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

with lib;

let

  cfg = config.services.flameshot;

  iniFormat = pkgs.formats.ini { };

  iniFile = iniFormat.generate "flameshot.ini" cfg.settings;

in {
  meta.maintainers = [ maintainers.hamhut1066 ];

  options.services.flameshot = {
    enable = mkEnableOption "Flameshot";

    package = mkOption {
      type = types.package;
      default = pkgs.flameshot;
      defaultText = literalExpression "pkgs.flameshot";
      description = "Package providing <command>flameshot</command>.";
    };

    settings = mkOption {
      type = iniFormat.type;
      default = { };
      example = {
        General = {
          disabledTrayIcon = true;
          showStartupLaunchMessage = false;
        };
      };
      description = ''
        Configuration to use for Flameshot. See
        <link xlink:href="https://github.com/flameshot-org/flameshot/blob/master/flameshot.example.ini"/>
        for available options.
      '';
    };
  };

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

    home.packages = [ cfg.package ];

    xdg.configFile = mkIf (cfg.settings != { }) {
      "flameshot/flameshot.ini".source = iniFile;
    };

    systemd.user.services.flameshot = {
      Unit = {
        Description = "Flameshot screenshot tool";
        Requires = [ "tray.target" ];
        After = [ "graphical-session-pre.target" "tray.target" ];
        PartOf = [ "graphical-session.target" ];
        X-Restart-Triggers = mkIf (cfg.settings != { }) [ "${iniFile}" ];
      };

      Install = { WantedBy = [ "graphical-session.target" ]; };

      Service = {
        Environment = "PATH=${config.home.profileDirectory}/bin";
        ExecStart = "${cfg.package}/bin/flameshot";
        Restart = "on-abort";

        # Sandboxing.
        LockPersonality = true;
        MemoryDenyWriteExecute = true;
        NoNewPrivileges = true;
        PrivateUsers = true;
        RestrictNamespaces = true;
        SystemCallArchitectures = "native";
        SystemCallFilter = "@system-service";
      };
    };
  };
}