EmailBill/Web/src/views/StatisticsView.vue

<template>
  <div class="page-container">
    <!-- 顶部导航栏 -->
    <van-nav-bar title="账单统计" placeholder>
      <template #right>
        <van-icon name="chat-o" size="20" @click="goToAnalysis" />
      </template>
    </van-nav-bar>

    <!-- 下拉刷新 -->
    <van-pull-refresh v-model="refreshing" @refresh="onRefresh">
      <!-- 加载中 -->
      <van-loading v-if="loading" vertical style="padding: 100px 0">
        加载统计数据中...
      </van-loading>

      <!-- 统计内容 -->
      <div v-else class="statistics-content">
        <!-- 月份选择器 -->
        <div class="month-selector">
          <van-button 
            icon="arrow-left" 
            plain 
            size="small" 
            @click="changeMonth(-1)"
          />
          <div class="month-text" @click="showMonthPicker = true">
            {{ currentYear }}年{{ currentMonth }}月
            <van-icon name="arrow-down" />
          </div>
          <van-button 
            icon="arrow" 
            plain 
            size="small" 
            @click="changeMonth(1)"
            :disabled="isCurrentMonth"
          />
        </div>

        <!-- 月度概览卡片 -->
        <div class="overview-card">
          <div class="overview-item">
            <div class="label">总支出</div>
            <div class="value expense">¥{{ formatMoney(monthlyData.totalExpense) }}</div>
            <div class="sub-text">{{ monthlyData.expenseCount }}笔</div>
          </div>
          <div class="divider"></div>
          <div class="overview-item">
            <div class="label">总收入</div>
            <div class="value income">¥{{ formatMoney(monthlyData.totalIncome) }}</div>
            <div class="sub-text">{{ monthlyData.incomeCount }}笔</div>
          </div>
          <div class="divider"></div>
          <div class="overview-item">
            <div class="label">结余</div>
            <div class="value" :class="monthlyData.balance >= 0 ? 'income' : 'expense'">
              {{ monthlyData.balance >= 0 ? '' : '-' }}¥{{ formatMoney(Math.abs(monthlyData.balance)) }}
            </div>
            <div class="sub-text">{{ monthlyData.totalCount }}笔交易</div>
          </div>
        </div>

        <!-- 分类统计 -->
        <div class="common-card">
          <div class="card-header">
            <h3 class="card-title">支出分类统计</h3>
            <van-tag type="primary" size="medium">{{ expenseCategories.length }}类</van-tag>
          </div>
          
          <!-- 环形图区域 -->
          <div class="chart-container" v-if="expenseCategories.length > 0">
            <div class="ring-chart">
              <svg viewBox="0 0 200 200" class="ring-svg">
                <circle 
                  v-for="(segment, index) in chartSegments"
                  :key="index"
                  cx="100" 
                  cy="100" 
                  r="70"
                  fill="none"
                  :stroke="segment.color"
                  :stroke-width="35"
                  :stroke-dasharray="`${segment.length} ${circumference - segment.length}`"
                  :stroke-dashoffset="-segment.offset"
                  transform="rotate(-90 100 100)"
                  class="ring-segment"
                />
              </svg>
              <div class="ring-center">
                <div class="center-value">¥{{ formatMoney(monthlyData.totalExpense) }}</div>
                <div class="center-label">总支出</div>
              </div>
            </div>
          </div>

          <!-- 分类列表 -->
          <div class="category-list" v-if="expenseCategories.length > 0">
            <div 
              v-for="(category) in expenseCategories" 
              :key="category.classify"
              class="category-item"
            >
              <div class="category-info">
                <div class="category-color" :style="{ backgroundColor: category.color }"></div>
                <span class="category-name">{{ category.classify || '未分类' }}</span>
              </div>
              <div class="category-stats">
                <div class="category-amount">¥{{ formatMoney(category.amount) }}</div>
                <div class="category-percent">{{ category.percent }}%</div>
              </div>
            </div>
          </div>

          <van-empty 
            v-else
            description="本月暂无支出记录" 
            image="search"
          />
        </div>

        <!-- 收入分类统计 -->
        <div class="common-card" v-if="incomeCategories.length > 0">
          <div class="card-header">
            <h3 class="card-title">收入分类统计</h3>
            <van-tag type="success" size="medium">{{ incomeCategories.length }}类</van-tag>
          </div>
          
