures: { jsx: true },
+        sourceType: 'module',
+      },
+    },
+    rules: {
+      'no-unused-vars': ['error', { varsIgnorePattern: '^[A-Z_]' }],
+    },
+  },
+])
--- a/frontend/index.html
+++ b/frontend/index.html
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>frontend</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.jsx"></script>
+  </body>
+</html>
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
--- a/frontend/package.json
+++ b/frontend/package.json
+{
+  "name": "frontend",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "lint": "eslint .",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@tailwindcss/postcss": "^4.1.18",
+    "axios": "^1.13.2",
+    "lucide-react": "^0.562.0",
+    "react": "^19.2.3",
+    "react-dom": "^19.2.3",
+    "react-router-dom": "^7.11.0"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.39.1",
+    "@types/react": "^19.2.5",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^5.1.2",
+    "autoprefixer": "^10.4.23",
+    "eslint": "^9.39.1",
+    "eslint-plugin-react-hooks": "^7.0.1",
+    "eslint-plugin-react-refresh": "^0.4.24",
+    "globals": "^16.5.0",
+    "postcss": "^8.5.6",
+    "tailwindcss": "^4.1.18",
+    "vite": "^7.3.0"
+  }
+}
--- a/frontend/postcss.config.js
+++ b/frontend/postcss.config.js
+export default {
+  plugins: {
+    "@tailwindcss/postcss": {},
+    autoprefixer: {},
+  },
+};
--- a/frontend/public/default.jpg
+++ b/frontend/public/default.jpg
--- a/frontend/public/vite.svg
+++ b/frontend/public/vite.svg
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>
\ No newline at end of file
--- a/frontend/src/App.css
+++ b/frontend/src/App.css
+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+.logo {
+  height: 6em;
+  padding: 1.5em;
+  will-change: filter;
+  transition: filter 300ms;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #646cffaa);
+}
+.logo.react:hover {
+  filter: drop-shadow(0 0 2em #61dafbaa);
+}
+@keyframes logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+@media (prefers-reduced-motion: no-preference) {
+  a:nth-of-type(2) .logo {
+    animation: logo-spin infinite 20s linear;
+  }
+}
+.card {
+  padding: 2em;
+}
+.read-the-docs {
+  color: #888;
+}
+p {
+  margin: 0 !important;
+}
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
+import { BrowserRouter as Router, Routes, Route, Navigate } from 'react-router-dom';
+import { AuthProvider } from './context/AuthContext';
+import Navbar from './components/common/Navbar';
+import ProtectedRoute from './components/common/ProtectedRoute';
+import LoginForm from './components/auth/LoginForm';
+import RegisterForm from './components/auth/RegisterForm';
+import ScenarioDashboard from './components/scenario/ScenarioDashboard';
+import ScenarioDetail from './components/scenario/ScenarioDetail';
+import UserProfile from './components/profile/UserProfile';
+function App() {
+    return (
+         <Router>
+        <AuthProvider>
+                <div className="min-h-screen bg-gray-50">
+                    <Navbar />
+                    <main>
+                        <Routes>
+                            <Route path="/" element={<Navigate to="/scenarios" replace />} />
+                            <Route path="/login" element={<LoginForm />} />
+                            <Route path="/register" element={<RegisterForm />} />
+                            <Route path="/scenarios" element={<ScenarioDashboard />} />
+                            <Route path="/scenarios/:id" element={<ScenarioDetail />} />
+                            <Route 
+                                path="/profile" 
+                                element={
+                                    <ProtectedRoute>
+                                        <UserProfile />
+                                    </ProtectedRoute>
+                                } 
+                            />
+                        </Routes>
+                    </main>
+                </div>
+        </AuthProvider>
+          </Router>
+    );
+}
+export default App;
\ No newline at end of file
--- a/frontend/src/assets/react.svg
+++ b/frontend/src/assets/react.svg
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>
\ No newline at end of file
--- a/frontend/src/components/auth/AuthLayout.jsx
+++ b/frontend/src/components/auth/AuthLayout.jsx
+import { BookOpen } from 'lucide-react';
+import { Link } from 'react-router-dom';
+const AuthLayout = ({ children, title, subtitle }) => {
+    return (
+        <div className="min-h-screen bg-gradient-to-br from-indigo-100 via-white to-purple-100 flex flex-col justify-center py-12 sm:px-6 lg:px-8">
+            <div className="sm:mx-auto sm:w-full sm:max-w-md">
+                <Link to="/" className="flex justify-center items-center space-x-2">
+                    <BookOpen className="h-12 w-12 text-indigo-600" />
+                    <span className="font-bold text-2xl text-gray-900">ScenarioLearn</span>
+                </Link>
+                <h2 className="mt-6 text-center text-3xl font-extrabold text-gray-900">
+                    {title}
+                </h2>
+                {subtitle && (
+                    <p className="mt-2 text-center text-sm text-gray-600">
+                        {subtitle}
+                    </p>
+                )}
+            </div>
+            <div className="mt-8 sm:mx-auto sm:w-full sm:max-w-md">
+                <div className="bg-white py-8 px-4 shadow-xl rounded-lg sm:px-10">
+                    {children}
+                </div>
+            </div>
+        </div>
+    );
+};
+export default AuthLayout;
\ No newline at end of file
--- a/frontend/src/components/auth/LoginForm.jsx
+++ b/frontend/src/components/auth/LoginForm.jsx
+import { useState } from 'react';
+import { Link, useNavigate, useLocation } from 'react-router-dom';
+import { useAuth } from '../../context/ContextUsing';
+import AuthLayout from './AuthLayout';
+import Alert from '../common/Alert';
+import { Eye, EyeOff, Mail, Lock } from 'lucide-react';
+const LoginForm = () => {
+    const [formData, setFormData] = useState({ email: '', password: '' });
+    const [showPassword, setShowPassword] = useState(false);
+    const [loading, setLoading] = useState(false);
+    const { login, error, clearError } = useAuth();
+    const navigate = useNavigate();
+    const location = useLocation();
+    const from = location.state?.from?.pathname || '/scenarios';
+    const handleChange = (e) => {
+        clearError();
+        setFormData({ ...formData, [e.target.name]: e.target.value });
+    };
+    const handleSubmit = async (e) => {
+        e.preventDefault();
+        setLoading(true);
+        const result = await login(formData.email, formData.password);
+        setLoading(false);
+        if (result.success) {
+            navigate(from, { replace: true });
+        }
+    };
+    return (
+        <AuthLayout
+            title="Welcome back"
+            subtitle={
+                <>
+                    Don't have an account?{' '}
+                    <Link to="/register" className="text-indigo-600 hover:text-indigo-500 font-medium">
+                        Sign up
+                    </Link>
+                </>
+            }
+        >
+            <form onSubmit={handleSubmit} className="space-y-6">
+                {error && <Alert type="error" message={error} onClose={clearError} />}
+                <div>
+                    <label htmlFor="email" className="block text-sm font-medium text-gray-700">
+                        Email address
+                    </label>
+                    <div className="mt-1 relative">
+                        <div className="absolute inset-y-0 left-0 pl-3 flex items-center">
+                            <Mail className="h-5 w-5 text-gray-400" />
+                        </div>
+                        <input
+                            id="email"
+                            name="email"
+                            type="email"
+                            autoComplete="email"
+                            required
+                            value={formData.email}
+                            onChange={handleChange}
+                            className="appearance-none block w-full pl-10 pr-3 py-2 border border-gray-300 rounded-md shadow-sm placeholder-gray-400 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500"
+                            placeholder="you@example.com"
+                        />
+                    </div>
+                </div>
+                <div>
+                    <label htmlFor="password" className="block text-sm font-medium text-gray-700">
+                        Password
+                    </label>
+                    <div className="mt-1 relative">
+                        <div className="absolute inset-y-0 left-0 pl-3 flex items-center">
+                            <Lock className="h-5 w-5 text-gray-400" />
+                        </div>
+                        <input
+                            id="password"
+                            name="password"
+                            type={showPassword ? 'text' : 'password'}
