<template>
  <view class="wallpaper-page">
    <NavBar title="精美壁纸" />

    <!-- 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>

    <!-- Points Info -->
    <view class="points-bar">
      <view class="points-left">
        <uni-icons type="download" size="14" color="#ff9800" />
        <text>每次下载消耗 {{ downloadCost }} 积分</text>
      </view>
      <view class="points-right">
        <text>当前积分：</text>
        <text class="score-val">{{ userScore }}</text>
      </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="getThumbUrl(item.imageUrl)"
            mode="aspectFill"
            class="wallpaper-img"
            @tap="previewImage(index)"
          />
          <view class="action-overlay">
            <button
              class="action-btn share"
              open-type="share"
              :data-item="item"
              @tap.stop="shareWallpaper(item)"
            >
              <text class="icon">➦</text>
            </button>
            <view
              class="action-btn download"
              @tap.stop="downloadWallpaper(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>

    <LoginPopup
      ref="loginPopupRef"
      @logind="handleLogind"
      :share-token="shareToken"
    />
    <RewardAd ref="rewardAdRef" @onReward="handleAdReward" />
  </view>
</template>

<script setup>
import { ref, computed } from "vue";
import { getWallpaperList, getWallpaperCategoryList } from "@/api/wallpaper.js";
import {
  saveRemoteImageToLocal,
  saveRecordRequest,
  getShareToken,
} from "@/utils/common.js";
import { onShareAppMessage, onShareTimeline, onLoad } from "@dcloudio/uni-app";
import { getShareReward, watchAdReward } from "@/api/system.js";
import { checkAbilityAndHandle } from "@/utils/ability.js";
import { useUserStore } from "@/stores/user";
import { saveViewRequest, trackRecord } from "@/utils/common.js";
import NavBar from "@/components/NavBar/NavBar.vue";
import RewardAd from "@/components/RewardAd/RewardAd.vue";

const userStore = useUserStore();
const loginPopupRef = ref(null);
const rewardAdRef = ref(null);

const isLoggedIn = computed(() => !!userStore.userInfo.nickName);
const userScore = computed(() => userStore.userInfo.points || 0);
const downloadCost = ref(20);

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);
const shareToken = ref("");

onShareAppMessage(async (options) => {
  if (!isLoggedIn.value) {
    const shareToken = await getShareToken("wallpaper_download_index", "");
    return {
      title: "新年好运已送达 🎊｜祝福卡·头像·壁纸",
      path: `/pages/index/index?shareToken=${shareToken}`,
      imageUrl:
        "https://file.lihailezzc.com/resource/8dd026d76ef7a63d123b7fd698fb989b.png",
    };
  }
  getShareReward({ scene: "wallpaper_download" });
  if (options.from === "button") {
    const shareToken = await getShareToken(
      "wallpaper_download",
      options?.target?.dataset?.item?.id,
    );
    return {
      title: "快来挑选喜欢的新春壁纸吧",
      path: `/pages/wallpaper/detail?shareToken=${shareToken}`,
    };
  } else {
    const shareToken = await getShareToken("wallpaper_download_index", "");
    return {
      title: "新年好运已送达 🎊｜祝福卡·头像·壁纸",
      path: `/pages/index/index?shareToken=${shareToken}`,
      imageUrl:
        "https://file.lihailezzc.com/resource/8dd026d76ef7a63d123b7fd698fb989b.png",
    };
  }
});

onShareTimeline(async () => {
  const shareToken = await getShareToken("wallpaper_timeline");
  return {
    title: "精选新年壁纸，让手机也过年 🖼",
    query: `shareToken=${shareToken}`,
    imageUrl:
      "https://file.lihailezzc.com/resource/8dd026d76ef7a63d123b7fd698fb989b.png",
  };
});

onLoad((options) => {
  fetchCategories();
  if (options.shareToken) {
    shareToken.value = options.shareToken;
    saveViewRequest(options.shareToken, "wallpaper_download");
  }
  if (options.categoryId) {
    currentCategoryId.value = options.categoryId;
  }
  fetchCategories();
  trackRecord({
    eventName: "wallpaper_page_visit",
    eventType: `visit`,
  });
});

const getThumbUrl = (url) => {
  return `${url}?imageView2/1/w/340/h/600/q/80`;
};

const fetchCategories = async () => {
  try {
    const res = await getWallpaperCategoryList();
    const list = Array.isArray(res) ? res : res?.list || [];
    if (list.length > 0) {
      categories.value = list;
      if (!currentCategoryId.value) {
        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);
  trackRecord({
    eventName: "wallpaper_category_click",
    eventType: `select`,
    elementId: id || "",
  });
};

