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

let
  cfg = config.services.wallpaperRotator;
in
{
  options.services.wallpaperRotator = {
    enable = lib.mkEnableOption "wallpaper rotation service using wpaperd";

    user = lib.mkOption {
      type = lib.types.str;
      description = "Username for the wallpaper service";
    };

    wallpaperPath = lib.mkOption {
      type = lib.types.str;
      default = "/home/${cfg.user}/nixos/shared/modules/services/wallpapers";
      description = "Path to the wallpaper directory";
    };

    duration = lib.mkOption {
      type = lib.types.str;
      default = "5m";
      example = "30s";
      description = "How long to display each wallpaper (e.g., 30s, 5m, 1h)";
    };

    sorting = lib.mkOption {
      type = lib.types.enum [ "random" "ascending" "descending" ];
      default = "random";
      description = "Order in which to display wallpapers";
    };

    mode = lib.mkOption {
      type = lib.types.enum [ "center" "fit" "fit-border-color" "stretch" "tile" ];
      default = "center";
      description = "How to display wallpapers when size differs from display resolution";
    };

    transition = {
      effect = lib.mkOption {
        type = lib.types.str;
        default = "fade";
        example = "hexagonalize";
        description = ''
          Transition effect name. Available effects include:
          fade, hexagonalize, simple-zoom, swirl, circle, wipe, slide, etc.
          See wpaperd documentation for full list.
        '';
      };

      duration = lib.mkOption {
        type = lib.types.int;
        default = 300;
        example = 2000;
        description = "Transition duration in milliseconds";
      };
    };

    queueSize = lib.mkOption {
      type = lib.types.int;
      default = 10;
      description = "Size of wallpaper history queue for random mode";
    };

    initialTransition = lib.mkOption {
      type = lib.types.bool;
      default = true;
      description = "Enable transition effect at wpaperd startup";
    };
  };

  config = lib.mkIf cfg.enable {
    home-manager.users.${cfg.user} = {
      services.wpaperd = {
        enable = true;
        settings = {
          # Default configuration for all displays
          default = {
            path = cfg.wallpaperPath;
            duration = cfg.duration;
            sorting = cfg.sorting;
            mode = cfg.mode;
            transition-time = cfg.transition.duration;
            queue-size = cfg.queueSize;
            initial-transition = cfg.initialTransition;
          };

          # Apply transition effect
          "default.transition.${cfg.transition.effect}" = {};
        };
      };

      # Add wpaperd CLI tool to user packages for manual control
      home.packages = with pkgs; [
        wpaperd
      ];
    };
  };
}