+                            autoComplete="current-password"
+                            required
+                            value={formData.password}
+                            onChange={handleChange}
+                            className="appearance-none block w-full pl-10 pr-10 py-2 border border-gray-300 rounded-md shadow-sm placeholder-gray-400 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500"
+                            placeholder="••••••••"
+                        />
+                        <button
+                            type="button"
+                            onClick={() => setShowPassword(!showPassword)}
+                            className="absolute inset-y-0 right-0 pr-3 flex items-center"
+                        >
+                            {showPassword ? (
+                                <EyeOff className="h-5 w-5 text-gray-400" />
+                            ) : (
+                                <Eye className="h-5 w-5 text-gray-400" />
+                            )}
+                        </button>
+                    </div>
+                </div>
+                <button
+                    type="submit"
+                    disabled={loading}
+                    className="w-full flex justify-center py-2 px-4 border border-transparent rounded-md shadow-sm text-sm font-medium text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 disabled:opacity-50 disabled:cursor-not-allowed"
+                >
+                    {loading ? 'Signing in...' : 'Sign in'}
+                </button>
+            </form>
+        </AuthLayout>
+    );
+};
+export default LoginForm;
\ No newline at end of file
--- a/frontend/src/components/auth/RegisterForm.jsx
+++ b/frontend/src/components/auth/RegisterForm.jsx
+import { useState } from 'react';
+import { Link, useNavigate } from 'react-router-dom';
+import { useAuth } from '../../context/ContextUsing';
+import AuthLayout from './AuthLayout';
+import Alert from '../common/Alert';
+import { Eye, EyeOff, Mail, Lock, User } from 'lucide-react';
+const RegisterForm = () => {
+    const [formData, setFormData] = useState({
+        username: '',
+        email: '',
+        password: '',
+        confirmPassword: ''
+    });
+    const [showPassword, setShowPassword] = useState(false);
+    const [loading, setLoading] = useState(false);
+    const [validationError, setValidationError] = useState('');
+    const { register, error, clearError } = useAuth();
+    const navigate = useNavigate();
+    const handleChange = (e) => {
+        clearError();
+        setValidationError('');
+        setFormData({ ...formData, [e.target.name]: e.target.value });
+    };
+    const validateForm = () => {
+        if (formData.password !== formData.confirmPassword) {
+            setValidationError('Passwords do not match');
+            return false;
+        }
+        if (formData.password.length < 8) {
+            setValidationError('Password must be at least 8 characters');
+            return false;
+        }
+        if (!/(?=.*[a-z])(?=.*[A-Z])(?=.*\d)/.test(formData.password)) {
+            setValidationError('Password must contain uppercase, lowercase, and number');
+            return false;
+        }
+        if (formData.username.length < 3) {
+            setValidationError('Username must be at least 3 characters');
+            return false;
+        }
+        return true;
+    };
+    const handleSubmit = async (e) => {
+        e.preventDefault();
+        if (!validateForm()) return;
+        setLoading(true);
+        const result = await register(formData.username, formData.email, formData.password);
+        setLoading(false);
+        if (result.success) {
+            navigate('/scenarios');
+        }
+    };
+    const displayError = validationError || error;
+    return (
+        <AuthLayout
+            title="Create your account"
+            subtitle={
+                <>
+                    Already have an account?{' '}
+                    <Link to="/login" className="text-indigo-600 hover:text-indigo-500 font-medium">
+                        Sign in
+                    </Link>
+                </>
+            }
+        >
+            <form onSubmit={handleSubmit} className="space-y-6">
+                {displayError && (
+                    <Alert 
+                        type="error" 
+                        message={displayError} 
+                        onClose={() => { clearError(); setValidationError(''); }} 
+                    />
+                )}
+                <div>
+                    <label htmlFor="username" className="block text-sm font-medium text-gray-700">
+                        Username
+                    </label>
+                    <div className="mt-1 relative">
+                        <div className="absolute inset-y-0 left-0 pl-3 flex items-center">
+                            <User className="h-5 w-5 text-gray-400" />
+                        </div>
+                        <input
+                            id="username"
+                            name="username"
+                            type="text"
+                            required
+                            value={formData.username}
+                            onChange={handleChange}
+                            className="appearance-none block w-full pl-10 pr-3 py-2 border border-gray-300 rounded-md shadow-sm placeholder-gray-400 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500"
+                            placeholder="johndoe"
+                        />
+                    </div>
+                </div>
+                <div>
+                    <label htmlFor="email" className="block text-sm font-medium text-gray-700">
+                        Email address
+                    </label>
+                    <div className="mt-1 relative">
+                        <div className="absolute inset-y-0 left-0 pl-3 flex items-center">
+                            <Mail className="h-5 w-5 text-gray-400" />
+                        </div>
+                        <input
+                            id="email"
+                            name="email"
+                            type="email"
+                            autoComplete="email"
+                            required
+                            value={formData.email}
+                            onChange={handleChange}
+                            className="appearance-none block w-full pl-10 pr-3 py-2 border border-gray-300 rounded-md shadow-sm placeholder-gray-400 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500"
+                            placeholder="you@example.com"
+                        />
+                    </div>
+                </div>
+                <div>
+                    <label htmlFor="password" className="block text-sm font-medium text-gray-700">
+                        Password
+                    </label>
+                    <div className="mt-1 relative">
+                        <div className="absolute inset-y-0 left-0 pl-3 flex items-center">
+                            <Lock className="h-5 w-5 text-gray-400" />
+                        </div>
+                        <input
+                            id="password"
+                            name="password"
+                            type={showPassword ? 'text' : 'password'}
+                            required
+                            value={formData.password}
+                            onChange={handleChange}
+                            className="appearance-none block w-full pl-10 pr-10 py-2 border border-gray-300 rounded-md shadow-sm placeholder-gray-400 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500"
+                            placeholder="••••••••"
+                        />
+                        <button
+                            type="button"
+                            onClick={() => setShowPassword(!showPassword)}
+                            className="absolute inset-y-0 right-0 pr-3 flex items-center"
+                        >
+                            {showPassword ? (
+                                <EyeOff className="h-5 w-5 text-gray-400" />
+                            ) : (
+                                <Eye className="h-5 w-5 text-gray-400" />
+                            )}
+                        </button>
+                    </div>
+                    <p className="mt-1 text-xs text-gray-500">
+                        Min 8 characters with uppercase, lowercase, and number
+                    </p>
+                </div>
+                <div>
+                    <label htmlFor="confirmPassword" className="block text-sm font-medium text-gray-700">
+                        Confirm Password
+                    </label>
+                    <div className="mt-1 relative">
+                        <div className="absolute inset-y-0 left-0 pl-3 flex items-center">
+                            <Lock className="h-5 w-5 text-gray-400" />
+                        </div>
+                        <input
+                            id="confirmPassword"
