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

with lib;

let cfg = config.services.podman;
in {
  options.services.podman = {
    autoUpdate = {
      enable = mkOption {
        type = types.bool;
        default = false;
        description = "Automatically update the podman images.";
      };

      onCalendar = mkOption {
        type = types.str;
        default = "Sun *-*-* 00:00";
        description = ''
          The systemd `OnCalendar` expression for the update. See
          {manpage}`systemd.time(7)` for a description of the format.
        '';
      };
    };
  };

  config = mkIf cfg.enable (mkMerge [
    (mkIf cfg.autoUpdate.enable {
      systemd.user.services."podman-auto-update" = {
        Unit = {
          Description = "Podman auto-update service";
          Documentation = "man:podman-auto-update(1)";
          Wants = [ "network-online.target" ];
          After = [ "network-online.target" ];
        };

        Service = {
          Type = "oneshot";
          Environment = "PATH=${
              builtins.concatStringsSep ":" [
                "/run/wrappers/bin"
                "/run/current-system/sw/bin"
                "${config.home.homeDirectory}/.nix-profile/bin"
              ]
            }";
          ExecStart = "${pkgs.podman}/bin/podman auto-update";
          ExecStartPost = "${pkgs.podman}/bin/podman image prune -f";
          TimeoutStartSec = "300s";
          TimeoutStopSec = "10s";
        };
      };

      systemd.user.timers."podman-auto-update" = {
        Unit = { Description = "Podman auto-update timer"; };

        Timer = {
          OnCalendar = cfg.autoUpdate.onCalendar;
          RandomizedDelaySec = 300;
          Persistent = true;
        };

        Install = { WantedBy = [ "timers.target" ]; };
      };
    })
  ]);
}