import 'dart:math';

import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:intl/intl.dart';

class CalendarWidget extends StatefulWidget {
  final DateTime currentDate;

  CalendarWidget({Key? key, required this.currentDate}) : super(key: key);

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

class _CalendarWidgetState extends State<CalendarWidget> {
  late List<DateTime> dateList;

  @override
  void initState() {
    super.initState();
    dateList = _generateDateList(widget.currentDate);
  }

  List<DateTime> _generateDateList(DateTime date) {
    List<DateTime> list = [];
    DateTime firstOfMonth = DateTime(date.year, date.month, 1);
    int dayOfWeek = firstOfMonth.weekday;

    // Adjust to Monday start
    int startDay = dayOfWeek - 1;
    if (startDay < 0) startDay = 6;

    // Dates from previous month
    for (int i = startDay; i > 0; i--) {
      list.add(firstOfMonth.subtract(Duration(days: i)));
    }

    // Dates of current month
    int daysInMonth = DateUtils.getDaysInMonth(date.year, date.month);
    for (int i = 0; i < daysInMonth; i++) {
      list.add(DateTime(date.year, date.month, i + 1));
    }

    // Adjust list to end with a complete week
    while (list.length % 7 != 0) {
      list.add(list.last.add(Duration(days: 1)));
    }

    return list;
  }

  @override
  Widget build(BuildContext context) {
    print(dateList.length);
    double addon = dateList.length > 35 ? 20 : 0;
    return Container(
      height: 300 + addon,
      child: Padding(
        padding: const EdgeInsets.fromLTRB(25, 0, 25, 0),
        child: GridView.builder(
          physics:
              NeverScrollableScrollPhysics(), // Disable scrolling for GridView

          gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 7,
          ),
          itemBuilder: (context, index) {
            DateTime date = dateList[index];
            bool isCurrentMonth = date.month == widget.currentDate.month;
            double outerRadius = 25; // Fixed outer radius
            double innerRadius = Random().nextDouble() * outerRadius;
            double opacity = isCurrentMonth ? 1.0 : 0.15;

            return Center(
              child: GestureDetector(
                onTap: () => {
                  context.go('/entry', extra: date)
                }, // Using the callback here
                child: Container(
                  width: outerRadius * 2,
                  height: outerRadius * 2,
                  decoration: BoxDecoration(
                    shape: BoxShape.circle,
                    border: Border.all(color: Colors.black, width: 2),
                    color: isCurrentMonth
                        ? Colors.transparent
                        : Colors.grey.withOpacity(opacity),
                  ),
                  child: Stack(
                    alignment: Alignment.center,
                    children: [
                      CircleWidget(
                          radius: innerRadius,
                          color: Colors.lightGreenAccent.withOpacity(0.75)),
                      Text(
                        DateFormat("d").format(date),
                        style: TextStyle(color: Colors.black),
                      ),
                    ],
                  ),
                ),
              ),
            );
          },
          itemCount: dateList.length,
        ),
      ),
    );
  }
}

class CircleWidget extends StatelessWidget {
  final double radius;
  final Color color;

  CircleWidget({Key? key, required this.radius, required this.color})
      : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      width: radius * 2,
      height: radius * 2,
      decoration: BoxDecoration(
        shape: BoxShape.circle,
        color: color,
      ),
    );
  }
}