{ lib, pkgs, config, ... }:

let
  username    = config.users.users.defaultUser or "henrov";
  homeDir     = "/home/${username}";
  programName = "zsh";
  programAssets = ../../../assets/system/conf/${programName};
  zshInitFile  = "${programAssets}/zsh.conf";

  # Helper to fetch an external plugin from GitHub
  fetchPlugin = { owner, repo, rev, sha256 }: pkgs.fetchFromGitHub {
    inherit owner repo rev sha256;
  };
in
{
  # Ensure zsh is installed system-wide
  environment.systemPackages = [ pkgs.zsh ];

  # Home Manager configuration for the default user
  home.username = username;
  home.homeDirectory = homeDir;

  programs.zsh = {
    enable = true;

    ohMyZsh = {
      enable = true;
      theme = "catppuccin-mocha";

      # Standard built-in plugins
      plugins = [
        "git"
        "docker"
        "direnv"
        "zsh-autosuggestions"
        "zsh-completions"
        "zsh-history-substring-search"
      ];

      # Inject custom Zsh configuration
      shellInit = builtins.readFile zshInitFile;
    };
  };
}