import { NextResponse } from "next/server";
import { auth } from "@/lib/auth";
import { getTikTokAuthUrl, generateCodeVerifier, generateCodeChallenge } from "@/lib/tiktok";
import { prisma } from "@/lib/prisma";

export async function GET() {
    const session = await auth();

    if (!session?.user) {
        return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    const userId = (session.user as { id?: string }).id;
    if (!userId) {
        return NextResponse.json({ error: "Session error" }, { status: 401 });
    }

    const state = crypto.randomUUID();
    const codeVerifier = generateCodeVerifier();
    const codeChallenge = await generateCodeChallenge(codeVerifier);

    console.log("[TikTok PKCE] verifier:", codeVerifier);
    console.log("[TikTok PKCE] challenge:", codeChallenge);
    console.log("[TikTok PKCE] verifier length:", codeVerifier.length);

    // Stocker state + verifier + userId en DB
    await prisma.tikTokPKCE.create({
        data: { state, codeVerifier, userId },
    });

    const authUrl = getTikTokAuthUrl(state, codeChallenge);
    console.log("[TikTok PKCE] authUrl:", authUrl);
    return NextResponse.redirect(authUrl);
}