Add Giveaway. Preparing for Chakart a little more

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

diff --git a/variants/Giveaway/class.js b/variants/Giveaway/class.js
new file mode 100644 (file)
index 0000000..77f5c74
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+++ b/variants/Giveaway/class.js
@@ -0,0 +1,96 @@
+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");
+  }
+
+};