{
  config,
  lib,
  pkgs,
  ...
}: let
  inherit (lib) mkIf types;

  cfg = config.programs.worktrunk;
in {
  options.programs.worktrunk = {
    enable = lib.mkEnableOption "worktrunk, a CLI tool for managing work sessions";

    package = lib.mkPackageOption pkgs "worktrunk" {nullable = true;};

    enableBashIntegration = lib.hm.shell.mkBashIntegrationOption {inherit config;};

    enableFishIntegration = lib.hm.shell.mkFishIntegrationOption {inherit config;};

    enableNushellIntegration = lib.hm.shell.mkNushellIntegrationOption {inherit config;};

    enableZshIntegration = lib.hm.shell.mkZshIntegrationOption {inherit config;};

    shellWrapperName = lib.mkOption {
      type = types.str;
      default = "wt";
      example = "wt";
      description = ''
        Name of the shell wrapper to be called.
      '';
    };
  };

  config = mkIf cfg.enable {
    home.packages = mkIf (cfg.package != null) [cfg.package];

    programs = let
      bashIntegration = ''
        ${cfg.shellWrapperName}() {
            local directive_file=$(mktemp)
            WORKTRUNK_DIRECTIVE_FILE="$directive_file" command ${
          if cfg.shellWrapperName != "wt"
          then "wt"
          else "\${WORKTRUNK_BIN:-wt}"
        } "$@"
            if [[ -s "$directive_file" ]]; then
                source "$directive_file"
            fi
            rm -f "$directive_file"
        }
      '';

      fishIntegration = ''
        set -l directive_file (mktemp)
        ${
          if cfg.shellWrapperName != "wt"
          then ''
            env WORKTRUNK_DIRECTIVE_FILE=$directive_file wt $argv''
          else ''
            set -q WORKTRUNK_BIN; or set -l WORKTRUNK_BIN wt
            env WORKTRUNK_DIRECTIVE_FILE=$directive_file $WORKTRUNK_BIN $argv''
        }
        if test -s "$directive_file"
            set -l directive (string collect < "$directive_file")
            eval $directive
        end
        command rm -f "$directive_file"
      '';

      nushellIntegration = ''
        def --env --wrapped ${cfg.shellWrapperName} [...args] {
            let directive_file = (mktemp --tmpdir)
            let worktrunk_bin = (${
          if cfg.shellWrapperName != "wt"
          then "'wt'"
          else "$env.WORKTRUNK_BIN? | default 'wt'"
        })
            with-env { WORKTRUNK_DIRECTIVE_FILE: $directive_file } {
                ^$worktrunk_bin ...$args
            }
            if ($directive_file | path exists) {
                let directives = open $directive_file --raw | str trim | lines
                for directive in $directives {
                    if ($directive | str starts-with "cd '") {
                        let target_dir = $directive | str substring 4..-2
                        cd $target_dir
                    }
                }
            }
            rm -f $directive_file
        }
      '';
    in {
      bash.initExtra = mkIf cfg.enableBashIntegration bashIntegration;

      zsh.initContent = mkIf cfg.enableZshIntegration bashIntegration;

      fish.functions.${cfg.shellWrapperName} = mkIf cfg.enableFishIntegration fishIntegration;

      nushell.extraConfig = mkIf cfg.enableNushellIntegration nushellIntegration;
    };
  };
}