<template>
  <div class="page-container-flex">
    <!-- 顶部导航栏 -->
    <van-nav-bar
      placeholder
    >
      <template #title>
        <div
          class="nav-date-picker"
          @click="showMonthPicker = true"
        >
          <span>{{ currentMonth === 0 ? `${currentYear}年` : `${currentYear}年${currentMonth}月` }}</span>
          <van-icon name="arrow-down" />
        </div>
      </template>
      <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>

      <!-- 统计内容（可滚动部分） -->
      <div
        v-if="!firstLoading"
        class="statistics-content"
      >
        <div>
          <!-- 余额卡片 -->
          <div
            class="common-card"
            style="margin-top: 12px;"
          >
            <div
              class="card-header"
              style="padding-bottom: 0;"
            >
              <h3 class="card-title">
                余额
              </h3>
            </div>

            <!-- 余额金额 -->
            <div class="balance-amount">
              <span
                class="balance-value"
                :class="{ 'balance-positive': displayBalance >= 0, 'balance-negative': displayBalance < 0 }"
              >
                ¥{{ formatMoney(displayBalance) }}
              </span>
            </div>

            <!-- 余额变化图表 -->
            <div
              class="balance-chart"
              style="height: 130px; padding: 0"
            >
              <div
                ref="balanceChartRef"
                style="width: 100%; height: 100%"
              />
            </div>
          </div>

          <!-- 趋势统计 -->
          <div
            class="common-card"
            style="padding-bottom: 5px; margin-top: 12px;"
          >
            <div
              class="card-header"
              style="padding-bottom: 0;"
            >
              <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>
          <!-- 收支和不计收支并列显示 -->
          <div
            v-if="incomeCategoriesView.length > 0 || noneCategoriesView.length > 0"
            class="side-by-side-cards"
          >
            <!-- 收入分类统计 -->
            <div
              v-if="incomeCategoriesView.length > 0"
              class="common-card half-card"
            >
              <div class="card-header">
                <h3 class="card-title">
                  收入
                  <span
                    class="income-text"
                    style="font-size: 13px; margin-left: 4px"
                  >
                    ¥{{ formatMoney(monthlyData.totalIncome) }}
                  </span>
                </h3>
                <van-tag
                  type="success"
                  size="medium"
                >
                  {{ incomeCategoriesView.length }}
                </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" />
                    <span class="category-name text-ellipsis">{{ category.classify || '未分类' }}</span>
                  </div>
                  <div class="category-amount income-text">
                    ¥{{ formatMoney(category.amount) }}
                  </div>
                </div>
              </div>
            </div>

            <!-- 不计收支分类统计 -->
            <div
              v-if="noneCategoriesView.length > 0"
              class="common-card half-card"
            >
              <div class="card-header">
                <h3 class="card-title">
                  不计收支
                </h3>
                <van-tag
                  type="warning"
                  size="medium"
                >
                  {{ noneCategoriesView.length }}
                </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" />
                    <span class="category-name text-ellipsis">{{ category.classify || '未分类' }}</span>
                  </div>
                  <div class="category-amount none-text">
                    ¥{{ formatMoney(category.amount) }}
                  </div>
                </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>

    <!-- 日期选择器 -->
    <van-popup
      v-model:show="showMonthPicker"
      position="bottom"
      round
      teleport="body"
    >
      <div class="date-picker-header">
        <van-tabs
          v-model:active="dateSelectionMode"
          line-width="20px"
          :ellipsis="false"
        >
          <van-tab title="按月" name="month" />
          <van-tab title="按年" name="year" />
        </van-tabs>
      </div>
      <van-date-picker
        v-model="selectedDate"
        :title="dateSelectionMode === 'year' ? '选择年份' : '选择月份'"
        :min-date="minDate"
        :max-date="maxDate"
        :columns-type="dateSelectionMode === 'year' ? ['year'] : ['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, getBalanceStatistics } 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'
import { getCssVar } from '@/utils/theme'

