<template>
  <view>
    <view class="section-header">
      <text class="section-title">{{ title }}</text>
      <text class="section-more" @tap="$emit('view-all')">查看全部</text>
    </view>
    
    <!-- 分组展示 -->
    <view v-if="grouped && rewardGroups.length > 0">
      <view class="prize-level-row" v-for="group in rewardGroups" :key="group.level">
        <view class="level-header-row">
          <view class="level-badge" :class="{ 'badge-boss': group.level === 'BOSS' }">{{ group.level }}赏</view>
          <text class="level-prob">总概率 {{ group.totalPercent }}%</text>
        </view>
        <scroll-view class="preview-scroll" scroll-x>
          <view class="preview-item" v-for="(item, idx) in group.rewards" :key="item.id || idx">
            <view class="prize-tag tag-boss" v-if="item.boss">BOSS</view>
            <image class="preview-img" :src="item.image" mode="aspectFill" />
            <view class="preview-name">{{ item.title }}</view>
          </view>
        </scroll-view>
      </view>
    </view>

    <!-- 简单列表展示 -->
    <view v-else-if="rewards.length > 0">
      <scroll-view class="preview-scroll" scroll-x>
        <view class="preview-item" v-for="(item, idx) in rewards" :key="idx">
          <view class="prize-tag" :class="{ 'tag-boss': item.boss }">{{ item.boss ? 'BOSS' : (item.level || '赏') }}</view>
          <image class="preview-img" :src="item.image" mode="aspectFill" />
          <view class="preview-name">{{ item.title }}</view>
        </view>
      </scroll-view>
    </view>

    <!-- 空状态 -->
    <view v-else class="empty-state">
      <text class="empty-icon">📭</text>
      <text class="empty-text">{{ emptyText }}</text>
    </view>
  </view>
</template>

<script setup>
import { computed } from 'vue'
import { groupRewardsByLevel } from '@/utils/activity'

const props = defineProps({
  title: {
    type: String,
    default: '奖池配置'
  },
  rewards: {
    type: Array,
    default: () => []
  },
  grouped: {
    type: Boolean,
    default: false
  },
  emptyText: {
    type: String,
    default: '暂无奖品配置'
  }
})

defineEmits(['view-all'])

const rewardGroups = computed(() => {
  if (!props.grouped) return []
  return groupRewardsByLevel(props.rewards)
})
</script>

<style lang="scss" scoped>
/* ============================================
   奖池预览 - 与原始设计完全一致
   ============================================ */

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: $spacing-md;
}

.section-title {
  font-size: $font-md;
  font-weight: 700;
  color: $text-main;
}

.section-more {
  font-size: $font-sm;
  color: $text-tertiary;
  display: flex;
  align-items: center;

  &::after {
    content: '>';
    font-family: monospace;
    margin-left: 6rpx;
    font-weight: 700;
  }
}

/* 等级分组 */
.prize-level-row {
  margin-bottom: $spacing-lg;
  background: rgba(0,0,0,0.02);
  padding: $spacing-md;
  border-radius: $radius-lg;
  
  &:last-child { 
    margin-bottom: 0; 
  }
}

.level-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: $spacing-md;
}

.level-badge {
  display: inline-block;
  font-size: $font-xs;
  font-weight: 900;
  color: $text-main;
  background: #F0F0F0;
  padding: 4rpx 16rpx;
  border-radius: 8rpx;
  font-style: italic;
  border: 1rpx solid rgba(0,0,0,0.05);
  box-shadow: $shadow-xs;
  
  &.badge-boss {
    background: $gradient-gold;
    color: #78350F;
    border-color: rgba(217, 119, 6, 0.3);
  }
}

.level-prob {
  font-size: 22rpx;
  color: $brand-primary;
  font-weight: 800;
  opacity: 0.9;
}

/* 预览滚动区域 */
.preview-scroll {
  white-space: nowrap;
  width: 100%;
}

.preview-item {
  display: inline-block;
  width: 180rpx;
  margin-right: $spacing-md;
  vertical-align: top;
  position: relative;
  transition: transform 0.2s;

  &:active {
    transform: scale(0.96);
  }

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

.preview-img {
  width: 180rpx;
  height: 180rpx;
  border-radius: $radius-lg;
  background: $bg-secondary;
  margin-bottom: $spacing-sm;
  box-shadow: $shadow-sm;
  border: 1rpx solid rgba(0,0,0,0.03);
}

.preview-name {
  font-size: $font-xs;
  color: $text-secondary;
  width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
  font-weight: 500;
}

/* 奖品标签 */
.prize-tag {
  position: absolute;
  top: 10rpx;
  left: 10rpx;
  background: rgba(0,0,0,0.6);
  color: #fff;
  font-size: $font-xs;
  padding: 4rpx $spacing-sm;
  border-radius: $radius-sm;
  z-index: 10;
  font-weight: 700;
  backdrop-filter: blur(4rpx);
  transform: scale(0.9);
  transform-origin: top left;
  
  &.tag-boss {
    background: $gradient-brand;
    box-shadow: 0 4rpx 12rpx rgba($brand-primary, 0.4);
  }
}

/* 空状态 */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: $spacing-xl;
  color: $text-sub;
  min-height: 300rpx;  /* 防止切换时布局跳动 */
}

.empty-icon {
  font-size: 64rpx;
  margin-bottom: $spacing-sm;
}

.empty-text {
  font-size: $font-sm;
}
</style>
