// undo.js
// OK 09 2023
(function () {
  /*global adventurejs A*/

  /**
   * @augments {adventurejs.Verb}
   * @class undo
   * @ajsnode game.dictionary.verbs.undo
   * @ajsconstruct MyGame.createVerb({ "name": "undo", [...] });
   * @ajsconstructedby adventurejs.Dictionary#createVerb
   * @hideconstructor
   * @ajsinstanceof Verb
   * @ajsnavheading UtilityVerbs
   * @summary Verb meaning undo the last turn.
   * @tutorial Scripting_VerbSubscriptions
   * @tutorial Verbs_VerbAnatomy
   * @tutorial Verbs_VerbProcess
   * @tutorial Verbs_ModifyVerbs
   * @tutorial Verbs_WriteVerbs
   * @classdesc
   * <pre class="display border outline">
   * <span class="input">&gt; rochambeau troll</span>
   * The bridge troll shows genuine shock at your ungentlemanly
   * comportment. Unfortunately the bridge troll is also wearing a
   * stone codpiece, such that you do more damage to your foot
   * than to his unmentionables. The troll considers you as you hop
   * about on one foot, and after a brief hesitation decides
   * to teach you an unforgettable lesson in the trollish art of war.
   * <span class="input">&gt; undo</span>
   * Undoing one turn.
   * </pre>
   * <p>
   * <code>Undo</code> the player's last turn.
   * </p>
   */
  A.Preverbs.undo = {
    name: "undo",
    synonyms: ["undo"],
    msgNoObject: "msgNoObject - shouldn't be seeing this.",

    /**
     * @ajsverbstructures
     * @memberof undo
     */
    accepts_structures: ["verb"],

    do: function () {
      this.game.log("L1382", "log", "high", "undo", "verbs");
      var input = this.game.getInput();
      var verb_phrase = input.verb_phrase;
      var msg = "";

      if (0 < this.game.world_history.length) {
        let worldString = this.game.world_history[0];
        delete this.game.world_history[0];
        this.game.world_history.shift();

        let restored = A.restoreWorld.call(this.game, worldString);

        if (restored) {
          this.game.parser.input_history.shift();
          this.game.debug(`D1461 | ${this.name}.js | undo successful `);
          msg += "Undoing one turn. ";
          if (msg) this.game.print(msg, "");
          return true;
        } else {
          this.game.debug(`D1462 | ${this.name}.js | undo failed `);
          msg += `Undo failed! (You might say, "undo undone.") `;
          if (msg) this.game.print(msg, "");
          return false;
        }
      }

      this.game.debug(`D1463 | ${this.name}.js | undo default `);
      msg += "Nothing to undo. ";
      if (msg) this.game.print(msg, "");

      return true;
    },
  };
})();