import { NextResponse } from "next/server";

const BREVO_API_KEY = process.env.BREVO_API_KEY;
const BREVO_LIST_ID = process.env.BREVO_LIST_ID; // optional

export async function POST(req: Request) {
  if (!BREVO_API_KEY) {
    console.error("BREVO_API_KEY is not set");
    return NextResponse.json(
      { error: "Server not configured" },
      { status: 500 }
    );
  }

  try {
    const { email } = await req.json();

    if (!email || typeof email !== "string") {
      return NextResponse.json(
        { error: "Valid email is required" },
        { status: 400 }
      );
    }

    // Brevo contacts API
    const res = await fetch("https://api.brevo.com/v3/contacts", {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        "api-key": BREVO_API_KEY,
      },
      body: JSON.stringify({
        email,
        updateEnabled: true, // update if already exists
        ...(BREVO_LIST_ID
          ? { listIds: [Number(BREVO_LIST_ID)] }
          : {}),
        attributes: {
          SOURCE: "Battl Builders Beta",
        },
      }),
    });

    if (!res.ok) {
      const text = await res.text();
      console.error("Brevo error:", res.status, text);
      return NextResponse.json(
        { error: "Failed to subscribe" },
        { status: 500 }
      );
    }

    return NextResponse.json({ ok: true });
  } catch (err) {
    console.error(err);
    return NextResponse.json(
      { error: "Something went wrong" },
      { status: 500 }
    );
  }
}