import 'dart:async';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:intl/intl.dart';
import '../models/schedule_item.dart';
import '../services/schedule_service.dart';

class ScheduleListWidget extends StatefulWidget {
  const ScheduleListWidget({super.key});

  @override
  State<ScheduleListWidget> createState() => _ScheduleListWidgetState();
}

class _ScheduleListWidgetState extends State<ScheduleListWidget> {
  Timer? _timer;
  List<ScheduleItem> _schedules = [];
  bool _isLoading = true;
  String? _error;

  @override
  void initState() {
    super.initState();
    _fetchSchedules();
    _startAutoRefresh();
  }

  void _startAutoRefresh() {
    _timer = Timer.periodic(const Duration(seconds: 30), (timer) {
      _fetchSchedules();
    });
  }

  Future<void> _fetchSchedules() async {
    try {
      final data = await Provider.of<ScheduleService>(
        context,
        listen: false,
      ).fetchWeeklySchedules();

      if (mounted) {
        setState(() {
          _schedules = data;
          _isLoading = false;
          _error = null;
        });
      }
    } catch (e) {
      if (mounted) {
        setState(() {
          _error = 'Failed to load schedules';
          _isLoading = false;
        });
      }
    }
  }

  @override
  void dispose() {
    _timer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        color: Theme.of(context).cardTheme.color,
        borderRadius: BorderRadius.circular(16),
      ),
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'Weekly Schedule',
            style: Theme.of(context).textTheme.titleLarge?.copyWith(
                  color: Colors.white,
                  fontWeight: FontWeight.bold,
                ),
          ),
          const SizedBox(height: 12),
          Expanded(
            child: _buildContent(),
          ),
        ],
      ),
    );
  }

  Widget _buildContent() {
    if (_isLoading && _schedules.isEmpty) {
      return const Center(child: CircularProgressIndicator());
    }

    if (_error != null && _schedules.isEmpty) {
      return Center(
        child: Text(
          _error!,
          style: const TextStyle(color: Colors.white54),
        ),
      );
    }

    if (_schedules.isEmpty) {
      return const Center(
        child: Text(
          'No schedules this week',
          style: TextStyle(color: Colors.white54),
        ),
      );
    }

    // Sort by date
    final sortedSchedules = List<ScheduleItem>.from(_schedules);
    sortedSchedules.sort((a, b) => a.startDate.compareTo(b.startDate));

    return ListView.separated(
      itemCount: sortedSchedules.length,
      separatorBuilder: (context, index) =>
          const Divider(color: Colors.white10),
      itemBuilder: (context, index) {
        final item = sortedSchedules[index];
        final timeStr = item.isAllDay
            ? 'All Day'
            : DateFormat('HH:mm').format(item.startDate);

        return ListTile(
          contentPadding: EdgeInsets.zero,
          leading: Container(
            padding: const EdgeInsets.symmetric(
              horizontal: 12,
              vertical: 8,
            ),
            decoration: BoxDecoration(
              color: Colors.white10,
              borderRadius: BorderRadius.circular(8),
            ),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              mainAxisSize: MainAxisSize.min,
              children: [
                Text(
                  DateFormat('d').format(item.startDate),
                  style: const TextStyle(
                    color: Colors.white,
                    fontWeight: FontWeight.bold,
                    fontSize: 18,
                  ),
                ),
                Text(
                  DateFormat('E').format(item.startDate),
                  style: const TextStyle(
                    color: Colors.white70,
                    fontSize: 12,
                  ),
                ),
              ],
            ),
          ),
          title: Text(
            item.title,
            style: const TextStyle(
              color: Colors.white,
              fontWeight: FontWeight.w500,
            ),
          ),
          subtitle: Text(
            timeStr,
            style: const TextStyle(color: Colors.white54),
          ),
        );
      },
    );
  }
}