import 'package:carousel_slider/carousel_slider.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:hoshan/ui/theme/colors.dart';
import 'package:hoshan/ui/theme/cubit/theme_mode_cubit.dart';
import 'package:hoshan/ui/theme/text.dart';
import 'package:hoshan/ui/widgets/components/dropdown/simple_dropdown.dart';
import 'package:shamsi_date/shamsi_date.dart';

class PersianDatePicker extends StatefulWidget {
  final double dateHeight;
  final Function(List<Jalali>)? onDates;
  final Function(List<Jalali>)? onConfirm;
  final Function()? onDismise;
  final bool hasConfirm;
  final bool weekSelect;
  final int? dateCounts;
  final List<Jalali>? selectedDates;
  const PersianDatePicker({
    super.key,
    this.dateHeight = 32,
    this.onDates,
    this.dateCounts,
    this.onConfirm,
    this.hasConfirm = true,
    this.onDismise,
    this.selectedDates,
    this.weekSelect = false,
  });

  @override
  State<PersianDatePicker> createState() => _PersianDatePickerState();
}

class _PersianDatePickerState extends State<PersianDatePicker> {
  final Jalali initialDate = Jalali.now();
  final Jalali startDate = Jalali(1390);
  late int persianMonthIndex = initialDate.month;
  late String persianYearSelected = initialDate.year.toString();
  final CarouselSliderControllerImpl controllerImpl =
      CarouselSliderControllerImpl();

  late final List<Jalali> selectedDates = widget.selectedDates ?? [];

  List<String> persianMonths = [
    "فروردین",
    "اردیبهشت",
    "خرداد",
    "تیر",
    "مرداد",
    "شهریور",
    "مهر",
    "آبان",
    "آذر",
    "دی",
    "بهمن",
    "اسفند"
  ];

  List<String> daysOfWeek = [
    "شنبه",
    "یک شنبه",
    "دو شنبه",
    "سه شنبه",
    "چهار شنبه",
    "پنج شنبه",
    "جمعه"
  ];

  List<int> days = [];
  List<int> getDaysOfMonth() {
    final List<int> days = [];
    final date = Jalali(int.parse(persianYearSelected), persianMonthIndex);
    int monthLength = date.monthLength;
    final day = Jalali(int.parse(persianYearSelected), persianMonthIndex, 1);
    int index = daysOfWeek.indexOf(day.formatter.wN);
    for (var i = 0; i < index; i++) {
      days.add(0);
    }
    for (var i = 1; i <= monthLength; i++) {
      days.add(i);
    }
    this.days = days;
    return days;
  }

  List<String> years = [];

  @override
  void initState() {
    super.initState();
    for (var i = 0; i <= initialDate.year - startDate.year; i++) {
      years.add((startDate.year + i).toString());
    }
    years = years.reversed.toList();
  }

  @override
  Widget build(BuildContext context) {
    return Directionality(
      textDirection: TextDirection.rtl,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'انتخاب تاریخ',
            style: AppTextStyles.body4.copyWith(
                fontWeight: FontWeight.bold,
                color: Theme.of(context).colorScheme.onSurface),
          ),
          const SizedBox(
            height: 8,
          ),
          Text(
            'تاریخ روز: ${initialDate.day} ${persianMonths[initialDate.month - 1]} ${initialDate.year}',
            style: AppTextStyles.body4.copyWith(
                color: AppColors
                    .gray[context.read<ThemeModeCubit>().isDark() ? 600 : 900]),
          ),
          const SizedBox(
            height: 16,
          ),
          Row(
            children: [
              Expanded(
                child: SimpleDropdown(
                  initialItem: years.first,
                  list: years,
                  onSelect: (selected) {
                    setState(() {
                      persianYearSelected = years[selected];
                    });
                  },
                ),
              ),
              const SizedBox(
                width: 12,
              ),
              Expanded(
                child: SimpleDropdown(
                  initialItem: persianMonths[persianMonthIndex - 1],
                  list: persianMonths,
                  onSelect: (selected) {
                    controllerImpl
                        .animateToPage(selected)
                        .then((value) => setState(() {
                              persianMonthIndex = selected + 1;
                            }));
                  },
                ),
              ),
            ],
          ),
          GridView.builder(
            shrinkWrap: true,
            itemCount: daysOfWeek.length,
            gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
                crossAxisCount: 7, crossAxisSpacing: 16, mainAxisSpacing: 16),
            itemBuilder: (context, index) {
              return Container(
                alignment: Alignment.center,
                child: Text(
                  daysOfWeek[index].split(' ').first,
                  style: AppTextStyles.body5,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                ),
              );
            },
          ),
          CarouselSlider.builder(
            carouselController: controllerImpl,
            itemBuilder: (context, index, realIndex) {
              return GridView.builder(
                shrinkWrap: true,
                itemCount: getDaysOfMonth().length,
                gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                    crossAxisCount: 7,
                    crossAxisSpacing: 8,
                    mainAxisSpacing: 8,
                    mainAxisExtent: widget.dateHeight),
                itemBuilder: (context, index) {
                  return days[index] == 0
                      ? const SizedBox()
                      : GestureDetector(
                          onTap: () {
                            setState(() {
                              final date = Jalali(
                                  int.parse(persianYearSelected),
                                  persianMonthIndex,
                                  days[index]);
                              if (date > Jalali.now()) return;