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 dateSelectionMode = ref('month')
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 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
})

// 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([])
// 余额数据（独立）
const balanceData = ref([])
const chartRef = ref(null)
const pieChartRef = ref(null)
const balanceChartRef = ref(null)
let chartInstance = null
let pieChartInstance = null
let balanceChartInstance = null

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

// 颜色配置
const getChartColors = () => [
  getCssVar('--chart-color-1'),
  getCssVar('--chart-color-2'),
  getCssVar('--chart-color-3'),
  getCssVar('--chart-color-4'),
  getCssVar('--chart-color-5'),
  getCssVar('--chart-color-6'),
  getCssVar('--chart-color-7'),
  getCssVar('--chart-color-8'),
  getCssVar('--chart-color-9'),
  getCssVar('--chart-color-10'),
  getCssVar('--chart-color-11'),
  getCssVar('--chart-color-12'),
  getCssVar('--chart-color-13'),
  getCssVar('--chart-color-14'),
  getCssVar('--chart-color-15')
]

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

// 当月累积余额
const currentMonthBalance = computed(() => {
  if (balanceData.value.length === 0) {
    return 0
  }
  // 获取最后一天的累积余额
  return balanceData.value[balanceData.value.length - 1].cumulativeBalance || 0
})

// 显示的动画余额
const displayBalance = ref(0)

// 监听余额变化，执行动画
watch(currentMonthBalance, (newVal, oldVal) => {
  if (oldVal === undefined) {
    // 初始加载，直接设置，不需要动画
    displayBalance.value = newVal
    return
  }

  // 数字跳动动画
  const duration = 800 // 动画持续时间（毫秒）
  const startValue = oldVal
  const endValue = newVal
  const startTime = Date.now()

  const animate = () => {
    const elapsed = Date.now() - startTime
    const progress = Math.min(elapsed / duration, 1)

    // 使用缓动函数（easeOutQuad）
    const easeProgress = 1 - (1 - progress) * (1 - progress)
    displayBalance.value = Math.round(startValue + (endValue - startValue) * easeProgress)

    if (progress < 1) {
      requestAnimationFrame(animate)
    } else {
      displayBalance.value = endValue
    }
  }

  animate()
})

// 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, ',')
}

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

// 确认月份选择
const onMonthConfirm = ({ selectedValues }) => {
  const newYear = parseInt(selectedValues[0])
  const newMonth = dateSelectionMode.value === 'year' ? 0 : parseInt(selectedValues[1])

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

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

  fetchStatistics()
}

// 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(), fetchBalanceData()])
  } 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()
      renderBalanceChart()
    })
  }
}

// 获取月度数据
const fetchMonthlyData = async () => {
  try {
    const response = await getMonthlyStatistics({
      year: currentYear.value,
      month: currentMonth.value || 0
    })

    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 || 0,
      type: 0 // 支出
    })

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

    // 获取收入分类
    const incomeResponse = await getCategoryStatistics({
      year: currentYear.value,
      month: currentMonth.value || 0,
      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 || 0,
      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 || 0
    })

    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')
  }
}

// 获取余额统计数据（独立接口）
const fetchBalanceData = async () => {
  try {
    const response = await getBalanceStatistics({
      year: currentYear.value,
      month: currentMonth.value || 0
    })

    if (response.success && response.data) {
      balanceData.value = response.data
    }
  } catch (error) {
    console.error('获取余额统计数据失败:', error)
    showToast('获取余额统计数据失败')
  }
}

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 legendData = [
    { name: '支出', value: '¥' + formatMoney(expenses[expenses.length - 1]) },
    { name: '收入', value: '¥' + formatMoney(incomes[incomes.length - 1]) },
    { name: '存款', value: '¥' + formatMoney(balances[balances.length - 1]) }
  ]

