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

with lib;

let

  cfg = config.services.getmail;

  accounts =
    filter (a: a.getmail.enable) (attrValues config.accounts.email.accounts);

  # Note: The getmail service does not expect a path, but just the filename!
  renderConfigFilepath = a:
    if a.primary then "getmailrc" else "getmail${a.name}";
  configFiles =
    concatMapStringsSep " " (a: " --rcfile ${renderConfigFilepath a}") accounts;
in {
  options = {
    services.getmail = {
      enable = mkEnableOption
        "the getmail systemd service to automatically retrieve mail";

      frequency = mkOption {
        type = types.str;
        default = "*:0/5";
        example = "hourly";
        description = ''
          The refresh frequency. Check <literal>man systemd.time</literal> for
          more information on the syntax. If you use a gpg-agent in
          combination with the passwordCommand, keep the poll
          frequency below the cache-ttl value (as set by the
          <literal>default</literal>) to avoid pinentry asking
          permanently for a password.
        '';
      };
    };
  };

  config = mkIf cfg.enable {
    systemd.user.services.getmail = {
      Unit = { Description = "getmail email fetcher"; };
      Service = { ExecStart = "${pkgs.getmail}/bin/getmail ${configFiles}"; };
    };

    systemd.user.timers.getmail = {
      Unit = { Description = "getmail email fetcher"; };
      Timer = {
        OnCalendar = "${cfg.frequency}";
        Unit = "getmail.service";
      };
      Install = { WantedBy = [ "timers.target" ]; };
    };

  };
}