import type { NextConfig } from "next";
import dotenv from "dotenv";
import path from "path";
import bundleAnalyzer from "@next/bundle-analyzer";
import createNextIntlPlugin from "next-intl/plugin";
// Load the .env file from the working directory
dotenv.config({ path: path.resolve(process.cwd(), ".env") });

const nextConfig: NextConfig = {
  // Enable standalone output for Docker
  output: "standalone",
  outputFileTracingRoot: path.join(process.cwd()),

  // Optimize for production
  compress: true,
  poweredByHeader: false,

  // React Strict Mode
  // In dev, React StrictMode double-mount can cause visible animation flicker
  // (Framer Motion "fade starts, disappears, then pops").
  reactStrictMode: process.env.NODE_ENV === "production",

  // Disable ESLint during build for Docker
  eslint: {
    ignoreDuringBuilds: process.env.NODE_ENV === "production",
  },

  // Environment variables
  env: {
    NEXT_PUBLIC_BASE_URL: process.env.NEXT_PUBLIC_BASE_URL,
  },

  // Performance optimizations
  experimental: {
    // Tree-shake barrel-file packages in both dev and production
    optimizePackageImports: ["lucide-react", "framer-motion", "@tiptap/react"],
    // Merge all CSS into a single chunk to eliminate the render-blocking CSS chain
    // (84dc7384.css → 3aefc04b.css sequential dependency reported by PageSpeed).
    cssChunking: false,
    // Note: optimizeCss (critters) is intentionally disabled — it converts the main
    // <link rel="stylesheet"> to a JS-deferred preload, which PageSpeed reads as a
    // sequential CSS chain and reports 410ms of render-blocking.
    ...(process.env.NODE_ENV !== "production" ? { webpackBuildWorker: true } : {}),
  },

  // Image optimization
  images: {
    formats: ["image/webp", "image/avif"],
    minimumCacheTTL: 2592000,
    deviceSizes: [640, 768, 1024, 1280, 1536],
    imageSizes: [16, 32, 48, 64, 96, 128, 256],
    remotePatterns: [
      {
        protocol: "https",
        hostname: "i.scdn.co",
      },
      {
        protocol: "https",
        hostname: "cdn.discordapp.com",
      },
      {
        protocol: "https",
        hostname: "media.discordapp.net",
      },
      {
        protocol: "https",
        hostname: "cms.dk0.dev",
      },
      {
        protocol: "https",
        hostname: "assets.hardcover.app",
      },
      {
        protocol: "https",
        hostname: "dki.one",
      },
      {
        protocol: "https",
        hostname: "images.unsplash.com",
      },
    ],
  },

  // Webpack configuration
  webpack: (config, { dev, isServer, webpack }) => {
    // Skip adding polyfill webpack aliases — Next.js injects polyfills via <script>
    // tags, not through webpack module resolution, so aliases don't take effect.
    // The browserslist targets (chrome >= 100, etc.) already prevent unnecessary
    // transpilation; the 11.7 KiB polyfill chunk is a known Next.js limitation.

    // Fix for module resolution issues
    config.resolve.fallback = {
      ...config.resolve.fallback,
      fs: false,
      net: false,
      tls: false,
    };

    // Optimize webpack cache - fix "Serializing big strings" warnings in dev by avoiding FS cache
    if (dev) {
      config.cache = {
        type: "memory",
        maxGenerations: 5,
      };

      if (!isServer) {
        // Suppress framer-motion source map errors in development
        config.plugins.push(
          new webpack.SourceMapDevToolPlugin({
            filename: "[file].map",
            exclude: [/framer-motion/, /LayoutGroupContext/],
          })
        );
      }
    }

    return config;
  },

  // Security and cache headers
  async headers() {
    const csp =
      process.env.NODE_ENV === "production"
        ? // Avoid `unsafe-eval` in production (reduces XSS impact and enables stronger CSP)
          "default-src 'self'; script-src 'self' 'unsafe-inline'; script-src-elem 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; font-src 'self' data:; img-src 'self' data: blob: https:; connect-src 'self' https://*.dk0.dev; frame-ancestors 'none'; base-uri 'self'; form-action 'self'; worker-src 'self' blob:;"
        : // Dev CSP: allow eval for tooling compatibility, and localhost for HMR/API
          "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; script-src-elem 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; font-src 'self' data:; img-src 'self' data: blob: https: http://localhost:3000; connect-src 'self' http://localhost:3000 ws://localhost:3000 https://*.dk0.dev; frame-ancestors 'none'; base-uri 'self'; form-action 'self'; worker-src 'self' blob:;";

    return [
      {
        source: "/(.*)",
        headers: [
          {
            key: "X-DNS-Prefetch-Control",
            value: "on",
          },
          {
            key: "Strict-Transport-Security",
            value: "max-age=63072000; includeSubDomains; preload",
          },
          {
            key: "X-Frame-Options",
            value: "DENY",
          },
          {
            key: "X-Content-Type-Options",
            value: "nosniff",
          },
          {
            key: "X-XSS-Protection",
            value: "1; mode=block",
          },
          {
            key: "Referrer-Policy",
            value: "strict-origin-when-cross-origin",
          },
          {
            key: "Permissions-Policy",
            value: "camera=(), microphone=(), geolocation=()",
          },
          {
            key: "Content-Security-Policy",
            value: csp,
          },
        ],
      },
      {
        // Allow bfcache for n8n routes: use no-cache (revalidate) instead of no-store
        source: "/api/n8n/(.*)",
        headers: [
          {
            key: "Cache-Control",
            value: "no-cache, must-revalidate",
          },
        ],
      },
      {
        source: "/api/auth/(.*)",
        headers: [
          {
            key: "Cache-Control",
            value: "no-store, no-cache, must-revalidate, proxy-revalidate",
          },
        ],
      },
      {
        source: "/api/email/(.*)",
        headers: [
          {
            key: "Cache-Control",
            value: "no-store, no-cache, must-revalidate, proxy-revalidate",
          },
        ],
      },
      {
        source: "/api/contacts/(.*)",
        headers: [
          {
            key: "Cache-Control",
            value: "no-store, no-cache, must-revalidate, proxy-revalidate",
          },
        ],
      },
      {
        source: "/_next/static/(.*)",
        headers: [
          {
            key: "Cache-Control",
            // In dev, aggressive caching breaks HMR and can brick a tab with stale chunks.
            value:
              process.env.NODE_ENV === "production"
                ? "public, max-age=31536000, immutable"
                : "no-store",
          },
        ],
      },
    ];
  },
};

const withBundleAnalyzer = bundleAnalyzer({
  enabled: process.env.ANALYZE === "true",
});

const withNextIntl = createNextIntlPlugin("./i18n/request.ts");

export default withBundleAnalyzer(withNextIntl(nextConfig));