import { NextRequest, NextResponse } from "next/server";
import {
  applyAuthResponseCookies,
  buildBackendRequestHeaders,
  requireBackendAuthUser,
} from "@/lib/backend-auth";
import {
  buildProxyExceptionResponse,
  buildUpstreamErrorResponse,
} from "@/lib/api-proxy";

const API_BASE = process.env.POLYWEATHER_API_BASE_URL;

export async function POST(
  req: NextRequest,
  context: { params: Promise<{ intentId: string }> },
) {
  if (!API_BASE) {
    return NextResponse.json(
      { error: "POLYWEATHER_API_BASE_URL is not configured" },
      { status: 500 },
    );
  }
  const { intentId } = await context.params;
  try {
    const body = await req.json();
    const auth = await buildBackendRequestHeaders(req);
    const authError = requireBackendAuthUser(auth);
    if (authError) return authError;
    const proxiedHeaders = new Headers(auth.headers);
    proxiedHeaders.set("Content-Type", "application/json");
    const res = await fetch(
      `${API_BASE}/api/payments/intents/${encodeURIComponent(intentId)}/validate`,
      {
        method: "POST",
        headers: proxiedHeaders,
        body: JSON.stringify(body ?? {}),
        cache: "no-store",
      },
    );
    if (!res.ok) {
      const raw = await res.text();
      let detail = raw.slice(0, 350);
      try {
        const parsed = JSON.parse(raw);
        if (parsed.detail) detail = String(parsed.detail).slice(0, 350);
      } catch {}
      const response = buildUpstreamErrorResponse(res.status, raw, {
        detailLimit: 350,
        error: detail || undefined,
      });
      return applyAuthResponseCookies(response, auth.response);
    }
    const data = await res.json();
    const response = NextResponse.json(data);
    return applyAuthResponseCookies(response, auth.response);
  } catch (error) {
    return buildProxyExceptionResponse(error, {
      publicMessage: "Failed to validate payment tx",
    });
  }
}