+                            name="confirmPassword"
+                            type="password"
+                            required
+                            value={formData.confirmPassword}
+                            onChange={handleChange}
+                            className="appearance-none block w-full pl-10 pr-3 py-2 border border-gray-300 rounded-md shadow-sm placeholder-gray-400 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500"
+                            placeholder="••••••••"
+                        />
+                    </div>
+                </div>
+                <button
+                    type="submit"
+                    disabled={loading}
+                    className="w-full flex justify-center py-2 px-4 border border-transparent rounded-md shadow-sm text-sm font-medium text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 disabled:opacity-50 disabled:cursor-not-allowed"
+                >
+                    {loading ? 'Creating account...' : 'Create account'}
+                </button>
+            </form>
+        </AuthLayout>
+    );
+};
+export default RegisterForm;
\ No newline at end of file
--- a/frontend/src/components/common/Alert.jsx
+++ b/frontend/src/components/common/Alert.jsx
+import { CheckCircle, XCircle, AlertCircle, X } from 'lucide-react';
+const Alert = ({ type = 'info', message, onClose }) => {
+    const styles = {
+        success: {
+            bg: 'bg-green-50',
+            border: 'border-green-400',
+            text: 'text-green-800',
+            icon: <CheckCircle className="h-5 w-5 text-green-400" />
+        },
+        error: {
+            bg: 'bg-red-50',
+            border: 'border-red-400',
+            text: 'text-red-800',
+            icon: <XCircle className="h-5 w-5 text-red-400" />
+        },
+        warning: {
+            bg: 'bg-yellow-50',
+            border: 'border-yellow-400',
+            text: 'text-yellow-800',
+            icon: <AlertCircle className="h-5 w-5 text-yellow-400" />
+        },
+        info: {
+            bg: 'bg-blue-50',
+            border: 'border-blue-400',
+            text: 'text-blue-800',
+            icon: <AlertCircle className="h-5 w-5 text-blue-400" />
+        }
+    };
+    const style = styles[type];
+    return (
+        <div className={`${style.bg} ${style.border} border rounded-md p-4`}>
+            <div className="flex">
+                <div className="flex-shrink-0">{style.icon}</div>
+                <div className={`ml-3 ${style.text}`}>
+                    <p className="text-sm font-medium">{message}</p>
+                </div>
+                {onClose && (
+                    <div className="ml-auto pl-3">
+                        <button
+                            onClick={onClose}
+                            className={`${style.text} hover:opacity-75`}
+                        >
+                            <X className="h-5 w-5" />
+                        </button>
+                    </div>
+                )}
+            </div>
+        </div>
+    );
+};
+export default Alert;
\ No newline at end of file
--- a/frontend/src/components/common/Loading.jsx
+++ b/frontend/src/components/common/Loading.jsx
+const Loading = ({ size = 'medium', text = 'Loading...' }) => {
+    const sizeClasses = {
+        small: 'h-4 w-4',
+        medium: 'h-8 w-8',
+        large: 'h-12 w-12'
+    };
+    return (
+        <div className="flex flex-col items-center justify-center p-8">
+            <div className={`animate-spin rounded-full border-b-2 border-indigo-600 ${sizeClasses[size]}`}></div>
+            {text && <p className="mt-4 text-gray-600">{text}</p>}
+        </div>
+    );
+};
+export default Loading;
\ No newline at end of file
--- a/frontend/src/components/common/Navbar.jsx
+++ b/frontend/src/components/common/Navbar.jsx
+import { Link, useNavigate } from 'react-router-dom';
+import { useAuth } from '../../context/ContextUsing';
+import { LogOut, User, BookOpen, Trophy } from 'lucide-react';
+const Navbar = () => {
+    const { user, logout, isAuthenticated } = useAuth();
+    const navigate = useNavigate();
+    const handleLogout = async () => {
+        await logout();
+        navigate('/login');
+    };
+    return (
+        <nav className="bg-white shadow-lg">
+            <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
+                <div className="flex justify-between h-16">
+                    <div className="flex items-center">
+                        <Link to="/" className="flex items-center space-x-2">
+                            <BookOpen className="h-8 w-8 text-indigo-600" />
+                            <span className="font-bold text-xl text-gray-900">
+                                ScenarioLearn
+                            </span>
+                        </Link>
+                        <div className="hidden md:flex ml-10 space-x-8">
+                            <Link
+                                to="/scenarios"
+                                className="text-gray-600 hover:text-indigo-600 px-3 py-2 text-sm font-medium"
+                            >
+                                Scenarios
+                            </Link>
+                        </div>
+                    </div>
+                    <div className="flex items-center space-x-4">
+                        {isAuthenticated ? (
+                            <>
+                                <Link
+                                    to="/profile"
+                                    className="flex items-center text-gray-600 hover:text-indigo-600"
+                                >
+                                    <User className="h-5 w-5 mr-1" />
+                                    <span className="hidden sm:inline">{user?.username}</span>
+                                </Link>
+                                <button
+                                    onClick={handleLogout}
+                                    className="flex items-center text-gray-600 hover:text-red-600"
+                                >
+                                    <LogOut className="h-5 w-5" />
+                                </button>
+                            </>
+                        ) : (
+                            <>
+                                <Link
+                                    to="/login"
+                                    className="text-gray-600 hover:text-indigo-600 px-3 py-2 text-sm font-medium"
+                                >
+                                    Login
+                                </Link>
+                                <Link
+                                    to="/register"
+                                    className="bg-indigo-600 text-white px-4 py-2 rounded-md text-sm font-medium hover:bg-indigo-700"
+                                >
+                                    Sign Up
+                                </Link>
+                            </>
+                        )}
+                    </div>
+                </div>
+            </div>
+        </nav>
+    );
+};
+export default Navbar;
\ No newline at end of file
--- a/frontend/src/components/common/ProtectedRoute.jsx
+++ b/frontend/src/components/common/ProtectedRoute.jsx
+import { Navigate, useLocation } from 'react-router-dom';
+import { useAuth } from '../../context/ContextUsing';
+import Loading from './Loading';
+const ProtectedRoute = ({ children }) => {
+    const { isAuthenticated, loading } = useAuth();
+    const location = useLocation();
+    if (loading) {
+        return (
+            <div className="min-h-screen flex items-center justify-center">
+                <Loading text="Checking authentication..." />
+            </div>
+        );
+    }
+    if (!isAuthenticated) {
+        return <Navigate to="/login" state={{ from: location }} replace />;
+    }
+    return children;
+};
+export default ProtectedRoute;
\ No newline at end of file
--- a/frontend/src/components/profile/UserProfile.jsx
+++ b/frontend/src/components/profile/UserProfile.jsx
+import { useState, useEffect } from 'react';
+// import { useAuth } from '../../context/AuthContext';
+import { authAPI, progressAPI } from '../../services/api';
+import Loading from '../common/Loading';
+import { User, Mail, Calendar, Award, Target, Clock, TrendingUp } from 'lucide-react';
+const UserProfile = () => {
+    // const { user } = useAuth();
+    const [profile, setProfile] = useState(null);
+    const [progress, setProgress] = useState([]);
+    const [loading, setLoading] = useState(true);
+    useEffect(() => {
+        console.log("loadProfileData");
+        loadProfileData();
+    }, []);
+    const loadProfileData = async () => {
+        try {
+            const [profileRes, progressRes] = await Promise.all([
+                authAPI.getProfile(),
+                progressAPI.getUserProgress({ limit: 10 })
+            ]);
+            setProfile(profileRes.data.data);
+            setProgress(progressRes.data.data);
+        } catch (err) {
+            console.error('Failed to load profile:', err);
