import 'package:flutter/material.dart';
import 'package:fl_chart/fl_chart.dart';
import 'package:provider/provider.dart';
import '../models/wakatime_summary.dart';
import '../services/wakatime_service.dart';
import '../services/auth_service.dart';

class WakatimeScreen extends StatefulWidget {
  const WakatimeScreen({super.key});

  @override
  State<WakatimeScreen> createState() => _WakatimeScreenState();
}

class _WakatimeScreenState extends State<WakatimeScreen> {
  final WakatimeService _wakatimeService = WakatimeService();
  WakatimeSummary? _summary;
  bool _isLoading = false;
  String? _error;
  final TextEditingController _startDateController = TextEditingController();
  final TextEditingController _endDateController = TextEditingController();
  int? _touchedIndex;

  // 预定义的颜色列表
  final List<Color> _colors = [
    Colors.blue,
    Colors.red,
    Colors.green,
    Colors.orange,
    Colors.purple,
    Colors.teal,
    Colors.pink,
    Colors.indigo,
    Colors.amber,
    Colors.cyan,
    Colors.lime,
    Colors.brown,
  ];

  @override
  void initState() {
    super.initState();
    // 设置默认日期为今天和昨天
    final now = DateTime.now();
    _startDateController.text =
        _formatDate(now.subtract(const Duration(days: 1)));
    _endDateController.text = _formatDate(now);
  }

  String _formatDate(DateTime date) {
    return '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
  }

  String _formatDuration(int seconds) {
    final hours = seconds ~/ 3600;
    final minutes = (seconds % 3600) ~/ 60;
    return '${hours}小时${minutes}分钟';
  }

  Future<void> _fetchData() async {
    final authService = Provider.of<AuthService>(context, listen: false);
    final token = authService.credentials['wakatime_token'];

    if (token == null || token.isEmpty) {
      setState(() => _error = '请在设置中配置Wakatime API Token');
      return;
    }

    setState(() {
      _isLoading = true;
      _error = null;
    });

    try {
      final summary = await _wakatimeService.getSummary(
        token,
        _startDateController.text,
        _endDateController.text,
      );
      setState(() {
        _summary = summary;
        _isLoading = false;
      });
    } catch (e) {
      setState(() {
        _error = e.toString();
        _isLoading = false;
      });
    }
  }

  Widget _buildLegend(List<dynamic> data, String Function(dynamic) getName) {
    return Wrap(
      spacing: 16,
      runSpacing: 8,
      children: data.asMap().entries.map((entry) {
        final index = entry.key;
        final item = entry.value;
        final isTouched = index == _touchedIndex;
        return Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Container(
              width: 16,
              height: 16,
              color: _colors[index % _colors.length],
            ),
            const SizedBox(width: 8),
            Text(
              '${getName(item)}${isTouched ? ' (${_formatDuration(item.totalSeconds)})' : ''}',
              style: TextStyle(
                fontSize: 12,
                fontWeight: isTouched ? FontWeight.bold : FontWeight.normal,
              ),
            ),
          ],
        );
      }).toList(),
    );
  }

  Widget _buildPieChart(
      List<dynamic> data, String title, String Function(dynamic) getName) {
    return Column(
      children: [
        Text(
          title,
          style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
        ),
        const SizedBox(height: 16),
        _buildLegend(data, getName),
        const SizedBox(height: 16),
        SizedBox(
          height: 300,
          child: PieChart(
            PieChartData(
              pieTouchData: PieTouchData(
                touchCallback: (FlTouchEvent event, pieTouchResponse) {
                  setState(() {
                    if (!event.isInterestedForInteractions ||
                        pieTouchResponse == null ||
                        pieTouchResponse.touchedSection == null) {
                      _touchedIndex = null;
                      return;
                    }
                    _touchedIndex =
                        pieTouchResponse.touchedSection!.touchedSectionIndex;
                  });
                },
              ),
              sections: data.asMap().entries.map((entry) {
                final index = entry.key;
                final item = entry.value;
                final isTouched = index == _touchedIndex;
                final percent = item.percent;
                return PieChartSectionData(
                  value: item.totalSeconds.toDouble(),
                  title: percent > 5
                      ? '${getName(item)}\n${percent.toStringAsFixed(1)}%'
                      : '',
                  radius: isTouched ? 110 : 100,
                  titleStyle: const TextStyle(
                    fontSize: 12,
                    fontWeight: FontWeight.bold,
                    color: Colors.white,
                  ),
                  color: _colors[index % _colors.length],
                );
              }).toList(),
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildProjectList() {
    final projects = _summary!.getAggregatedProjects();
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          '项目时间分布',
          style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
        ),
        const SizedBox(height: 16),
        ListView.builder(
          shrinkWrap: true,
          physics: const NeverScrollableScrollPhysics(),
          itemCount: projects.length,
          itemBuilder: (context, index) {
            final project = projects[index];
            return Card(
              margin: const EdgeInsets.only(bottom: 8),
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: Row(
                  children: [
                    Container(
                      width: 16,
                      height: 16,
                      color: _colors[index % _colors.length],
                    ),
                    const SizedBox(width: 16),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            project.name,
                            style: const TextStyle(
                              fontSize: 16,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                          const SizedBox(height: 4),
                          Text(
                            _formatDuration(project.totalSeconds.toInt()),
                            style: TextStyle(
                              fontSize: 14,
                              color: Colors.grey[600],
                            ),
                          ),
                        ],
                      ),
                    ),
                    Text(
                      '${project.percent.toStringAsFixed(1)}%',
                      style: const TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ],
                ),
              ),
            );
          },
        ),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Wakatime 统计'),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // 日期选择
            Row(
              children: [
                Expanded(
                  child: TextField(
                    controller: _startDateController,
                    decoration: const InputDecoration(
                      labelText: '开始日期',
                      hintText: 'YYYY-MM-DD',
                    ),
                  ),
                ),
                const SizedBox(width: 16),
                Expanded(
                  child: TextField(
                    controller: _endDateController,
                    decoration: const InputDecoration(
                      labelText: '结束日期',
                      hintText: 'YYYY-MM-DD',
                    ),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),

            // 获取数据按钮
            ElevatedButton(
              onPressed: _isLoading ? null : _fetchData,
              child: _isLoading
                  ? const CircularProgressIndicator()
                  : const Text('获取数据'),
            ),
            const SizedBox(height: 16),

            // 错误提示
            if (_error != null)
              Text(
                _error!,
                style: const TextStyle(color: Colors.red),
              ),

            // 数据展示
            if (_summary != null) ...[
              const Text(
                '总编码时间',
                style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
              ),
              Text(_summary!.cumulativeTotal.text),
              const SizedBox(height: 24),

              // 语言使用饼图
              _buildPieChart(
                _summary!.getAggregatedLanguages(),
                '编程语言使用情况',
                (lang) => lang.name,
              ),
              const SizedBox(height: 24),

              // 编辑器使用饼图
              _buildPieChart(
                _summary!.getAggregatedEditors(),
                '编辑器使用情况',
                (editor) => editor.name,
              ),
              const SizedBox(height: 24),

              // 项目时间分布
              _buildProjectList(),
            ],
          ],
        ),
      ),
    );
  }

  @override
  void dispose() {
    _startDateController.dispose();
    _endDateController.dispose();
    super.dispose();
  }
}