<template>
  <view class="notice-page">
    <!-- 自定义顶部导航组件 -->
    <custom-navbar 
      title="公告通知" 
      :showBack="true" 
      backgroundColor="#FFFFFF" 
      :show-headle="true"
      headleSrc="https://mrrplus.oss-cn-beijing.aliyuncs.com/photo/system/51ebca5d-95c5-4fb8-8aa3-560a79100d25.png" 
      @onHeadleClick="goToSearch"
    />

    <view class="page-content">
      <!-- 加载状态 -->
      <view v-if="loading" class="loading-container">
        <view class="loading-icon"></view>
        <text class="loading-text">加载中...</text>
      </view>

      <!-- 公告列表 -->
      <view v-else-if="noticeList.length > 0" class="notice-list">
        <NoticeCard 
          v-for="item in noticeList" 
          :key="item.id"
          :item="item" 
          @click="goToDetail"
        />
        
        <!-- 加载更多状态 -->
        <view v-if="loadingMore" class="load-more">
          <text>加载更多...</text>
        </view>
        <view v-else-if="!hasMore && noticeList.length > 0" class="no-more">
          <text>没有更多了</text>
        </view>
      </view>
      <!-- 空状态 -->
      <view v-else class="empty-container">
        <image class="empty-img" src="https://mrrplus.oss-cn-beijing.aliyuncs.com/photo/system/8c5e7b2a-3d4f-4b1e-9a7c-6e8f2d1b4a5c.png" mode="aspectFit"></image>
        <text class="empty-text">暂无公告通知</text>
      </view>
    </view>
  </view>
</template>

<script>
import CustomNavbar from '@/components/custom-navbar/custom-navbar.vue';
import NoticeCard from '@/pages/home/components/notice-card.vue';
import request from '@/utils/request';

export default {
  components: {
    CustomNavbar,
    NoticeCard   // 注册组件
  },
  data() {
    return {
      loading: false,
      loadingMore: false,
      noticeList: [],
      page: 1,
      limit: 10,
      total: 0,
      hasMore: true
    };
  },
  onLoad() {
    this.fetchNoticeList(true);
  },
  onPullDownRefresh() {
    this.fetchNoticeList(true);
  },
  onReachBottom() {
    if (!this.loadingMore && this.hasMore && !this.loading) {
      this.fetchNoticeList(false);
    }
  },
  methods: {
    // 跳转搜索页
    goToSearch() {
      uni.navigateTo({
        url: '/pages/search_common/search?type=notice'
      });
    },
    
    // 获取公告列表
    fetchNoticeList(reset = true) {
      if (reset) {
        this.page = 1;
        this.hasMore = true;
        this.loading = true;
      } else {
        if (!this.hasMore) return;
        this.loadingMore = true;
        // 非重置时页码+1
        this.page++;
      }

      request.post('/sj/notice/list', {
        page: this.page,
        limit: this.limit
      }).then(res => {
        if (res.code === 200 && res.data) {
          const list = res.data.list || [];
          const total = res.data.total || 0;
          this.total = total;
          
          if (reset) {
            this.noticeList = list;
          } else {
            this.noticeList = [...this.noticeList, ...list];
          }
          
          // 判断是否还有更多数据
          this.hasMore = this.noticeList.length < total;
        } else {
          if (reset) this.noticeList = [];
          this.hasMore = false;
          // 非重置且请求失败时回滚页码
          if (!reset && this.page > 1) this.page--;
        }
      }).catch(err => {
        console.error('获取公告列表失败:', err);
        if (!reset && this.page > 1) this.page--; // 回滚页码
        uni.showToast({
          title: '加载失败，请稍后重试',
          icon: 'none'
        });
      }).finally(() => {
        this.loading = false;
        this.loadingMore = false;
        if (reset) {
          uni.stopPullDownRefresh();
        }
      });
    },
    
    // 跳转到详情页（接收 NoticeCard 组件 $emit 传递的 item）
    goToDetail(item) {
      if (item.id) {
        uni.navigateTo({
          url: `/pages/notice/detail?id=${item.id}`
        });
      }
    }
  }
};
</script>

<style lang="scss" scoped>
.notice-page {
  min-height: 100vh;
  background-color: #f5f6f8;
}

.page-content {
  padding: 20rpx 20rpx 40rpx;
}

.loading-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 120rpx 0;
  
  .loading-icon {
    width: 60rpx;
    height: 60rpx;
    border: 4rpx solid #e0e0e0;
    border-top-color: #FF4767;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 20rpx;
  }
  
  .loading-text {
    font-size: 26rpx;
    color: #999;
  }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}
.load-more, .no-more {
  text-align: center;
  padding: 30rpx 0;
  font-size: 24rpx;
  color: #999;
}

.empty-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 150rpx 0;
  
  .empty-img {
    width: 200rpx;
    height: 200rpx;
    margin-bottom: 30rpx;
    opacity: 0.6;
  }
  
  .empty-text {
    font-size: 28rpx;
    color: #999;
  }
}
</style>