import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:table_calendar/table_calendar.dart';
import 'package:supabase_flutter/supabase_flutter.dart';
import 'package:tugas_akhir_supabase/utils/date_formatter.dart';
import 'package:intl/intl.dart';
import 'package:tugas_akhir_supabase/screens/calendar/add_schedule_dialog.dart';
import 'dart:async';
import 'package:tugas_akhir_supabase/utils/app_events.dart';
import 'package:tugas_akhir_supabase/screens/calendar/schedule_list_screen.dart';
import 'package:tugas_akhir_supabase/screens/calendar/field_management_screen.dart';
import 'package:tugas_akhir_supabase/screens/calendar/add_field_bottom_sheet.dart';
import 'package:flutter/services.dart';

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

  @override
  _KalenderTanamScreenState createState() => _KalenderTanamScreenState();
}

class _KalenderTanamScreenState extends State<KalenderTanamScreen> {
  CalendarFormat _calendarFormat = CalendarFormat.month;
  DateTime _focusedDay = DateTime.now();
  DateTime? _selectedDay;
  Map<DateTime, List<dynamic>> _events = {};
  bool _isLoading = true;
  int _activeSchedules = 0;
  int _totalFields = 0;

  @override
  void initState() {
    super.initState();
    _selectedDay = _focusedDay;
    // Hapus kode yang mungkin mengganggu keyboard
    _fetchEvents();
    _fetchScheduleCount();
    _fetchFieldCount();
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    // Hapus kode yang mungkin mengganggu keyboard
  }

  Future<void> _fetchEvents() async {
    if (mounted) {
      setState(() => _isLoading = true);
    }

    try {
      final user = Supabase.instance.client.auth.currentUser;
      if (user == null) {
        if (mounted) {
          setState(() => _isLoading = false);
        }
        return;
      }

      // Perbaiki query dengan menyebutkan relasi yang spesifik
      final response = await Supabase.instance.client
          .from('crop_schedules')
          .select('*, fields:fields!crop_schedules_field_id_fkey(*)')
          .eq('user_id', user.id)
          .order('start_date', ascending: true);

      final schedules = response as List<dynamic>;

      // Convert to event map format
      final eventMap = <DateTime, List<dynamic>>{};

      for (final schedule in schedules) {
        final startDate = DateTime.parse(schedule['start_date']);
        final endDate = DateTime.parse(schedule['end_date']);

        // Generate a list of all dates between start and end
        var currentDate = startDate;
        while (currentDate.isBefore(endDate) ||
            currentDate.isAtSameMomentAs(endDate)) {
          final day = DateTime(
            currentDate.year,
            currentDate.month,
            currentDate.day,
          );

          if (eventMap[day] == null) {
            eventMap[day] = [];
          }

          eventMap[day]!.add(schedule);
          currentDate = currentDate.add(const Duration(days: 1));
        }
      }

      if (mounted) {
        setState(() {
          _events = eventMap;
          _isLoading = false;
        });
      }
    } catch (e) {
      if (mounted) {
        setState(() => _isLoading = false);
        ScaffoldMessenger.of(
          context,
        ).showSnackBar(SnackBar(content: Text('Error: ${e.toString()}')));
      }
    }
  }

