# flake.nix
{
  description = "A portable development environment for atridotdad with Nix Flakes";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; # Pin to a specific branch or commit for stability
    flake-utils.url = "github:numtide/flake-utils"; # Helps with system boilerplate
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};

        isDarwin = pkgs.stdenv.isDarwin;
        isLinux = pkgs.stdenv.isLinux;

        commonDevTools = with pkgs; [
          nodejs_24
          nodePackages.pnpm
          git
          curl
        ];

        # Common libraries needed for Playwright across platforms (e.g., for WebKit/Firefox)
        playwrightCommonLibs = with pkgs; [
          glib
          nss
          nspr
          dbus
          atk
          at-spi2-atk
          at-spi2-core
          cups
          expat
          libxkbcommon
          cairo
          pango
          fontconfig
          freetype
          harfbuzz
          icu
          libpng
          gnutls
        ];

        # Linux-specific libraries for Playwright (mostly Chromium dependencies)
        playwrightLinuxSpecificLibs = with pkgs; [
          glibc
          libgcc
          xorg.libX11
          xorg.libxcb
          xorg.libXext
          xorg.libXfixes
          xorg.libXrandr
          xorg.libXcomposite
          xorg.libXdamage
          xorg.libXcursor
          xorg.libXi
          xorg.libXrender
          xorg.libXtst
          mesa
          libglvnd
          libdrm
          udev
          alsa-lib
        ];

        playwrightSelfDownloadLibs = playwrightCommonLibs ++ (if isLinux then playwrightLinuxSpecificLibs else []);

        playwrightLibPath = pkgs.lib.makeBinPath playwrightSelfDownloadLibs;

      in
      {
        devShells.default = pkgs.mkShell {
          packages = commonDevTools ++ (
            if isDarwin
            then playwrightCommonLibs # For macOS, Playwright will download Chromium. Provide base libs.
            else [ pkgs.chromium ] ++ playwrightSelfDownloadLibs # For Linux, provide Chromium and its dependencies
          );

          PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD = if isDarwin then "0" else "1";

          PLAYWRIGHT_CHROMIUM_EXECUTABLE_PATH = pkgs.lib.optionalString isLinux "${pkgs.chromium}/bin/chromium";
          PUPPETEER_SKIP_CHROMIUM_DOWNLOAD = if isDarwin then "false" else "true";
          PUPPETEER_EXECUTABLE_PATH = pkgs.lib.optionalString isLinux "${pkgs.chromium}/bin/chromium";

          shellHook = ''
            echo "🚀 atridotdad development environment loaded!"
            echo "Node version: $(node --version)"
            echo "pnpm version: $(pnpm --version)"

            ${pkgs.lib.optionalString isDarwin ''
              echo "Chromium path: Playwright will download its own for macOS"

              export LD_LIBRARY_PATH="${playwrightLibPath}:$LD_LIBRARY_PATH"

              PLAYWRIGHT_BROWSERS_PATH="''${TMPDIR:-$HOME/.cache}/ms-playwright"
              export PLAYWRIGHT_BROWSERS_PATH

              if [ ! -d "$PLAYWRIGHT_BROWSERS_PATH" ] || [ -z "$(ls -A "$PLAYWRIGHT_BROWSERS_PATH")" ]; then
                echo "🌐 Installing Playwright browsers (for macOS)..."
                pnpm exec playwright install chromium
              else
                echo "✅ Playwright browsers already installed (for macOS)."
              fi
            ''}

            ${pkgs.lib.optionalString isLinux ''
              echo "Chromium path: ${pkgs.chromium}/bin/chromium"
            ''}

            if [ ! -d "node_modules" ]; then
              echo "📦 Installing pnpm dependencies..."
              pnpm install --frozen-lockfile # Use --frozen-lockfile for more consistent builds
            fi
          '';
        };
      });
}