Some progress on Chakart

[xogo.git] / variants / Giveaway / class.js

import ChessRules from "/base_rules.js";
import { ArrayFun } from "/utils/array.js";
import { Random } from "/utils/alea.js";

export default class GiveawayRules extends ChessRules {

  static get Options() {
    return {
      select: [
        {
          label: "Mode",
          variable: "mode",
          defaut: "suicide",
          options: [
            {label: "Suicide", value: "suicide"},
            {label: "Losers", value: "losers"}
          ]
        }
      ].concat(C.Options.select),
      input: C.Options.input.filter(i => i.variable == "pawnfall"),
      styles: [
        "atomic", "cannibal", "cylinder", "dark",
        "madrasi", "rifle", "teleport", "zen"
      ]
    };
  }

  get hasFlags() {
    return this.options["mode"] == "losers";
  }

  get pawnPromotions() {
    let res = ['q', 'r', 'n', 'b'];
    if (this.options["mode"] == "suicide")
      res.push('k');
    return res;
  }

  genRandInitFen(seed) {
    if (this.options["randomness"] == 0) {
      return (
        'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 {"enpassant":"-"}'
      );
    }

    Random.setSeed(seed);
    let pieces = { w: new Array(8), b: new Array(8) };
    for (let c of ["w", "b"]) {
      if (c == 'b' && this.options["randomness"] == 1) {
        pieces['b'] = pieces['w'];
        break;
      }

      // Get random squares for every piece, totally freely
      let positions = Random.shuffle(ArrayFun.range(8));
      const composition = ['b', 'b', 'r', 'r', 'n', 'n', 'k', 'q'];
      const rem2 = positions[0] % 2;
      if (rem2 == positions[1] % 2) {
        // Fix bishops (on different colors)
        for (let i=2; i<8; i++) {
          if (positions[i] % 2 != rem2) {
            [positions[1], positions[i]] = [positions[i], positions[1]];
            break;
          }
        }
      }
      for (let i = 0; i < 8; i++)
        pieces[c][positions[i]] = composition[i];
    }
    return (
      pieces["b"].join("") +
      "/pppppppp/8/8/8/8/PPPPPPPP/" +
      pieces["w"].join("").toUpperCase() +
      // En-passant allowed, but no flags
      ' w 0 {"enpassant":"-"}'
    );
  }

  constructor(o) {
    o.options["capture"] = true;
    super(o);
  }

  underCheck([x, y], oppCol) {
    if (this.options["mode"] == "suicide")
      return false;
    return super.underCheck([x, y], oppCol);
  }

  getCurrentScore() {
    if (this.atLeastOneMove()) return "*";
    // No valid move: the side who cannot move wins
    return (this.turn == "w" ? "1-0" : "0-1");
  }

};