// math_tools_app.dart
import 'package:flutter/material.dart';
import 'package:flutter/services.dart'; 
import 'package:font_awesome_flutter/font_awesome_flutter.dart'; // 添加这行

import 'tools/cuo_wei_xiang_jian.dart';
import 'tools/binomial_distribution.dart';
import 'tools/hypergeometric_distribution.dart';
import 'tools/chi_square.dart';
import 'tools/regression.dart';
import 'tools/mixed_variance.dart';
import 'tools/histogram.dart';
import 'tools/symmetry.dart';
import 'tools/circle_equation.dart';
import 'tools/vector_normal.dart';
import 'tools/bisection_method.dart';
import 'tools/function_plotter.dart';
import 'tools/parametric_plotter.dart';
import 'tools/derivative_calculator.dart';
import 'tools/advanced_ide.dart';
import 'tools/convolution_calculator.dart';
import 'tools/statistical_charts.dart';

class MathToolsApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: '某人的小工具',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MainPage(),
    );
  }
}

class MainPage extends StatefulWidget {
  @override
  _MainPageState createState() => _MainPageState();
}

class _MainPageState extends State<MainPage> {
  // 定义渐变色列表
  final List<Color> colorGradient = [
  Color(0xFFff6b6b), // 红色
  Color(0xFFffa726), // 橙色
  Color(0xFFffee58), // 黄色
  Color(0xFF66bb6a), // 绿色
  Color(0xFF42a5f5), // 蓝色
];

  final List<MathTool> allTools = [
    MathTool('错位相减法', FontAwesomeIcons.subscript, CuoWeiXiangJianPage()),
    MathTool('二项分布', FontAwesomeIcons.dice, BinomialDistributionPage()), // 改为骰子图标
    MathTool('超几何分布', FontAwesomeIcons.chartPie, HypergeometricDistributionPage()),
    MathTool('卷积分布列', FontAwesomeIcons.layerGroup, ConvolutionCalculatorPage()),
    MathTool('卡方检验', FontAwesomeIcons.checkSquare, ChiSquarePage()),
    MathTool('线性回归', FontAwesomeIcons.chartLine, RegressionPage()),
    MathTool('混合方差', FontAwesomeIcons.balanceScale, MixedVariancePage()),
    MathTool('直方图统计', FontAwesomeIcons.chartBar, HistogramPage()),
    MathTool('统计图表', FontAwesomeIcons.chartArea, StatisticalChartsPage()),
    MathTool('对称变换', FontAwesomeIcons.exchangeAlt, SymmetryPage()),
    MathTool('圆的方程', FontAwesomeIcons.circle, CircleEquationPage()),
    MathTool('三点法向量', FontAwesomeIcons.cube, VectorNormalPage()),
    MathTool('二分法求根', FontAwesomeIcons.search, BisectionMethodPage()),
    MathTool('函数图像绘制', FontAwesomeIcons.projectDiagram, FunctionPlotterPage()),
    MathTool('参数方程绘图', FontAwesomeIcons.waveSquare, ParametricPlotterPage()),
    MathTool('导数计算器', FontAwesomeIcons.calculator, DerivativeCalculatorPage()),
    MathTool('高级', FontAwesomeIcons.code, AdvancedIdePage()),
    MathTool('关于', FontAwesomeIcons.infoCircle, AboutPage()),
  ];

  List<MathTool> filteredTools = [];
  TextEditingController searchController = TextEditingController();
  FocusNode searchFocusNode = FocusNode();

  @override
  void initState() {
    super.initState();
    filteredTools = List.from(allTools);
    searchController.addListener(_onSearchChanged);
  }