          <div class="category-list">
            <div 
              v-for="category in incomeCategories" 
              :key="category.classify"
              class="category-item"
            >
              <div class="category-info">
                <div class="category-color income-color"></div>
                <span class="category-name">{{ category.classify || '未分类' }}</span>
              </div>
              <div class="category-stats">
                <div class="category-amount income-text">¥{{ formatMoney(category.amount) }}</div>
                <div class="category-percent">{{ category.percent }}%</div>
              </div>
            </div>
          </div>
        </div>

        <!-- 趋势统计 -->
        <div class="common-card">
          <div class="card-header">
            <h3 class="card-title">近6个月趋势</h3>
          </div>
          
          <div class="trend-chart">
            <div class="trend-bars">
              <div 
                v-for="item in trendData" 
                :key="item.month"
                class="trend-bar-group"
              >
                <div class="bar-container">
                  <div 
                    class="bar expense-bar"
                    :style="{ height: getBarHeight(item.expense, maxTrendValue) }"
                  >
                    <div class="bar-value" v-if="item.expense > 0">
                      {{ formatShortMoney(item.expense) }}
                    </div>
                  </div>
                  <div 
                    class="bar income-bar"
                    :style="{ height: getBarHeight(item.income, maxTrendValue) }"
                  >
                    <div class="bar-value" v-if="item.income > 0">
                      {{ formatShortMoney(item.income) }}
                    </div>
                  </div>
                </div>
                <div class="bar-label">{{ item.label }}</div>
              </div>
            </div>
            
            <div class="trend-legend">
              <div class="legend-item">
                <div class="legend-color expense-color"></div>
                <span>支出</span>
              </div>
              <div class="legend-item">
                <div class="legend-color income-color"></div>
                <span>收入</span>
              </div>
            </div>
          </div>
        </div>

        <!-- 其他统计 -->
        <div class="common-card">
          <div class="card-header">
            <h3 class="card-title">其他统计</h3>
          </div>
          
          <div class="other-stats">
            <div class="stat-item">
              <div class="stat-label">日均支出</div>
              <div class="stat-value">¥{{ formatMoney(dailyAverage.expense) }}</div>
            </div>
            <div class="stat-item">
              <div class="stat-label">日均收入</div>
              <div class="stat-value income-text">¥{{ formatMoney(dailyAverage.income) }}</div>
            </div>
            <div class="stat-item">
              <div class="stat-label">最大单笔支出</div>
              <div class="stat-value">¥{{ formatMoney(monthlyData.maxExpense) }}</div>
            </div>
            <div class="stat-item">
              <div class="stat-label">最大单笔收入</div>
              <div class="stat-value income-text">¥{{ formatMoney(monthlyData.maxIncome) }}</div>
            </div>
          </div>
        </div>

        <!-- 底部安全距离 -->
        <div style="height: calc(50px + env(safe-area-inset-bottom, 0px))"></div>
      </div>
    </van-pull-refresh>

    <!-- 月份选择器 -->
    <van-popup v-model:show="showMonthPicker" position="bottom" round>
      <van-date-picker
        v-model="selectedDate"
        title="选择月份"
        :min-date="minDate"
        :max-date="maxDate"
        :columns-type="['year', 'month']"
        @confirm="onMonthConfirm"
        @cancel="showMonthPicker = false"
      />
    </van-popup>
  </div>
</template>

<script setup>
import { ref, computed, onMounted } from 'vue'
import { showToast } from 'vant'
import { useRouter } from 'vue-router'
import { getMonthlyStatistics, getCategoryStatistics, getTrendStatistics } from '@/api/statistics'

const router = useRouter()

// 响应式数据
const loading = ref(true)
const refreshing = ref(false)
const showMonthPicker = ref(false)
const currentYear = ref(new Date().getFullYear())
const currentMonth = ref(new Date().getMonth() + 1)
const selectedDate = ref([new Date().getFullYear().toString(), (new Date().getMonth() + 1).toString().padStart(2, '0')])

// 月度数据
const monthlyData = ref({
  totalExpense: 0,
  totalIncome: 0,
  balance: 0,
  expenseCount: 0,
  incomeCount: 0,
  totalCount: 0,
  maxExpense: 0,
  maxIncome: 0
})

// 分类数据
const expenseCategories = ref([])
const incomeCategories = ref([])

// 趋势数据
const trendData = ref([])

// 日期范围
const minDate = new Date(2020, 0, 1)
const maxDate = new Date()

// 颜色配置
const colors = [
  '#FF6B6B', '#4ECDC4', '#45B7D1', '#FFA07A', '#98D8C8',
  '#F7DC6F', '#BB8FCE', '#85C1E2', '#F8B88B', '#AAB7B8',
  '#FF8ED4', '#67E6DC', '#FFAB73', '#C9B1FF', '#7BDFF2'
]

