import { watchAdStart, watchAdReward } from "@/api/system.js";
import { useUserStore } from "@/stores/user";

class AdManager {
  constructor() {
    this.videoAd = null;
    this.rewardToken = "";
    this.isLoaded = false;
    this.adUnitId = "adunit-d7a28e0357d98947"; // Default ID from RewardAd.vue
    this._init();
  }

  _init() {
    if (uni.createRewardedVideoAd) {
      this.videoAd = uni.createRewardedVideoAd({
        adUnitId: this.adUnitId,
      });

      this.videoAd.onLoad(() => {
        console.log("Ad Manager: Ad Loaded");
        this.isLoaded = true;
      });

      this.videoAd.onError((err) => {
        console.error("Ad Manager: Ad Load Error", err);
        this.isLoaded = false;
      });
    }
  }

  /**
   * Show the rewarded video ad.
   * Handles the full flow: start session -> show ad -> verify completion -> claim reward -> refresh assets.
   * @returns {Promise<boolean>} Resolves with true if reward was claimed, false otherwise.
   */
  async showVideoAd() {
    if (!this.videoAd) {
      uni.showToast({ title: "当前环境不支持广告", icon: "none" });
      return false;
    }

    try {
      // Step 1: Start Ad Session
      const startRes = await watchAdStart();
      if (!startRes || !startRes.rewardToken) {
        uni.showToast({ title: "广告启动失败，请稍后再试", icon: "none" });
        return false;
      }
      this.rewardToken = startRes.rewardToken;

      // Step 2: Show Ad
      try {
        await this.videoAd.show();
      } catch (e) {
        // Retry load and show
        await this.videoAd.load();
        await this.videoAd.show();
      }

      // Step 3: Wait for Close
      return new Promise((resolve) => {
        const onCloseHandler = async (res) => {
          this.videoAd.offClose(onCloseHandler); // Clean up listener

          if (res && res.isEnded) {
            // Step 4: Claim Reward
            await this._claimReward(this.rewardToken);
            resolve(true);
          } else {
            uni.showToast({ title: "观看完整广告才能获取奖励哦", icon: "none" });
            resolve(false);
          }
        };

        this.videoAd.onClose(onCloseHandler);
      });

    } catch (e) {
      console.error("Ad Manager: Show failed", e);
      uni.showToast({ title: "广告加载失败，请稍后再试", icon: "none" });
      return false;
    }
  }

  async _claimReward(token) {
    try {
      uni.showLoading({ title: "发放奖励中..." });
      const res = await watchAdReward(token);
      if (res) {
        uni.showToast({
          title: "获得50积分",
          icon: "success",
        });
        // Refresh user assets
        const userStore = useUserStore();
        await userStore.fetchUserAssets();
      }
    } catch (e) {
      console.error("Ad Manager: Reward claim failed", e);
      uni.showToast({ title: "奖励发放失败", icon: "none" });
    } finally {
      uni.hideLoading();
    }
  }
}

export default new AdManager();