                              if (widget.weekSelect) {
                                if (selectedDates.isEmpty) {
                                  selectedDates.add(date);
                                } else if (selectedDates.length == 7) {
                                  selectedDates.clear();
                                  selectedDates.add(date);
                                } else {
                                  final today = Jalali.now();
                                  if (date == selectedDates.first) {
                                    selectedDates.remove(date);
                                  } else if (date > selectedDates.first) {
                                    if (selectedDates.first.addDays(6) <=
                                        today) {
                                      for (int i = 1; i <= 6; i++) {
                                        selectedDates.add(
                                            selectedDates.first.addDays(i));
                                      }
                                    }
                                  } else {
                                    for (int i = 1; i <= 6; i++) {
                                      selectedDates
                                          .add(selectedDates.first.addDays(-i));
                                    }
                                  }
                                }
                              } else {
                                if (selectedDates.contains(date)) {
                                  selectedDates.remove(date);
                                } else {
                                  if (widget.dateCounts != null &&
                                      selectedDates.length ==
                                          widget.dateCounts) {
                                    if (selectedDates.length == 1 &&
                                        widget.dateCounts == 1) {
                                      selectedDates.clear();
                                      selectedDates.add(date);
                                    }
                                    return;
                                  }
                                  selectedDates.add(date);
                                }
                              }
                            });
                          },
                          child: Container(
                            width: widget.dateHeight,
                            height: widget.dateHeight,
                            alignment: Alignment.center,
                            decoration: BoxDecoration(
                                shape: BoxShape.circle,
                                border:
                                    persianMonthIndex == (initialDate.month) &&
                                            (days[index]) == initialDate.day &&
                                            (selectedDates.contains(Jalali(
                                                int.parse(persianYearSelected),
                                                persianMonthIndex,
                                                days[index])))
                                        ? Border.all(
                                            width: 2,
                                            color: Theme.of(context)
                                                .colorScheme
                                                .secondary)
                                        : null,
                                color: persianMonthIndex ==
                                            (initialDate.month) &&
                                        (days[index]) == initialDate.day
                                    ? context.read<ThemeModeCubit>().isDark()
                                        ? Theme.of(context)
                                            .colorScheme
                                            .onSurface
                                            .withAlpha(80)
                                        : AppColors.primaryColor[50]
                                    : selectedDates.contains(Jalali(
                                            int.parse(persianYearSelected),
                                            persianMonthIndex,
                                            days[index]))
                                        ? Theme.of(context)
                                            .colorScheme
                                            .secondary
                                        : null),
                            child: Text(
                              '${days[index]}',
                              style: AppTextStyles.body5.copyWith(
                                  color: selectedDates.contains(Jalali(
                                              int.parse(persianYearSelected),
                                              persianMonthIndex,
                                              days[index])) &&
                                          !(persianMonthIndex ==
                                                  (initialDate.month) &&
                                              (days[index]) == initialDate.day)
                                      ? Colors.white
                                      : Theme.of(context)
                                          .colorScheme
                                          .onSurface),
                            ),
                          ),
                        );
                },
              );
            },
            itemCount: persianMonths.length,
            options: CarouselOptions(
              viewportFraction: 1,
              initialPage: persianMonthIndex - 1,
              disableCenter: false,
              enableInfiniteScroll: true,
              reverse: false,
              autoPlay: false,
              autoPlayCurve: Curves.fastOutSlowIn,
              enlargeCenterPage: true,
              enlargeFactor: 0.3,
              height: 6 * widget.dateHeight + 16,
              onPageChanged: (index, reason) {
                setState(() {
                  if (reason == CarouselPageChangedReason.manual) {
                    persianMonthIndex = index + 1;
                  }
                });
              },
              scrollDirection: Axis.horizontal,
            ),
          ),
          if (widget.hasConfirm)
            Column(
              children: [
                Divider(
                  color: AppColors.gray.defaultShade,
                ),
                Padding(
                  padding:
                      const EdgeInsets.symmetric(vertical: 8, horizontal: 12),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.end,
                    children: [
                      GestureDetector(
                        onTap: () {
                          widget.onDismise?.call();
                        },
                        child: Text(
                          'انصراف',
                          style: AppTextStyles.body4.copyWith(
                              color: AppColors.gray[
                                  context.read<ThemeModeCubit>().isDark()
                                      ? 600
                                      : 900]),
                        ),
                      ),
                      const SizedBox(
                        width: 24,
                      ),
                      GestureDetector(
                        onTap: () {
                          widget.onConfirm?.call(selectedDates);
                        },
                        child: Text(
                          'تایید',
                          style: AppTextStyles.body4.copyWith(
                              color: Theme.of(context).colorScheme.primary),
                        ),
                      ),
                    ],
                  ),
                )
              ],
            ),
        ],
      ),
    );
  }
}