EmailBill/Web/src/views/StatisticsView.vue

<template>
  <div class="page-container-flex">
    <!-- 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"
    >
      <!-- 初始加载中 -->
      <van-loading
        v-if="loading && firstLoading"
        vertical
        style="padding: 100px 0"
      >
        加载统计数据中...
      </van-loading>

      <!-- 固定概览部分（置顶不滚动） -->
      <div
        v-if="!firstLoading"
        class="overview-fixed-wrapper"
      >
        <transition
          :name="transitionName"
          mode="out-in"
        >
          <div :key="dateKey">
            <!-- 月度概览卡片 -->
            <div class="overview-card">
              <!-- 左切换按钮 -->
              <div
                class="nav-arrow left"
                @click.stop="changeMonth(-1)"
              >
                <van-icon name="arrow-left" />
              </div>

              <div
                class="overview-item clickable"
                @click="goToTypeOverviewBills(0)"
              >
                <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
                class="overview-item clickable"
                @click="goToTypeOverviewBills(1)"
              >
                <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
                class="overview-item clickable"
                @click="goToTypeOverviewBills(null)"
              >
                <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>

              <!-- 右切换按钮 -->
              <div
                class="nav-arrow right"
                :class="{ disabled: isCurrentMonth }"
                :aria-disabled="isCurrentMonth"
                @click.stop="!isCurrentMonth && changeMonth(1)"
              >
                <van-icon name="arrow" />
              </div>

              <!-- 月份日期标识 -->
              <div
                class="date-tag"
                @click="showMonthPicker = true"
              >
                {{ dateTagLabel }}
                <van-icon name="arrow-down" />
              </div>
            </div>
          </div>
        </transition>
      </div>

      <!-- 统计内容（可滚动部分） -->
      <div
        v-if="!firstLoading"
        class="statistics-content"
      >
        <transition
          :name="transitionName"
          mode="out-in"
        >
          <div :key="dateKey">
            <!-- 趋势统计 -->
            <div
              class="common-card"
              style="padding-bottom: 5px"
            >
              <div class="card-header">
                <h3 class="card-title">
                  收支趋势
                </h3>
              </div>

              <div
                class="trend-chart"
                style="height: 240px; padding: 10px 0"
              >
                <div
                  ref="chartRef"
                  style="width: 100%; height: 100%"
                />
              </div>
            </div>
            <!-- 分类统计 -->
            <div
              class="common-card"
              style="padding-bottom: 10px;"
            >
              <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">
                  <div
                    ref="pieChartRef"
                    style="width: 100%; height: 100%"
                  />
                </div>
              </div>
              <!-- 分类列表 -->
              <div
                class="category-list"
              >
                <div
                  v-for="category in expenseCategoriesSimpView"
                  :key="category.classify"
                  class="category-item clickable"
                  @click="goToCategoryBills(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>
              <van-empty
                v-if="!expenseCategoriesView || !expenseCategoriesView.length"
                description="本月暂无支出记录"
                image="search"
              />
            </div>
            <!-- 收入分类统计 -->
            <div
              v-if="incomeCategoriesView.length > 0"
              class="common-card"
            >
              <div class="card-header">
                <h3 class="card-title">
                  收入分类统计
                </h3>
                <van-tag
                  type="success"
                  size="medium"
                >
                  {{ incomeCategoriesView.length }}类
                </van-tag>
              </div>

              <div class="category-list">
                <div
                  v-for="category in incomeCategoriesView"
                  :key="category.classify"
                  class="category-item clickable"
                  @click="goToCategoryBills(category.classify, 1)"
                >
                  <div class="category-info">
                    <div class="category-color income-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 income-text">
                      ¥{{ formatMoney(category.amount) }}
                    </div>
                    <div class="category-percent">
                      {{ category.percent }}%
                    </div>
                  </div>
                  <van-icon
                    name="arrow"
                    class="category-arrow"
                  />
                </div>
              </div>
            </div>
            <!-- 不计收支分类统计 -->
            <div
              v-if="noneCategoriesView.length > 0"
              class="common-card"
            >
              <div class="card-header">
                <h3 class="card-title">
                  不计收支分类统计
                </h3>
                <van-tag
                  type="warning"
                  size="medium"
                >
                  {{ noneCategoriesView.length }}类
                </van-tag>
              </div>

