# ============================================================================
# Common Host Module
# ============================================================================
# This module contains all the common configuration shared by all host types.
# It is automatically imported by the fleet generator for every host.

{
  config,
  lib,
  inputs,
  ...
}:
let
  # Import all hardware modules so they're available for enabling
  hwTypes = import ../hw { inherit inputs; };
  hwModules = lib.attrValues hwTypes;

  # User account submodule definition
  userSubmodule = lib.types.submodule {
    options = {
      enable = lib.mkOption {
        type = lib.types.bool;
        default = false;
        description = "Whether this user account is enabled on this system.";
      };
      isNormalUser = lib.mkOption {
        type = lib.types.bool;
        default = true;
        description = "Whether this is a normal user account (vs system user).";
      };
      description = lib.mkOption {
        type = lib.types.nullOr lib.types.str;
        default = null;
        description = "Full name or description of the user (GECOS field).";
        example = "John Doe";
      };
      extraGroups = lib.mkOption {
        type = lib.types.listOf lib.types.str;
        default = [ ];
        description = "Additional groups for the user (wheel, docker, etc.).";
      };
      hashedPassword = lib.mkOption {
        type = lib.types.str;
        default = "!";
        description = "Hashed password for the user account. Default '!' means locked.";
      };
      extraPackages = lib.mkOption {
        type = lib.types.listOf lib.types.package;
        default = [ ];
        description = "Additional system packages available to this user.";
      };
      excludePackages = lib.mkOption {
        type = lib.types.listOf lib.types.package;
        default = [ ];
        description = "System packages to exclude for this user.";
      };
      homePackages = lib.mkOption {
        type = lib.types.listOf lib.types.package;
        default = [ ];
        description = "Packages to install in the user's home-manager profile.";
      };
      extraImports = lib.mkOption {
        type = lib.types.listOf lib.types.path;
        default = [ ];
        description = "Additional home-manager modules to import for this user.";
      };
      external = lib.mkOption {
        type = lib.types.nullOr (
          lib.types.oneOf [
            lib.types.path
            (lib.types.submodule {
              options = {
                url = lib.mkOption {
                  type = lib.types.str;
                  description = "Git repository URL to fetch user configuration from.";
                };
                rev = lib.mkOption {
                  type = lib.types.str;
                  description = "Git commit hash, tag, or branch to fetch.";
                };
                submodules = lib.mkOption {
                  type = lib.types.bool;
                  default = false;
                  description = "Whether to fetch Git submodules.";
                };
              };
            })
          ]
        );
        default = null;
        description = "External dotfiles repository (user.nix + optional nixos.nix).";
      };
      opensshKeys = lib.mkOption {
        type = lib.types.listOf lib.types.str;
        default = [ ];
        description = "SSH public keys for the user (authorized_keys).";
      };
      shell = lib.mkOption {
        type = lib.types.nullOr (
          lib.types.enum [
            "bash"
            "zsh"
            "fish"
            "tcsh"
          ]
        );
        default = "bash";
        description = "Default shell for the user.";
      };
      editor = lib.mkOption {
        type = lib.types.nullOr (
          lib.types.enum [
            "vim"
            "neovim"
            "emacs"
            "nano"
            "code"
          ]
        );
        default = "neovim";
        description = "Default text editor for the user (sets EDITOR).";
      };
      useZshTheme = lib.mkOption {
        type = lib.types.bool;
        default = true;
        description = "Whether to apply the system Zsh theme (Oh My Posh).";
      };
      useNvimPlugins = lib.mkOption {
        type = lib.types.bool;
        default = true;
        description = "Whether to apply the system Neovim configuration.";
      };
    };
  };
in
{
  imports = [
    ./fs.nix
    ./boot.nix
    ./user-config.nix
    ../sw
    inputs.vscode-server.nixosModules.default
    inputs.nixos-wsl.nixosModules.default
  ]
  ++ hwModules;

  options.athenix.users = lib.mkOption {
    type = lib.types.attrsOf userSubmodule;
    default = { };
    description = "User accounts configuration. Set enable=true for users that should exist on this system.";
  };

  options.athenix = {
    forUser = lib.mkOption {
      type = lib.types.nullOr lib.types.str;
      default = null;
      description = ''
        Convenience option to configure a host for a specific user.

        When set, automatically:
        - Enables the user account (athenix.users.<username>.enable = true)
        - Sets as default WSL user (on WSL systems)

        The username must exist in athenix.users (defined in users.nix).
      '';
      example = "engr-ugaif";
    };
    host.useHostPrefix = lib.mkOption {
      type = lib.types.bool;
      default = true;
      description = ''
        Whether to prepend the hardware type prefix to the hostname.

        When true:
        - "nix-laptop" with device "1" → hostname "nix-laptop1"
        - "nix-wsl" with device "alice" → hostname "nix-wsl-alice"

        When false:
        - Device name becomes the full hostname (useful for custom names)
      '';
    };
  };

  config = lib.mkMerge [
    (lib.mkIf (config.athenix.forUser != null) {
      athenix.users.${config.athenix.forUser}.enable = true;
    })
    {
      system.stateVersion = "25.11";
      nix.settings.experimental-features = [
        "nix-command"
        "flakes"
      ];
    }
  ];
}