import 'package:flutter/material.dart';
import 'package:flutter_animate/flutter_animate.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../core/api/api_service.dart';
import '../../core/auth/auth_store.dart';
import '../../core/l10n/app_localizations.dart';
import '../../core/theme/app_theme.dart';
import '../../core/widgets/loading_overlay.dart';

final eventsProvider = FutureProvider.autoDispose<Map<String, dynamic>>((ref) async {
  return ref.watch(apiServiceProvider).getEvents();
});

class EventsScreen extends ConsumerWidget {
  const EventsScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l = AppLocalizations.of(context);
    final events = ref.watch(eventsProvider);

    return Scaffold(
      backgroundColor: const Color(0xFFF8FAFC),
      appBar: AppBar(
        title: Text(l.t('events')),
        centerTitle: true,
        backgroundColor: Colors.white,
        surfaceTintColor: Colors.transparent,
      ),
      body: RefreshIndicator(
        onRefresh: () async => ref.invalidate(eventsProvider),
        child: events.when(
          loading: () => const Center(child: CircularProgressIndicator()),
          error: (e, _) => Center(child: Text(l.t('error_occurred'))),
          data: (data) {
            final items = (data['data'] as List?) ?? [];
            if (items.isEmpty) {
              return EmptyState(icon: Icons.event, message: l.t('no_events'));
            }
            return ListView.builder(
              physics: const AlwaysScrollableScrollPhysics(parent: BouncingScrollPhysics()),
              padding: const EdgeInsets.all(16),
              itemCount: items.length,
              itemBuilder: (ctx, i) {
                final event = items[i] as Map<String, dynamic>;
                return _EventCard(event: event, index: i, ref: ref);
              },
            );
          },
        ),
      ),
    );
  }
}

class _EventCard extends StatelessWidget {
  final Map<String, dynamic> event;
  final int index;
  final WidgetRef ref;

  const _EventCard({required this.event, required this.index, required this.ref});

  @override
  Widget build(BuildContext context) {
    final isRegistered = event['is_registered'] == true;

    return Container(
      margin: const EdgeInsets.only(bottom: 14),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(18),
        boxShadow: [
          BoxShadow(color: Colors.black.withValues(alpha: 0.04), blurRadius: 12, offset: const Offset(0, 3)),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Image header
          Container(
            height: 140,
            decoration: BoxDecoration(
              color: AppTheme.primaryColor.withValues(alpha: 0.08),
              borderRadius: const BorderRadius.vertical(top: Radius.circular(18)),
            ),
            child: (event['cover_url'] ?? event['image_url']) != null
                ? ClipRRect(
                    borderRadius: const BorderRadius.vertical(top: Radius.circular(18)),
                    child: Image.network(
                      event['cover_url'] ?? event['image_url'],
                      width: double.infinity,
                      fit: BoxFit.cover,
                      errorBuilder: (_, __, ___) => Center(
                        child: Icon(Icons.event, size: 48, color: AppTheme.primaryColor.withValues(alpha: 0.3)),
                      ),
                    ),
                  )
                : Center(
                    child: Icon(Icons.event, size: 48, color: AppTheme.primaryColor.withValues(alpha: 0.3)),
                  ),
          ),
          Padding(
            padding: const EdgeInsets.all(16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  event['title'] ?? '',
                  style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
                ),
                const SizedBox(height: 8),
                Row(
                  children: [
                    Icon(Icons.calendar_today, size: 14, color: Colors.grey.shade500),
                    const SizedBox(width: 6),
                    Text(
                      event['date'] ?? '',
                      style: TextStyle(fontSize: 13, color: Colors.grey.shade500),
                    ),
                    const SizedBox(width: 16),
                    Icon(Icons.access_time, size: 14, color: Colors.grey.shade500),
                    const SizedBox(width: 6),
                    Text(
                      event['time'] ?? '',
                      style: TextStyle(fontSize: 13, color: Colors.grey.shade500),
                    ),
                  ],
                ),
                if (event['location'] != null) ...[
                  const SizedBox(height: 6),
                  Row(
                    children: [
                      Icon(Icons.location_on, size: 14, color: Colors.grey.shade500),
                      const SizedBox(width: 6),
                      Text(
                        event['location'],
                        style: TextStyle(fontSize: 13, color: Colors.grey.shade500),
                      ),
                    ],
                  ),
                ],
                const SizedBox(height: 14),
                SizedBox(
                  width: double.infinity,
                  height: 42,
                  child: ElevatedButton(
                    onPressed: isRegistered
                        ? null
                        : () async {
                            final participants = ref.read(authStoreProvider).participants;
                            if (participants.isEmpty) {
                              if (context.mounted) {
                                ScaffoldMessenger.of(context).showSnackBar(
                                  const SnackBar(content: Text('لا يوجد مشتركين مربوطين بحسابك')),
                                );
                              }
                              return;
                            }
                            try {
                              await ref.read(apiServiceProvider).registerForEvent(
                                    event['uuid'],
                                    participants.first['uuid'] ?? '',
                                  );
                              ref.invalidate(eventsProvider);
                              if (context.mounted) {
                                ScaffoldMessenger.of(context).showSnackBar(
                                  const SnackBar(content: Text('تم التسجيل بنجاح')),
                                );
                              }
                            } catch (_) {
                              if (context.mounted) {
                                ScaffoldMessenger.of(context).showSnackBar(
                                  const SnackBar(content: Text('حدث خطأ أثناء التسجيل')),
                                );
                              }
                            }
                          },
                    style: ElevatedButton.styleFrom(
                      backgroundColor: isRegistered ? Colors.grey.shade200 : AppTheme.primaryColor,
                      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                    ),
                    child: Text(
                      isRegistered ? 'مسجل ✓' : 'سجل الآن',
                      style: TextStyle(
                        fontSize: 14,
                        color: isRegistered ? Colors.grey.shade600 : Colors.white,
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    )
        .animate(delay: Duration(milliseconds: 100 * index))
        .fadeIn(duration: 500.ms)
        .slideY(begin: 0.05, end: 0, curve: Curves.easeOutCubic);
  }
}
