import 'package:flutter/material.dart';

import 'plugins.dart';

/// 工具网格：可搜索的插件入口。
///
/// 工具页面的实现全部在 lib/tools/ 下，是从 mathtool2 直接搬过来的
/// （依赖 rational / math_expressions / fl_chart，全是纯 Dart）。
class ToolsPage extends StatefulWidget {
  const ToolsPage({super.key});

  @override
  State<ToolsPage> createState() => _ToolsPageState();
}

class _ToolsPageState extends State<ToolsPage> {
  final _search = TextEditingController();
  String _q = '';

  static const _palette = <Color>[
    Color(0xFF5C6BC0),
    Color(0xFF26A69A),
    Color(0xFFEF5350),
    Color(0xFFAB47BC),
    Color(0xFF42A5F5),
    Color(0xFFFFA726),
    Color(0xFF66BB6A),
    Color(0xFF8D6E63),
  ];

  @override
  void dispose() {
    _search.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final items = kTools.where((t) => t.matches(_q)).toList();

    return Column(
      children: [
        Padding(
          padding: const EdgeInsets.fromLTRB(16, 12, 16, 8),
          child: TextField(
            controller: _search,
            decoration: InputDecoration(
              isDense: true,
              hintText: '搜索工具（支持拼音首字母）',
              prefixIcon: const Icon(Icons.search),
              suffixIcon: _q.isEmpty
                  ? null
                  : IconButton(
                      icon: const Icon(Icons.clear),
                      onPressed: () {
                        _search.clear();
                        setState(() => _q = '');
                      },
                    ),
              border: const OutlineInputBorder(),
            ),
            onChanged: (v) => setState(() => _q = v),
          ),
        ),
        Expanded(
          child: items.isEmpty
              ? const Center(child: Text('没有匹配的工具'))
              : GridView.builder(
                  padding: const EdgeInsets.fromLTRB(16, 8, 16, 16),
                  gridDelegate:
                      const SliverGridDelegateWithFixedCrossAxisCount(
                    crossAxisCount: 2,
                    mainAxisSpacing: 12,
                    crossAxisSpacing: 12,
                    childAspectRatio: 1.5,
                  ),
                  itemCount: items.length,
                  itemBuilder: (_, i) {
                    final t = items[i];
                    final color = _palette[kTools.indexOf(t) % _palette.length];
                    return _ToolCard(
                      plugin: t,
                      color: color,
                      onTap: () => Navigator.of(context).push(
                        MaterialPageRoute<void>(
                          builder: (_) => t.build(),
                          settings: RouteSettings(name: t.name),
                        ),
                      ),
                    );
                  },
                ),
        ),
      ],
    );
  }
}

class _ToolCard extends StatelessWidget {
  const _ToolCard({
    required this.plugin,
    required this.color,
    required this.onTap,
  });

  final ToolPlugin plugin;
  final Color color;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    return Material(
      color: Colors.transparent,
      child: InkWell(
        onTap: onTap,
        borderRadius: BorderRadius.circular(16),
        child: Ink(
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(16),
            gradient: LinearGradient(
              begin: Alignment.topLeft,
              end: Alignment.bottomRight,
              colors: [color, Color.lerp(color, Colors.black, 0.22)!],
            ),
          ),
          padding: const EdgeInsets.all(14),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Icon(plugin.icon, color: Colors.white, size: 26),
              Text(
                plugin.name,
                style: const TextStyle(
                  color: Colors.white,
                  fontSize: 15,
                  fontWeight: FontWeight.w600,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}