/vqdr/trunk

/* dice.vala

 *

 * Copyright 2021 Gustav Hartvigsson <unknown@domain.org>

 *

 * This file is free software; you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License as

 * published by the Free Software Foundation; either version 3 of the

 * License, or (at your option) any later version.

 *

 * This file is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 * SPDX-License-Identifier: LGPL-3.0-or-later

 */

using GLib;

/**

 * A Simple Represetation of a dice.

 */

public class VQDR.Expression.Dice {

  public uint32 times { get; set; }

  public uint32 faces { get; set; }

  public int32 modifier { get; set; }

  public Dice (uint32 times = 1, uint32 faces = 6, int32 modifier = 0) {

    this.times = times;

    this.faces = faces;

    this.modifier = modifier;

  }

  public Dice.single (int32 faces) {

    this.times = 1;

    this.faces = faces;

    this.modifier = 0;

  }

  public uint32 roll () {

    if (faces <= 0) {

      return modifier;

    }

    if (times <= 0) {

        return modifier;

    }

    if (faces == 1) {

      return times + modifier;

    }

    uint32 retval = modifier;

    for (size_t i = 1; i <= times; i++) {

      uint32 r = Vee.Random.get_static_int () % faces;

      retval += r;

    }

    return retval;

  }

  public string to_string () {

    if ((times == 0) && (faces == 0)) {

      return "0";

    }

    StringBuilder retval = new StringBuilder ();

    if (times > 0) {

      retval.append (times.to_string ())

            .append_c ('d')

            .append (faces.to_string ());

    }

    if (modifier > 0) {

        retval.append_c ('+').append (modifier.to_string ());

    } else if (modifier < 0) {

        retval.append (modifier.to_string ());

    }

    return retval.str;

  }

}