import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:intl/intl.dart';
import '../providers/dashboard_providers.dart';
import '../../../widgets/error_view.dart';

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

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final async = ref.watch(notificationsProvider);

    return Scaffold(
      appBar: AppBar(
        title: const Text('Notifications'),
        actions: [
          IconButton(
            icon: const Icon(Icons.done_all),
            tooltip: 'Mark all read',
            onPressed: () async {
              await ref.read(notificationServiceProvider).markAllRead();
              ref.invalidate(notificationsProvider);
              ref.invalidate(unreadCountProvider);
            },
          ),
        ],
      ),
      body: async.when(
        loading: () => const Center(child: CircularProgressIndicator()),
        error: (e, _) => ErrorView(
          message: 'Failed to load notifications',
          onRetry: () => ref.invalidate(notificationsProvider),
        ),
        data: (notifications) {
          if (notifications.isEmpty) {
            return const Center(
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Icon(Icons.notifications_none,
                      size: 64, color: Color(0xFFD1D5DB)),
                  SizedBox(height: 16),
                  Text('No notifications',
                      style: TextStyle(color: Color(0xFF9CA3AF))),
                ],
              ),
            );
          }
          return RefreshIndicator(
            onRefresh: () async => ref.invalidate(notificationsProvider),
            child: ListView.separated(
              itemCount: notifications.length,
              separatorBuilder: (_, _) =>
                  const Divider(height: 1, indent: 72),
              itemBuilder: (_, i) {
                final n = notifications[i];
                return _NotificationTile(
                  notification: n,
                  onRead: () async {
                    if (!n.isRead) {
                      await ref
                          .read(notificationServiceProvider)
                          .markRead(n.id);
                      ref.invalidate(notificationsProvider);
                      ref.invalidate(unreadCountProvider);
                    }
                  },
                );
              },
            ),
          );
        },
      ),
    );
  }
}

class _NotificationTile extends StatelessWidget {
  final dynamic notification;
  final VoidCallback onRead;

  const _NotificationTile(
      {required this.notification, required this.onRead});

  IconData _icon(String type) {
    switch (type) {
      case 'RESERVATION_CREATED':
      case 'RESERVATION_CONFIRMED':
        return Icons.event_available;
      case 'RESERVATION_CANCELLED':
        return Icons.event_busy;
      case 'PAYMENT_RECEIVED':
        return Icons.payments_outlined;
      case 'LICENSE_UPLOADED':
        return Icons.badge_outlined;
      default:
        return Icons.notifications_outlined;
    }
  }

  @override
  Widget build(BuildContext context) {
    final fmt = DateFormat('MMM d, h:mm a');
    final isRead = notification.isRead as bool;
    return InkWell(
      onTap: onRead,
      child: Container(
        color: isRead ? null : const Color(0xFFF0F7FF),
        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Container(
              width: 40,
              height: 40,
              decoration: BoxDecoration(
                color: isRead
                    ? const Color(0xFFF3F4F6)
                    : const Color(0xFFE1EFFE),
                shape: BoxShape.circle,
              ),
              child: Icon(
                _icon(notification.type as String),
                size: 20,
                color: isRead
                    ? const Color(0xFF6B7280)
                    : const Color(0xFF1A56DB),
              ),
            ),
            const SizedBox(width: 12),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    notification.title as String,
                    style: TextStyle(
                      fontWeight:
                          isRead ? FontWeight.normal : FontWeight.w600,
                      fontSize: 14,
                    ),
                  ),
                  const SizedBox(height: 2),
                  Text(
                    notification.body as String,
                    style: const TextStyle(
                        fontSize: 13, color: Color(0xFF6B7280)),
                  ),
                  const SizedBox(height: 4),
                  Text(
                    fmt.format(notification.createdAt as DateTime),
                    style: const TextStyle(
                        fontSize: 11, color: Color(0xFF9CA3AF)),
                  ),
                ],
              ),
            ),
            if (!isRead)
              Container(
                width: 8,
                height: 8,
                margin: const EdgeInsets.only(top: 6),
                decoration: const BoxDecoration(
                  color: Color(0xFF1A56DB),
                  shape: BoxShape.circle,
                ),
              ),
          ],
        ),
      ),
    );
  }
}