{ lib, config, ... }:

let
  # --- Module variables ---
  moduleName = "hyprland";
  username   = config.defaultUser or "henrov";

  # Assets directory
  assetPath = ../../../assets/hyprland/conf/hypr;

  # Read all files except main config
  allFiles =
    if builtins.pathExists assetPath
    then builtins.readDir assetPath
    else {};

  otherFiles = lib.filter (name: name != "hyprland.conf") (builtins.attrNames allFiles);

  files = lib.genAttrs otherFiles (name: {
    src = "${assetPath}/${name}";
  });

  # Main config (inline)
  mainConfigPath =
    if builtins.pathExists "${assetPath}/hyprland.conf"
    then "${assetPath}/hyprland.conf"
    else null;

  # Top-level toggle
  enableProgram = config.enableHyprland or false;
in
{
  # --- Option ---
  options.enableHyprland = lib.mkEnableOption "Enable Hyprland desktop";

  # --- Config ---
  config = lib.mkIf enableProgram {

    # --- Dendritic app definition ---
    myApps.${moduleName} = {
      enable    = true;
      assetsDir = assetPath;
      files     = files;
      user      = username;
      compositor = "hyprland";
    };

    # Enable Hyprland programmatically
    programs.hyprland.enable = true;

    # --- Home Manager wiring ---
    home-manager.users.${username} = {
      home.stateVersion  = "26.05";
      home.username      = username;
      home.homeDirectory = "/home/${username}";

      wayland.windowManager.hyprland = {
        enable = true;
        settings.general."col.active_border" =
          lib.mkForce "0xff97cbcd 0xff89b4fa";
      };

      # Deploy config files
      xdg.configFile =
        (lib.mapAttrs' (name: value: {
          name  = "hypr/${name}";
          value.source = value.src;
        }) files)
        // (if mainConfigPath != null then {
             "hypr/hyprland.conf".text = builtins.readFile mainConfigPath;
           } else {})
        // {
             "hypr/.keep".text = "";
           };
    };

    # --- Optional: systemd service to sync configs ---
    systemd.services."${moduleName}-sync" = {
      description = "Sync ${moduleName} configuration files";
      wantedBy    = [ "multi-user.target" ];
      wants       = [ "network-online.target" ];
      after       = [ "network-online.target" ];

      serviceConfig = {
        Type = "oneshot";
        ExecStart = ''
          set -euo pipefail
          if [ -d "${assetPath}" ]; then
            for f in ${lib.concatStringsSep " " (builtins.attrNames files)}; do
              cp -u "${assetPath}/$f" "/home/${username}/.config/${moduleName}/$f"
            done
          fi
          if [ -f "${mainConfigPath}" ]; then
            cp -u "${mainConfigPath}" "/home/${username}/.config/${moduleName}/hyprland.conf"
          fi
        '';
      };

      restartTriggers = [ assetPath ];
      path = [];
    };
  };
}