<template>
  <view class="explain-hall-select">
    <view class="explain-page-header">
      <view class="header-back" @tap="handleBack">
        <text class="header-back-icon">‹</text>
        <text class="header-back-text">返回</text>
      </view>
      <text class="header-title">讲解</text>
    </view>

    <scroll-view
      class="explain-scroll"
      scroll-y
      :show-scrollbar="false"
    >
      <view v-if="loading" class="state-block">
        <text class="state-title">正在加载展厅讲解</text>
        <text class="state-desc">稍后将展示可选择的展厅。</text>
      </view>

      <view v-else-if="error" class="state-block error">
        <text class="state-title">讲解内容加载失败</text>
        <text class="state-desc">{{ error }}</text>
      </view>

      <template v-else>
        <view class="section-heading">
          <text class="section-title">请选择展厅</text>
          <text class="section-count">{{ filteredHalls.length }} 个展厅</text>
        </view>

        <view v-if="filteredHalls.length" class="hall-list">
          <view
            v-for="hall in filteredHalls"
            :key="hall.id"
            class="hall-card"
            @tap="handleHallClick(hall.id)"
          >
            <image
              v-if="hall.image"
              class="hall-thumb"
              :src="hall.image"
              mode="aspectFill"
            />
            <view v-else class="hall-thumb placeholder">
              <text class="hall-thumb-text">{{ hallIconText(hall.name) }}</text>
            </view>

            <view class="hall-main">
              <text class="hall-name">{{ hall.name }}</text>
              <view class="hall-meta-row">
                <view class="floor-badge">
                  <text class="floor-badge-text">{{ hall.floorLabel || '楼层待补充' }}</text>
                </view>
                <text class="hall-meta-text">{{ hall.explainCount > 0 ? `${hall.explainCount} 条讲解` : '暂无讲解' }}</text>
              </view>
            </view>

            <text class="hall-arrow">›</text>
          </view>
        </view>

        <view v-else class="state-block empty">
          <text class="state-title">未找到相关展厅</text>
          <text class="state-desc">暂无可选择的展厅讲解。</text>
        </view>
      </template>
    </scroll-view>
  </view>
</template>

<script setup lang="ts">
import { computed } from 'vue'

export interface ExplainHallSelectItem {
  id: string
  name: string
  floorLabel?: string
  image?: string
  explainCount: number
  searchText: string
}

const props = withDefaults(defineProps<{
  halls?: ExplainHallSelectItem[]
  loading?: boolean
  error?: string
}>(), {
  halls: () => [],
  loading: false,
  error: ''
})

const emit = defineEmits<{
  hallClick: [hallId: string]
  back: []
}>()

const filteredHalls = computed(() => props.halls)

const hallIconText = (name: string) => name.trim().slice(0, 1) || '讲'

const handleHallClick = (hallId: string) => {
  emit('hallClick', hallId)
}

const handleBack = () => {
  emit('back')
}
</script>

<style scoped lang="scss">
.explain-hall-select {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #f9fafb;
}

.explain-scroll {
  height: 100%;
  padding: 76px 20px calc(28px + env(safe-area-inset-bottom));
  box-sizing: border-box;
}

.section-title,
.section-count,
.state-title,
.state-desc,
.hall-name,
.hall-meta-text {
  display: block;
}

.explain-page-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  box-sizing: border-box;
  background: #ffffff;
  border-bottom: 1px solid #eceee8;
  z-index: 2001;
}

.header-back {
  position: absolute;
  left: 12px;
  top: 0;
  height: 56px;
  min-width: 74px;
  display: flex;
  align-items: center;
  gap: 2px;
}

.header-back-icon {
  font-size: 27px;
  line-height: 27px;
  color: #151713;
}

.header-back-text {
  font-size: 15px;
  line-height: 21px;
  font-weight: 500;
  color: #151713;
}

.header-title {
  font-size: 18px;
  line-height: 25px;
  font-weight: 800;
  color: #151713;
}

.section-heading {
  margin-top: 0;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.section-title {
  font-size: 19px;
  line-height: 27px;
  font-weight: 800;
  color: #151713;
}

.section-count {
  flex-shrink: 0;
  font-size: 12px;
  line-height: 18px;
  color: #7b8275;
}

.hall-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.hall-card {
  min-height: 112px;
  padding: 14px 13px 14px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-sizing: border-box;
  background: #ffffff;
  border: 1px solid #e4e6df;
  border-radius: 8px;
  box-shadow: 0 8px 18px rgba(36, 49, 42, 0.05);
}

.hall-card:active {
  background: #f7f8f3;
}

.hall-thumb {
  flex-shrink: 0;
  width: 68px;
  height: 68px;
  border-radius: 8px;
  background: #f1f2ee;
}

.hall-thumb.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hall-thumb-text {
  font-size: 24px;
  line-height: 32px;
  font-weight: 800;
  color: #83927a;
}

.hall-main {
  flex: 1;
  min-width: 0;
}

.hall-name {
  font-size: 17px;
  line-height: 24px;
  font-weight: 800;
  color: #151713;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hall-meta-row {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.floor-badge {
  flex-shrink: 0;
  min-width: 28px;
  height: 24px;
  padding: 0 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  background: #ffffff;
  border: 1px solid #e0df00;
  border-radius: 6px;
}

.floor-badge-text {
  font-size: 13px;
  line-height: 17px;
  font-weight: 600;
  color: #aaa900;
}

.hall-meta-text {
  min-width: 0;
  font-size: 15px;
  line-height: 21px;
  color: #555c51;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hall-arrow {
  flex-shrink: 0;
  font-size: 30px;
  line-height: 30px;
  color: #151713;
}

.state-block {
  margin: 34px 0;
  padding: 22px 16px;
  box-sizing: border-box;
  text-align: center;
  background: #ffffff;
  border: 1px solid #e4e6df;
  border-radius: 8px;
}

.state-title {
  font-size: 15px;
  line-height: 21px;
  font-weight: 700;
  color: #151713;
}

.state-desc {
  margin-top: 6px;
  font-size: 12px;
  line-height: 18px;
  color: #68725d;
}

.state-block.error {
  border-color: #e5c2c2;
  background: #fff7f7;
}
</style>