  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: legendData.map((item) => item.name),
      bottom: 0,
      textStyle: {
        color: getCssVar('--chart-text-muted') // 适配深色模式
      },
      formatter: function (name) {
        const item = legendData.find((d) => d.name === name)
        return item ? `${name}  ${item.value}` : name
      }
    },
    grid: {
      left: '3%',
      right: '4%',
      bottom: '15%',
      top: '5%',
      containLabel: true
    },
    xAxis: {
      type: 'category',
      boundaryGap: false,
      data: dates,
      axisLabel: {
        color: getCssVar('--chart-text-muted') // 适配深色模式
      }
    },
    yAxis: {
      type: 'value',
      splitNumber: 5,
      axisLabel: {
        color: getCssVar('--chart-text-muted'), // 适配深色模式
        formatter: (value) => {
          return value / 1000 + 'k'
        }
      },
      splitLine: {
        lineStyle: {
          type: 'dashed',
          color: getCssVar('--van-border-color') // 深色分割线
        }
      }
    },
    series: [
      {
        name: '支出',
        type: 'line',
        data: expenses,
        itemStyle: { color: getCssVar('--chart-color-1') },
        showSymbol: false,
        smooth: true,
        lineStyle: { width: 2 }
      },
      {
        name: '收入',
        type: 'line',
        data: incomes,
        itemStyle: { color: getCssVar('--chart-color-2') },
        showSymbol: false,
        smooth: true,
        lineStyle: { width: 2 }
      },
      {
        name: '存款',
        type: 'line',
        data: balances,
        itemStyle: { color: getCssVar('--chart-color-13') },
        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)

  const MAX_SLICES = 8 // 最大显示扇区数，其余合并为"其他"
  const currentColors = getChartColors()

  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)

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

    chartData.push({
      value: otherAmount,
      name: '其他',
      itemStyle: { color: getCssVar('--van-gray-6') } // 使用灰色表示其他
    })
  } else {
    chartData = list.map((item, index) => ({
      value: item.amount,
      name: item.classify || '未分类',
      itemStyle: { color: currentColors[index % currentColors.length] }
    }))
  }

  const option = {
    title: {
      text: '¥' + formatMoney(monthlyData.value.totalExpense),
      subtext: '总支出',
      left: 'center',
      top: 'center',
      textStyle: {
        color: getCssVar('--chart-text-muted'), // 适配深色模式
        fontSize: 20,
        fontWeight: 'bold'
      },
      subtextStyle: {
        color: getCssVar('--chart-text-muted'),
        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: getCssVar('--van-background-2'),
          borderWidth: 2
        },
        label: {
          show: true,
          position: 'outside',
          formatter: '{b}',
          color: getCssVar('--van-text-color-2') // 适配深色模式
        },
        labelLayout: {
          hideOverlap: true // 隐藏重叠标签
        },
        labelLine: {
          show: true,
          lineStyle: {
            color: getCssVar('--van-text-color-3')
          },
          smooth: 0.2,
          length: 10,
          length2: 20
        },
        data: chartData
      }
    ]
  }

  pieChartInstance.setOption(option)
}

// 渲染余额变化图表
const renderBalanceChart = () => {
  if (!balanceChartRef.value) {
    return
  }
  if (balanceData.value.length === 0) {
    return
  }

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

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

  if (balanceChartInstance && balanceChartInstance.getDom() !== balanceChartRef.value) {
    balanceChartInstance.dispose()
    balanceChartInstance = null
  }