+        } finally {
+            setLoading(false);
+        }
+    };
+    if (loading) {
+        return (
+            <div className="min-h-screen flex items-center justify-center">
+                <Loading text="Loading profile..." />
+            </div>
+        );
+    }
+    const stats = profile?.statistics || {};
+    return (
+        <div className="max-w-4xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+            {/* Profile Header */}
+            <div className="bg-white rounded-lg shadow-md p-6 mb-6">
+                <div className="flex items-center space-x-4">
+                    <div className="h-20 w-20 rounded-full bg-indigo-100 flex items-center justify-center">
+                        <User className="h-10 w-10 text-indigo-600" />
+                    </div>
+                    <div>
+                        <h1 className="text-2xl font-bold text-gray-900">{profile?.user?.username}</h1>
+                        <div className="flex items-center text-gray-600 mt-1">
+                            <Mail className="h-4 w-4 mr-2" />
+                            {profile?.user?.email}
+                        </div>
+                        <div className="flex items-center text-gray-500 text-sm mt-1">
+                            <Calendar className="h-4 w-4 mr-2" />
+                            Joined {new Date(profile?.user?.created_at).toLocaleDateString()}
+                        </div>
+                    </div>
+                </div>
+            </div>
+            {/* Statistics */}
+            <div className="grid grid-cols-1 md:grid-cols-4 gap-4 mb-6">
+                <div className="bg-white rounded-lg shadow-md p-4">
+                    <div className="flex items-center justify-between">
+                        <div>
+                            <p className="text-sm text-gray-500">Scenarios</p>
+                            <p className="text-2xl font-bold text-gray-900">{stats.scenarios_attempted || 0}</p>
+                        </div>
+                        <Target className="h-8 w-8 text-indigo-600" />
+                    </div>
+                </div>
+                <div className="bg-white rounded-lg shadow-md p-4">
+                    <div className="flex items-center justify-between">
+                        <div>
+                            <p className="text-sm text-gray-500">Correct</p>
+                            <p className="text-2xl font-bold text-green-600">{stats.correct_answers || 0}</p>
+                        </div>
+                        <Award className="h-8 w-8 text-green-600" />
+                    </div>
+                </div>
+                <div className="bg-white rounded-lg shadow-md p-4">
+                    <div className="flex items-center justify-between">
+                        <div>
+                            <p className="text-sm text-gray-500">Avg Score</p>
+                            <p className="text-2xl font-bold text-gray-900">{stats.average_score || 0}</p>
+                        </div>
+                        <TrendingUp className="h-8 w-8 text-blue-600" />
+                    </div>
+                </div>
+                <div className="bg-white rounded-lg shadow-md p-4">
+                    <div className="flex items-center justify-between">
+                        <div>
+                            <p className="text-sm text-gray-500">Accuracy</p>
+                            <p className="text-2xl font-bold text-purple-600">{stats.accuracy_percentage || 0}%</p>
+                        </div>
+                        <Clock className="h-8 w-8 text-purple-600" />
+                    </div>
+                </div>
+            </div>
+            {/* Recent Progress */}
+            <div className="bg-white rounded-lg shadow-md p-6">
+                <h2 className="text-lg font-semibold text-gray-900 mb-4">Recent Activity</h2>
+                {progress.length === 0 ? (
+                    <p className="text-gray-500 text-center py-8">
+                        No activity yet. Start practicing scenarios!
+                    </p>
+                ) : (
+                    <div className="space-y-4">
+                        {progress.map((item) => (
+                            <div
+                                key={item.id}
+                                className="flex items-center justify-between p-4 bg-gray-50 rounded-lg"
+                            >
+                                <div>
+                                    <h3 className="font-medium text-gray-900">{item.scenario_title}</h3>
+                                    <p className="text-sm text-gray-500">
+                                        {new Date(item.completed_at).toLocaleDateString()} • Attempt #{item.attempt_number}
+                                    </p>
+                                </div>
+                                <div className="flex items-center space-x-4">
+                                    <span className={`px-2 py-1 text-xs font-medium rounded-full ${
+                                        item.is_correct ? 'bg-green-100 text-green-800' : 'bg-red-100 text-red-800'
+                                    }`}>
+                                        {item.is_correct ? 'Correct' : 'Incorrect'}
+                                    </span>
+                                    <span className="text-lg font-bold text-gray-900">{item.score}</span>
+                                </div>
+                            </div>
+                        ))}
+                    </div>
+                )}
+            </div>
+        </div>
+    );
+};
+export default UserProfile;
\ No newline at end of file
--- a/frontend/src/components/scenario/AnswerOptions.jsx
+++ b/frontend/src/components/scenario/AnswerOptions.jsx
+import { useState } from 'react';
+import { CheckCircle, Circle } from 'lucide-react';
+const AnswerOptions = ({ answers, onSelect, disabled, selectedAnswer, correctAnswer, showFeedback }) => {
+    const [hoveredId, setHoveredId] = useState(null);
+    const getOptionStyle = (answer) => {
+        if (!showFeedback) {
+            if (selectedAnswer === answer.answer) {
+                return 'border-indigo-500 bg-indigo-50 ring-2 ring-indigo-500';
+            }
+            if (hoveredId === answer.id && !disabled) {
+                return 'border-gray-300 bg-gray-50';
+            }
+            return 'border-gray-200 hover:border-gray-300';
+        }
+        // Show feedback
+        if (answer.answer === correctAnswer) {
+            return 'border-green-500 bg-green-50 ring-2 ring-green-500';
+        }
+        if (selectedAnswer === answer.answer && answer.answer !== correctAnswer) {
+            return 'border-red-500 bg-red-50 ring-2 ring-red-500';
+        }
+        return 'border-gray-200 opacity-50';
+    };
+    return (
+        <div className="space-y-3">
+            <h3 className="text-lg font-medium text-gray-900 mb-4">Select your answer:</h3>
+            {answers.map((answer) => (
+                <button
+                    key={answer.id}
+                    onClick={() => !disabled && onSelect(answer)}
+                    disabled={disabled}
+                    onMouseEnter={() => setHoveredId(answer.id)}
+                    onMouseLeave={() => setHoveredId(null)}
+                    className={`w-full text-left p-4 rounded-lg border-2 transition-all duration-200 ${getOptionStyle(answer)} ${
+                        disabled ? 'cursor-not-allowed' : 'cursor-pointer'
+                    }`}
+                >
+                    <div className="flex items-start">
+                        <div className="shrink-0 mt-0.5">
+                            {showFeedback && answer.answer === correctAnswer ? (
+                                <CheckCircle className="h-5 w-5 text-green-500" />
+                            ) : selectedAnswer === answer.answer ? (
+                                <CheckCircle className={`h-5 w-5 ${showFeedback ? 'text-red-500' : 'text-indigo-500'}`} />
+                            ) : (
+                                <Circle className="h-5 w-5 text-gray-400" />
+                            )}
+                        </div>
+                        <span className="ml-3 text-gray-900">{answer.answer}</span>
+                    </div>
+                </button>
+            ))}
+        </div>
+    );
+};
+export default AnswerOptions;
\ No newline at end of file
--- a/frontend/src/components/scenario/FeedbackModal.jsx
+++ b/frontend/src/components/scenario/FeedbackModal.jsx
+import { CheckCircle, XCircle, X, ArrowRight } from 'lucide-react';
+const FeedbackModal = ({ isOpen, onClose, feedback, onNext }) => {
+    if (!isOpen || !feedback) return null;
+    const isCorrect = feedback.correct;
+    return (
+        <div className="fixed inset-0 z-50 overflow-y-auto">
+            <div className="flex items-center justify-center min-h-screen px-4 pt-4 pb-20 text-center sm:p-0">
+                {/* Backdrop */}
+                <div 
+                    className="fixed inset-0 transition-opacity bg-gray-500 bg-opacity-75"
