import type { NextConfig } from "next";

function publicAppHostname(): string | null {
  const url = process.env.NEXT_PUBLIC_APP_URL;
  if (!url) return null;
  try {
    return new URL(url).hostname;
  } catch {
    return null;
  }
}

const appHost = publicAppHostname();

/** @type {import('next').NextConfig} */
const nextConfig = {
  // Enable React strict mode
  reactStrictMode: true,
  
  // Disable x-powered-by header for security
  poweredByHeader: false,
  
  // Configure allowed remote image sources (hostname derived from NEXT_PUBLIC_APP_URL at build time)
  images: {
    remotePatterns: [
      { protocol: "http", hostname: "localhost" },
      ...(appHost
        ? [
            { protocol: "http" as const, hostname: appHost },
            { protocol: "https" as const, hostname: appHost },
          ]
        : []),
      { protocol: "https", hostname: "dyolink.com" },
      { protocol: "https", hostname: "www.dyolink.com" },
    ],
  },
  
  // Environment variables that will be available at build time
  env: {
    NEXT_PUBLIC_APP_NAME: process.env.NEXT_PUBLIC_APP_NAME,
    NEXT_PUBLIC_APP_URL: process.env.NEXT_PUBLIC_APP_URL,
    NEXT_PUBLIC_API_URL: process.env.NEXT_PUBLIC_API_URL,
  },
  
  // Output configuration
  output: 'standalone',  // Reduces Docker image size
  
  // Compress with gzip
  compress: true,
}

module.exports = nextConfig