// 计算环形图数据
const circumference = computed(() => 2 * Math.PI * 70)
const chartSegments = computed(() => {
  let offset = 0
  return expenseCategories.value.map((category) => {
    const percent = category.percent / 100
    const length = circumference.value * percent
    const segment = {
      color: category.color,
      length,
      offset
    }
    offset += length
    return segment
  })
})

// 日均统计
const dailyAverage = computed(() => {
  const daysInMonth = new Date(currentYear.value, currentMonth.value, 0).getDate()
  return {
    expense: monthlyData.value.totalExpense / daysInMonth,
    income: monthlyData.value.totalIncome / daysInMonth
  }
})

// 趋势图最大值
const maxTrendValue = computed(() => {
  const allValues = trendData.value.flatMap(item => [item.expense, item.income])
  return Math.max(...allValues, 1)
})

// 是否是当前月
const isCurrentMonth = computed(() => {
  const now = new Date()
  return currentYear.value === now.getFullYear() && currentMonth.value === now.getMonth() + 1
})

// 格式化金额
const formatMoney = (value) => {
  if (!value && value !== 0) return '0.00'
  return Number(value).toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ',')
}

// 格式化短金额（k为单位）
const formatShortMoney = (value) => {
  if (!value) return '0'
  if (value >= 10000) {
    return (value / 10000).toFixed(1) + 'w'
  }
  if (value >= 1000) {
    return (value / 1000).toFixed(1) + 'k'
  }
  return value.toFixed(0)
}

// 获取柱状图高度
const getBarHeight = (value, maxValue) => {
  if (!value || !maxValue) return '0%'
  const percent = (value / maxValue) * 100
  return Math.max(percent, 5) + '%' // 最小5%以便显示
}

// 切换月份
const changeMonth = (offset) => {
  let newMonth = currentMonth.value + offset
  let newYear = currentYear.value

  if (newMonth > 12) {
    newMonth = 1
    newYear++
  } else if (newMonth < 1) {
    newMonth = 12
    newYear--
  }

  // 不能超过当前月份
  const now = new Date()
  const targetDate = new Date(newYear, newMonth - 1)
  if (targetDate > now) {
    return
  }

  currentYear.value = newYear
  currentMonth.value = newMonth
  fetchStatistics()
}

// 确认月份选择
const onMonthConfirm = ({ selectedValues }) => {
  currentYear.value = parseInt(selectedValues[0])
  currentMonth.value = parseInt(selectedValues[1])
  showMonthPicker.value = false
  fetchStatistics()
}

// 下拉刷新
const onRefresh = async () => {
  await fetchStatistics()
  refreshing.value = false
}

// 获取统计数据
const fetchStatistics = async () => {
  loading.value = true
  try {
    await Promise.all([
      fetchMonthlyData(),
      fetchCategoryData(),
      fetchTrendData()
    ])
  } catch (error) {
    console.error('获取统计数据失败:', error)
    showToast('获取统计数据失败')
  } finally {
    loading.value = false
  }
}

// 获取月度数据
const fetchMonthlyData = async () => {
  try {
    const response = await getMonthlyStatistics({
      year: currentYear.value,
      month: currentMonth.value
    })

    if (response.success && response.data) {
      monthlyData.value = response.data
    }
  } catch (error) {
    console.error('获取月度数据失败:', error)
    showToast('获取月度数据失败')
  }
}

// 获取分类数据
const fetchCategoryData = async () => {
  try {
    // 获取支出分类
    const expenseResponse = await getCategoryStatistics({
      year: currentYear.value,
      month: currentMonth.value,
      type: 0 // 支出
    })

    if (expenseResponse.success && expenseResponse.data) {
      expenseCategories.value = expenseResponse.data.map((item, index) => ({
        classify: item.classify,
        amount: item.amount,
        percent: item.percent,
        color: colors[index % colors.length]
      }))
    }

    // 获取收入分类
    const incomeResponse = await getCategoryStatistics({
      year: currentYear.value,
      month: currentMonth.value,
      type: 1 // 收入
    })

    if (incomeResponse.success && incomeResponse.data) {
      incomeCategories.value = incomeResponse.data.map(item => ({
        classify: item.classify,
        amount: item.amount,
        percent: item.percent
      }))
    }
  } catch (error) {
    console.error('获取分类数据失败:', error)
    showToast('获取分类数据失败')
  }
}

