From dbed4468c50b188a6845287e8ffb5154de02843a Mon Sep 17 00:00:00 2001
From: marti <marti.vich@gmail.com>
Date: Sat, 3 Jan 2026 00:00:36 +0100
Subject: [PATCH] Fix tile alignment: Enforce strict connection for multi-cell
 doors and fix exit reference logic

---
 src/engine/dungeon/DungeonGenerator.js | 47 +++++++++++++++++++++++---
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/src/engine/dungeon/DungeonGenerator.js b/src/engine/dungeon/DungeonGenerator.js
index 756c142..9e77c4a 100644
--- a/src/engine/dungeon/DungeonGenerator.js
+++ b/src/engine/dungeon/DungeonGenerator.js
@@ -65,17 +65,17 @@ export class DungeonGenerator {
             return false;
         }
 
-        // Validate exit exists
-        const exitExists = this.availableExits.some(
+        // Find the full exit object from availableExits (so we have tileId, etc.)
+        const foundExit = this.availableExits.find(
             e => e.x === exitPoint.x && e.y === exitPoint.y && e.direction === exitPoint.direction
         );
 
-        if (!exitExists) {
+        if (!foundExit) {
             console.warn("Invalid exit selected");
             return false;
         }
 
-        this.selectedExit = exitPoint;
+        this.selectedExit = foundExit;
 
         // Draw next card
         this.currentCard = this.deck.draw();
@@ -150,7 +150,44 @@ export class DungeonGenerator {
         if (!this.currentCard || this.state !== PLACEMENT_STATE.PLACING_TILE) return false;
 
         const variant = this.currentCard.variants[this.placementRotation];
-        return this.grid.canPlace(variant, this.placementX, this.placementY);
+
+        // 1. Basic Grid Collision
+        if (!this.grid.canPlace(variant, this.placementX, this.placementY)) {
+            return false;
+        }
+
+        // 2. Strict Door Alignment Check
+        if (this.selectedExit) {
+            // Identify the full "door" group (e.g., the pair of cells forming the exit)
+            // We look for other available exits on the same tile, facing the same way, and adjacent.
+            const sourceExits = this.availableExits.filter(e =>
+                e.tileId === this.selectedExit.tileId &&
+                e.direction === this.selectedExit.direction &&
+                (Math.abs(e.x - this.selectedExit.x) + Math.abs(e.y - this.selectedExit.y)) <= 1
+            );
+
+            // For every cell in the source door, the new tile MUST have a connecting exit
+            for (const source of sourceExits) {
+                // The coordinate where the new tile's exit should be
+                const targetPos = this.neighbor(source.x, source.y, source.direction);
+                const requiredDirection = this.opposite(source.direction);
+
+                // Does the new tile provide an exit here?
+                const hasMatch = variant.exits.some(localExit => {
+                    const gx = this.placementX + localExit.x;
+                    const gy = this.placementY + localExit.y;
+                    return gx === targetPos.x &&
+                        gy === targetPos.y &&
+                        localExit.direction === requiredDirection;
+                });
+
+                if (!hasMatch) {
+                    return false; // Misalignment: New tile doesn't connect to all parts of the door
+                }
+            }
+        }
+
+        return true;
     }
 
     cancelPlacement() {