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{ config
, lib
, pkgs
, ...
}:
with lib;
let
  cfg = config.services.wpaperd;
  tomlFormat = pkgs.formats.toml { };
in
{
  options.services.wpaperd = {
    enable = mkEnableOption "enable wpaperd";

    package = mkOption {
      default = pkgs.wpaperd;
      defaultText = literalExpression "pkgs.wpaperd";
      type = types.package;
      example = literalExpression "pkgs.wpaperd";
      description = "The package to use for the wpaperd binary.";
    };

    settings = mkOption {
      type = tomlFormat.type;
      description = ''
        Configuration for wpaperd. Options are specified on:
        https://github.com/danyspin97/wpaperd#wallpaper-configuration
      '';
      example = literalExpression ''
        {
          default = {
            path = "/home/myusername/Pictures/Wallpapers/";
            duration = "10m"
            sorting = "random";
          };
        }
      '';
    };

    systemdTarget = mkOption {
      type = types.str;
      default = "hyprland-session.target";
      description = ''
        Systemd target to bind to.
        Note: if you're using home-manager to configure hyprland, you want to
        have `wayland.windowManager.hyprland.systemdIntegration` enabled.
      '';
    };
  };

  config = mkIf cfg.enable {
    assertions = [ (hm.assertions.assertPlatform "services.wpaperd" pkgs platforms.linux) ];

    home.packages = [ cfg.package ];

    xdg.configFile = {
      "wpaperd/wallpaper.toml" = mkIf (cfg.settings != { }) {
        source = tomlFormat.generate "wpaperd-config" cfg.settings;
      };
    };

    systemd.user.services.wpaperd = {
      Unit = {
        Description = "Wallpaper daemon for Wayland";
        BindsTo = [ cfg.systemdTarget ];
      };

      Service = {
        Type = "simple";
        ExecStart = "${cfg.package}/bin/wpaperd";
      };

      Install.WantedBy = [ cfg.systemdTarget ];
    };
  };
}