+                    onClick={onClose}
+                />
+                {/* Modal */}
+                <div className="relative inline-block w-full max-w-lg p-6 my-8 overflow-hidden text-left align-middle transition-all transform bg-white shadow-xl rounded-2xl">
+                    {/* Close button */}
+                    <button
+                        onClick={onClose}
+                        className="absolute top-4 right-4 text-gray-400 hover:text-gray-600"
+                    >
+                        <X className="h-6 w-6" />
+                    </button>
+                    {/* Header */}
+                    <div className="flex items-center space-x-3 mb-4">
+                        {isCorrect ? (
+                            <CheckCircle className="h-10 w-10 text-green-500" />
+                        ) : (
+                            <XCircle className="h-10 w-10 text-red-500" />
+                        )}
+                        <h3 className={`text-2xl font-bold ${isCorrect ? 'text-green-700' : 'text-red-700'}`}>
+                            {isCorrect ? 'Correct!' : 'Incorrect'}
+                        </h3>
+                    </div>
+                    {/* Content */}
+                    <div className="mt-4 space-y-4">
+                        {!isCorrect && feedback.correctAnswer && (
+                            <div className="p-4 bg-green-50 rounded-lg border border-green-200">
+                                <p className="text-sm font-medium text-green-800">Correct Answer:</p>
+                                <p className="mt-1 text-green-900">{feedback.correctAnswer}</p>
+                            </div>
+                        )}
+                        <div className={`p-4 rounded-lg ${isCorrect ? 'bg-green-50 border border-green-200' : 'bg-gray-50 border border-gray-200'}`}>
+                            <p className={`text-sm font-medium ${isCorrect ? 'text-green-800' : 'text-gray-700'}`}>
+                                {isCorrect ? 'Why this is correct:' : 'Explanation:'}
+                            </p>
+                            <p className={`mt-2 ${isCorrect ? 'text-green-900' : 'text-gray-900'}`}>
+                                {isCorrect ? feedback.rationale : feedback.explanation}
+                            </p>
+                        </div>
+                        {!isCorrect && feedback.rationale && (
+                            <div className="p-4 bg-blue-50 rounded-lg border border-blue-200">
+                                <p className="text-sm font-medium text-blue-800">Why the correct answer works:</p>
+                                <p className="mt-2 text-blue-900">{feedback.rationale}</p>
+                            </div>
+                        )}
+                    </div>
+                    {/* Actions */}
+                    <div className="mt-6 flex justify-end space-x-3">
+                        <button
+                            onClick={onClose}
+                            className="px-4 py-2 text-sm font-medium text-gray-700 bg-gray-100 rounded-md hover:bg-gray-200"
+                        >
+                            Review Scenario
+                        </button>
+                        {onNext && (
+                            <button
+                                onClick={onNext}
+                                className="flex items-center px-4 py-2 text-sm font-medium text-white bg-indigo-600 rounded-md hover:bg-indigo-700"
+                            >
+                                Next Scenario
+                                <ArrowRight className="ml-2 h-4 w-4" />
+                            </button>
+                        )}
+                    </div>
+                </div>
+            </div>
+        </div>
+    );
+};
+export default FeedbackModal;
\ No newline at end of file
--- a/frontend/src/components/scenario/GivensTable.jsx
+++ b/frontend/src/components/scenario/GivensTable.jsx
+const GivensTable = ({ data }) => {
+    if (!data || !data.headers || !data.rows) {
+        return <div className="text-gray-500">No data available</div>;
+    }
+    const formatValue = (value, header) => {
+        if (value === null || value === undefined) return '-';
+        const lowerHeader = header.toLowerCase();
+        if (lowerHeader.includes('price')) {
+            return `$${parseFloat(value).toFixed(2)}`;
+        }
+        if (lowerHeader.includes('z-score') || lowerHeader.includes('z_score')) {
+            const num = parseFloat(value);
+            return (
+                <span className={num > 2 ? 'text-red-600 font-semibold' : num < -2 ? 'text-green-600 font-semibold' : ''}>
+                    {num.toFixed(2)}
+                </span>
+            );
+        }
+        if (lowerHeader.includes('date')) {
+            return new Date(value).toLocaleDateString();
+        }
+        return value;
+    };
+    const getHeaderKey = (header) => {
+        return header.toLowerCase().replace(/[\s-]/g, '_');
+    };
+    return (
+        <div className="overflow-x-auto rounded-lg border border-gray-200">
+            <table className="min-w-full divide-y divide-gray-200">
+                <thead className="bg-gray-50">
+                    <tr>
+                        {data.headers.map((header, idx) => (
+                            <th
+                                key={idx}
+                                className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider"
+                            >
+                                {header}
+                            </th>
+                        ))}
+                    </tr>
+                </thead>
+                <tbody className="bg-white divide-y divide-gray-200">
+                    {data.rows.map((row, rowIdx) => (
+                        <tr key={rowIdx} className="hover:bg-gray-50">
+                            {data.headers.map((header, colIdx) => {
+                                const key = getHeaderKey(header);
+                                const value = row[key] || row[header.toLowerCase()];
+                                return (
+                                    <td
+                                        key={colIdx}
+                                        className="px-4 py-3 text-sm text-gray-900 whitespace-nowrap"
+                                    >
+                                        {formatValue(value, header)}
+                                    </td>
+                                );
+                            })}
+                        </tr>
+                    ))}
+                </tbody>
+            </table>
+        </div>
+    );
+};
+export default GivensTable;
\ No newline at end of file
--- a/frontend/src/components/scenario/ScenarioCard.jsx
+++ b/frontend/src/components/scenario/ScenarioCard.jsx
+import { Link } from 'react-router-dom';
+import { Clock, CheckCircle, ChevronRight, Tag } from 'lucide-react';
+const ScenarioCard = ({ scenario }) => {
+    const difficultyColors = {
+        easy: 'bg-green-100 text-green-800',
+        medium: 'bg-yellow-100 text-yellow-800',
+        hard: 'bg-orange-100 text-orange-800',
+        expert: 'bg-red-100 text-red-800'
+    };
+    return (
+        <Link
+            to={`/scenarios/${scenario.id}`}
+            className="block bg-white rounded-lg shadow-md hover:shadow-lg transition-shadow duration-200 overflow-hidden border border-gray-100"
+        >
+            <div className="p-6">
+                <div className="flex items-start justify-between">
+                    <div className="flex-1">
+                        <div className="flex items-center space-x-2 mb-2">
+                            <span className={`px-2 py-1 text-xs font-medium rounded-full ${difficultyColors[scenario.difficulty_level]}`}>
+                                {scenario.difficulty_level}
+                            </span>
+                            {scenario.category && (
+                                <span className="px-2 py-1 text-xs font-medium rounded-full bg-indigo-100 text-indigo-800">
+                                    {scenario.category}
+                                </span>
+                            )}
+                            {scenario.isCompleted && (
+                                <CheckCircle className="h-5 w-5 text-green-500" />
+                            )}
+                        </div>
+                        <h3 className="text-lg font-semibold text-gray-900 mb-2">
+                            {scenario.title}
+                        </h3>
+                        <p className="text-gray-600 text-sm line-clamp-2">
+                            {scenario.short_description}
+                        </p>
+                    </div>
+                    <ChevronRight className="h-5 w-5 text-gray-400 shrink-0 ml-4" />
+                </div>
+                {scenario.tags && scenario.tags.length > 0 && (
+                    <div className="mt-4 flex items-center flex-wrap gap-2">
+                        <Tag className="h-4 w-4 text-gray-400" />
