// 引入wx-chart图表库
import WxChart from '../utils/wx-chart.js';

Page({
  data: {
    // 当前时间类型：year, month, quarter
    currentTimeType: 'year',
    // 当前周期文本
    currentPeriodText: '2023年',
    // 当前选中的饼图类型：income, expense
    currentPieType: 'income',
    // 收入总额
    incomeTotal: '¥128,500.00',
    // 支出总额
    expenseTotal: '¥85,300.00',
    // 当前选中的标签页
    currentTab: 'statistics',
    // 饼图图例数据
    currentPieLegend: [],
    
    // 图表实例
    trendChart: null,
    categoryChart: null,
    
    // 时间数据
    timeData: {
      year: {
        labels: ['1月', '2月', '3月', '4月', '5月', '6月', '7月', '8月', '9月', '10月', '11月', '12月'],
        income: [8500, 9200, 10500, 9800, 11200, 12500, 11800, 13200, 12800, 14500, 13800, 15200],
        expense: [6200, 5800, 6500, 7200, 6800, 7500, 8200, 7800, 8500, 7900, 8200, 8800],
        totalIncome: 128500,
        totalExpense: 85300
      },
      month: {
        labels: ['第1周', '第2周', '第3周', '第4周', '第5周'],
        income: [3200, 3800, 3500, 4200, 2800],
        expense: [2100, 2500, 1900, 2300, 1800],
        totalIncome: 17500,
        totalExpense: 10600
      },
      quarter: {
        labels: ['Q1', 'Q2', 'Q3', 'Q4'],
        income: [28200, 33500, 37800, 29000],
        expense: [18500, 21800, 24500, 20500],
        totalIncome: 128500,
        totalExpense: 85300
      }
    },
    
    // 分类数据
    categoryData: {
      income: {
        categories: ['工资', '奖金', '投资收益', '兼职', '其他'],
        data: [80000, 20000, 15000, 10000, 3500],
        colors: [
          'rgba(59, 130, 246, 0.8)',
          'rgba(59, 130, 246, 0.7)',
          'rgba(59, 130, 246, 0.6)',
          'rgba(59, 130, 246, 0.5)',
          'rgba(59, 130, 246, 0.4)'
        ]
      },
      expense: {
        categories: ['餐饮', '住房', '交通', '购物', '娱乐', '其他'],
        data: [25000, 30000, 8000, 12000, 5300, 5000],
        colors: [
          'rgba(239, 68, 68, 0.8)',
          'rgba(239, 68, 68, 0.7)',
          'rgba(239, 68, 68, 0.6)',
          'rgba(239, 68, 68, 0.5)',
          'rgba(239, 68, 68, 0.4)',
          'rgba(239, 68, 68, 0.3)'
        ]
      }
    },
    
    // 当前时间
    currentDate: {
      year: 2023,
      month: 1,
      quarter: 1
    }
  },
  
  onLoad() {
    // 初始化图表
    this.initCharts();
    // 初始化饼图图例
    this.updatePieLegend('income');
  },
  
  onReady() {
    // 页面渲染完成后执行
  },
  
  // 初始化图表
  initCharts() {
    // 初始化趋势图
    this.initTrendChart();
    // 初始化饼图
    this.initPieChart();
  },
  
  // 初始化趋势图
  initTrendChart() {
    const ctx = wx.createCanvasContext('trendChart', this);
    const data = this.data.timeData[this.data.currentTimeType];
    
    this.data.trendChart = new WxChart({
      canvasId: 'trendChart',
      type: 'line',
      categories: data.labels,
      series: [
        {
          name: '收入',
          data: data.income,
          color: '#3B82F6',
          format: function (val) {
            return '¥' + val.toFixed(0);
          }
        },
        {
          name: '支出',
          data: data.expense,
          color: '#EF4444',
          format: function (val) {
            return '¥' + val.toFixed(0);
          }
        }
      ],
      yAxis: {
        title: '金额 (¥)',
        format: function (val) {
          return val.toLocaleString();
        },
        min: 0
      },
      xAxis: {
        disableGrid: true
      },
      extra: {
        lineStyle: 'curve'
      }
    });
  },
  
  // 初始化饼图
  initPieChart() {
    const ctx = wx.createCanvasContext('categoryChart', this);
    const data = this.data.categoryData[this.data.currentPieType];
    
    this.data.categoryChart = new WxChart({
      canvasId: 'categoryChart',
      type: 'pie',
      series: data.data,
      labels: data.categories,
      colors: data.colors,
      extra: {
        pie: {
          offsetAngle: -90,
          radius: 80
        }
      },
      format: function (val, name) {
        const total = data.data.reduce((a, b) => a + b, 0);
        const percentage = Math.round((val / total) * 100) + '%';
        return `${name}: ¥${val.toLocaleString()} (${percentage})`;
      }
    });
  },
  
