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# nixos-config - My current NixOS configuration
#
# Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
# SPDX-License-Identifier: GPL-3.0-or-later
#
# This file is part of my nixos-config.
#
# You should have received a copy of the License along with this program.
# If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
{
  lib,
  config,
  pkgs,
  ...
}: let
  cfg = config.soispha.programs.ly;

  # HACK: We search for the generate river desktop file, which should exist <2026-03-13>
  riverDesktop =
    lib.lists.findFirst
    (x: lib.strings.hasSuffix "river.desktop" x)
    null
    config.home-manager.users.soispha.home.packages;

  shellDesktop = pkgs.writeText "zsh.desktop" ''
    [Desktop Entry]
    Comment=A simple shell session
    DesktopNames=null
    Exec=zsh
    Name=zsh shell
    Terminal=true
  '';

  # TODO: This could use the `services.display-manager.sessionPackages` option <2026-06-23>
  customSessionsDir =
    pkgs.runCommand "custom-sessions" {}
    /*
    bash
    */
    ''
      mkdir "$out";
      cp "${riverDesktop}/share/applications/river.desktop" "$out"
      cp "${shellDesktop}" "$out/zsh.desktop"
    '';

  setup = pkgs.writeShellApplication {
    name = "setup";

    bashOptions = [];

    runtimeInputs = [
      pkgs.findutils
      pkgs.systemd
    ];
    inheritPath = true;

    text = builtins.readFile ./setup.sh;
  };
in {
  options.soispha.programs.ly = {
    enable = lib.mkEnableOption "ly";

    batteryName = lib.mkOption {
      type = lib.types.nullOr lib.types.str;
      example = "BAT0";
      default = null;
      description = "The name of the battery, if null, will not show a batter percentage.";
    };
  };

  config = lib.mkIf cfg.enable {
    assertions = [
      {
        assertion = riverDesktop != null;
        message = ''
          There seems to be no `river.desktop` file generated. You will not be able to
          log-into river without it.
        '';
      }
    ];

    home-manager.users.soispha = {
      home.sessionVariables = {
        XCOMPOSECACHE = "${config.home-manager.users.soispha.xdg.cacheHome}/X11/xcompose";
      };
    };

    services.displayManager.ly = {
      enable = true;
      x11Support = false;

      settings = {
        battery_id = cfg.batteryName;

        # Stop animations after 10 secs.
        animation_timeout_sec = 60;

        animation = "dur_file";
        dur_file_path = "${./blackhole-smooth-240x67.dur}";
        full_color = true;

        # NOTE: This does the same as the default nixos setup cmd, but we don't
        # immidiately start the `graphical-session.target`. That is started by river's
        # init. <2026-06-23>
        setup_cmd = "${lib.getExe setup}";

        custom_sessions = "${customSessionsDir}";

        # Clear the screen before starting up (otherwise error messages might linger on
        # it.)
        start_cmd = "clear";

        # Clear the password on failure.
        clear_password = true;

        session_log = "${config.home-manager.users.soispha.xdg.dataHome}/ly/ly-session.log";

        clock = "%c";

        hibernate_cmd = "systemctl hibernate";
        inactivity_cmd = "systemctl suspend-then-hibernate";
        restart_cmd = "reboot";
        shutdown_cmd = "shutdown $PLATFORM_SHUTDOWN_ARG now";
        sleep_cmd = "systemctl suspend";

        inactivity_delay = 120; # unit is seconds
      };
    };
  };
}