import 'package:blog_app/apis/blog.dart';
import 'package:blog_app/models/blog.dart';
import 'package:blog_app/models/common.dart';
import 'package:blog_app/widget/chart.dart';
import 'package:blog_app/widget/common.dart';
import 'package:blog_app/widget/year_selector.dart';
import 'package:flutter/material.dart';

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

  @override
  StatsPageState createState() => StatsPageState();
}

class StatsPageState extends State<StatsPage> {
  final double chartHeight = 400;
  final double statsHeight = 120;
  int currentYear = DateTime.now().year;

  late List<ChartData> approvedStats = [];
  late List<ChartData> visitStats = [];
  late List<ChartData> visitRankStats = [];
  late List<ChartData> categoryStats = [];
  late List<ChartData> readRankStats = [];
  late BlogStats overviewStats = BlogStats(
    blogCount: 0,
    categoryCount: 0,
    greatCount: 0,
    visitCount: 0,
    wordCount: 0,
  );

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

  Future<void> _loadStatsList() async {
    try {
      final approvedResult = await queryBlogApprovedStatsApi(currentYear);
      final visitResult = await queryBlogVisitStatsApi(currentYear);
      final visitRankResult = await queryBlogVisitRankStatsApi();
      final categoryResult = await queryBlogCategoryStatsApi();
      final readRankResult = await queryBlogReadRankStatsApi();
      final overviewResult = await queryBlogOverviewStatsApi();

      setState(() {
        approvedStats = approvedResult;
        visitStats = visitResult;
        visitRankStats = visitRankResult;
        categoryStats = categoryResult;
        readRankStats = readRankResult;
        overviewStats = overviewResult;
      });
    } catch (e) {
      throw Exception('获取统计数据失败: $e');
    }
  }

  Widget _buildApprovedStats(BuildContext context) {
    return Column(
      children: [
        buildChartTitle(context, '每月博客发布统计', Icons.show_chart),
        const SizedBox(height: 3),
        buildChartDivider(context),
        const SizedBox(height: 3),
        Expanded(
          child: lineChart(
            context: context,
            xAxisName: '月份',
            yAxisName: '数量',
            unit: '篇',
            data: approvedStats,
          ),
        ),
      ],
    );
  }

  Widget _buildVisitStats(BuildContext context) {
    return Column(
      children: [
        buildChartTitle(context, '每月博客访问统计', Icons.show_chart),
        const SizedBox(height: 3),
        buildChartDivider(context),
        const SizedBox(height: 3),
        Expanded(
          child: lineChart(
            context: context,
            xAxisName: '月份',
            yAxisName: '访问量',
            unit: '人次',
            data: visitStats,
          ),
        ),
      ],
    );
  }

  Widget _buildVisitRankStats(BuildContext context) {
    return Column(
      children: [
        buildChartTitle(context, '博客访问数量排行', Icons.bar_chart),
        const SizedBox(height: 3),
        buildChartDivider(context),
        const SizedBox(height: 3),
        Expanded(
          child: barChart(
            context: context,
            xAxisName: '名称',
            yAxisName: '访问量',
            unit: '人次',
            data: visitRankStats,
          ),
        ),
      ],
    );
  }

  Widget _buildCategoryStats(BuildContext context) {
    return Column(
      children: [
        buildChartTitle(context, '博客类别统计', Icons.pie_chart),
        const SizedBox(height: 3),
        buildChartDivider(context),
        const SizedBox(height: 3),
        Expanded(
          child: pieChart(context: context, unit: '篇', data: categoryStats),
        ),
      ],
    );
  }

  Widget _buildReadRankStats(BuildContext context) {
    return Column(
      children: [
        buildChartTitle(context, '博客阅读时长排行', Icons.bar_chart),
        const SizedBox(height: 3),
        buildChartDivider(context),
        const SizedBox(height: 3),
        Expanded(
          child: barChart(
            context: context,
            xAxisName: '名称',
            yAxisName: '时长',
            unit: '分钟',
            data: readRankStats,
          ),
        ),
      ],
    );
  }

  Widget buildStatsCard({
    required BuildContext context,
    required String title,
    required int count,
    required String unit,
  }) {
    return buildCard(
      context: context,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          Text(
            title,
            style: TextStyle(
              fontSize: 16,
              color: Colors.grey.shade600,
              fontWeight: FontWeight.w500,
            ),
          ),
          const SizedBox(height: 12),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.end,
            children: [
              Text(
                count.toString(),
                style: const TextStyle(
                  fontSize: 28,
                  fontWeight: FontWeight.bold,
                  color: Colors.black87,
                  height: 1.0,
                ),
              ),
              const SizedBox(width: 4),
              Text(
                unit,
                style: TextStyle(
                  fontSize: 14,
                  color: Colors.grey.shade600,
                  fontWeight: FontWeight.w500,
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget buildBlogStatsGrid(BuildContext context) {
    return GridView.count(
      crossAxisCount: 2,
      shrinkWrap: true,
      physics: const NeverScrollableScrollPhysics(),
      childAspectRatio: 2,
      children: [
        buildStatsCard(
          context: context,
          title: '博客数量',
          count: overviewStats.blogCount,
          unit: '篇',
        ),
        buildStatsCard(
          context: context,
          title: '分类数量',
          count: overviewStats.categoryCount,
          unit: '个',
        ),
        buildStatsCard(
          context: context,
          title: '访问量',
          count: overviewStats.visitCount,
          unit: '次',
        ),
        buildStatsCard(
          context: context,
          title: '总字数',
          count: overviewStats.wordCount,
          unit: '字',
        ),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      child: Column(
        children: [
          YearSelector(
            initialYear: DateTime.now().year,
            minYear: 2000,
            maxYear: 2100,
            onYearChanged:
                (year) => {
                  setState(() {
                    currentYear = year;
                    _loadStatsList();
                  }),
                },
          ),
          SizedBox(height: 6),
          buildBlogStatsGrid(context),
          SizedBox(height: 6),
          SizedBox(
            height: chartHeight,
            child: buildCard(
              context: context,
              child: _buildApprovedStats(context),
            ),
          ),
          SizedBox(height: 6),
          SizedBox(
            height: chartHeight,
            child: buildCard(
              context: context,
              child: _buildVisitStats(context),
            ),
          ),
          SizedBox(height: 6),
          SizedBox(
            height: chartHeight,
            child: buildCard(
              context: context,
              child: _buildVisitRankStats(context),
            ),
          ),
          SizedBox(height: 6),
          SizedBox(
            height: chartHeight,
            child: buildCard(
              context: context,
              child: _buildCategoryStats(context),
            ),
          ),
          SizedBox(height: 6),
          SizedBox(
            height: chartHeight,
            child: buildCard(
              context: context,
              child: _buildReadRankStats(context),
            ),
          ),
        ],
      ),
    );
  }
}