app/api/auth/login-url/route.ts

import { NextRequest, NextResponse } from "next/server";

export async function GET(req: NextRequest) {
  const host = req.headers.get("host") ?? "localhost:3000";
  const baseFromEnv = process.env.PUBLIC_BASE_URL?.trim();
  const isLocal = (baseFromEnv || host).includes("localhost");
  const protocol = isLocal ? "http" : "https";
  const baseUrl = baseFromEnv || `${protocol}://${host}`;
  const redirectPath = process.env.AUTH_REDIRECT_PATH || "/auth/callback";
  const redirect_uri = `${baseUrl}${redirectPath}`;

  const loginRedirectUrl = `https://huggingface.co/oauth/authorize?client_id=${process.env.OAUTH_CLIENT_ID}&redirect_uri=${redirect_uri}&response_type=code&scope=openid%20profile%20write-repos%20manage-repos%20inference-api&prompt=consent&state=1234567890`;
  
  return NextResponse.json({ loginUrl: loginRedirectUrl });
}