              <div class="category-list">
                <div
                  v-for="category in noneCategoriesView"
                  :key="category.classify"
                  class="category-item clickable"
                  @click="goToCategoryBills(category.classify, 2)"
                >
                  <div class="category-info">
                    <div class="category-color none-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 none-text">
                      ¥{{ formatMoney(category.amount) }}
                    </div>
                    <div class="category-percent">
                      {{ category.percent }}%
                    </div>
                  </div>
                  <van-icon
                    name="arrow"
                    class="category-arrow"
                  />
                </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>
        </transition>
      </div>
    </van-pull-refresh>

    <!-- 月份选择器 -->
    <van-popup
      v-model:show="showMonthPicker"
      position="bottom"
      round
      teleport="body"
    >
      <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>

    <!-- 分类账单列表弹出层 -->
    <PopupContainer
      v-model="billListVisible"
      :title="selectedCategoryTitle"
      :subtitle="categoryBillsTotal ? `共 ${categoryBillsTotal} 笔交易` : ''"
      height="75%"
    >
      <template #header-actions>
        <SmartClassifyButton
          v-if="isUnclassified"
          ref="smartClassifyButtonRef"
          :transactions="categoryBills"
          :on-before-classify="beforeSmartClassify"
          @save="onSmartClassifySave"
          @notify-doned-transaction-id="handleNotifiedTransactionId"
        />
      </template>

      <TransactionList
        ref="transactionListRef"
        :transactions="categoryBills"
        :loading="billListLoading"
        :finished="billListFinished"
        :show-delete="true"
        @load="loadCategoryBills"
        @click="viewBillDetail"
        @delete="handleCategoryBillsDelete"
      />
    </PopupContainer>

    <!-- 交易详情编辑组件 -->
    <TransactionDetail
      v-model:show="detailVisible"
      :transaction="currentTransaction"
      @save="onBillSave"
    />
  </div>
</template>

<script setup>
import { ref, computed, onMounted, onActivated, nextTick, watch } from 'vue'
import { onBeforeUnmount } from 'vue'
import { showToast } from 'vant'
import { useRouter } from 'vue-router'
import { getMonthlyStatistics, getCategoryStatistics, getDailyStatistics } from '@/api/statistics'
import * as echarts from 'echarts'
import { getTransactionList, getTransactionDetail } from '@/api/transactionRecord'
import TransactionList from '@/components/TransactionList.vue'
import TransactionDetail from '@/components/TransactionDetail.vue'
import SmartClassifyButton from '@/components/SmartClassifyButton.vue'
import PopupContainer from '@/components/PopupContainer.vue'

const router = useRouter()

// 响应式数据
const loading = ref(true)
const firstLoading = ref(true)
const refreshing = ref(false)
const showMonthPicker = ref(false)
const showAllExpense = 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')
])

const transitionName = ref('slide-right')
const dateKey = computed(() => `${currentYear.value}-${currentMonth.value}`)

// 账单列表相关
const billListVisible = ref(false)
const billListLoading = ref(false)
const billListFinished = ref(false)
const categoryBills = ref([])
const categoryBillsTotal = ref(0)
const selectedCategoryTitle = ref('')
const selectedClassify = ref('')
const selectedType = ref(null)
const billPageIndex = ref(1)
const billPageSize = 20

// 详情编辑相关
const detailVisible = ref(false)
const currentTransaction = ref(null)

// 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([])
const noneCategories = ref([])

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

  if (showAllExpense.value) {
    return list
  }

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

const expenseCategoriesView = computed(() => {
  const list = [...expenseCategories.value]
  const unclassifiedIndex = list.findIndex((c) => !c.classify)
  if (unclassifiedIndex !== -1) {
    const [unclassified] = list.splice(unclassifiedIndex, 1)
    list.unshift(unclassified)
  }

  return list
})

const incomeCategoriesView = computed(() => {
  const list = [...incomeCategories.value]
  const unclassifiedIndex = list.findIndex((c) => !c.classify)
  if (unclassifiedIndex !== -1) {
    const [unclassified] = list.splice(unclassifiedIndex, 1)
    list.unshift(unclassified)
  }

  return list
})

const noneCategoriesView = computed(() => {
  const list = [...noneCategories.value]
  const unclassifiedIndex = list.findIndex((c) => !c.classify)
  if (unclassifiedIndex !== -1) {
    const [unclassified] = list.splice(unclassifiedIndex, 1)
    list.unshift(unclassified)
  }

  return list
})

