<template>
  <!-- 页面加载状态 -->
  <view v-if="type === 'page' && loading" class="loading-page">
    <view class="loading-spinner">
      <view class="spinner"></view>
    </view>
    <text class="loading-text">{{ text || '加载中...' }}</text>
  </view>
  
  <!-- 下拉刷新状态 -->
  <view v-else-if="type === 'refresh'" class="loading-refresh">
    <view class="refresh-spinner" :class="{ 'is-loading': loading }">
      <view class="spinner-icon"></view>
    </view>
    <text class="refresh-text">{{ loading ? (text || '刷新中...') : '下拉刷新' }}</text>
  </view>
  
  <!-- 加载更多状态 -->
  <view v-else-if="type === 'more'" class="loading-more">
    <template v-if="loading">
      <view class="more-spinner"></view>
      <text class="more-text">{{ text || '加载中...' }}</text>
    </template>
    <template v-else-if="noMore">
      <text class="more-text no-more">{{ noMoreText || '没有更多了' }}</text>
    </template>
    <template v-else>
      <text class="more-text">上拉加载更多</text>
    </template>
  </view>
  
  <!-- 内联加载状态 -->
  <view v-else-if="type === 'inline' && loading" class="loading-inline">
    <view class="inline-spinner"></view>
    <text v-if="text" class="inline-text">{{ text }}</text>
  </view>
</template>

<script>
export default {
  name: 'Loading',
  props: {
    type: {
      type: String,
      default: 'page',
      validator: (value) => ['page', 'refresh', 'more', 'inline'].includes(value)
    },
    loading: {
      type: Boolean,
      default: false
    },
    text: {
      type: String,
      default: ''
    },
    noMore: {
      type: Boolean,
      default: false
    },
    noMoreText: {
      type: String,
      default: '没有更多了'
    }
  }
}
</script>

<style lang="scss" scoped>
// 通用spinner动画
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

// 页面加载
.loading-page {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.9);
  z-index: 998;
  
  .loading-spinner {
    margin-bottom: 20rpx;
    
    .spinner {
      width: 60rpx;
      height: 60rpx;
      border: 4rpx solid #f0f0f0;
      border-top-color: #ff6b6b;
      border-radius: 50%;
      animation: spin 0.8s linear infinite;
    }
  }
  
  .loading-text {
    font-size: 28rpx;
    color: #666;
  }
}

// 下拉刷新
.loading-refresh {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20rpx 0;
  
  .refresh-spinner {
    margin-bottom: 10rpx;
    
    .spinner-icon {
      width: 40rpx;
      height: 40rpx;
      border: 3rpx solid #f0f0f0;
      border-top-color: #ff6b6b;
      border-radius: 50%;
    }
    
    &.is-loading .spinner-icon {
      animation: spin 0.8s linear infinite;
    }
  }
  
  .refresh-text {
    font-size: 24rpx;
    color: #999;
  }
}

// 加载更多
.loading-more {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30rpx 0;
  
  .more-spinner {
    width: 32rpx;
    height: 32rpx;
    border: 3rpx solid #f0f0f0;
    border-top-color: #ff6b6b;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 12rpx;
  }
  
  .more-text {
    font-size: 26rpx;
    color: #999;
    
    &.no-more {
      color: #ccc;
    }
  }
}

// 内联加载
.loading-inline {
  display: inline-flex;
  align-items: center;
  
  .inline-spinner {
    width: 28rpx;
    height: 28rpx;
    border: 2rpx solid #f0f0f0;
    border-top-color: #ff6b6b;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
  }
  
  .inline-text {
    font-size: 24rpx;
    color: #999;
    margin-left: 8rpx;
  }
}
</style>