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 handleLogind = async () => {
  // Logic after successful login if needed
};

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

const previewImage = (index) => {
  // const urls = wallpapers.value.map((item) => item.url);
  // uni.previewImage({
  //   urls,
  //   current: index,
  // });
  const item = wallpapers.value[index];
  trackRecord({
    eventName: "wallpaper_preview_click",
    eventType: `select`,
    elementId: item?.id || "",
  });
};

const handleAdReward = async (token) => {
  try {
    const res = await watchAdReward(token);
    if (res) {
      uni.showToast({
        title: "获得50积分",
        icon: "success",
      });
      await userStore.fetchUserAssets();
    }
  } catch (e) {
    console.error("Reward claim failed", e);
    uni.showToast({ title: "奖励发放失败", icon: "none" });
  }
};

const downloadWallpaper = async (item) => {
  trackRecord({
    eventName: "wallpaper_download_click",
    eventType: `click`,
    elementId: item?.id || "",
  });
  if (!isLoggedIn.value) {
    loginPopupRef.value.open();
    return;
  }

  const canProceed = await checkAbilityAndHandle(
    "wallpaper_download",
    rewardAdRef,
  );
  if (!canProceed) return;

  uni.showLoading({ title: "下载中..." });
  try {
    // Parallelize save record and download
    // Wait for saveRecordRequest to ensure backend deducts points
    await Promise.all([
      saveRecordRequest("", item.id, "wallpaper_download", item.imageUrl),
      saveRemoteImageToLocal(item.imageUrl),
    ]);

    // Refresh user assets to show updated points
    await userStore.fetchUserAssets();

    uni.hideLoading();
    uni.showToast({ title: "保存成功 消耗 20 积分", icon: "success" });
  } catch (e) {
    uni.hideLoading();
    console.error("Download failed", e);
    uni.showToast({ title: "下载失败", icon: "none" });
  }
};

const shareWallpaper = (item) => {};
</script>

<style lang="scss" scoped>
.wallpaper-page {
  height: 100vh;
  background-color: #ffffff;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}

.category-tabs {
  padding: 0;
  background-color: #ffffff;
  border-bottom: 1rpx solid #eeeeee;
  position: sticky;
  top: 0;
  z-index: 100;
}

.points-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16rpx 30rpx;
  background-color: #fffbf0;
  font-size: 24rpx;
  color: #666;
}

.points-left {
  display: flex;
  align-items: center;
  gap: 8rpx;
  color: #ff9800;
}

.points-right {
  display: flex;
  align-items: center;
}

.score-val {
  color: #d81e06;
  font-weight: bold;
  font-size: 28rpx;
  margin-left: 4rpx;
}

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

.tabs-content {
  display: inline-flex;
  padding: 0 30rpx;
}

.tab-item {
  padding: 24rpx 30rpx;
  font-size: 30rpx;
  color: #999999;
  position: relative;
  transition: all 0.3s;
  font-weight: 500;
}

.tab-item.active {
  color: #e60012;
  font-weight: bold;

  &::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80rpx;
    height: 4rpx;
    background-color: #e60012;
    border-radius: 2rpx;
  }
}

.wallpaper-scroll {
  flex: 1;
  overflow: hidden;
  box-sizing: border-box;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30rpx;
  padding: 30rpx;
}

.grid-item {
  height: 600rpx;
  border-radius: 32rpx;
  overflow: hidden;
  position: relative;
  background: #f5f5f5;
}

.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, 0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1rpx solid rgba(255, 255, 255, 0.2);
  padding: 0;
  margin: 0;
  line-height: 1;

  &::after {
    border: none;
  }
}

.action-btn.share .icon {
  font-size: 30rpx;
}

.action-btn .icon {
  color: #fff;
  font-size: 36rpx;
  font-weight: normal;
}

.loading-state,
.empty-state,
.no-more {
  text-align: center;
  padding: 40rpx;
  color: #999999;
  font-size: 24rpx;
}
</style>
