import { NextResponse } from "next/server";
import { getTiktokProfile } from "@/lib/followers/tiktok";

export async function POST(req: Request) {
  try {
    if (process.env.TIKTOK_WEBHOOK_SECRET) {
      const { searchParams } = new URL(req.url);
      if (searchParams.get("secret") !== process.env.TIKTOK_WEBHOOK_SECRET) {
        console.error("[TikTok Webhook] Unauthorized request: invalid or missing secret query parameter.");
        return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
      }
    }

    // Read the body as text first in case it's not JSON or for signature verification if needed
    const rawBody = await req.text();
    let body: any = {};
    
    if (rawBody) {
      try {
        body = JSON.parse(rawBody);
      } catch (e) {
        console.error("[TikTok Webhook] Failed to parse JSON:", rawBody);
      }
    }

    console.log("[TikTok Webhook] Received payload:", JSON.stringify(body, null, 2));

    const event = body.event || body.type || body.Event;
    const data = body.data || body.Data || body;
    
    let message = "";
    let embed: any = null;
    
    // Fetch the user's official TikTok profile to use for author name & avatar
    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 Webhook] Failed to fetch profile:", e);
    }
    
    // Check if it's a video upload or live event
    if (typeof event === "string") {
      const eventLower = event.toLowerCase();
      if (eventLower.includes("video") && (eventLower.includes("upload") || eventLower.includes("publish"))) {
        const link = data.share_url || data.url || data.video_url || data.link || "";
        
        let title = data.title || data.video_title || data.desc || "คลิปใหม่จาก TikTok";
        let thumbnailUrl = data.cover_url || data.thumbnail_url || "";
        
        // Default to official profile info
        let authorName = officialAuthorName;
        let authorAvatar = officialAvatarUrl || "";

        if (link && link.includes("tiktok.com")) {
          try {
            // Using tikwm API for video thumbnail and title
            const oembedRes = await fetch(`https://www.tikwm.com/api/?url=${encodeURIComponent(link)}`);
            if (oembedRes.ok) {
              const oembedData = await oembedRes.json();
              if (oembedData.data) {
                if (oembedData.data.title) title = oembedData.data.title;
                if (oembedData.data.cover) thumbnailUrl = oembedData.data.cover;
                // If the official API failed for some reason, fallback to tikwm author info
                if (officialAuthorName === "TikTok" && oembedData.data.author?.nickname) authorName = oembedData.data.author.nickname;
                if (!officialAvatarUrl && oembedData.data.author?.avatar) authorAvatar = oembedData.data.author.avatar;
              }
            }
          } catch (e) {
            console.error("[TikTok Webhook] Failed to fetch video info:", e);
          }
        }

        message = `ลงคลิปใหม่แล้วววสสสสส ${link}`;
        embed = {
          title: title,
          url: link || undefined,
          color: 0xff0050,
          author: {
            name: authorName,
            url: link || "https://www.tiktok.com/",
            icon_url: authorAvatar || undefined
          },
          image: thumbnailUrl ? { url: thumbnailUrl } : undefined
        };
      } else if (eventLower.includes("live")) {
        const link = data.share_url || data.url || data.room_url || data.link || "";
        const title = data.title || data.live_title || data.desc || "";

        message = `${link}`;
        embed = {
          title: title,
          url: link || undefined,
          color: 0xff0050,
          author: {
            name: officialAuthorName,
            url: "https://www.tiktok.com/",
            icon_url: officialAvatarUrl || undefined
          },
          thumbnail: officialAvatarUrl ? { url: officialAvatarUrl } : undefined
        };
      }
    } else {
      // Fallback: search payload keys for indicators
      const payloadStr = JSON.stringify(body).toLowerCase();
      if (payloadStr.includes("video") && (payloadStr.includes("upload") || payloadStr.includes("publish"))) {
        message = `คลิปใหม่!`;
      } else if (payloadStr.includes("live")) {
        message = `Live!`;
      }
    }

    if (message) {
      await sendDiscordNotification(message, embed);
    }

    return NextResponse.json({ success: true }, { status: 200 });
  } catch (error) {
    console.error("[TikTok Webhook] Error processing request:", error);
    return NextResponse.json({ error: "Internal Server Error" }, { status: 500 });
  }
}

async function sendDiscordNotification(content: string, embed?: any) {
  const token = process.env.DISCORD_BOT_TOKEN;
  const channelId = process.env.DISCORD_CHANNEL_ID;

  if (!token) {
    console.error("[TikTok Webhook] Missing DISCORD_BOT_TOKEN");
    return;
  }
  
  if (!channelId) {
    console.error("[TikTok Webhook] Missing DISCORD_CHANNEL_ID environment variable. Please add it to your .env file.");
    return;
  }

  try {
    const res = await fetch(`https://discord.com/api/v10/channels/${channelId}/messages`, {
      method: "POST",
      headers: {
        "Authorization": `Bot ${token}`,
        "Content-Type": "application/json"
      },
      body: JSON.stringify({
        content,
        embeds: embed ? [embed] : undefined
      })
    });

    if (!res.ok) {
      console.error("[TikTok Webhook] Failed to send Discord message:", await res.text());
    } else {
      console.log("[TikTok Webhook] Successfully sent Discord message");
    }
  } catch (error) {
    console.error("[TikTok Webhook] Error sending Discord message:", error);
  }
}