import { NextResponse } from "next/server";
import { getLatestTiktokVideo, getTiktokProfile } from "@/lib/followers/tiktok";
import { getRedisClient } from "@/lib/redis";
import { sendDiscordNotification } from "@/lib/discord";

export async function GET(req: Request) {
  try {
    const { searchParams } = new URL(req.url);
    
    // 1. Verify cron secret
    const cronSecret = process.env.CRON_SECRET;
    if (!cronSecret || searchParams.get("secret") !== cronSecret) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    // 2. Fetch the latest video from TikTok API
    const latestVideo = await getLatestTiktokVideo();
    if (!latestVideo) {
      return NextResponse.json({ message: "No videos found or failed to fetch." }, { status: 200 });
    }

    // 3. Check Redis to see if we've already notified about this video
    const redis = await getRedisClient();
    const redisKey = "erika:tiktok_last_video_id";
    const lastVideoId = await redis.get(redisKey);

    if (lastVideoId === latestVideo.id) {
      // Already notified
      return NextResponse.json({ message: "No new videos.", id: latestVideo.id }, { status: 200 });
    }

    // 4. We have a new video! Prepare the notification
    let officialAuthorName = "TikTok";
    let officialAvatarUrl: string | undefined = undefined;
    try {
      const profile = await getTiktokProfile();
      if (profile.displayName) officialAuthorName = profile.displayName;
      if (profile.avatarUrl) officialAvatarUrl = profile.avatarUrl;
    } catch (e) {
      console.error("[TikTok Cron] Failed to fetch profile:", e);
    }

    const message = `ลงคลิปใหม่แล้วววสสสสส ${latestVideo.shareUrl}`;
    const embed = {
      title: latestVideo.title || "คลิปใหม่จาก TikTok",
      url: latestVideo.shareUrl || undefined,
      color: 0xff0050,
      author: {
        name: officialAuthorName,
        url: latestVideo.shareUrl || "https://www.tiktok.com/",
        icon_url: officialAvatarUrl || undefined
      },
      image: latestVideo.coverImageUrl ? { url: latestVideo.coverImageUrl } : undefined
    };

    // 5. Send Discord notification
    await sendDiscordNotification(message, embed);

    // 6. Update Redis with the new video ID
    // We don't set an expiry because we want to remember it forever (until the next video)
    await redis.set(redisKey, latestVideo.id);

    return NextResponse.json({ success: true, message: "New video notified!", id: latestVideo.id }, { status: 200 });
  } catch (error) {
    console.error("[TikTok Cron] Error processing request:", error);
    return NextResponse.json({ error: "Internal Server Error" }, { status: 500 });
  }
}