// 趋势数据
const dailyData = ref([])
const chartRef = ref(null)
const pieChartRef = ref(null)
let chartInstance = null
let pieChartInstance = null

// 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'
]

// 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
  }
})

// 日均统计
const isCurrentMonth = computed(() => {
  const now = new Date()
  return currentYear.value === now.getFullYear() && currentMonth.value === now.getMonth() + 1
})

// 日期标签展示文字
const dateTagLabel = computed(() => {
  const now = new Date()
  const todayYear = now.getFullYear()
  const todayMonth = now.getMonth() + 1

  if (currentYear.value === todayYear && currentMonth.value === todayMonth) {
    return '本月'
  }

  // 计算上个月
  let lastYear = todayYear
  let lastMonth = todayMonth - 1
  if (lastMonth === 0) {
    lastMonth = 12
    lastYear--
  }

  if (currentYear.value === lastYear && currentMonth.value === lastMonth) {
    return '上月'
  }

  return `${currentYear.value}年${currentMonth.value}月`
})

// 是否为未分类账单
const isUnclassified = computed(() => {
  return selectedClassify.value === '未分类' || selectedClassify.value === ''
})

// 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, ',')
}

// 切换月份
const changeMonth = (offset) => {
  transitionName.value = offset > 0 ? 'slide-left' : 'slide-right'
  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

  // 重置展开状态
  showAllExpense.value = false

  fetchStatistics()
}

// 确认月份选择
const onMonthConfirm = ({ selectedValues }) => {
  const newYear = parseInt(selectedValues[0])
  const newMonth = parseInt(selectedValues[1])

  // 判断方向以应用动画
  if (
    newYear > currentYear.value ||
    (newYear === currentYear.value && newMonth > currentMonth.value)
  ) {
    transitionName.value = 'slide-left'
  } else {
    transitionName.value = 'slide-right'
  }

  currentYear.value = newYear
  currentMonth.value = newMonth
  showMonthPicker.value = false

  // 重置展开状态
  showAllExpense.value = false

  fetchStatistics()
}

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

// 获取统计数据
const fetchStatistics = async (showLoading = true) => {
  if (showLoading && firstLoading.value) {
    loading.value = true
  }

  try {
    await Promise.all([fetchMonthlyData(), fetchCategoryData(), fetchDailyData()])
  } 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
    firstLoading.value = false
    // DOM 更新后渲染图表
    nextTick(() => {
      renderChart(dailyData.value)
      renderPieChart()
    })
  }
}

// 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,
        count: item.count,
        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,
        count: item.count,
        percent: item.percent
      }))
    }

    // 获取不计收支分类
    const noneResponse = await getCategoryStatistics({
      year: currentYear.value,
      month: currentMonth.value,
      type: 2 // 不计收支
    })

    if (noneResponse.success && noneResponse.data) {
      noneCategories.value = noneResponse.data.map((item) => ({
        classify: item.classify,
        amount: item.amount,
        count: item.count,
        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')
  }
}

// 获取每日统计数据并渲染图表
const fetchDailyData = async () => {
  try {
    const response = await getDailyStatistics({
      year: currentYear.value,
      month: currentMonth.value
    })

    if (response.success && response.data) {
      dailyData.value = response.data
      // 如果不是首次加载（即DOM已存在），直接渲染
      if (!firstLoading.value) {
        nextTick(() => {
          renderChart(response.data)
        })
      }
    }
  } catch (error) {
    console.error('获取每日统计数据失败:', error)
    showToast('获取每日统计数据失败')
  }
}

const renderChart = (data) => {
  if (!chartRef.value) {
    return
  }

  // 尝试获取DOM上的现有实例
  const existingInstance = echarts.getInstanceByDom(chartRef.value)

  // 如果当前保存的实例与DOM不一致，或者DOM上已经有实例但我们没保存引用
  if (chartInstance && chartInstance !== existingInstance) {
    // 这种情况很少见，但为了保险，销毁旧的引用
    if (!chartInstance.isDisposed()) {
      chartInstance.dispose()
    }
    chartInstance = null
  }