  List<dynamic> _getEventsForDay(DateTime day) {
    return _events[DateTime(day.year, day.month, day.day)] ?? [];
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      // Hapus unfocus yang menyebabkan masalah keyboard
      // onTap: () => FocusScope.of(context).unfocus(),
      child: Scaffold(
        resizeToAvoidBottomInset: true,
        appBar: AppBar(
          backgroundColor: const Color(0xFF056839),
          elevation: 0,
          title: Text(
            'Kalender Tanam',
            style: GoogleFonts.poppins(
              fontSize: 18,
              fontWeight: FontWeight.w600,
              color: Colors.white,
            ),
          ),
          automaticallyImplyLeading: false,
          actions: [
            IconButton(
              icon: const Icon(Icons.refresh),
              tooltip: 'Refresh Data',
              onPressed: () {
                setState(() => _isLoading = true);
                _fetchEvents();
                _fetchScheduleCount();
                _fetchFieldCount();
              },
            ),
            IconButton(
              icon: const Icon(Icons.list),
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (_) => const ScheduleListScreen()),
                ).then((_) {
                  _fetchEvents();
                  _fetchScheduleCount();
                  _fetchFieldCount();
                });
              },
            ),
          ],
        ),
        body: SafeArea(
          child: Column(
            children: [
              _buildMonthNavigation(),
              Expanded(
                child: Stack(
                  children: [
                    _buildCalendar(),
                    Positioned(
                      bottom: 0,
                      left: 0,
                      right: 0,
                      child: _buildStatsRow(),
                    ),
                  ],
                ),
              ),
              _buildViewAllButton(),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildMonthNavigation() {
    return Container(
      color: const Color(0xFF056839),
      padding: const EdgeInsets.fromLTRB(12, 8, 12, 8),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          const SizedBox(width: 40),
          Row(
            children: [
              IconButton(
                icon: const Icon(
                  Icons.chevron_left,
                  color: Colors.white,
                  size: 24,
                ),
                onPressed: () {
                  setState(() {
                    _focusedDay = DateTime(
                      _focusedDay.year,
                      _focusedDay.month - 1,
                    );
                  });
                },
              ),
              Text(
                DateFormat('MMMM yyyy').format(_focusedDay),
                style: GoogleFonts.poppins(
                  fontSize: 16,
                  fontWeight: FontWeight.w600,
                  color: Colors.white,
                ),
              ),
              IconButton(
                icon: const Icon(
                  Icons.chevron_right,
                  color: Colors.white,
                  size: 24,
                ),
                onPressed: () {
                  setState(() {
                    _focusedDay = DateTime(
                      _focusedDay.year,
                      _focusedDay.month + 1,
                    );
                  });
                },
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildCalendar() {
    return Container(
      color: Colors.white,
      child: TableCalendar(
        firstDay: DateTime.utc(2020, 1, 1),
        lastDay: DateTime.utc(2030, 12, 31),
        focusedDay: _focusedDay,
        calendarFormat: _calendarFormat,
        eventLoader: _getEventsForDay,
        startingDayOfWeek: StartingDayOfWeek.monday,
        selectedDayPredicate: (day) {
          return isSameDay(_selectedDay, day);
        },
        onDaySelected: (selectedDay, focusedDay) {
          setState(() {
            _selectedDay = selectedDay;
            _focusedDay = focusedDay;
          });
          _showAddScheduleDialog(selectedDay);
        },
        onFormatChanged: (format) {
          if (_calendarFormat != format) {
            setState(() {
              _calendarFormat = format;
            });
          }
        },
        onPageChanged: (focusedDay) {
          setState(() {
            _focusedDay = focusedDay;
          });
        },
        calendarStyle: CalendarStyle(
          markersMaxCount: 1,
          markerSize: 5,
          markerDecoration: const BoxDecoration(
            color: Color(0xFF056839),
            shape: BoxShape.circle,
          ),
          markersAlignment: Alignment.bottomCenter,
          markersAnchor: 0.85,
          canMarkersOverflow: false,
          isTodayHighlighted: true,
          selectedDecoration: const BoxDecoration(
            color: Color(0xFF056839),
            shape: BoxShape.circle,
          ),
          todayDecoration: const BoxDecoration(
            color: Color(0xFF056839),
            shape: BoxShape.circle,
          ),
          weekendTextStyle: const TextStyle(
            color: Colors.red,
            fontSize: 14,
            fontWeight: FontWeight.w500,
          ),
          defaultTextStyle: const TextStyle(
            fontSize: 14,
            fontWeight: FontWeight.w500,
            color: Colors.black87,
          ),
          outsideTextStyle: TextStyle(
            color: Colors.grey[400],
            fontSize: 14,
            fontWeight: FontWeight.w500,
          ),
          selectedTextStyle: const TextStyle(
            color: Colors.white,
            fontSize: 14,
            fontWeight: FontWeight.bold,
          ),
          todayTextStyle: const TextStyle(
            color: Colors.white,
            fontSize: 14,
            fontWeight: FontWeight.bold,
          ),
          cellMargin: EdgeInsets.zero,
          cellPadding: EdgeInsets.zero,
          tableBorder: TableBorder.all(width: 0, color: Colors.transparent),
        ),
        headerVisible: false,
        daysOfWeekStyle: DaysOfWeekStyle(
          weekdayStyle: GoogleFonts.poppins(
            fontSize: 12,
            fontWeight: FontWeight.w600,
            color: Colors.black87,
          ),
          weekendStyle: GoogleFonts.poppins(
            fontSize: 12,
            fontWeight: FontWeight.w600,
            color: Colors.red,
          ),
          decoration: const BoxDecoration(color: Colors.white),
        ),
        daysOfWeekHeight: 32,
        rowHeight: 42,
        sixWeekMonthsEnforced: false,
        shouldFillViewport: false,
        availableCalendarFormats: const {CalendarFormat.month: 'Bulan'},
      ),
    );
  }

