<template>
  <view
    class="wallpaper-page"
    :style="{ paddingTop: getBavBarHeight() + 'px' }"
  >
    <!-- Custom Navbar -->
    <view class="nav-bar">
      <view class="back" @tap="goBack">‹</view>
      <text class="nav-title">新春精美壁纸</text>
    </view>

    <!-- Category Tabs -->
    <view class="category-tabs">
      <scroll-view scroll-x class="tabs-scroll" :show-scrollbar="false">
        <view class="tabs-content">
          <view
            v-for="(item, index) in categories"
            :key="index"
            class="tab-item"
            :class="{ active: currentCategoryId === item.id }"
            @tap="switchCategory(item.id)"
          >
            {{ item.name }}
          </view>
        </view>
      </scroll-view>
    </view>

    <!-- Wallpaper Grid -->
    <scroll-view
      scroll-y
      class="wallpaper-scroll"
      @scrolltolower="loadMore"
      refresher-enabled
      :refresher-triggered="isRefreshing"
      @refresherrefresh="onRefresh"
    >
      <view class="grid-container">
        <view
          class="grid-item"
          v-for="(item, index) in wallpapers"
          :key="index"
        >
          <image
            :src="item.imageUrl"
            mode="aspectFill"
            class="wallpaper-img"
            @tap="previewImage(index)"
          />
          <view class="action-overlay">
            <view
              class="action-btn download"
              @tap.stop="downloadWallpaper(item)"
            >
              <text class="icon">↓</text>
            </view>
            <view class="action-btn share" @tap.stop="shareWallpaper(item)">
              <text class="icon">➦</text>
            </view>
          </view>
        </view>
      </view>

      <!-- Loading State -->
      <view class="loading-state" v-if="loading">
        <text>加载中...</text>
      </view>
      <view class="empty-state" v-if="!loading && wallpapers.length === 0">
        <text>暂无壁纸</text>
      </view>
      <view
        class="no-more"
        v-if="!loading && !hasMore && wallpapers.length > 0"
      >
        <text>没有更多了</text>
      </view>
    </scroll-view>
  </view>
</template>

<script setup>
import { ref, onMounted } from "vue";
import { getBavBarHeight } from "@/utils/system";
import { getWallpaperList, getWallpaperCategoryList } from "@/api/wallpaper.js";

const categories = ref([]);
const currentCategoryId = ref(null);
const wallpapers = ref([]);
const page = ref(1);
const loading = ref(false);
const hasMore = ref(true);
const isRefreshing = ref(false);

onMounted(async () => {
  await fetchCategories();
});

const goBack = () => {
  uni.navigateBack();
};

const fetchCategories = async () => {
  try {
    const res = await getWallpaperCategoryList();
    const list = Array.isArray(res) ? res : res?.list || [];
    if (list.length > 0) {
      categories.value = list;
      currentCategoryId.value = list[0].id;
      loadWallpapers(true);
    }
  } catch (e) {
    console.error("Failed to fetch categories", e);
    uni.showToast({ title: "获取分类失败", icon: "none" });
  }
};

const switchCategory = (id) => {
  if (currentCategoryId.value === id) return;
  currentCategoryId.value = id;
  loadWallpapers(true);
};

const loadWallpapers = async (reset = false) => {
  if (loading.value) return;
  if (reset) {
    page.value = 1;
    hasMore.value = true;
    wallpapers.value = [];
  }
  if (!hasMore.value) return;

  loading.value = true;
  try {
    const res = await getWallpaperList(currentCategoryId.value, page.value);
    const list = res?.list || [];
    hasMore.value = !!res?.hasNext;

    if (reset) {
      wallpapers.value = list;
    } else {
      wallpapers.value = [...wallpapers.value, ...list];
    }

    if (hasMore.value) {
      page.value++;
    }
  } catch (e) {
    console.error("Failed to fetch wallpapers", e);
    uni.showToast({ title: "获取壁纸失败", icon: "none" });
  } finally {
    loading.value = false;
    isRefreshing.value = false;
  }
};

const loadMore = () => {
  loadWallpapers();
};

const onRefresh = () => {
  isRefreshing.value = true;
  loadWallpapers(true);
};