  // 如果DOM变了（transition导致的），旧的chartInstance绑定的DOM已经不在了
  // 这时 chartInstance.getDom() !== chartRef.value
  if (chartInstance && chartInstance.getDom() !== chartRef.value) {
    chartInstance.dispose()
    chartInstance = null
  }

  // 如果DOM上已经有实例（可能由其他途径创建），复用它
  if (!chartInstance && existingInstance) {
    chartInstance = existingInstance
  }

  if (!chartInstance) {
    chartInstance = echarts.init(chartRef.value)
  }

  // 补全当月所有日期
  const now = new Date()
  let daysInMonth

  if (currentYear.value === now.getFullYear() && currentMonth.value === now.getMonth() + 1) {
    // 如果是当前月，只显示到今天
    daysInMonth = now.getDate()
  } else {
    // 如果是过去月，显示整月
    daysInMonth = new Date(currentYear.value, currentMonth.value, 0).getDate()
  }

  const fullData = []

  // 创建日期映射
  const dataMap = new Map()
  data.forEach((item) => {
    const day = new Date(item.date).getDate()
    dataMap.set(day, item)
  })

  for (let i = 1; i <= daysInMonth; i++) {
    const item = dataMap.get(i)
    if (item) {
      fullData.push(item)
    } else {
      fullData.push({
        date: `${currentYear.value}-${String(currentMonth.value).padStart(2, '0')}-${String(i).padStart(2, '0')}`,
        count: 0,
        expense: 0,
        income: 0,
        balance: 0
      })
    }
  }

  const dates = fullData.map((item) => {
    const date = new Date(item.date)
    return `${date.getDate()}日`
  })

  // Calculate cumulative values
  let accumulatedExpense = 0
  let accumulatedIncome = 0
  let accumulatedBalance = 0

  const expenses = fullData.map((item) => {
    accumulatedExpense += item.expense
    return accumulatedExpense
  })

  const incomes = fullData.map((item) => {
    accumulatedIncome += item.income
    return accumulatedIncome
  })

  const balances = fullData.map((item) => {
    accumulatedBalance += item.balance
    return accumulatedBalance
  })

  const option = {
    tooltip: {
      trigger: 'axis',
      formatter: function (params) {
        let result = params[0].name + '<br/>'
        params.forEach((param) => {
          result += param.marker + param.seriesName + ': ' + formatMoney(param.value) + '<br/>'
        })
        return result
      }
    },
    legend: {
      data: ['支出', '收入', '存款'],
      bottom: 0,
      textStyle: {
        color: '#999' // 适配深色模式
      }
    },
    grid: {
      left: '3%',
      right: '4%',
      bottom: '15%',
      top: '5%',
      containLabel: true
    },
    xAxis: {
      type: 'category',
      boundaryGap: false,
      data: dates,
      axisLabel: {
        color: '#999' // 适配深色模式
      }
    },
    yAxis: {
      type: 'value',
      splitNumber: 5,
      axisLabel: {
        color: '#999', // 适配深色模式
        formatter: (value) => {
          return value / 1000 + 'k'
        }
      },
      splitLine: {
        lineStyle: {
          type: 'dashed',
          color: '#333' // 深色分割线
        }
      }
    },
    series: [
      {
        name: '支出',
        type: 'line',
        data: expenses,
        itemStyle: { color: '#FF6B6B' },
        showSymbol: false,
        smooth: true,
        lineStyle: { width: 2 }
      },
      {
        name: '收入',
        type: 'line',
        data: incomes,
        itemStyle: { color: '#4ECDC4' },
        showSymbol: false,
        smooth: true,
        lineStyle: { width: 2 }
      },
      {
        name: '存款',
        type: 'line',
        data: balances,
        itemStyle: { color: '#FFAB73' },
        showSymbol: false,
        smooth: true,
        lineStyle: { width: 2 }
      }
    ]
  }

  chartInstance.setOption(option)
}

const renderPieChart = () => {
  if (!pieChartRef.value) {
    return
  }
  if (expenseCategoriesView.value.length === 0) {
    return
  }

