import 'package:flutter/material.dart';

class ApplicationPage extends StatelessWidget {
  const ApplicationPage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final List<Map<String, dynamic>> buttonInfos = [
      {
        'title': '隐患排查',
        'list': [
          {'icon': 'assets/icon-apps/icon-zl-6.png', 'title': '隐患排查', 'num': 0},
          {'icon': 'assets/icon-apps/icon-pc-1.png', 'title': '隐患快报', 'num': 2},
          {'icon': 'assets/icon-apps/icon-zl-2.png', 'title': '检查记录', 'num': 0},
        ],
      },
      {
        'title': '隐患治理',
        'list': [
          {'icon': 'assets/icon-apps/icon-zl-2.png', 'title': '隐患记录', 'num': 1},
          {
            'icon': 'assets/icon-apps/icon-zl-3.png',
            'title': '待整改隐患',
            'num': 3,
          },
          {
            'icon': 'assets/icon-apps/icon-zl-4.png',
            'title': '超期未整改',
            'num': 0,
          },
          {'icon': 'assets/icon-apps/icon-yh-1.png', 'title': '隐患验收', 'num': 2},
          {
            'icon': 'assets/icon-apps/icon-zl-1.png',
            'title': '已验收隐患',
            'num': 0,
          },
        ],
      },
      {
        'title': '专项检查',
        'list': [
          {'icon': 'assets/icon-apps/icon-pc-1.png', 'title': '隐患整改', 'num': 5},
          {'icon': 'assets/icon-apps/icon-zl-2.png', 'title': '隐患记录', 'num': 0},
        ],
      },
      {
        'title': '监管帮扶',
        'list': [
          {'icon': 'assets/icon-apps/icon-pc-1.png', 'title': '隐患整改', 'num': 2},
          {'icon': 'assets/icon-apps/icon-zl-2.png', 'title': '隐患记录', 'num': 0},
        ],
      },
    ];

    return Scaffold(
      body: ListView.builder(
        physics: const AlwaysScrollableScrollPhysics(),
        padding: const EdgeInsets.all(0),
        itemCount: buttonInfos.length + 1,
        itemBuilder: (context, index) {
          // 第一项显示顶部图片
          if (index == 0) {
            return ClipRRect(
              child: Image.asset(
                'assets/images/apps-banner.jpg',
                fit: BoxFit.cover,
              ),
            );
          }
          // 后续显示各 section
          final section = buttonInfos[index - 1];
          final items = section['list'] as List<dynamic>;
          return Padding(
            padding: const EdgeInsets.only(top: 10),
            child: Container(
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(8),
              ),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  // Section title
                  Padding(
                    padding: const EdgeInsets.fromLTRB(10, 10, 10, 5),
                    child: Row(
                      children: [
                        Container(width: 2, height: 10, color: Colors.blue),
                        const SizedBox(width: 5),
                        Text(
                          section['title'] as String,
                          style: const TextStyle(
                            fontSize: 14,
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                      ],
                    ),
                  ),
                  // Items wrap
                  Padding(
                    padding: const EdgeInsets.all(10),
                    child: LayoutBuilder(
                      builder: (context, constraints) {
                        const spacing = 10.0;
                        // 4 items per row
                        final totalWidth = constraints.maxWidth;
                        final itemWidth = (totalWidth - spacing * 3) / 4;
                        return Wrap(
                          spacing: spacing,
                          runSpacing: spacing,
                          children:
                              items.map<Widget>((item) {
                                return SizedBox(
                                  width: itemWidth,
                                  child: _buildItem(item),
                                );
                              }).toList(),
                        );
                      },
                    ),
                  ),
                ],
              ),
            ),
          );
        },
      ),
    );
  }

  Widget _buildItem(Map<String, dynamic> item) {
    const double size = 60;
    final int badgeNum = item['num'] as int;
    return SizedBox(
      width: size,
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          // Image with badge overlay
          Stack(
            clipBehavior: Clip.none,
            children: [
              SizedBox(
                width: 30,
                height: 30,
                child: Image.asset(item['icon'] as String, fit: BoxFit.contain),
              ),
              if (badgeNum > 0)
                Positioned(
                  top: -5,
                  right: -10,
                  child: Container(
                    width: 16,
                    height: 16,
                    decoration: const BoxDecoration(
                      color: Colors.red,
                      shape: BoxShape.circle,
                    ),
                    alignment: Alignment.center,
                    child: Text(
                      badgeNum.toString(),
                      style: const TextStyle(color: Colors.white, fontSize: 10),
                    ),
                  ),
                ),
            ],
          ),
          const SizedBox(height: 4),
          Text(
            item['title'] as String,
            style: const TextStyle(fontSize: 12),
            textAlign: TextAlign.center,
          ),
        ],
      ),
    );
  }
}