<template>
  <!--
    列表骨架屏：按 type 模拟医生卡/消息行/商品卡/资讯卡/分类侧栏，
    放在分包以控制主包体积，主包页通过 componentPlaceholder 异步引用。
  -->
  <view class="list-skeleton" :class="'list-skeleton--' + type">
    <view
      v-for="i in rowCount"
      :key="i"
      class="sk-row"
      :class="'sk-row--' + type"
    >
      <!-- 医生推荐卡片 -->
      <template v-if="type === 'doctor'">
        <view class="sk-avatar sk-shimmer"></view>
        <view class="sk-body">
          <view class="sk-line sk-line--lg sk-shimmer"></view>
          <view class="sk-line sk-line--md sk-shimmer"></view>
          <view class="sk-line sk-line--sm sk-shimmer"></view>
        </view>
      </template>
      <!-- 消息列表行 -->
      <template v-else-if="type === 'message'">
        <view class="sk-avatar sk-avatar--round sk-shimmer"></view>
        <view class="sk-body">
          <view class="sk-line-row">
            <view class="sk-line sk-line--md sk-shimmer"></view>
            <view class="sk-line sk-line--xs sk-shimmer"></view>
          </view>
          <view class="sk-line sk-line--sm sk-shimmer"></view>
        </view>
      </template>
      <!-- 商品卡片 -->
      <template v-else-if="type === 'product'">
        <view class="sk-prod-img sk-shimmer"></view>
        <view class="sk-body">
          <view class="sk-line sk-line--lg sk-shimmer"></view>
          <view class="sk-line sk-line--sm sk-shimmer"></view>
          <view class="sk-line sk-line--md sk-shimmer"></view>
        </view>
      </template>
      <!-- 资讯文章卡片 -->
      <template v-else-if="type === 'article'">
        <view class="sk-cover sk-shimmer"></view>
        <view class="sk-cover-title sk-shimmer"></view>
      </template>
      <!-- 资讯左侧分类 -->
      <template v-else-if="type === 'category'">
        <view class="sk-cate-item sk-shimmer"></view>
      </template>
      <!-- 金刚区横滑块 -->
      <template v-else-if="type === 'zone'">
        <view class="sk-zone-icon sk-shimmer"></view>
        <view class="sk-line sk-line--xs sk-shimmer"></view>
      </template>
    </view>
  </view>
</template>

<script>
export default {
  name: 'ListSkeleton',
  props: {
    // 骨架样式类型
    type: {
      type: String,
      default: 'message',
      validator(v) {
        return ['doctor', 'message', 'product', 'article', 'category', 'zone'].indexOf(v) !== -1
      }
    },
    // 行数
    rows: {
      type: [Number, String],
      default: 3
    }
  },
  computed: {
    rowCount() {
      const n = Number(this.rows)
      return n > 0 ? n : 3
    }
  }
}
</script>

<style lang="scss" scoped>
.list-skeleton {
  width: 100%;
}

.sk-shimmer {
  background: linear-gradient(90deg, #ebebeb 25%, #f5f5f5 50%, #ebebeb 75%);
  background-size: 400% 100%;
  animation: sk-shimmer 1.4s ease infinite;
}

@keyframes sk-shimmer {
  0% {
    background-position: 100% 0;
  }
  100% {
    background-position: 0 0;
  }
}

.sk-row--doctor {
  display: flex;
  align-items: flex-start;
  margin: 0 24rpx 20rpx;
  padding: 28rpx;
  background: #fff;
  border-radius: 24rpx;

  .sk-avatar {
    width: 96rpx;
    height: 96rpx;
    border-radius: 50%;
    flex-shrink: 0;
    margin-right: 20rpx;
  }

  .sk-body {
    flex: 1;
  }
}

.sk-row--message {
  display: flex;
  align-items: center;
  padding: 32rpx 38rpx;
  background: #fff;

  .sk-avatar {
    width: 84rpx;
    height: 84rpx;
    border-radius: 50%;
    flex-shrink: 0;
    margin-right: 24rpx;
  }

  .sk-body {
    flex: 1;
  }

  .sk-line-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12rpx;
  }
}

.sk-row--product {
  display: flex;
  margin: 0 24rpx 20rpx;
  padding: 20rpx;
  background: #fff;
  border-radius: 16rpx;

  .sk-prod-img {
    width: 160rpx;
    height: 160rpx;
    border-radius: 12rpx;
    flex-shrink: 0;
    margin-right: 20rpx;
  }

  .sk-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
}

.sk-row--article {
  position: relative;
  width: 500rpx;
  height: 246rpx;
  margin: 10rpx auto;
  border-radius: 12rpx;
  overflow: hidden;

  .sk-cover {
    width: 100%;
    height: 100%;
    border-radius: 12rpx;
  }

  .sk-cover-title {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 92rpx;
    opacity: 0.5;
  }
}

.sk-row--category {
  width: 184rpx;
  height: 100rpx;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;

  .sk-cate-item {
    width: 100rpx;
    height: 28rpx;
    border-radius: 6rpx;
  }
}

.list-skeleton--zone {
  display: flex;
  flex-wrap: nowrap;
  padding: 16rpx 24rpx;
  overflow: hidden;
}

.sk-row--zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 140rpx;
  flex-shrink: 0;
  margin-right: 16rpx;

  .sk-zone-icon {
    width: 88rpx;
    height: 88rpx;
    border-radius: 20rpx;
    margin-bottom: 12rpx;
  }

  .sk-line--xs {
    width: 72rpx;
  }
}

.sk-line {
  height: 24rpx;
  border-radius: 6rpx;
  margin-bottom: 16rpx;

  &:last-child {
    margin-bottom: 0;
  }
}

.sk-line--lg {
  width: 70%;
}

.sk-line--md {
  width: 50%;
}

.sk-line--sm {
  width: 90%;
}

.sk-line--xs {
  width: 80rpx;
  height: 20rpx;
  margin-bottom: 0;
}

.sk-line-row .sk-line--md {
  width: 40%;
  margin-bottom: 0;
}
</style>