  // 尝试获取DOM上的现有实例
  const existingInstance = echarts.getInstanceByDom(pieChartRef.value)

  if (pieChartInstance && pieChartInstance !== existingInstance) {
    if (!pieChartInstance.isDisposed()) {
      pieChartInstance.dispose()
    }
    pieChartInstance = null
  }

  if (pieChartInstance && pieChartInstance.getDom() !== pieChartRef.value) {
    pieChartInstance.dispose()
    pieChartInstance = null
  }

  if (!pieChartInstance && existingInstance) {
    pieChartInstance = existingInstance
  }

  if (!pieChartInstance) {
    pieChartInstance = echarts.init(pieChartRef.value)
  }

  // 使用 Top N + Other 的数据逻辑，确保图表不会太拥挤
  const list = [...expenseCategoriesView.value]
  let chartData = []

  // 按照金额排序
  list.sort((a, b) => b.amount - a.amount)

  if (list.length > 0) {
    chartData = list.map((item, index) => ({
      value: item.amount,
      name: item.classify || '未分类',
      itemStyle: { color: colors[index % colors.length] }
    }))
  }

  const option = {
    title: {
      text: '¥' + formatMoney(monthlyData.value.totalExpense),
      subtext: '总支出',
      left: 'center',
      top: 'center',
      textStyle: {
        color: '#fff', // 适配深色模式
        fontSize: 20,
        fontWeight: 'bold'
      },
      subtextStyle: {
        color: '#999',
        fontSize: 13
      }
    },
    tooltip: {
      trigger: 'item',
      formatter: '{b}: {c} ({d}%)'
    },
    series: [
      {
        name: '支出分类',
        type: 'pie',
        radius: ['50%', '80%'],
        avoidLabelOverlap: true,
        minAngle: 5, // 最小扇区角度，防止扇区太小看不见
        itemStyle: {
          borderRadius: 5,
          borderColor: '#1a1a1a',
          borderWidth: 2
        },
        label: {
          show: true,
          position: 'outside',
          formatter: '{b}',
          color: '#ccc', // 适配深色模式
          overflow: 'none' // 禁止文本截断
        },
        labelLine: {
          show: true,
          lineStyle: {
            color: '#666'
          }
        },
        data: chartData
      }
    ]
  }

  pieChartInstance.setOption(option)
}

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

// 打开分类账单列表
const goToCategoryBills = (classify, type) => {
  selectedClassify.value = classify || '未分类' // TODO 如果是未分类的 添加智能分类按钮
  selectedType.value = type
  selectedCategoryTitle.value = `${classify || '未分类'} - ${type === 0 ? '支出' : '收入'}`

  // 重置分页状态
  categoryBills.value = []
  categoryBillsTotal.value = 0
  billPageIndex.value = 1
  billListFinished.value = false

  billListVisible.value = true
  // 打开弹窗后加载数据
  loadCategoryBills()
}

// 打开总支出/总收入的所有账单列表
const goToTypeOverviewBills = (type) => {
  selectedClassify.value = null
  selectedType.value = type
  selectedCategoryTitle.value = `${type === 0 ? '总支出' : '总收入'} - 明细`

  // 重置分页状态
  categoryBills.value = []
  billPageIndex.value = 1
  billListFinished.value = false

  billListVisible.value = true
  // 打开弹窗后加载数据
  loadCategoryBills()
}

const smartClassifyButtonRef = ref(null)
const transactionListRef = ref(null)
// 加载分类账单数据
const loadCategoryBills = async (customIndex = null, customSize = null) => {
  if (billListLoading.value || billListFinished.value) {
    return
  }

  billListLoading.value = true
  try {
    const params = {
      pageIndex: customIndex || billPageIndex.value,
      pageSize: customSize || billPageSize,
      type: selectedType.value,
      year: currentYear.value,
      month: currentMonth.value,
      sortByAmount: true
    }

    // 仅当选择了分类时才添加classify参数
    if (selectedClassify.value !== null) {
      params.classify = selectedClassify.value
    }

    const response = await getTransactionList(params)

    if (response.success) {
      const newList = response.data || []
      categoryBills.value = [...categoryBills.value, ...newList]
      categoryBillsTotal.value = response.total

      if (newList.length === 0 || newList.length < billPageSize) {
        billListFinished.value = true
      } else {
        billListFinished.value = false
        billPageIndex.value++
      }

      smartClassifyButtonRef.value?.reset()
    } else {
      showToast(response.message || '加载账单失败')
      billListFinished.value = true
    }
  } catch (error) {
    console.error('加载分类账单失败:', error)
    showToast('加载账单失败')
    billListFinished.value = true
  } finally {
    billListLoading.value = false
  }
}