+                        {scenario.tags.slice(0, 3).map((tag, idx) => (
+                            <span
+                                key={idx}
+                                className="text-xs text-gray-500 bg-gray-100 px-2 py-1 rounded"
+                            >
+                                {tag}
+                            </span>
+                        ))}
+                    </div>
+                )}
+            </div>
+        </Link>
+    );
+};
+export default ScenarioCard;
\ No newline at end of file
--- a/frontend/src/components/scenario/ScenarioDashboard.jsx
+++ b/frontend/src/components/scenario/ScenarioDashboard.jsx
+import { useState, useEffect } from 'react';
+import { scenariosAPI } from '../../services/api';
+import ScenarioCard from './ScenarioCard';
+import Loading from '../common/Loading';
+import Alert from '../common/Alert';
+import { Filter, Search } from 'lucide-react';
+const ScenarioDashboard = () => {
+    const [scenarios, setScenarios] = useState([]);
+    const [categories, setCategories] = useState([]);
+    const [loading, setLoading] = useState(true);
+    const [error, setError] = useState(null);
+    const [filters, setFilters] = useState({
+        category: '',
+        difficulty: '',
+        search: ''
+    });
+    const [pagination, setPagination] = useState({
+        limit: 12,
+        offset: 0,
+        total: 0
+    });
+    useEffect(() => {
+        loadCategories();
+    }, []);
+    useEffect(() => {
+        loadScenarios();
+    }, [filters.category, filters.difficulty, pagination.offset]);
+    const loadCategories = async () => {
+        try {
+            const response = await scenariosAPI.getCategories();
+            setCategories(response.data.data);
+        } catch (err) {
+            console.error('Failed to load categories:', err);
+        }
+    };
+    const loadScenarios = async () => {
+        try {
+            setLoading(true);
+            const response = await scenariosAPI.getAll({
+                limit: pagination.limit,
+                offset: pagination.offset,
+                category: filters.category || undefined,
+                difficulty: filters.difficulty || undefined
+            });
+            setScenarios(response.data.data.scenarios);
+            setPagination(prev => ({
+                ...prev,
+                total: response.data.data.total
+            }));
+        } catch (err) {
+            setError(err.response?.data?.message || 'Failed to load scenarios');
+        } finally {
+            setLoading(false);
+        }
+    };
+    const handleFilterChange = (key, value) => {
+        setFilters(prev => ({ ...prev, [key]: value }));
+        setPagination(prev => ({ ...prev, offset: 0 }));
+    };
+    const filteredScenarios = scenarios.filter(scenario =>
+        scenario.title.toLowerCase().includes(filters.search.toLowerCase()) ||
+        scenario.short_description.toLowerCase().includes(filters.search.toLowerCase())
+    );
+    const totalPages = Math.ceil(pagination.total / pagination.limit);
+    const currentPage = Math.floor(pagination.offset / pagination.limit) + 1;
+    return (
+        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+            <div className="mb-8">
+                <h1 className="text-3xl font-bold text-gray-900">Scenarios</h1>
+                <p className="mt-2 text-gray-600">
+                    Practice your decision-making skills with real-world scenarios
+                </p>
+            </div>
+            {/* Filters */}
+            <div className="mb-6 flex flex-col sm:flex-row gap-4">
+                <div className="flex-1 relative">
+                    <Search className="absolute left-3 top-1/2 transform -translate-y-1/2 h-5 w-5 text-gray-400" />
+                    <input
+                        type="text"
+                        placeholder="Search scenarios..."
+                        value={filters.search}
+                        onChange={(e) => handleFilterChange('search', e.target.value)}
+                        className="w-full pl-10 pr-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-indigo-500 focus:border-transparent"
+                    />
+                </div>
+                <div className="flex gap-4">
+                    <select
+                        value={filters.category}
+                        onChange={(e) => handleFilterChange('category', e.target.value)}
+                        className="px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-indigo-500 focus:border-transparent"
+                    >
+                        <option value="">All Categories</option>
+                        {categories.map(cat => (
+                            <option key={cat} value={cat}>{cat}</option>
+                        ))}
+                    </select>
+                    <select
+                        value={filters.difficulty}
+                        onChange={(e) => handleFilterChange('difficulty', e.target.value)}
+                        className="px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-indigo-500 focus:border-transparent"
+                    >
+                        <option value="">All Difficulties</option>
+                        <option value="easy">Easy</option>
+                        <option value="medium">Medium</option>
+                        <option value="hard">Hard</option>
+                        <option value="expert">Expert</option>
+                    </select>
+                </div>
+            </div>
+            {error && <Alert type="error" message={error} onClose={() => setError(null)} />}
+            {loading ? (
+                <Loading text="Loading scenarios..." />
+            ) : filteredScenarios.length === 0 ? (
+                <div className="text-center py-12">
+                    <Filter className="h-12 w-12 text-gray-400 mx-auto mb-4" />
+                    <h3 className="text-lg font-medium text-gray-900">No scenarios found</h3>
+                    <p className="text-gray-600">Try adjusting your filters</p>
+                </div>
+            ) : (
+                <>
+                    <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
+                        {filteredScenarios.map(scenario => (
+                            <ScenarioCard key={scenario.id} scenario={scenario} />
+                        ))}
+                    </div>
+                    {/* Pagination */}
+                    {totalPages > 1 && (
+                        <div className="mt-8 flex justify-center space-x-2">
+                            <button
+                                onClick={() => setPagination(prev => ({
+                                    ...prev,
+                                    offset: Math.max(0, prev.offset - prev.limit)
+                                }))}
+                                disabled={currentPage === 1}
+                                className="px-4 py-2 border border-gray-300 rounded-md disabled:opacity-50 disabled:cursor-not-allowed hover:bg-gray-50"
+                            >
+                                Previous
+                            </button>
+                            <span className="px-4 py-2 text-gray-600">
+                                Page {currentPage} of {totalPages}
+                            </span>
+                            <button
+                                onClick={() => setPagination(prev => ({
+                                    ...prev,
+                                    offset: prev.offset + prev.limit
+                                }))}
+                                disabled={currentPage === totalPages}
+                                className="px-4 py-2 border border-gray-300 rounded-md disabled:opacity-50 disabled:cursor-not-allowed hover:bg-gray-50"
+                            >
+                                Next
+                            </button>
+                        </div>
+                    )}
+                </>
+            )}
+        </div>
+    );
+};
+export default ScenarioDashboard;
\ No newline at end of file
--- a/frontend/src/components/scenario/ScenarioDetail.jsx
+++ b/frontend/src/components/scenario/ScenarioDetail.jsx
+import { useState, useEffect, useRef } from 'react';
+import { useParams, useNavigate } from 'react-router-dom';
+import { scenariosAPI, progressAPI } from '../../services/api';
+import { useAuth } from '../../context/ContextUsing';
+import GivensTable from './GivensTable';
+import AnswerOptions from './AnswerOptions';
+import FeedbackModal from './FeedbackModal';
+import Loading from '../common/Loading';
+import Alert from '../common/Alert';
+import { ArrowLeft, Clock, Target, BookOpen } from 'lucide-react';
+const ScenarioDetail = () => {
+    const { id } = useParams();
+    const navigate = useNavigate();
+    const { isAuthenticated } = useAuth();
+    const [scenario, setScenario] = useState(null);
+    const [answers, setAnswers] = useState([]);
+    const [loading, setLoading] = useState(true);
+    const [error, setError] = useState(null);