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

  if (!balanceChartInstance) {
    balanceChartInstance = echarts.init(balanceChartRef.value)
  }

  const dates = balanceData.value.map((item) => {
    const date = new Date(item.date)
    return `${date.getMonth() + 1}/${date.getDate()}`
  })

  const balances = balanceData.value.map((item) => item.cumulativeBalance)

  const option = {
    tooltip: {
      trigger: 'axis',
      formatter: function (params) {
        if (params.length === 0) {
          return ''
        }
        const param = params[0]
        return `${param.name}<br/>余额: ¥${formatMoney(param.value)}`
      }
    },
    grid: {
      left: '3%',
      right: '4%',
      bottom: '5%',
      top: '5%',
      containLabel: true
    },
    xAxis: {
      type: 'category',
      boundaryGap: false,
      data: dates,
      axisLabel: {
        color: getCssVar('--chart-text-muted'),
        fontSize: 11
      }
    },
    yAxis: {
      type: 'value',
      splitNumber: 4,
      axisLabel: {
        color: getCssVar('--chart-text-muted'),
        fontSize: 11,
        formatter: (value) => {
          return value / 1000 + 'k'
        }
      },
      splitLine: {
        lineStyle: {
          type: 'dashed',
          color: getCssVar('--van-border-color')
        }
      }
    },
    series: [
      {
        name: '余额',
        type: 'line',
        data: balances,
        itemStyle: { color: getCssVar('--chart-color-13') },
        showSymbol: false,
        smooth: true,
        lineStyle: { width: 2 },
        areaStyle: {
          color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
            {
              offset: 0,
              color: getCssVar('--chart-color-13')
            },
            {
              offset: 1,
              color: getCssVar('--chart-color-13')
            }
          ])
        }
      }
    ]
  }

  balanceChartInstance.setOption(option)
  // 设置图表透明度
  if (balanceChartRef.value) {
    balanceChartRef.value.style.opacity = '0.85'
  }
}

// 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()
}

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 || 0,
      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.info('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()
  balanceChartInstance && balanceChartInstance.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)
  }
})

watch(balanceChartRef, (newVal) => {
  if (newVal) {
    setTimeout(() => {
      renderBalanceChart()
      balanceChartInstance && balanceChartInstance.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()
  balanceChartInstance && balanceChartInstance.dispose()
})

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

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

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

// 监听日期选择模式变化，更新selectedDate数组
watch(dateSelectionMode, (newMode) => {
  if (newMode === 'year') {
    // 切换到年份模式：只保留年份
    selectedDate.value = [currentYear.value.toString()]
  } else {
    // 切换到月份模式：添加当前月份
    selectedDate.value = [
      currentYear.value.toString(),
      (currentMonth.value || new Date().getMonth() + 1).toString().padStart(2, '0')
    ]
  }
})
</script>

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

.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;
}

/* 导航栏日期选择器 */
.nav-date-picker {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  color: var(--van-text-color);
}

/* 余额卡片 */
.balance-amount {
  text-align: center;
  padding: 9px 0 8px 0;
  font-size: 32px;
  font-weight: bold;
  color: var(--van-text-color);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
  "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.balance-value {
  color: var(--chart-color-13);
  transition: color 0.3s ease;
}

.balance-value.balance-positive {
  color: var(--van-success-color);
}

.balance-value.balance-negative {
  color: var(--van-danger-color);
}

.balance-chart {
  border-radius: 8px;
  padding: 10px 0;
  margin: 0 -12px;
}

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

.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;
}

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

/* 并列显示卡片 */
.side-by-side-cards {
  display: flex;
  gap: 12px;
  margin: 0 12px 16px;
}

.side-by-side-cards .common-card {
  margin: 0;
  flex: 1;
  min-width: 0; /* 允许内部元素缩小 */
  padding: 12px;
}

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

.text-ellipsis {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
}

/* 日期选择器头部 */
.date-picker-header {
  padding: 12px 16px 0;
  background: var(--van-background-2);
  border-bottom: 1px solid var(--van-border-color);
}

.date-picker-header :deep(.van-tabs) {
  background: transparent;
}

.date-picker-header :deep(.van-tabs__nav) {
  background: transparent;
  padding-bottom: 0;
}

.date-picker-header :deep(.van-tab) {
  font-size: 15px;
  font-weight: 500;
}

</style>