// 查看账单详情
const viewBillDetail = async (transaction) => {
  try {
    const response = await getTransactionDetail(transaction.id)
    if (response.success) {
      currentTransaction.value = response.data
      detailVisible.value = true
    } else {
      showToast(response.message || '获取详情失败')
    }
  } catch (error) {
    console.error('获取详情出错:', error)
    showToast('获取详情失败')
  }
}

const handleCategoryBillsDelete = (deletedId) => {
  categoryBills.value = categoryBills.value.filter((t) => t.id !== deletedId)
  categoryBillsTotal.value--

  // 被删除后刷新统计数据和账单列表
  fetchStatistics()
}

// 账单保存后的回调
const onBillSave = async (updatedTransaction) => {
  // 刷新统计数据
  await fetchStatistics()

  // 只刷新列表中指定的账单项
  const item = categoryBills.value.find((t) => t.id === updatedTransaction.id)
  if (!item) {
    return
  }

  // 如果分类发生了变化
  if (item.classify !== updatedTransaction.classify) {
    // 从列表中移除该项
    categoryBills.value = categoryBills.value.filter((t) => t.id !== updatedTransaction.id)
    categoryBillsTotal.value--
    // 通知智能分类按钮组件移除指定项
    smartClassifyButtonRef.value?.removeClassifiedTransaction(updatedTransaction.id)
    return
  }

  Object.assign(item, updatedTransaction)

  showToast('保存成功')
}

const beforeSmartClassify = async () => {
  showToast({
    message: '加载完整账单列表，请稍候...',
    duration: 0,
    forbidClick: true
  })

  await loadCategoryBills(1, categoryBillsTotal.value || 1000)
}

// 智能分类保存后的回调
const onSmartClassifySave = async () => {
  // 关闭账单列表弹窗
  billListVisible.value = false

  // 刷新统计数据
  await fetchStatistics()
  try {
    window.dispatchEvent(
      new CustomEvent('transactions-changed', {
        detail: { reason: selectedClassify.value, type: selectedType.value }
      })
    )
  } catch (e) {
    console.error('触发 transactions-changed 事件失败:', e)
  }

  showToast('智能分类已保存')
}

const handleNotifiedTransactionId = async (transactionId) => {
  console.log('收到已处理交易ID通知:', transactionId)
  // 滚动到指定的交易项
  const index = categoryBills.value.findIndex((item) => String(item.id) === String(transactionId))
  if (index !== -1) {
    // 等待 DOM 更新
    await nextTick()

    // 允许一丁点延迟让浏览器响应渲染
    await new Promise((resolve) => setTimeout(resolve, 0))

    const listElement = transactionListRef.value?.$el
    if (listElement) {
      const items = listElement.querySelectorAll('.transaction-item')
      const itemElement = items[index]
      if (itemElement) {
        itemElement.scrollIntoView({ behavior: 'smooth', block: 'center' })
      }
    }
  }
}

// 初始化
onMounted(() => {
  fetchStatistics()
  window.addEventListener('resize', handleResize)
})

const handleResize = () => {
  chartInstance && chartInstance.resize()
  pieChartInstance && pieChartInstance.resize()
}

// 监听DOM引用变化，确保在月份切换DOM重建后重新渲染图表
watch(chartRef, (newVal) => {
  // 无论有没有数据，只要DOM变了，就尝试渲染
  // 如果没有数据，renderChart 内部也应该处理（或者我们可以传空数据）
  if (newVal) {
    setTimeout(() => {
      // 传入当前 dailyData，即使是空的，renderChart 应该能处理
      renderChart(dailyData.value || [])
      chartInstance && chartInstance.resize()
    }, 50)
  }
})

watch(pieChartRef, (newVal) => {
  if (newVal) {
    setTimeout(() => {
      renderPieChart()
      pieChartInstance && pieChartInstance.resize()
    }, 50)
  }
})

// 页面激活时刷新数据（从其他页面返回时）
onActivated(() => {
  fetchStatistics()
})

