import 'package:flutter/material.dart';
import 'package:table_calendar/table_calendar.dart';
import 'package:em2rp/utils/colors.dart';
import 'package:em2rp/models/event_model.dart';
import 'package:em2rp/utils/calendar_utils.dart';

class MonthView extends StatelessWidget {
  final DateTime focusedDay;
  final DateTime? selectedDay;
  final CalendarFormat calendarFormat;
  final Function(DateTime, DateTime) onDaySelected;
  final Function(CalendarFormat) onFormatChanged;
  final Function(DateTime) onPageChanged;
  final List<EventModel> events;
  final Function(EventModel) onEventSelected;

  const MonthView({
    super.key,
    required this.focusedDay,
    required this.selectedDay,
    required this.calendarFormat,
    required this.onDaySelected,
    required this.onFormatChanged,
    required this.onPageChanged,
    required this.events,
    required this.onEventSelected,
  });

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final rowHeight = (constraints.maxHeight - 100) / 6;

        return Container(
          height: constraints.maxHeight,
          padding: const EdgeInsets.all(8),
          child: TableCalendar(
            firstDay: DateTime.utc(2020, 1, 1),
            lastDay: DateTime.utc(2030, 12, 31),
            focusedDay: focusedDay,
            calendarFormat: calendarFormat,
            startingDayOfWeek: StartingDayOfWeek.monday,
            locale: 'fr_FR',
            availableCalendarFormats: const {
              CalendarFormat.month: 'Mois',
              CalendarFormat.week: 'Semaine',
            },
            selectedDayPredicate: (day) => isSameDay(selectedDay, day),
            onDaySelected: onDaySelected,
            onFormatChanged: onFormatChanged,
            onPageChanged: onPageChanged,
            calendarStyle: _buildCalendarStyle(),
            rowHeight: rowHeight,
            headerStyle: _buildHeaderStyle(),
            calendarBuilders: _buildCalendarBuilders(),
          ),
        );
      },
    );
  }

  CalendarStyle _buildCalendarStyle() {
    return CalendarStyle(
      defaultDecoration: BoxDecoration(
        border: Border.all(color: Colors.grey.shade300),
        borderRadius: BorderRadius.circular(4),
      ),
      selectedDecoration: BoxDecoration(
        color: AppColors.rouge,
        border: Border.all(color: AppColors.rouge),
        borderRadius: BorderRadius.circular(4),
      ),
      todayDecoration: BoxDecoration(
        color: AppColors.rouge.withAlpha(26),
        border: Border.all(color: AppColors.rouge),
        borderRadius: BorderRadius.circular(4),
      ),
      outsideDecoration: BoxDecoration(
        border: Border.all(color: Colors.grey.shade300),
        borderRadius: BorderRadius.circular(4),
      ),
      outsideDaysVisible: false,
      cellMargin: EdgeInsets.zero,
      cellPadding: EdgeInsets.zero,
    );
  }

  HeaderStyle _buildHeaderStyle() {
    return HeaderStyle(
      formatButtonVisible: true,
      titleCentered: true,
      formatButtonShowsNext: false,
      formatButtonDecoration: BoxDecoration(
        color: AppColors.rouge,
        borderRadius: BorderRadius.circular(16),
      ),
      formatButtonTextStyle: const TextStyle(color: Colors.white),
      leftChevronIcon: const Icon(Icons.chevron_left, color: AppColors.rouge),
      rightChevronIcon: const Icon(Icons.chevron_right, color: AppColors.rouge),
      headerPadding: const EdgeInsets.symmetric(vertical: 8),
      titleTextStyle: const TextStyle(
        fontSize: 18,
        fontWeight: FontWeight.bold,
      ),
    );
  }

  CalendarBuilders _buildCalendarBuilders() {
    return CalendarBuilders(
      dowBuilder: (context, day) {
        return Center(
          child: Text(
            CalendarUtils.getShortDayName(day.weekday),
            style: const TextStyle(
              fontWeight: FontWeight.bold,
            ),
          ),
        );
      },
      defaultBuilder: (context, day, focusedDay) {
        return _buildDayCell(day, false);
      },
      selectedBuilder: (context, day, focusedDay) {
        return _buildDayCell(day, true);
      },
      todayBuilder: (context, day, focusedDay) {
        return _buildDayCell(day, false, isToday: true);
      },
    );
  }

  Widget _buildDayCell(DateTime day, bool isSelected, {bool isToday = false}) {
    final dayEvents = CalendarUtils.getEventsForDay(day, events);
    final textColor =
        isSelected ? Colors.white : (isToday ? AppColors.rouge : null);
    final badgeColor = isSelected ? Colors.white : AppColors.rouge;
    final badgeTextColor = isSelected ? AppColors.rouge : Colors.white;

    BoxDecoration decoration;
    if (isSelected) {
      decoration = BoxDecoration(
        color: AppColors.rouge,
        border: Border.all(color: AppColors.rouge),
        borderRadius: BorderRadius.circular(4),
      );
    } else if (isToday) {
      decoration = BoxDecoration(
        color: AppColors.rouge.withAlpha(26),
        border: Border.all(color: AppColors.rouge),
        borderRadius: BorderRadius.circular(4),
      );
    } else {
      decoration = BoxDecoration(
        color: null,
        border: Border.all(color: Colors.grey.shade300),
        borderRadius: BorderRadius.circular(4),
      );
    }

    return Container(
      margin: const EdgeInsets.all(4),
      decoration: decoration,
      child: Stack(
        children: [
          Positioned(
            top: 4,
            left: 4,
            child: Text(
              day.day.toString(),
              style: TextStyle(color: textColor),
            ),
          ),
          if (dayEvents.isNotEmpty)
            Positioned(
              top: 4,
              right: 4,
              child: Container(
                padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
                decoration: BoxDecoration(
                  color: badgeColor,
                  borderRadius: BorderRadius.circular(10),
                ),
                child: Text(
                  dayEvents.length.toString(),
                  style: TextStyle(
                    color: badgeTextColor,
                    fontSize: 12,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
            ),
          if (dayEvents.isNotEmpty)
            Positioned(
              bottom: 2,
              left: 2,
              right: 2,
              top: 28,
              child: SingleChildScrollView(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: dayEvents
                      .map((event) => _buildEventItem(event, isSelected, day))
                      .toList(),
                ),
              ),
            ),
        ],
      ),
    );
  }

  Widget _buildEventItem(
      EventModel event, bool isSelected, DateTime currentDay) {
    return GestureDetector(
      onTap: () {
        onDaySelected(currentDay, currentDay);
        onEventSelected(event);
      },
      child: Container(
        margin: const EdgeInsets.only(bottom: 2),
        padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
        decoration: BoxDecoration(
          color: isSelected
              ? Colors.white.withAlpha(51)
              : AppColors.rouge.withAlpha(26),
          borderRadius: BorderRadius.circular(4),
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              event.name,
              style: TextStyle(
                fontSize: 12,
                color: isSelected ? Colors.white : AppColors.rouge,
                fontWeight: FontWeight.bold,
              ),
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
            ),
            if (CalendarUtils.isMultiDayEvent(event))
              Text(
                'Jour ${CalendarUtils.calculateDayNumber(event.startDateTime, event.startDateTime)}/${CalendarUtils.calculateTotalDays(event)}',
                style: TextStyle(
                  fontSize: 10,
                  color: isSelected ? Colors.white : AppColors.rouge,
                ),
                maxLines: 1,
              ),
          ],
        ),
      ),
    );
  }
}