const previewImage = (index) => {
  const urls = wallpapers.value.map((item) => item.url);
  uni.previewImage({
    urls,
    current: index,
  });
};

const downloadWallpaper = (item) => {
  uni.showLoading({ title: "下载中..." });
  uni.downloadFile({
    url: item.url,
    success: (res) => {
      if (res.statusCode === 200) {
        uni.saveImageToPhotosAlbum({
          filePath: res.tempFilePath,
          success: () => {
            uni.hideLoading();
            uni.showToast({ title: "保存成功", icon: "success" });
          },
          fail: (err) => {
            uni.hideLoading();
            console.error(err);
            uni.showToast({ title: "保存失败", icon: "none" });
          },
        });
      } else {
        uni.hideLoading();
        uni.showToast({ title: "下载失败", icon: "none" });
      }
    },
    fail: () => {
      uni.hideLoading();
      uni.showToast({ title: "下载失败", icon: "none" });
    },
  });
};

const shareWallpaper = (item) => {
  // uni.share is for App, specific provider.
  // For general sharing, we might just preview it or use button open-type="share" if it was a button component.
  // Since this is a custom UI, we can guide user to preview and long press, or just preview.
  // Or if on MP-Weixin, show share menu.
  uni.previewImage({
    urls: [item.url],
  });
  // uni.showToast({ title: '长按图片发送给朋友', icon: 'none' });
};
</script>

<style lang="scss" scoped>
.wallpaper-page {
  height: 100vh;
  background-color: #7a0909; /* Dark Red Background */
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}

.nav-bar {
  display: flex;
  align-items: center;
  padding: 16rpx 24rpx;
  /* background: #7A0909; */
  position: sticky;
  top: 0;
  z-index: 100;
}

.back {
  font-size: 50rpx;
  margin-right: 24rpx;
  line-height: 1;
  color: #ffd700; /* Gold */
}

.nav-title {
  font-size: 34rpx;
  font-weight: 600;
  color: #ffd700; /* Gold */
}

.category-tabs {
  padding: 20rpx 0;
  /* background-color: #7A0909; */
}

.tabs-scroll {
  white-space: nowrap;
  width: 100%;
}

.tabs-content {
  display: inline-flex;
  padding: 0 24rpx;
  gap: 20rpx;
}

.tab-item {
  padding: 12rpx 32rpx;
  border-radius: 999rpx;
  font-size: 28rpx;
  color: #ffd700;
  background: rgba(0, 0, 0, 0.3);
  border: 2rpx solid transparent;
  transition: all 0.3s;
}

.tab-item.active {
  background: linear-gradient(90deg, #ff3b30 0%, #ff9500 100%);
  color: #fff;
  border-color: #ffd700;
  font-weight: 600;
  box-shadow: 0 4rpx 12rpx rgba(255, 215, 0, 0.3);
}

.wallpaper-scroll {
  flex: 1;
  overflow: hidden;
  /* padding: 24rpx; */
  box-sizing: border-box;
}

.grid-container {
  display: flex;
  flex-wrap: wrap;
  padding: 24rpx;
  justify-content: space-between;
}

.grid-item {
  width: 340rpx;
  height: 600rpx;
  border-radius: 24rpx;
  overflow: hidden;
  margin-bottom: 24rpx;
  position: relative;
  box-shadow: 0 8rpx 16rpx rgba(0, 0, 0, 0.3);
  background: #333;
}

.wallpaper-img {
  width: 100%;
  height: 100%;
}

.action-overlay {
  position: absolute;
  bottom: 20rpx;
  right: 20rpx;
  display: flex;
  flex-direction: column;
  gap: 16rpx;
}

.action-btn {
  width: 64rpx;
  height: 64rpx;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1rpx solid rgba(255, 255, 255, 0.3);
}

.action-btn .icon {
  color: #fff;
  font-size: 32rpx;
  font-weight: bold;
}

.action-btn.share .icon {
  font-size: 28rpx;
}

.loading-state,
.empty-state,
.no-more {
  text-align: center;
  padding: 40rpx;
  color: rgba(255, 255, 255, 0.6);
  font-size: 24rpx;
}
</style>