+    const [selectedAnswer, setSelectedAnswer] = useState(null);
+    const [submitting, setSubmitting] = useState(false);
+    const [feedback, setFeedback] = useState(null);
+    const [showFeedback, setShowFeedback] = useState(false);
+    const [timeSpent, setTimeSpent] = useState(0);
+    const timerRef = useRef(null);
+    const startTimeRef = useRef(null);
+    useEffect(() => {
+        loadScenario();
+        startTimeRef.current = Date.now();
+        timerRef.current = setInterval(() => {
+            setTimeSpent(Math.floor((Date.now() - startTimeRef.current) / 1000));
+        }, 1000);
+        return () => {
+            if (timerRef.current) {
+                clearInterval(timerRef.current);
+            }
+        };
+    }, [id]);
+    const loadScenario = async () => {
+        try {
+            setLoading(true);
+            const response = await scenariosAPI.getById(id);
+            setScenario(response.data.data.scenario);
+            setAnswers(response.data.data.answers);
+        } catch (err) {
+            if (err.response?.status === 404) {
+                setError('Scenario not found');
+            } else {
+                setError(err.response?.data?.message || 'Failed to load scenario');
+            }
+        } finally {
+            setLoading(false);
+        }
+    };
+    const handleAnswerSelect = (answer) => {
+        if (showFeedback) return;
+        setSelectedAnswer(answer.answer);
+    };
+    const handleSubmit = async () => {
+        if (!selectedAnswer || !isAuthenticated) {
+            if (!isAuthenticated) {
+                navigate('/login', { state: { from: { pathname: `/scenarios/${id}` } } });
+            }
+            return;
+        }
+        setSubmitting(true);
+        clearInterval(timerRef.current);
+        try {
+            const response = await progressAPI.submit({
+                scenarioId: id,
+                selectedAnswer,
+                timeSpentSeconds: timeSpent
+            });
+            console.log("response.data.data=>",response.data.data)
+            setFeedback(response.data.data.feedback);
+            setShowFeedback(true);
+        } catch (err) {
+            setError(err.response?.data?.message || 'Failed to submit answer');
+        } finally {
+            setSubmitting(false);
+        }
+    };
+    const formatTime = (seconds) => {
+        const mins = Math.floor(seconds / 60);
+        const secs = seconds % 60;
+        return `${mins}:${secs.toString().padStart(2, '0')}`;
+    };
+    const difficultyColors = {
+        easy: 'bg-green-100 text-green-800',
+        medium: 'bg-yellow-100 text-yellow-800',
+        hard: 'bg-orange-100 text-orange-800',
+        expert: 'bg-red-100 text-red-800'
+    };
+    if (loading) {
+        return (
+            <div className="min-h-screen flex items-center justify-center">
+                <Loading text="Loading scenario..." />
+            </div>
+        );
+    }
+    if (error) {
+        return (
+            <div className="max-w-4xl mx-auto px-4 py-8">
+                <Alert type="error" message={error} />
+                <button
+                    onClick={() => navigate('/scenarios')}
+                    className="mt-4 flex items-center text-indigo-600 hover:text-indigo-800"
+                >
+                    <ArrowLeft className="h-4 w-4 mr-2" />
+                    Back to scenarios
+                </button>
+            </div>
+        );
+    }
+    return (
+        <div className="max-w-4xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+            {/* Header */}
+            <div className="mb-6">
+                <button
+                    onClick={() => navigate('/scenarios')}
+                    className="flex items-center text-gray-600 hover:text-gray-900 mb-4"
+                >
+                    <ArrowLeft className="h-4 w-4 mr-2" />
+                    Back to scenarios
+                </button>
+                <div className="flex items-start justify-between">
+                    <div>
+                        <div className="flex items-center space-x-3 mb-2">
+                            {/* <span className="text-sm text-gray-500">{scenario.id}</span> */}
+                            <span className={`px-2 py-1 text-xs font-medium rounded-full ${difficultyColors[scenario.difficultyLevel]}`}>
+                                {scenario.difficultyLevel}
+                            </span>
+                            {scenario.category && (
+                                <span className="px-2 py-1 text-xs font-medium rounded-full bg-indigo-100 text-indigo-800">
+                                    {scenario.category}
+                                </span>
+                            )}
+                        </div>
+                        <h1 className="text-2xl font-bold text-gray-900">{scenario.title}</h1>
+                    </div>
+                    <div className="flex items-center space-x-2 text-gray-600">
+                        <Clock className="h-5 w-5" />
+                        <span className="font-mono text-lg">{formatTime(timeSpent)}</span>
+                    </div>
+                </div>
+            </div>
+            {/* Scenario Content */}
+            <div className="bg-white rounded-lg shadow-md p-6 mb-6">
+                <div className="flex items-center space-x-2 mb-4">
+                    <BookOpen className="h-5 w-5 text-indigo-600" />
+                    <h2 className="text-lg font-semibold text-gray-900">Scenario</h2>
+                </div>
+                <p className="text-gray-700 leading-relaxed">{scenario.scenarioParagraph}</p>
+            </div>
+            {/* Givens Table */}
+            <div className="bg-white rounded-lg shadow-md p-6 mb-6">
+                <div className="flex items-center space-x-2 mb-4">
+                    <Target className="h-5 w-5 text-indigo-600" />
+                    <h2 className="text-lg font-semibold text-gray-900">Market Data</h2>
+                </div>
+                <GivensTable data={scenario.givensTable} />
+            </div>
+            {/* Answer Options */}
+            <div className="bg-white rounded-lg shadow-md p-6 mb-6">
+                <AnswerOptions
+                    answers={answers}
+                    onSelect={handleAnswerSelect}
+                    disabled={showFeedback || submitting}
+                    selectedAnswer={selectedAnswer}
+                    correctAnswer={feedback?.correctAnswer || (feedback?.correct ? selectedAnswer : null)}
+                    showFeedback={showFeedback}
+                />
+                {!showFeedback && (
+                    <div className="mt-6 flex justify-end">
+                        {!isAuthenticated && (
+                            <p className="text-sm text-gray-500 mr-4 self-center">
+                                Please <button onClick={() => navigate('/login')} className="text-indigo-600 hover:underline">login</button> to submit your answer
+                            </p>
+                        )}
+                        <button
+                            onClick={handleSubmit}
+                            disabled={!selectedAnswer || submitting || !isAuthenticated}
+                            className="px-6 py-2 bg-indigo-600 text-white font-medium rounded-lg hover:bg-indigo-700 disabled:opacity-50 disabled:cursor-not-allowed"
+                        >
+                            {submitting ? 'Submitting...' : 'Submit Answer'}
+                        </button>
+                    </div>
+                )}
+            </div>
+            {/* Feedback Modal */}
+            <FeedbackModal
+                isOpen={showFeedback}
+                onClose={() => setShowFeedback(false)}
+                feedback={feedback}
+                onNext={() => navigate('/scenarios')}
+            />
+        </div>
+    );
+};
+export default ScenarioDetail;
\ No newline at end of file
--- a/frontend/src/context/AuthContext.jsx
+++ b/frontend/src/context/AuthContext.jsx
+import { useState, useEffect, useCallback } from 'react';
+import { authAPI } from '../services/api';
+import { AuthContext } from './ContextUsing';
+import { useNavigate } from 'react-router-dom';
+// import 
+export const AuthProvider = ({ children }) => {
+    const [user, setUser] = useState(null);
+    const [loading, setLoading] = useState(true);
+    const [error, setError] = useState(null);
+   const navigate = useNavigate();
+    useEffect(() => {
+        const handleLogout = () => {
+            setUser(null);
+            navigate('/login');
+        };
+        window.addEventListener("force-logout", handleLogout);
+        return () => {
+            window.removeEventListener("force-logout", handleLogout);
+        };
+    }, [navigate]);
+    const loadUser = useCallback(async () => {
+        const token = localStorage.getItem('accessToken');
+        if (!token) {
+            setLoading(false);
+            return;
+        }
+        try {
+            const response = await authAPI.getProfile();
