import 'package:flutter/material.dart';
import 'package:lszlgl/base/base_lifecycle_state.dart';
import 'package:lszlgl/widget/button.dart';

import '../config/colors.dart';
import 'card_item.dart';

/// 弹出菜单选项弹框
/// * [list] 选项列表数据源
/// * [title] 标题
/// * [multiple] 多选,默认单选
/// * [selectCountMax] 最大选择数量
/// * [backgroundColor] 背景颜色
/// * [borderRadius] 圆角
/// * [constraints] 尺寸约束
/// * [isScrollControlled] 高度自适应, 默认true
/// * [isDismissible] 点击空白处关闭
/// * [enableDrag] 拖动关闭
Future<T?> showMenuDialog<T>(
  List<CardMenuData>? list, {
  String? title,
  bool multiple = false,
  int? selectCountMax,
  Color? backgroundColor = Colors.white,
  BorderRadiusGeometry? borderRadius,
  BoxConstraints? constraints,
  bool isScrollControlled = true,
  bool isDismissible = true,
  bool enableDrag = true,
}) {
  return showModalBottomSheet(
    context: MyNavigator.navigator.currentState!.context,
    constraints: constraints,
    isScrollControlled: isScrollControlled,
    isDismissible: isDismissible,
    enableDrag: enableDrag,
    useSafeArea: true,
    builder: (_) => MenuDialog(
      list: list,
      title: title,
      multiple: multiple,
      selectCountMax: selectCountMax,
      backgroundColor: backgroundColor,
    ),
  );
}

class MenuDialog extends StatelessWidget {
  final List<CardMenuData> list;
  final String? title;
  final bool multiple;
  final int? selectCountMax;
  final Color? backgroundColor;
  final BorderRadiusGeometry? borderRadius;
  final ValueNotifier<int> selectCount;

  MenuDialog({
    super.key,
    List<CardMenuData>? list,
    this.title,
    required this.multiple,
    this.selectCountMax,
    this.backgroundColor,
    this.borderRadius,
  })  : list = list ?? [],
        selectCount = (list ?? []).where((e) => e.select).length.notifier<int>();

  void onEnterClick() {
    if (list.isEmpty) return;
    List<CardMenuData> selectList = list.where((item) => item.select).toList();
    MyNavigator.pop(selectList);
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        color: backgroundColor,
        borderRadius: borderRadius ?? const BorderRadius.only(topLeft: Radius.circular(16), topRight: Radius.circular(16)),
      ),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          buildTitle(),
          buildList(),
          buildButton(),
          const SizedBox(width: double.infinity, height: 24),
        ],
      ),
    );
  }

  Widget buildTitle() {
    return Padding(
      padding: const EdgeInsets.only(left: 24, top: 16, bottom: 16, right: 24),
      child: Row(
        children: [
          Expanded(
            child: Text(
              '请选择${title ?? ''}：',
              style: const TextStyle(color: Color(0xFF333333), fontSize: 16, fontWeight: FontWeight.w500),
            ),
          ),
          MyButton('关闭', alignment: null, onTap: () => MyNavigator.pop()),
        ],
      ),
    );
  }

  Widget buildList() {
    if (list.isEmpty) {
      return Container(
        alignment: Alignment.center,
        padding: const EdgeInsets.symmetric(vertical: 24),
        child: const Text(
          '没有选项数据',
          style: TextStyle(fontSize: 16, color: MyColor.c_666666),
        ),
      );
    }
    return Flexible(
      child: SingleChildScrollView(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: List.generate(list.length, buildItem).toList(),
        ),
      ),
    );
  }

  Widget buildItem(int index) {
    var item = list[index];
    return StatefulBuilder(builder: (_, setState) {
      return GestureDetector(
        behavior: HitTestBehavior.opaque,
        onTap: () {
          if (multiple) {
            if (!item.select && selectCountMax != null && selectCountMax == selectCount.value) {
              MyNavigator.showToast('选中不能超过$selectCountMax个');
              return;
            }
            item.select = !item.select;
            setState(() {});
          } else {
            // 取消之前选择
            for (var value in list) {
              if (value.select) {
                value.select = false;
                break;
              }
            }
            // 选中当前项
            item.select = true;
            onEnterClick();
          }
        },
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Container(
              padding: const EdgeInsets.symmetric(vertical: 8, horizontal: 16),
              alignment: Alignment.center,
              color: Colors.white,
              child: Text(
                item.name ?? '',
                style: TextStyle(
                  color: item.select ? const Color(0xFF01B2C8) : MyColor.c_666666,
                  fontSize: 14,
                  fontWeight: FontWeight.w500,
                ),
              ),
            ),
            index < list.length - 1
                ? const Divider(
                    color: Color(0xFFF3F3F3),
                    height: 0,
                    thickness: 1,
                    indent: 16,
                    endIndent: 16,
                  )
                : const SizedBox.shrink(),
          ],
        ),
      );
    });
  }

  Widget buildButton() {
    if (!multiple || list.isEmpty) return const SizedBox.shrink();
    return Padding(
      padding: const EdgeInsets.only(top: 16),
      child: Row(
        children: [
          const Spacer(),
          Expanded(flex: 2, child: MyButton('确认', onTap: onEnterClick)),
          const Spacer(),
        ],
      ),
    );
  }
}