  Widget _buildStatsRow() {
    return Container(
      margin: const EdgeInsets.symmetric(horizontal: 8, vertical: 10),
      child: Row(
        children: [
          Expanded(
            child: _buildStatCard(
              icon: Icons.calendar_today,
              iconColor: const Color(0xFF4CAF50),
              backgroundColor: const Color(0xFFE8F5E8),
              value: '$_activeSchedules',
              label: 'Jadwal',
            ),
          ),
          const SizedBox(width: 4),
          Expanded(
            child: _buildStatCard(
              icon: Icons.grid_view,
              iconColor: const Color(0xFF4CAF50),
              backgroundColor: const Color(0xFFE8F5E8),
              value: '$_totalFields',
              label: 'Lahan',
            ),
          ),
          const SizedBox(width: 4),
          Expanded(
            child: _buildStatCard(
              icon: Icons.trending_up,
              iconColor: const Color(0xFF2196F3),
              backgroundColor: const Color(0xFFE3F2FD),
              value: '0',
              label: 'Progress',
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildStatCard({
    required IconData icon,
    required Color iconColor,
    required Color backgroundColor,
    required String value,
    required String label,
    VoidCallback? onTap,
  }) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        height: 125,
        padding: const EdgeInsets.symmetric(vertical: 4, horizontal: 2),
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(10),
          boxShadow: [
            BoxShadow(
              color: Colors.black.withOpacity(0.05),
              blurRadius: 3,
              offset: const Offset(0, 1),
            ),
          ],
        ),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Container(
              width: 24,
              height: 24,
              decoration: BoxDecoration(
                color: backgroundColor,
                shape: BoxShape.circle,
              ),
              child: Icon(icon, color: iconColor, size: 14),
            ),
            const SizedBox(height: 2),
            Text(
              value,
              style: GoogleFonts.poppins(
                fontSize: 20,
                fontWeight: FontWeight.bold,
                color: Colors.black87,
              ),
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
            ),
            Text(
              label,
              style: GoogleFonts.poppins(
                fontSize: 9,
                fontWeight: FontWeight.w400,
                color: Colors.grey[600],
              ),
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildViewAllButton() {
    return Container(
      margin: const EdgeInsets.all(10),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          SizedBox(
            width: double.infinity,
            height: 42,
            child: ElevatedButton.icon(
              onPressed: () {
                Navigator.pushNamed(context, '/schedule-list');
              },
              icon: const Icon(Icons.list_alt, size: 16, color: Colors.white),
              label: Text(
                'Lihat Semua Jadwal Tanam',
                style: GoogleFonts.poppins(
                  fontSize: 13,
                  fontWeight: FontWeight.w600,
                  color: Colors.white,
                ),
              ),
              style: ElevatedButton.styleFrom(
                backgroundColor: const Color(0xFF056839),
                elevation: 0,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(10),
                ),
                padding: const EdgeInsets.symmetric(horizontal: 16),
              ),
            ),
          ),
          const SizedBox(height: 8),
          SizedBox(
            width: double.infinity,
            height: 42,
            child: OutlinedButton.icon(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (_) => const FieldManagementScreen()),
                ).then((_) {
                  _fetchFieldCount();
                });
              },
              icon: const Icon(Icons.grid_view, size: 16),
              label: Text(
                'Kelola Lahan',
                style: GoogleFonts.poppins(
                  fontSize: 13,
                  fontWeight: FontWeight.w600,
                ),
              ),
              style: OutlinedButton.styleFrom(
                foregroundColor: const Color(0xFF056839),
                side: const BorderSide(color: Color(0xFF056839), width: 1.5),
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(10),
                ),
                padding: const EdgeInsets.symmetric(horizontal: 16),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Future<void> _showAddScheduleDialog(DateTime selectedDate) async {
    // Dismiss keyboard before showing dialog
    // Hapus unfocus yang mungkin mengganggu keyboard

    // Show loading indicator first
    showDialog(
      context: context,
      barrierDismissible: false,
      builder: (context) => const Center(child: CircularProgressIndicator()),
    );

    // Fetch existing schedules to avoid conflicts
    List<Map<String, dynamic>> existingSchedules = [];
    try {
      final user = Supabase.instance.client.auth.currentUser;
      if (user != null) {
        final response = await Supabase.instance.client
            .from('crop_schedules')
            .select('id, field_id, plot, start_date, end_date')
            .eq('user_id', user.id)
            .timeout(const Duration(seconds: 10));

        existingSchedules = List<Map<String, dynamic>>.from(response);
      }
    } catch (e) {
      debugPrint('Error fetching existing schedules: $e');
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Gagal memuat jadwal yang ada: ${e.toString()}'),
            backgroundColor: Colors.red,
          ),
        );
      }
    }

    if (!mounted) return;
    Navigator.of(context).pop(); // Close loading indicator

    final result = await showDialog(
      context: context,
      barrierDismissible: true,
      builder: (BuildContext context) {
        return AddScheduleDialog(
          existingSchedules: existingSchedules,
          initialStartDate: selectedDate,
          onScheduleAdded: (newSchedule) {
            AppEventBus().fireScheduleUpdated();
          },
        );
      },
    );

