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

/**
 * Smart Proxy for Umami Analytics.
 *
 * This Route Handler receives tracking events from the browser,
 * injects the secret UMAMI_WEBSITE_ID, and forwards them to the
 * internal Umami API endpoint.
 *
 * This ensures:
 * 1. The Website ID is NOT leaked to the client bundle.
 * 2. The Umami API endpoint is hidden behind our domain.
 * 3. We have full control over the tracking data.
 */
export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const { type, payload } = body;

    // Inject the secret websiteId from server config
    const websiteId = env.UMAMI_WEBSITE_ID || env.NEXT_PUBLIC_UMAMI_WEBSITE_ID;

    if (!websiteId) {
      console.warn(
        "Umami tracking received but no Website ID configured on server",
      );
      return NextResponse.json({ status: "ignored" }, { status: 200 });
    }

    // Prepare the enhanced payload with the secret ID
    const enhancedPayload = {
      ...payload,
      website: websiteId,
    };

    const umamiEndpoint = env.UMAMI_API_ENDPOINT;

    // Log the event (debug only)
    if (process.env.NODE_ENV === "development") {
      console.debug("Forwarding analytics event", {
        type,
        url: payload.url,
        website: websiteId.slice(0, 8) + "...",
      });
    }

    const response = await fetch(`${umamiEndpoint}/api/send`, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        "User-Agent": request.headers.get("user-agent") || "Mintel-Smart-Proxy",
        "X-Forwarded-For": request.headers.get("x-forwarded-for") || "",
      },
      body: JSON.stringify({ type, payload: enhancedPayload }),
    });

    if (!response.ok) {
      const errorText = await response.text();
      console.error("Umami API responded with error", {
        status: response.status,
        error: errorText.slice(0, 100),
      });
      return new NextResponse(errorText, { status: response.status });
    }

    return NextResponse.json({ status: "ok" });
  } catch (error) {
    console.error("Failed to proxy analytics request", {
      error: (error as Error).message,
    });
    return NextResponse.json(
      { error: "Internal Server Error" },
      { status: 500 },
    );
  }
}