/**
 * EduRecommender — Express server entry point.
 *
 * Serves the React frontend (static build) and the REST API.
 * Designed for Docker-based deployment on HuggingFace Spaces.
 */

// MUST be the first import — loads .env before any other module reads process.env
import "./env.js";

import express from "express";
import cors from "cors";
import helmet from "helmet";
import compression from "compression";
import { fileURLToPath } from "url";
import { dirname, join } from "path";

import { apiRouter } from "./routes.js";

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const PORT = process.env.PORT || 7860;
const app = express();

// ---------------------------------------------------------------------------
// Middleware
// ---------------------------------------------------------------------------
app.use(helmet({ contentSecurityPolicy: false, frameguard: false }));
app.use(compression());
app.use(cors());
app.use(express.json());

// ---------------------------------------------------------------------------
// API routes
// ---------------------------------------------------------------------------
app.use("/api", apiRouter);

// ---------------------------------------------------------------------------
// Serve React build (production)
// ---------------------------------------------------------------------------
const clientBuild = join(__dirname, "../../client/dist");
app.use(express.static(clientBuild));
app.get("*", (_req, res) => {
  res.sendFile(join(clientBuild, "index.html"));
});

// ---------------------------------------------------------------------------
// Start
// ---------------------------------------------------------------------------
app.listen(PORT, "0.0.0.0", () => {
  console.log(`[EduRecommender] Server running on http://0.0.0.0:${PORT}`);
  console.log(`[EduRecommender] HF_TOKEN: ${process.env.HF_TOKEN ? "configured" : "not set"}`);
});