  // 切换时间类型
  changeTimeType(e) {
    const type = e.currentTarget.dataset.type;
    if (this.data.currentTimeType === type) return;
    
    this.setData({
      currentTimeType: type
    }, () => {
      // 更新时间周期显示
      this.updatePeriodDisplay();
      // 更新趋势图数据
      this.updateTrendChart();
      // 更新总额显示
      this.updateTotalAmounts();
    });
  },
  
  // 更新时间周期显示
  updatePeriodDisplay() {
    const { year, month, quarter } = this.data.currentDate;
    let text = '';
    
    switch (this.data.currentTimeType) {
      case 'year':
        text = `${year}年`;
        break;
      case 'month':
        text = `${year}年${month}月`;
        break;
      case 'quarter':
        text = `${year}年第${quarter}季度`;
        break;
    }
    
    this.setData({
      currentPeriodText: text
    });
  },
  
  // 更新趋势图数据
  updateTrendChart() {
    const data = this.data.timeData[this.data.currentTimeType];
    
    this.data.trendChart.updateData({
      categories: data.labels,
      series: [
        {
          name: '收入',
          data: data.income
        },
        {
          name: '支出',
          data: data.expense
        }
      ]
    });
  },
  
  // 更新总额显示
  updateTotalAmounts() {
    const data = this.data.timeData[this.data.currentTimeType];
    
    this.setData({
      incomeTotal: this.formatCurrency(data.totalIncome),
      expenseTotal: this.formatCurrency(data.totalExpense)
    });
  },
  
  // 切换饼图类型
  changePieType(e) {
    const type = e.currentTarget.dataset.type;
    if (this.data.currentPieType === type) return;
    
    this.setData({
      currentPieType: type
    }, () => {
      // 更新饼图数据
      this.updatePieChart();
      // 更新饼图图例
      this.updatePieLegend(type);
    });
  },
  
  // 更新饼图数据
  updatePieChart() {
    const data = this.data.categoryData[this.data.currentPieType];
    
    this.data.categoryChart.updateData({
      series: data.data,
      labels: data.categories,
      colors: data.colors
    });
  },
  
  // 更新饼图图例
  updatePieLegend(type) {
    const data = this.data.categoryData[type];
    const total = data.data.reduce((a, b) => a + b, 0);
    const legend = [];
    
    data.categories.forEach((category, index) => {
      const value = data.data[index];
      const percentage = Math.round((value / total) * 100) + '%';
      
      legend.push({
        name: category,
        value: this.formatCurrency(value),
        percent: percentage,
        color: data.colors[index]
      });
    });
    
    this.setData({
      currentPieLegend: legend
    });
  },
  
  // 上一个周期
  prevPeriod() {
    const { currentDate, currentTimeType } = this.data;
    const newDate = { ...currentDate };
    
    switch (currentTimeType) {
      case 'year':
        newDate.year--;
        break;
      case 'month':
        newDate.month--;
        if (newDate.month < 1) {
          newDate.month = 12;
          newDate.year--;
        }
        break;
      case 'quarter':
        newDate.quarter--;
        if (newDate.quarter < 1) {
          newDate.quarter = 4;
          newDate.year--;
        }
        break;
    }
    
    this.setData({
      currentDate: newDate
    }, () => {
      this.updatePeriodDisplay();
      // 实际应用中这里应该根据新日期请求数据
    });
  },
  
  // 下一个周期
  nextPeriod() {
    const { currentDate, currentTimeType } = this.data;
    const newDate = { ...currentDate };
    
    switch (currentTimeType) {
      case 'year':
        newDate.year++;
        break;
      case 'month':
        newDate.month++;
        if (newDate.month > 12) {
          newDate.month = 1;
          newDate.year++;
        }
        break;
      case 'quarter':
        newDate.quarter++;
        if (newDate.quarter > 4) {
          newDate.quarter = 1;
          newDate.year++;
        }
        break;
    }
    
    this.setData({
      currentDate: newDate
    }, () => {
      this.updatePeriodDisplay();
      // 实际应用中这里应该根据新日期请求数据
    });
  },
  
  // 格式化货币
  formatCurrency(value) {
    return '¥' + value.toLocaleString('zh-CN', {
      minimumFractionDigits: 2,
      maximumFractionDigits: 2
    });
  },
  
  // 趋势图点击事件
  touchTrendChart(e) {
    this.data.trendChart.showToolTip(e, {
      format: function (item, category) {
        return `${category} ${item.name}: ${item.data}`;
      }
    });
  },
  
  // 饼图点击事件
  touchPieChart(e) {
    this.data.categoryChart.showToolTip(e, {
      format: function (item, category) {
        return `${category}: ${item.data}`;
      }
    });
  }
});