EmailBill/Web/src/views/statisticsV2/modules/ExpenseCategoryCard.vue

<template>
  <!-- 支出分类统计 -->
  <div
    class="common-card expense-category-card"
    style="padding: 12px;"
  >
    <div class="card-header">
      <h3 class="card-title">
        支出分类
      </h3>
      <van-tag
        type="primary"
        size="medium"
      >
        {{ expenseCategoriesView.length }}类
      </van-tag>
    </div>
    <!-- 环形图区域 -->
    <div
      v-if="expenseCategoriesView.length > 0"
      class="chart-container"
    >
      <div class="ring-chart">
        <BaseChart
          type="doughnut"
          :data="chartData"
          :options="chartOptions"
          :plugins="[pieCenterTextPlugin, pieLabelLinePlugin]"
          :loading="false"
          @chart:render="onChartRender"
        />
      </div>
    </div>
    <!-- 分类列表 -->
    <div class="category-list">
      <div
        v-for="category in expenseCategoriesSimpView"
        :key="category.classify"
        class="category-item clickable"
        @click="$emit('category-click', category.classify, 0)"
      >
        <div class="category-info">
          <div
            class="category-color"
            :style="{ backgroundColor: category.color }"
          />
          <div class="category-name-with-count">
            <span class="category-name">{{ category.classify || '未分类' }}</span>
            <span class="category-count">{{ category.count }}笔</span>
          </div>
        </div>
        <div class="category-stats">
          <div class="category-amount">
            ¥{{ formatMoney(category.amount) }}
          </div>
          <div class="category-percent">
            {{ category.percent }}%
          </div>
        </div>
        <van-icon
          name="arrow"
          class="category-arrow"
        />
      </div>
      <!-- 展开/收起按钮 -->
      <div
        v-if="expenseCategoriesView.length > 1"
        class="expand-toggle"
        @click="showAllExpense = !showAllExpense"
      >
        <van-icon :name="showAllExpense ? 'arrow-up' : 'arrow-down'" />
      </div>
    </div>
    <ModernEmpty
      v-if="!expenseCategoriesView || !expenseCategoriesView.length"
      type="chart"
      theme="blue"
      title="暂无支出"
      description="本期还没有支出记录"
      size="small"
    />
  </div>
</template>

<script setup>
import { ref, computed } from 'vue'
import { getCssVar } from '@/utils/theme'
import ModernEmpty from '@/components/ModernEmpty.vue'
import BaseChart from '@/components/Charts/BaseChart.vue'
import { useChartTheme } from '@/composables/useChartTheme'
import { pieCenterTextPlugin } from '@/plugins/chartjs-pie-center-plugin'

const props = defineProps({
  categories: {
    type: Array,
    default: () => []
  },
  totalExpense: {
    type: Number,
    default: 0
  },
  colors: {
    type: Array,
    default: () => []
  }
})

defineEmits(['category-click'])

const showAllExpense = ref(false)

// Chart.js 相关
const { getChartOptions } = useChartTheme()
let _chartJSInstance = null

// 饼图标签引导线
const pieLabelLinePlugin = {
  id: 'pieLabelLine',
  afterDraw: (chart) => {
    const ctx = chart.ctx
    const meta = chart.getDatasetMeta(0)
    if (!meta?.data?.length) {return}

    const labels = chart.data.labels || []
    const centerX = (chart.chartArea.left + chart.chartArea.right) / 2
    const lineColor = getCssVar('--van-text-color-2') || '#8a8a8a'
    const textColor = getCssVar('--van-text-color') || '#323233'
    const strokeColor = getCssVar('--van-background-2') || '#ffffff'
    const minSpacing = 12
    const labelOffset = 18
    const lineOffset = 8
    const yPadding = 6

    const items = meta.data
      .map((arc, index) => {
        const label = labels[index]
        if (!label) {return null}
        const props = arc.getProps(['startAngle', 'endAngle', 'outerRadius', 'x', 'y'], true)
        const angle = (props.startAngle + props.endAngle) / 2
        const rawX = props.x + Math.cos(angle) * props.outerRadius
        const rawY = props.y + Math.sin(angle) * props.outerRadius
        const isRight = rawX >= centerX
        return {
          arc: props,
          label,
          angle,
          isRight,
          y: rawY
        }
      })
      .filter(Boolean)