  @override
  void dispose() {
    searchController.dispose();
    searchFocusNode.dispose();
    super.dispose();
  }

  void _onSearchChanged() {
    setState(() {
      if (searchController.text.isEmpty) {
        filteredTools = List.from(allTools);
      } else {
        filteredTools = allTools.where((tool) {
          return tool.name.toLowerCase().contains(searchController.text.toLowerCase());
        }).toList();
      }
    });
  }

  void _clearSearch() {
    setState(() {
      searchController.clear();
      filteredTools = List.from(allTools);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Row(
          children: [
            Text('某人的小工具', style: TextStyle(color: Colors.black)),
            Expanded(
              child: Container(
                margin: EdgeInsets.only(left: 16),
                height: 40,
                child: TextField(
                  controller: searchController,
                  focusNode: searchFocusNode,
                  decoration: InputDecoration(
                    hintText: '搜索工具...',
                    hintStyle: TextStyle(fontSize: 14),
                    prefixIcon: Icon(Icons.search, size: 20, color: Colors.grey),
                    suffixIcon: searchController.text.isNotEmpty
                        ? IconButton(
                            icon: Icon(Icons.clear, size: 20, color: Colors.grey),
                            onPressed: _clearSearch,
                          )
                        : null,
                    contentPadding: EdgeInsets.symmetric(vertical: 8, horizontal: 12),
                    filled: true,
                    fillColor: Colors.grey[100],
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(20),
                      borderSide: BorderSide.none,
                    ),
                    enabledBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(20),
                      borderSide: BorderSide.none,
                    ),
                    focusedBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(20),
                      borderSide: BorderSide(color: Colors.blue, width: 1),
                    ),
                  ),
                  style: TextStyle(fontSize: 14),
                ),
              ),
            ),
          ],
        ),
        backgroundColor: Colors.white,
        elevation: 1,
      ),
      body: filteredTools.isEmpty
          ? Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  FaIcon(FontAwesomeIcons.search, size: 60, color: Colors.grey[400]),
                  SizedBox(height: 16),
                  Text(
                    '没有找到相关工具',
                    style: TextStyle(
                      fontSize: 18,
                      color: Colors.grey[600],
                    ),
                  ),
                  SizedBox(height: 8),
                  Text(
                    '请尝试使用其他关键词搜索',
                    style: TextStyle(
                      fontSize: 14,
                      color: Colors.grey[500],
                    ),
                  ),
                  SizedBox(height: 20),
                  ElevatedButton(
                    onPressed: _clearSearch,
                    style: ElevatedButton.styleFrom(
                      backgroundColor: Colors.blue,
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(20),
                      ),
                    ),
                    child: Text('清空搜索', style: TextStyle(color: Colors.white)),
                  ),
                ],
              ),
            )
          : GridView.builder(
              padding: EdgeInsets.all(16),
              gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                crossAxisCount: 2,
                crossAxisSpacing: 16,
                mainAxisSpacing: 16,
                childAspectRatio: 1.2,
              ),
              itemCount: filteredTools.length,
              itemBuilder: (context, index) {
                // 根据索引计算渐变色
                final colorIndex = (index / filteredTools.length * (colorGradient.length - 1)).clamp(0, colorGradient.length - 1).toInt();
                final nextColorIndex = (colorIndex + 1).clamp(0, colorGradient.length - 1);
                final progress = (index / filteredTools.length * (colorGradient.length - 1)) - colorIndex;
                
                final color = Color.lerp(colorGradient[colorIndex], colorGradient[nextColorIndex], progress)!;
                
                return _buildToolCard(filteredTools[index], color, context);
              },
            ),
    );
  }

  Widget _buildToolCard(MathTool tool, Color color, BuildContext context) {
  return Card(
    elevation: 4,
    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
    child: InkWell(
      borderRadius: BorderRadius.circular(12),
      onTap: () {
        Navigator.push(
          context,
          MaterialPageRoute(builder: (context) => tool.page),
        );
      },
      child: Container(
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(12),
          color: Colors.white, // 改为白色背景
        ),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            FaIcon(tool.icon, size: 40, color: color),
            SizedBox(height: 8),
            Text(
              tool.name,
              textAlign: TextAlign.center,
              style: TextStyle(
                fontSize: 16,
                fontWeight: FontWeight.bold,
                color: color,
              ),
            ),
          ],
        ),
      ),
    ),
  );
}
}

class MathTool {
  final String name;
  final IconData icon;
  final Widget page;