    // Selalu refresh data setelah dialog ditutup
    _fetchEvents();
    _fetchScheduleCount();
    _fetchFieldCount();
  }

  Future<void> _fetchScheduleCount() async {
    final user = Supabase.instance.client.auth.currentUser;
    if (user == null) {
      debugPrint('ERROR: User is null in _fetchScheduleCount');
      return;
    }

    try {
      debugPrint('INFO: Fetching active schedules count');

      // Add timeout handling to prevent freezing
      final completer = Completer<List<dynamic>>();

      // Set a timeout to prevent the app from hanging
      Future.delayed(const Duration(seconds: 8), () {
        if (!completer.isCompleted) {
          completer.completeError(
            TimeoutException('Koneksi timeout saat memuat jumlah jadwal.'),
          );
        }
      });

      // Hapus filter waktu yang mungkin terlalu membatasi
      Supabase.instance.client
          .from('crop_schedules')
          .select()
          .eq('user_id', user.id)
          .eq('status', 'active')
          .then((value) {
            if (!completer.isCompleted) completer.complete(value);
          })
          .catchError((error) {
            if (!completer.isCompleted) completer.completeError(error);
          });

      final response = await completer.future;

      debugPrint('INFO: Schedule count response type: ${response.runtimeType}');
      debugPrint('INFO: Raw schedule count response: $response');

      int count = 0;
      count = response.length;
      debugPrint('INFO: Parsed active schedules count: $count');

      // Log first schedule for debugging if available
      if (response.isNotEmpty) {
        debugPrint('INFO: First active schedule: ${response.first}');
      }

      if (mounted) {
        setState(() {
          _activeSchedules = count;
        });
      }
    } catch (e) {
      debugPrint('ERROR: Error fetching active schedules: $e');
      // Continue silently for count errors - they're not critical
    }
  }

  Future<void> _fetchFieldCount() async {
    final user = Supabase.instance.client.auth.currentUser;
    if (user == null) {
      debugPrint('ERROR: User is null in _fetchFieldCount');
      return;
    }

    try {
      debugPrint('INFO: Fetching fields count');

      // Add timeout handling to prevent freezing
      final completer = Completer<List<dynamic>>();

      // Set a timeout to prevent the app from hanging
      Future.delayed(const Duration(seconds: 8), () {
        if (!completer.isCompleted) {
          completer.completeError(
            TimeoutException('Koneksi timeout saat memuat jumlah lahan.'),
          );
        }
      });

      // Fetch all fields for this user
      Supabase.instance.client
          .from('fields')
          .select()
          .eq('user_id', user.id)
          .then((value) {
            if (!completer.isCompleted) completer.complete(value);
          })
          .catchError((error) {
            if (!completer.isCompleted) completer.completeError(error);
          });

      final response = await completer.future;

      debugPrint('INFO: Fields count response type: ${response.runtimeType}');
      debugPrint('INFO: Raw fields count response: $response');

      int count = 0;
      count = response.length;
      debugPrint('INFO: Parsed fields count: $count');

      // Log first field for debugging if available
      if (response.isNotEmpty) {
        debugPrint('INFO: First field: ${response.first}');
      }

      if (mounted) {
        setState(() {
          _totalFields = count;
        });
      }
    } catch (e) {
      debugPrint('ERROR: Error fetching fields count: $e');
      // Continue silently for count errors - they're not critical
    }
  }

  Future<void> _fetchSchedules() async {
    if (mounted) {
      setState(() => _isLoading = true);
    }

    await _fetchEvents();

    if (mounted) {
      setState(() => _isLoading = false);
    }
  }

  // Add this method to show exit confirmation dialog
  Future<void> _showExitConfirmationDialog() async {
    return showDialog<void>(
      context: context,
      barrierDismissible: false,
      builder: (BuildContext context) {
        return AlertDialog(
          title: const Text('Konfirmasi'),
          content: const Text('Apakah Anda yakin ingin keluar dari aplikasi?'),
          actions: <Widget>[
            TextButton(
              child: const Text('Batal'),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
            TextButton(
              child: const Text('Keluar'),
              onPressed: () {
                Navigator.of(context).pop();
                SystemNavigator.pop();
              },
            ),
          ],
        );
      },
    );
  }
}