    const left = items.filter((item) => !item.isRight).sort((a, b) => a.y - b.y)
    const right = items.filter((item) => item.isRight).sort((a, b) => a.y - b.y)

    const spread = (list) => {
      for (let i = 1; i < list.length; i++) {
        if (list[i].y - list[i - 1].y < minSpacing) {
          list[i].y = list[i - 1].y + minSpacing
        }
      }
    }

    const topLimit = chart.chartArea.top + yPadding
    const bottomLimit = chart.chartArea.bottom - yPadding
    const clampY = (value) => Math.min(bottomLimit, Math.max(topLimit, value))

    spread(left)
    spread(right)

    left.forEach((item) => { item.y = clampY(item.y) })
    right.forEach((item) => { item.y = clampY(item.y) })

    ctx.save()
    ctx.strokeStyle = lineColor
    ctx.lineWidth = 1
    ctx.fillStyle = textColor
    ctx.textBaseline = 'middle'
    ctx.font = 'bold 10px "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif'

    const drawItem = (item) => {
      const cos = Math.cos(item.angle)
      const sin = Math.sin(item.angle)
      const startX = item.arc.x + cos * (item.arc.outerRadius + 2)
      const startY = item.arc.y + sin * (item.arc.outerRadius + 2)
      const midX = item.arc.x + cos * (item.arc.outerRadius + lineOffset)
      const midY = item.arc.y + sin * (item.arc.outerRadius + lineOffset)
      const endX = item.arc.x + (item.isRight ? 1 : -1) * (item.arc.outerRadius + labelOffset)
      const endY = item.y

      ctx.strokeStyle = lineColor
      ctx.lineWidth = 1
      ctx.beginPath()
      ctx.moveTo(startX, startY)
      ctx.lineTo(midX, midY)
      ctx.lineTo(endX, endY)
      ctx.stroke()

      const textX = endX + (item.isRight ? 6 : -6)
      ctx.textAlign = item.isRight ? 'left' : 'right'
      ctx.fillStyle = textColor
      ctx.fillText(item.label, textX, endY)
    }

    left.forEach(drawItem)
    right.forEach(drawItem)

    ctx.restore()
  }
}

// 格式化金额
const formatMoney = (value) => {
  if (!value && value !== 0) {
    return '0'
  }
  return Number(value)
    .toFixed(0)
    .replace(/\B(?=(\d{3})+(?!\d))/g, ',')
}

// 计算属性
const expenseCategoriesView = computed(() => {
  const list = [...props.categories]
  const unclassifiedIndex = list.findIndex((c) => !c.classify)
  if (unclassifiedIndex !== -1) {
    const [unclassified] = list.splice(unclassifiedIndex, 1)
    list.unshift(unclassified)
  }
  return list
})

const expenseCategoriesSimpView = computed(() => {
  const list = expenseCategoriesView.value

  if (showAllExpense.value) {
    return list
  }

  const unclassified = list.filter((c) => c.classify === '未分类' || !c.classify)
  if (unclassified.length > 0) {
    return [...unclassified]
  }
  return []
})

// 准备图表数据（通用）
const prepareChartData = () => {
  const list = [...expenseCategoriesView.value]
  list.sort((a, b) => b.amount - a.amount)

  const MAX_SLICES = 8

  if (list.length > MAX_SLICES) {
    const topList = list.slice(0, MAX_SLICES - 1)
    const otherList = list.slice(MAX_SLICES - 1)
    const otherAmount = otherList.reduce((sum, item) => sum + item.amount, 0)

    const chartData = topList.map((item, index) => ({
      label: item.classify || '未分类',
      value: item.amount,
      color: props.colors[index % props.colors.length]
    }))

    chartData.push({
      label: '其他',
      value: otherAmount,
      color: getCssVar('--van-gray-6')
    })

    return chartData
  } else {
    return list.map((item, index) => ({
      label: item.classify || '未分类',
      value: item.amount,
      color: props.colors[index % props.colors.length]
    }))
  }
}

// Chart.js 数据
const chartData = computed(() => {
  const data = prepareChartData()

  return {
    labels: data.map((item) => item.label),
    datasets: [
      {
        data: data.map((item) => item.value),
        backgroundColor: data.map((item) => item.color),
        borderWidth: 2,
        borderColor: getCssVar('--van-background-2') || '#fff',
        hoverOffset: 8,
        borderRadius: 4,
        radius: '88%' // 拉大半径，减少上下留白
      }
    ]
  }
})