// 获取趋势数据
const fetchTrendData = async () => {
  try {
    // 计算开始年月（当前月往前推5个月）
    let startYear = currentYear.value
    let startMonth = currentMonth.value - 5
    
    if (startMonth <= 0) {
      startMonth += 12
      startYear--
    }
    
    const response = await getTrendStatistics({
      startYear,
      startMonth,
      monthCount: 6
    })
    
    if (response.success && response.data) {
      trendData.value = response.data.map(item => ({
        year: item.year,
        month: item.month,
        label: `${item.month}月`,
        expense: item.expense,
        income: item.income
      }))
    }
  } catch (error) {
    console.error('获取趋势数据失败:', error)
    showToast('获取趋势数据失败')
  }
}

// 跳转到智能分析页面
const goToAnalysis = () => {
  router.push('/bill-analysis')
}

// 初始化
onMounted(() => {
  fetchStatistics()
})
</script>

<style scoped>
.statistics-content {
  padding: 16px 0 0 0;
}

/* 月份选择器 */
.month-selector {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  margin: 0 12px 16px;
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  .month-selector {
    background: #1f1f1f;
  }
}

.month-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--van-text-color);
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  user-select: none;
}

/* 月度概览卡片 */
.overview-card {
  display: flex;
  justify-content: space-around;
  align-items: center;
  background: #ffffff;
  margin: 0 12px 16px;
  padding: 24px 12px;
  border-radius: 16px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  border: 1px solid #ebedf0;
}

@media (prefers-color-scheme: dark) {
  .overview-card {
    background: #1f1f1f;
    border-color: #2c2c2c;
  }
}

.overview-item {
  flex: 1;
  text-align: center;
}

.overview-item .label {
  font-size: 13px;
  color: var(--van-text-color-2);
  margin-bottom: 8px;
}

.overview-item .value {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 4px;
}

.overview-item .sub-text {
  font-size: 12px;
  color: var(--van-text-color-3);
}

.divider {
  width: 1px;
  height: 40px;
  background: var(--van-border-color);
}

.expense {
  color: #ff6b6b;
}

.income {
  color: #51cf66;
}

/* 环形图 */
.chart-container {
  padding: 20px;
}

.ring-chart {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto;
}

.ring-svg {
  width: 100%;
  height: 100%;
  transform: scale(1);
}

.ring-segment {
  transition: all 0.3s ease;
}

.ring-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.center-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--van-text-color);
  margin-bottom: 4px;
}

.center-label {
  font-size: 13px;
  color: var(--van-text-color-2);
}

/* 分类列表 */
.category-list {
  padding: 0;
}

.category-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid #ebedf0;
}

@media (prefers-color-scheme: dark) {
  .category-item {
    border-bottom: 1px solid #2c2c2c;
  }
}

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

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

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

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

.category-stats {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
}

.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: #f7f8fa;
  padding: 2px 8px;
  border-radius: 10px;
}

@media (prefers-color-scheme: dark) {
  .category-percent {
    background: #141414;
  }
}

.income-color {
  background-color: #51cf66;
}

.income-text {
  color: #51cf66;
}

.expense-color {
  background-color: #ff6b6b;
}

/* 趋势图 */
.trend-chart {
  padding: 20px 16px;
}

.trend-bars {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  height: 180px;
  margin-bottom: 16px;
  padding: 0 4px;
}

.trend-bar-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.bar-container {
  width: 100%;
  height: 150px;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  gap: 4px;
  padding: 0 2px;
}

.bar {
  flex: 1;
  max-width: 20px;
  min-height: 4px;
  border-radius: 4px 4px 0 0;
  position: relative;
  transition: all 0.3s ease;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.expense-bar {
  background: linear-gradient(180deg, #ff6b6b 0%, #ff8787 100%);
}

.income-bar {
  background: linear-gradient(180deg, #51cf66 0%, #69db7c 100%);
}

.bar-value {
  font-size: 10px;
  color: var(--van-text-color-2);
  white-space: nowrap;
  margin-top: -18px;
}

.bar-label {
  font-size: 11px;
  color: var(--van-text-color-3);
}

.trend-legend {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding-top: 12px;
  border-top: 1px solid #ebedf0;
}

@media (prefers-color-scheme: dark) {
  .trend-legend {
    border-top: 1px solid #2c2c2c;
  }
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--van-text-color-2);
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

/* 其他统计 */
.other-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  padding: 16px;
}

.stat-item {
  background: #f7f8fa;
  padding: 16px;
  border-radius: 12px;
  text-align: center;
}

@media (prefers-color-scheme: dark) {
  .stat-item {
    background: #141414;
  }
}

.stat-label {
  font-size: 13px;
  color: var(--van-text-color-2);
  margin-bottom: 8px;
}

.stat-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--van-text-color);
}

</style>