  MathTool(this.name, this.icon, this.page);
}

// 关于页面
class AboutPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('关于', style: TextStyle(color: Colors.black)),
        backgroundColor: Colors.white,
        elevation: 1,
      ),
      body: Padding(
        padding: EdgeInsets.all(20),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Center(
              child: FaIcon(
                FontAwesomeIcons.calculator,
                size: 80,
                color: Colors.blue,
              ),
            ),
            SizedBox(height: 20),
            Center(
              child: Text(
                '某人的小工具',
                style: TextStyle(
                  fontSize: 28,
                  fontWeight: FontWeight.bold,
                  color: Colors.blue,
                ),
              ),
            ),
            SizedBox(height: 10),
            Center(
              child: Text(
                '版本 1.1.0',
                style: TextStyle(
                  fontSize: 16,
                  color: Colors.grey[600],
                ),
              ),
            ),
            SizedBox(height: 30),
            Text(
              '应用介绍',
              style: TextStyle(
                fontSize: 20,
                fontWeight: FontWeight.bold,
              ),
            ),
            SizedBox(height: 10),
            Text(
              '某人的小工具是一款专为高中教师设计的验算工具，'
              '提供了多种实用的数学计算和统计工具，帮助您更轻松地解决数学问题。'
              '由于是个人使用，主打的就是能用就行。',
              style: TextStyle(fontSize: 16, height: 1.5),
            ),
            SizedBox(height: 20),
            Text(
              '功能特点',
              style: TextStyle(
                fontSize: 20,
                fontWeight: FontWeight.bold,
              ),
            ),
            SizedBox(height: 10),
            Expanded(
              child: ListView(
                children: [
                  _buildFeatureItem('统计概率', '分布列计算、数字特征'),
                  _buildFeatureItem('数列计算', '错位相减'),
                  _buildFeatureItem('解析几何', '对称变换、圆的方程'),
                  _buildFeatureItem('函数导数', '图像绘制、导数求解'),
                  _buildFeatureItem('高级功能', '手动编程'),
                ],
              ),
            ),
            SizedBox(height: 20),
            Center(
              child: Column(
                children: [
                  Text(
                    '个人使用，严禁传播',
                    style: TextStyle(
                      fontSize: 14,
                      color: Colors.grey[600],
                    ),
                    textAlign: TextAlign.center,
                  ),
                  SizedBox(height: 8),
                  // 邮箱复制按钮
                  InkWell(
                    onTap: () {
                      _copyToClipboard('nonvioce@qq.com', context);
                    },
                    child: Container(
                      padding: EdgeInsets.symmetric(horizontal: 16, vertical: 8),
                      decoration: BoxDecoration(
                        color: Colors.blue[50],
                        borderRadius: BorderRadius.circular(20),
                        border: Border.all(color: Colors.blue[200]!),
                      ),
                      child: Row(
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          FaIcon(FontAwesomeIcons.envelope, size: 16, color: Colors.blue[700]),
                          SizedBox(width: 6),
                          Text(
                            '反馈邮箱：nonvioce@qq.com',
                            style: TextStyle(
                              fontSize: 14,
                              color: Colors.blue[700],
                              fontWeight: FontWeight.w500,
                            ),
                          ),
                          SizedBox(width: 4),
                          FaIcon(FontAwesomeIcons.copy, size: 14, color: Colors.blue[700]),
                        ],
                      ),
                    ),
                  ),
                  SizedBox(height: 10),
                  Text(
                    '©保留一切权利',
                    style: TextStyle(
                      fontSize: 12,
                      color: Colors.grey[600],
                      fontStyle: FontStyle.italic,
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildFeatureItem(String title, String description) {
    return Padding(
      padding: EdgeInsets.symmetric(vertical: 8),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          FaIcon(FontAwesomeIcons.checkCircle, color: Colors.green, size: 20),
          SizedBox(width: 10),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  title,
                  style: TextStyle(
                    fontSize: 16,
                    fontWeight: FontWeight.w500,
                  ),
                ),
                Text(
                  description,
                  style: TextStyle(
                    fontSize: 14,
                    color: Colors.grey[600],
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  // 复制到剪贴板的函数
  void _copyToClipboard(String text, BuildContext context) {
    Clipboard.setData(ClipboardData(text: text));
    
    // 显示复制成功的提示
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text('邮箱地址已复制到剪贴板'),
        duration: Duration(seconds: 2),
        behavior: SnackBarBehavior.floating,
      ),
    );
  }
}