// 计算总金额
const totalAmount = computed(() => {
  return props.totalExpense || 0
})

// Chart.js 配置
const chartOptions = computed(() => {
  const isDarkMode = document.documentElement.getAttribute('data-theme') === 'dark'

  return getChartOptions({
    cutout: '65%',
    layout: {
      padding: {
        top: 0,
        bottom: 0,
        left: 2,
        right: 2
      }
    },
    plugins: {
      legend: {
        display: false
      },
      tooltip: {
        backgroundColor: getCssVar('--van-background-2'),
        titleColor: getCssVar('--van-text-color'),
        bodyColor: getCssVar('--van-text-color'),
        borderColor: getCssVar('--van-border-color'),
        borderWidth: 1,
        padding: 12,
        cornerRadius: 8,
        callbacks: {
          label: (context) => {
            const label = context.label || ''
            const value = context.parsed || 0
            const total = context.dataset.data.reduce((a, b) => a + b, 0)
            const percentage = total > 0 ? ((value / total) * 100).toFixed(1) : 0
            return `${label}: ¥${formatMoney(value)} (${percentage}%)`
          }
        }
      },
      pieCenterText: {
        text: `¥${formatMoney(totalAmount.value)}`,
        subtext: '总支出',
        textColor: isDarkMode ? '#ffffff' : '#323233',
        subtextColor: isDarkMode ? '#969799' : '#969799',
        fontSize: 24,
        subFontSize: 12
      },
      // 扇区外侧显示分类名称
      datalabels: {
        display: true
      }
    },
    // 悬停效果增强
    hoverOffset: 8
  })
})

// Chart.js 渲染完成回调
const onChartRender = (chart) => {
  _chartJSInstance = chart
}
</script>

<style scoped lang="scss">
@import '@/assets/theme.css';

.common-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg, 12px);
  padding: var(--spacing-xl, 16px);
  margin-bottom: var(--spacing-xl, 16px);
  box-shadow: var(--shadow-sm);
}

.expense-category-card .card-header {
  margin-bottom: 0;
}

.expense-category-card .chart-container {
  padding-bottom: 0;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
}

.card-title {
  font-size: var(--font-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin: 0;
}

.chart-container {
  padding: 0;
}

.ring-chart {
  position: relative;
  width: 100%;
  height: 170px;
  margin: 0px auto 0;
  overflow: visible;
}

.ring-chart :deep(.chartjs-size-monitor),
.ring-chart :deep(.chartjs-size-monitor-expand),
.ring-chart :deep(.chartjs-size-monitor-shrink) {
  display: none !important;
}

.ring-chart :deep(.base-chart) {
  height: 100%;
  min-height: 0;
  align-items: stretch;
  justify-content: flex-start;
}

.ring-chart :deep(canvas) {
  height: 100% !important;
  width: 100% !important;
}

.category-list {
  padding: 0;
}

.category-item {
  display: flex;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--van-border-color);
  transition: background-color 0.2s;
  gap: 12px;
}

.category-item:last-child {
  border-bottom: none;
}

.category-item.clickable {
  cursor: pointer;
}

.category-item.clickable:active {
  background-color: var(--van-background);
}

.category-info {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.category-name-with-count {
  display: flex;
  align-items: center;
  gap: 8px;
}

.category-color {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.category-name {
  font-size: 14px;
  color: var(--van-text-color);
}

.category-count {
  font-size: 12px;
  color: var(--van-text-color-3);
}

.category-stats {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.category-arrow {
  margin-left: 8px;
  color: var(--van-text-color-3);
  font-size: 16px;
  flex-shrink: 0;
}

.expand-toggle {
  display: flex;
  justify-content: center;
  align-items: center;
  padding-top: 10px;
  padding-bottom: 0;
  color: var(--van-text-color-3);
  font-size: 20px;
  cursor: pointer;
}

.expand-toggle:active {
  opacity: 0.7;
}

.category-amount {
  font-size: 15px;
  font-weight: 600;
  color: var(--van-text-color);
}

.category-percent {
  font-size: 12px;
  color: var(--van-text-color-3);
  background: var(--van-background);
  padding: 2px 8px;
  border-radius: 10px;
}
</style>