<template>
  <div class="bar-chart">
    <div class="rank-labels">
      <div v-for="(item, idx) in items" :key="item.name" class="rank-label">
        <span class="rank-badge" :class="medalClass(idx)">
          <svg v-if="idx < 3" width="18" height="18" viewBox="0 0 18 18">
            <circle cx="9" cy="9" r="8" :fill="medalFill(idx)" />
            <text x="9" y="13" text-anchor="middle" fill="#fff" font-size="10" font-weight="700">{{ idx + 1 }}</text>
          </svg>
          <template v-else>{{ idx + 1 }}</template>
        </span>
        <span class="rank-name">{{ item.name || item.shortName }}</span>
      </div>
    </div>
    <div class="chart-area">
      <Bar :data="chartData" :options="chartOptions" />
    </div>
  </div>
</template>

<script setup>
import { computed } from 'vue'
import { Bar } from 'vue-chartjs'
import {
  Chart as ChartJS,
  CategoryScale,
  LinearScale,
  BarElement,
  Tooltip
} from 'chart.js'

ChartJS.register(CategoryScale, LinearScale, BarElement, Tooltip)

const props = defineProps({
  items: { type: Array, required: true }
})

const medalClass = (idx) => {
  if (idx === 0) return 'gold'
  if (idx === 1) return 'silver'
  if (idx === 2) return 'bronze'
  return ''
}

const medalFill = (idx) => {
  if (idx === 0) return '#f59e0b'
  if (idx === 1) return '#94a3b8'
  if (idx === 2) return '#cd7f32'
  return '#94a3b8'
}

const formatValue = (value) => {
  if (value >= 1_000_000) return `¥${(value / 1_000_000).toFixed(1)}M`
  if (value >= 1_000) return `¥${(value / 1_000).toFixed(1)}K`
  return `¥${value}`
}

const chartData = computed(() => ({
  labels: props.items.map((i) => i.name || i.shortName),
  datasets: [{
    data: props.items.map((i) => i.value || i.amount),
    backgroundColor: props.items.map((i) => i.color),
    borderRadius: 6,
    borderSkipped: false,
    barPercentage: 0.7,
    categoryPercentage: 0.85
  }]
}))

const chartOptions = {
  indexAxis: 'y',
  responsive: true,
  maintainAspectRatio: false,
  layout: {
    padding: { left: 0, right: 12 }
  },
  plugins: {
    legend: { display: false },
    tooltip: {
      backgroundColor: 'rgba(255,255,255,0.96)',
      titleColor: '#1e293b',
      bodyColor: '#64748b',
      borderColor: '#e2e8f0',
      borderWidth: 1,
      padding: 10,
      boxPadding: 4,
      cornerRadius: 6,
      callbacks: {
        title: () => '',
        label: (ctx) => ` ${formatValue(ctx.parsed.x)}`
      }
    }
  },
  scales: {
    x: {
      beginAtZero: true,
      grid: {
        color: '#f1f5f9',
        drawTicks: false
      },
      ticks: {
        color: '#94a3b8',
        font: { size: 11 },
        padding: 4,
        callback: (value) => formatValue(value)
      },
      border: { display: false }
    },
    y: {
      grid: { display: false },
      border: { display: false },
      ticks: { display: false }
    }
  }
}
</script>

<style scoped>
.bar-chart {
  display: flex;
  width: 100%;
  gap: 8px;
}

.rank-labels {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  padding: 6px 0;
}

.rank-label {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  white-space: nowrap;
}

.rank-badge {
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  color: #fff;
}

.rank-badge:not(.gold):not(.silver):not(.bronze) {
  background: #cbd5e1;
}

.rank-badge svg {
  display: block;
}

.rank-name {
  color: #475569;
  font-size: 13px;
  font-weight: 500;
}

.chart-area {
  flex: 1;
  min-width: 0;
  position: relative;
  height: 240px;
}
</style>