+            console.log("response => ", response);
+            setUser(response.data.data.user);
+        } catch (err) {
+            console.log("err => ", err);
+            localStorage.removeItem('accessToken');
+            localStorage.removeItem('refreshToken');
+        } finally {
+            setLoading(false);
+        }
+    }, []);
+    useEffect(() => {
+        loadUser();
+    }, [loadUser]);
+    const login = async (email, password) => {
+        try {
+            setError(null);
+            const response = await authAPI.login({ email, password });
+            const { user, accessToken, refreshToken } = response.data.data;
+             console.log("refreshToken from UI => ", refreshToken);
+            localStorage.setItem('accessToken', accessToken);
+            localStorage.setItem('refreshToken', refreshToken);
+            setUser(user);
+            return { success: true };
+        } catch (err) {
+            const message = err.response?.data?.message || 'Login failed';
+            setError(message);
+            return { success: false, error: message };
+        }
+    };
+    const register = async (username, email, password) => {
+        try {
+            setError(null);
+            const response = await authAPI.register({ username, email, password });
+            const { user, accessToken, refreshToken } = response.data.data;
+            localStorage.setItem('accessToken', accessToken);
+            localStorage.setItem('refreshToken', refreshToken);
+            setUser(user);
+            return { success: true };
+        } catch (err) {
+            const message = err.response?.data?.message || 'Registration failed';
+            setError(message);
+            return { success: false, error: message };
+        }
+    };
+    const logout = async () => {
+        try {
+            await authAPI.logout();
+        } catch (err) {
+            console.error('Logout error:', err);
+        } finally {
+            localStorage.removeItem('accessToken');
+            localStorage.removeItem('refreshToken');
+            setUser(null);
+        }
+    };
+    const clearError = () => setError(null);
+    return (
+        <AuthContext.Provider value={{
+            user,
+            loading,
+            error,
+            login,
+            register,
+            logout,
+            clearError,
+            isAuthenticated: !!user
+        }}>
+            {children}
+        </AuthContext.Provider>
+    );
+};
--- a/frontend/src/context/ContextUsing.jsx
+++ b/frontend/src/context/ContextUsing.jsx
+import { createContext, useContext} from "react";
+export const AuthContext = createContext(null);
+export const useAuth = () => {
+    const context = useContext(AuthContext);
+    if (!context) {
+        throw new Error('useAuth must be used within an AuthProvider');
+    }
+    return context;
+};
\ No newline at end of file
--- a/frontend/src/hooks/useApi.js
+++ b/frontend/src/hooks/useApi.js
+import { useState, useCallback } from "react";
+export const useApi = (apiFunc) => {
+  const [data, setData] = useState(null);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState(null);
+  const execute = useCallback(
+    async (...args) => {
+      try {
+        setLoading(true);
+        setError(null);
+        const response = await apiFunc(...args);
+        setData(response.data.data);
+        return { success: true, data: response.data.data };
+      } catch (err) {
+        const message = err.response?.data?.message || "An error occurred";
+        setError(message);
+        return { success: false, error: message };
+      } finally {
+        setLoading(false);
+      }
+    },
+    [apiFunc]
+  );
+  return { data, loading, error, execute, setData };
+};
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
+@import "tailwindcss";
+@layer base {
+  body {
+    @apply antialiased;
+  }
+}
+@layer utilities {
+  .line-clamp-2 {
+    display: -webkit-box;
+    -webkit-line-clamp: 2;
+    -webkit-box-orient: vertical;
+    overflow: hidden;
+  }
+}
--- a/frontend/src/main.jsx
+++ b/frontend/src/main.jsx
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import App from './App';
+import './index.css';
+// import { BrowserRouter } from 'react-router-dom';
+ReactDOM.createRoot(document.getElementById('root')).render(
+    <React.StrictMode>
+        {/* <BrowserRouter> */}
+        <App />
+        {/* </BrowserRouter> */}
+    </React.StrictMode>
+);
\ No newline at end of file
--- a/frontend/src/services/api.js
+++ b/frontend/src/services/api.js
+import axios from "axios";
+const API_URL = import.meta.env.VITE_API_URL || "http://localhost:5000/api";
+const api = axios.create({
+  baseURL: API_URL,
+  headers: {
+    "Content-Type": "application/json",
+  },
+});
+// Request interceptor for adding auth token
+api.interceptors.request.use(
+  (config) => {
+    const token = localStorage.getItem("accessToken");
+    if (token) {
+      config.headers.Authorization = `Bearer ${token}`;
+    }
+    return config;
+  },
+  (error) => Promise.reject(error)
+);
+// Response interceptor for handling token refresh
+let isRefreshing = false;
+let failedQueue = [];
+const processQueue = (error, token = null) => {
+  failedQueue.forEach((prom) => {
+    if (error) {
+      prom.reject(error);
+    } else {
+      prom.resolve(token);
+    }
+  });
+  failedQueue = [];
+};
+api.interceptors.response.use(
+  (response) => response,
+  async (error) => {
+    const originalRequest = error.config;
+    if (
+      error.response?.status === 401 &&
+      (error.response?.data?.code === "TOKEN_EXPIRED" ||
+        error.response?.data?.code === " jwt expired") &&
+      !originalRequest._retry
+    ) {
+      if (isRefreshing) {
+        return new Promise((resolve, reject) => {
+          failedQueue.push({ resolve, reject });
+        })
+          .then((token) => {
+            originalRequest.headers.Authorization = `Bearer ${token}`;
+            return api(originalRequest);
+          })
+          .catch((err) => Promise.reject(err));
+      }
+      originalRequest._retry = true;
+      isRefreshing = true;
+      try {
+        const refreshToken = localStorage.getItem("refreshToken");
+        const response = await axios.post(`${API_URL}/auth/refresh-token`, {
+          refreshToken,
+        });
+        const { accessToken, refreshToken: newRefreshToken } =
+          response.data.data;
+        localStorage.setItem("accessToken", accessToken);
+        localStorage.setItem("refreshToken", newRefreshToken);
+        processQueue(null, accessToken);
+        originalRequest.headers.Authorization = `Bearer ${accessToken}`;
+        return api(originalRequest);
+      } catch (refreshError) {
+        if (originalRequest.url.includes("/scenarios")) {
+          console.log(
+            "Refresh failed, but continuing as guest for scenarios..."
+          );
+          localStorage.removeItem("accessToken");
+          localStorage.removeItem("refreshToken");
+          delete originalRequest.headers.Authorization;
+          return api(originalRequest);
+        }
+        processQueue(refreshError, null);
+        localStorage.removeItem("accessToken");
+        localStorage.removeItem("refreshToken");
+        window.dispatchEvent(new Event("force-logout"));
+        return Promise.reject(refreshError);
+      } finally {
+        isRefreshing = false;
+      }
+    }
+    return Promise.reject(error);
+  }
+);
+// Auth API
+export const authAPI = {
+  register: (data) => api.post("/auth/register", data),
+  login: (data) => api.post("/auth/login", data),
+  logout: () => {
+    const refreshToken = localStorage.getItem("refreshToken");
+    return api.post("/auth/logout", { refreshToken });
+  },
+  getProfile: () => api.get("/auth/profile"),
+  refreshToken: (refreshToken) =>
+    api.post("/auth/refresh-token", { refreshToken }),
+};
+// Scenarios API
+export const scenariosAPI = {
+  getAll: (params) => api.get("/scenarios", { params }),
+  getById: (id) => api.get(`/scenarios/${id}`),
+  getCategories: () => api.get("/scenarios/categories"),
+  getStatistics: (id) => api.get(`/scenarios/${id}/statistics`),
+};
+// Progress API
+export const progressAPI = {
+  submit: (data) => api.post("/progress/submit", data),
+  getUserProgress: (params) => api.get("/progress", { params }),
+  getLeaderboard: (limit) =>
+    api.get("/progress/leaderboard", { params: { limit } }),
+};
+export default api;
--- a/frontend/src/styles/index.css
+++ b/frontend/src/styles/index.css
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+@layer base {
+  body {
+    @apply antialiased;
+  }
+}
+@layer utilities {
+  .line-clamp-2 {
+    display: -webkit-box;
+    -webkit-line-clamp: 2;
+    -webkit-box-orient: vertical;
+    overflow: hidden;
+  }
+}
--- a/frontend/tailwind.config.js
+++ b/frontend/tailwind.config.js
+export default {
+  content: ["./index.html", "./src/**/*.{js,ts,jsx,tsx}"],
+  theme: {
+    extend: {},
+  },
+  plugins: [],
+};
--- a/frontend/vite.config.js
+++ b/frontend/vite.config.js
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [react()],
+})