import fs from 'node:fs';
import type { ServerOptions as HttpsServerOptions } from 'node:https';
import path from 'node:path';
import { defineConfig, loadEnv } from 'vite';
import react from '@vitejs/plugin-react';

export default defineConfig(({ mode }) => {
  const env = loadEnv(mode, process.cwd(), '');
  const apiPort = Number(env.PORT ?? 5000);
  const httpsOptions = getHttpsOptions(env);
  const apiProtocol = httpsOptions ? 'https' : 'http';

  return {
    plugins: [react()],
    server: {
      https: httpsOptions,
      port: 5173,
      strictPort: true,
      proxy: {
        '/api': {
          target: `${apiProtocol}://127.0.0.1:${apiPort}`,
          changeOrigin: true,
          secure: false
        }
      }
    }
  };
});

const getConfiguredPath = (value: string | undefined) =>
  value ? path.resolve(process.cwd(), value) : undefined;

const getHttpsOptions = (
  env: Record<string, string>
): HttpsServerOptions | undefined => {
  const keyPath = getConfiguredPath(env.HTTPS_KEY_PATH);
  const certPath = getConfiguredPath(env.HTTPS_CERT_PATH);

  if (!keyPath && !certPath) return undefined;

  if (!keyPath || !certPath) {
    throw new Error('HTTPS_KEY_PATH and HTTPS_CERT_PATH must both be set.');
  }

  return {
    key: fs.readFileSync(keyPath),
    cert: fs.readFileSync(certPath)
  };
};