import cors from 'cors';
import express from 'express';
import { fileURLToPath } from 'url';
import path from 'path';

import compilerRouter from './routes/compiler.js';

const app = express();
const PORT = Number(process.env.PORT || 5001);
const allowedOrigins = new Set(['http://localhost:5173', 'http://127.0.0.1:5173']);

app.use(
  cors({
    origin(origin, callback) {
      if (!origin || allowedOrigins.has(origin)) {
        callback(null, true);
        return;
      }

      callback(null, false);
    },
    methods: ['GET', 'POST', 'OPTIONS'],
    allowedHeaders: ['Content-Type'],
  }),
);

app.use(express.json({ limit: '300kb' }));

app.get('/health', (_req, res) => {
  res.json({ status: 'ok', service: 'ryp-compiler' });
});

app.use('/api/compile', compilerRouter);

app.use((req, res) => {
  res.status(404).json({
    output: '',
    error: `Route not found: ${req.method} ${req.originalUrl}`,
    executionTime: 0,
    status: 'not_found',
  });
});

app.use((err, _req, res, _next) => {
  res.status(500).json({
    output: '',
    error: err?.message || 'Unexpected compiler server error.',
    executionTime: 0,
    status: 'server_error',
  });
});

const currentFile = fileURLToPath(import.meta.url);
const executedFile = process.argv[1] ? path.resolve(process.argv[1]) : '';

if (currentFile === executedFile) {
  app.listen(PORT, '127.0.0.1', () => {
    console.log(`RYP compiler server running on http://127.0.0.1:${PORT}`);
  });
}

export default app;