import 'package:flutter/material.dart';
import 'package:flutter_common/widget/chart.dart';
import 'package:flutter_common/widget/common_widget.dart';
import 'package:food_hub_app/provider/food_provider.dart';
import 'package:food_hub_app/widgets/stats/card.dart';
import 'package:provider/provider.dart';

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

  @override
  State<StatsPage> createState() => _StatsPage();
}

class _StatsPage extends State<StatsPage> {
  final double chartHeight = 400;

  @override
  void initState() {
    super.initState();

    // 初始化加载数据
    WidgetsBinding.instance.addPostFrameCallback((_) {
      context.read<FoodProvider>().refreshFoodStats();
    });
  }

  Widget _buildSummaryStats(FoodProvider provider) {
    return GridView.count(
      shrinkWrap: true,
      physics: const NeverScrollableScrollPhysics(),
      // 禁用网格自身滚动
      crossAxisCount: 2,
      crossAxisSpacing: 8,
      mainAxisSpacing: 8,
      childAspectRatio: 2,
      children: [
        StatisticCard(
          icon: Icons.restaurant_menu,
          color: Colors.blue,
          title: '菜谱总数',
          value: provider.summaryStats.recipeCount,
          unit: '个',
        ),
        StatisticCard(
          icon: Icons.grid_view_rounded,
          color: Colors.green,
          title: '菜谱类别',
          value: provider.summaryStats.categoryCount,
          unit: '种',
        ),
        StatisticCard(
          icon: Icons.flag,
          color: Colors.orange,
          title: '做菜次数',
          value: provider.summaryStats.workCount,
          unit: '个',
        ),
        StatisticCard(
          icon: Icons.show_chart,
          color: Colors.red,
          title: '平均次数',
          value: double.parse(provider.averageRecordCount.toStringAsFixed(2)),
          unit: '次/月',
        ),
      ],
    );
  }

  Widget _buildContent(FoodProvider provider) {
    return Column(
      children: [
        _buildSummaryStats(provider),
        SizedBox(height: 8),
        SizedBox(
          height: chartHeight,
          child: CommonCard(
            child: LineChart(
              title: '记录统计',
              xAxisName: '日期',
              yAxisName: '次数',
              unit: '次',
              data: provider.recordStats,
            ),
          ),
        ),
        SizedBox(height: 8),
        SizedBox(
          height: chartHeight,
          child: CommonCard(
            child: PieChart(
              title: '菜谱统计',
              unit: '个',
              data: provider.categoryStats,
            ),
          ),
        ),
        SizedBox(height: 8),
        SizedBox(
          height: chartHeight,
          child: CommonCard(
            child: RankChart(title: '排行榜', data: provider.rankStats, unit: '次'),
          ),
        ),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    final provider = context.watch<FoodProvider>();

    return Stack(
      children: [
        if (provider.isLoading)
          buildLoadingIndicator()
        else
          SingleChildScrollView(child: _buildContent(provider)),
      ],
    );
  }
}