<template>
  <div class="mb-6">
    <LTitle title="银行机构申请分布" />
    <div class="mt-4">
      <!-- 饼图：宽度占满 -->
      <div class="h-64 mb-4">
        <v-chart class="chart-container" :option="pieChartOption" autoresize />
      </div>

      <!-- 详细列表：在图表下方，展示所有项并带颜色标识 -->
      <div class="space-y-2">
        <div v-for="(item, index) in detailList" :key="index" class="flex justify-between items-center text-sm">
          <div class="flex items-center">
            <span class="w-2 h-2 rounded-full mr-2" :style="{ backgroundColor: item.color }" />
            <span class="text-gray-600">{{ item.label }}</span>
          </div>
          <span class="text-[#333333] font-bold">{{ item.value }}次</span>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup>
import { computed } from 'vue'
import VChart from 'vue-echarts'
import { use } from 'echarts/core'
import { CanvasRenderer } from 'echarts/renderers'
import { PieChart } from 'echarts/charts'
import {
  TitleComponent,
  TooltipComponent,
  LegendComponent
} from 'echarts/components'
import LTitle from '@/components/LTitle.vue'
import { getBankApplicationDetails, FIELD_LABELS } from '../utils/dataParser'

// 注册ECharts组件
use([
  CanvasRenderer,
  PieChart,
  TitleComponent,
  TooltipComponent,
  LegendComponent
])

const props = defineProps({
  data: {
    type: Object,
    required: true,
    default: () => ({})
  },
  period: {
    type: String,
    required: true
  }
})

// 颜色映射表（与图表保持一致）
const COLORS = [
  '#2B79EE',
  '#61D2F4',
  '#34D399',
  '#FBBF24',
  '#F97316',
  '#EF4444',
  '#A855F7',
  '#6B7280',
]

// 获取银行机构申请详情
const bankDetails = computed(() => getBankApplicationDetails(props.data, props.period))

// 计算银行机构总次数
const bankTotal = computed(() => {
  const details = bankDetails.value
  return Object.values(details).reduce((sum, val) => sum + (val || 0), 0)
})

// 详细列表（包含所有项，包含 0 次）
const detailList = computed(() => {
  const details = bankDetails.value
  const labels = FIELD_LABELS.bank

  return Object.entries(details)
    .map(([key, value], index) => ({
      key,
      label: labels[key] || key,
      value: value || 0,
      color: COLORS[index % COLORS.length],
    }))
})

// 饼图配置
const pieChartOption = computed(() => {
  const list = detailList.value

  if (!list || list.length === 0) {
    return {
      title: {
        text: '暂无数据',
        left: 'center',
        top: 'center',
        textStyle: {
          color: '#999',
          fontSize: 14
        }
      }
    }
  }

  return {
    tooltip: {
      trigger: 'item',
      formatter: '{b}: {c}次 ({d}%)'
    },
    graphic: {
      type: 'text',
      left: 'center',
      top: 'center',
      style: {
        text: '银行机构',
        fill: '#111827',
        fontSize: 14,
        fontWeight: 'bold',
      },
    },
    series: [
      {
        name: '申请次数',
        type: 'pie',
        radius: ['40%', '70%'],
        center: ['50%', '50%'],
        avoidLabelOverlap: false,
        itemStyle: {
          borderRadius: 4,
          borderColor: '#fff',
          borderWidth: 2
        },
        label: {
          show: false
        },
        emphasis: {
          itemStyle: {
            shadowBlur: 10,
            shadowOffsetX: 0,
            shadowColor: 'rgba(0, 0, 0, 0.5)'
          },
          label: {
            show: true,
            fontSize: 14,
            fontWeight: 'bold',
            color: '#333'
          }
        },
        data: list.map(item => ({
          value: item.value,
          name: item.label,
          itemStyle: {
            color: item.color
          }
        }))
      }
    ]
  }
})
</script>

<style lang="scss" scoped>
.chart-container {
  width: 100%;
  height: 100%;
}
</style>