// 全局监听交易删除事件，确保统计数据一致
const onGlobalTransactionDeleted = () => {
  // e.detail contains transaction id
  fetchStatistics()
}

window.addEventListener &&
  window.addEventListener('transaction-deleted', onGlobalTransactionDeleted)

onBeforeUnmount(() => {
  window.removeEventListener &&
    window.removeEventListener('transaction-deleted', onGlobalTransactionDeleted)
  window.removeEventListener('resize', handleResize)
  chartInstance && chartInstance.dispose()
  pieChartInstance && pieChartInstance.dispose()
})

const onGlobalTransactionsChanged = () => {
  fetchStatistics()
}

window.addEventListener &&
  window.addEventListener('transactions-changed', onGlobalTransactionsChanged)

onBeforeUnmount(() => {
  window.removeEventListener &&
    window.removeEventListener('transactions-changed', onGlobalTransactionsChanged)
})
</script>

<style scoped>
.page-container-flex {
  background: transparent !important;
}

.overview-fixed-wrapper {
  background: transparent !important;
  padding: 16px 0 1px 0;
  overflow-x: hidden;
}

.statistics-content {
  padding: 0;
  overflow-x: hidden; /* 防止滑动动画出现横向滚动条 */
}

:deep(.van-pull-refresh) {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

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

.nav-arrow {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 18px;
  color: var(--van-gray-5);
  cursor: pointer;
  transition: all 0.2s;
  z-index: 1;
}

.nav-arrow:active {
  color: var(--van-primary-color);
  background-color: rgba(0, 0, 0, 0.02);
}

.nav-arrow.left {
  left: 0;
  border-radius: 16px 0 0 16px;
}

.nav-arrow.right {
  right: 0;
  border-radius: 0 16px 16px 0;
}

.nav-arrow.disabled {
  color: #c8c9cc;
  cursor: not-allowed;
  opacity: 0.35;
  pointer-events: none;
}

.nav-arrow.disabled:active {
  background-color: transparent;
}

.date-tag {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  color: var(--van-primary-color);
  background-color: var(--van-primary-color-light);
  padding: 2px 10px;
  border-radius: 0 0 10px 10px;
  font-weight: 500;
  opacity: 0.9;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 2px;
  z-index: 2;
}

@media (prefers-color-scheme: dark) {
  .date-tag {
    background-color: rgba(var(--van-primary-color-rgb), 0.2);
  }
}

/* 动画效果 */
.slide-left-enter-active,
.slide-left-leave-active,
.slide-right-enter-active,
.slide-right-leave-active {
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-left-enter-from {
  opacity: 0;
  transform: translateX(30px);
}
.slide-left-leave-to {
  opacity: 0;
  transform: translateX(-30px);
}

.slide-right-enter-from {
  opacity: 0;
  transform: translateX(-30px);
}
.slide-right-leave-to {
  opacity: 0;
  transform: translateX(30px);
}

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

.overview-item.clickable {
  cursor: pointer;
  transition: background-color 0.2s;
  padding: 0;
  border-radius: 8px;
}

.overview-item.clickable:active {
  background-color: #f0f0f0;
}

@media (prefers-color-scheme: dark) {
  .overview-item.clickable:active {
    background-color: #2c2c2c;
  }
}

.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: var(--van-danger-color);
}

.income {
  color: var(--van-success-color);
}

/* 环形图 */
.chart-container {
  padding: 12px 0;
}

.ring-chart {
  position: relative;
  width: 100%;
  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;
  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;
  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;
}

.income-color {
  background-color: var(--van-success-color);
}

.income-text {
  color: var(--van-success-color);
}

/* 不计收支颜色 */
.none-color {
  background-color: var(--van-gray-6);
}

.none-text {
  color: var(--van-gray-6);
}

.expense-color {
  background-color: var(--van-danger-color);
}

/* 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: space-center;
  gap: 24px;
  padding-top: 12px;
  border-top: 1px solid var(--van-border-color);
}

.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: var(--van-background-2);
  padding: 16px;
  border-radius: 12px;
  text-align: center;
}

/* @media (prefers-color-scheme: dark) {
  .stat-item {
    background: var(--van-background-2);
  }
} */

.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);
}

/* 设置页面容器背景色 */
:deep(.van-nav-bar) {
  background: transparent !important;
}
</style>