From: Benjamin Auder <benjamin.auder@somewhere>
Date: Thu, 27 Jul 2023 17:35:22 +0000 (+0200)
Subject: Fix Copycat
X-Git-Url: https://git.auder.net/?p=xogo.git;a=commitdiff_plain;h=a46d74c085e79e62716e3fca8a10a22d2ca10056

Fix Copycat
---

diff --git a/base_rules.js b/base_rules.js
index 9cedfd0..c0d9b60 100644
--- a/base_rules.js
+++ b/base_rules.js
@@ -1838,8 +1838,6 @@ export default class ChessRules {
     }
   }
 
-  // TODO here: should/could use getPotentialMovesFrom ?! (not sure)
-  // --> would be useful for variants like Copycat.
   // Search for enemy (or not) pieces attacking [x, y]
   findCapturesOn([x, y], o, allowed) {
     if (!o.byCol)
diff --git a/variants/Copycat/class.js b/variants/Copycat/class.js
index 2c417c5..e19367c 100644
--- a/variants/Copycat/class.js
+++ b/variants/Copycat/class.js
@@ -6,16 +6,16 @@ export default class CopycatRules extends ChessRules {
     return {
       select: C.Options.select,
       input: C.Options.input,
-      styles: ["atomic", "capture", "crazyhouse", "cylinder", "dark", "zen"]
+      styles: C.Options.styles.filter(s => !["madrasi", "zen"].includes(s))
     };
   }
 
-  getPotentialMovesFrom([x, y], color) {
-    let moves = super.getPotentialMovesFrom([x, y], color);
-    // Expand potential moves if attacking friendly pieces.
+  getStepSpec(color, x, y) {
+    let res = super.getStepSpec(color, x, y);
     const piece = this.getPiece(x,y);
     if (['p', 'k'].includes(piece))
-      return moves;
+      return res;
+    // Now check if the piece at x, y attack some friendly one (enhancement)
     let movements = {};
     const steps = this.pieces()[piece].both[0].steps;
     steps.forEach(s => {
@@ -28,7 +28,7 @@ export default class CopycatRules extends ChessRules {
         i += s[0];
         j += s[1];
       }
-      if (this.onBoard(i, j) && this.getColor(i, j) == this.turn) {
+      if (this.onBoard(i, j) && this.getColor(i, j) == color) {
         const attacked = this.getPiece(i, j);
         if (['r', 'b', 'n'].includes(attacked)) {
           if (!movements[attacked])
@@ -43,21 +43,10 @@ export default class CopycatRules extends ChessRules {
       }
     });
     Object.keys(movements).forEach(type => {
-      if (
-        (piece != 'q' && type != piece) ||
-        (piece == 'q' && type == 'n')
-      ) {
-        Array.prototype.push.apply(moves,
-          super.getPotentialMovesOf(type, [x, y]));
-      }
+      if ((piece != 'q' && type != piece) || (piece == 'q' && type == 'n'))
+        res.both.push(this.pieces()[type].both[0]);
     });
-    return moves;
-  }
-
-  underAttack([x, y], oppCols) {
-    if (super.underAttack([x, y], oppCols)
-      return true;
-    //TODO
+    return res;
   }
 
 };