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

const API_URL = process.env.CLAUSEGUARD_API_URL || "https://gaurv007-clauseguard-api.hf.space";

export async function POST(req: NextRequest) {
  try {
    const body = await req.json();
    const { session_id, text, use_llm } = body;

    if (!session_id && !text) {
      return NextResponse.json(
        { error: "Provide session_id or text" },
        { status: 400 }
      );
    }

    const response = await fetch(`${API_URL}/api/redline`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ session_id, text, use_llm: use_llm ?? true }),
    });

    if (!response.ok) {
      const err = await response.text().catch(() => "");
      throw new Error(err || `Backend error: ${response.status}`);
    }

    const result = await response.json();
    return NextResponse.json(result);
  } catch (error: any) {
    console.error("Redline error:", error.message);
    return NextResponse.json(
      { error: error.message || "Redlining failed" },
      { status: 500 }
    );
  }
}