fun: pick it up and put it in!

common/traits/receptacle.trait.js

@@ -119,6 +119,15 @@ export class Receptacle extends decorate(Trait) {
     item.on('qtyChanged', listener);
   }
 
+  firstFreeSlotIndex() {
+    for (let i = 0; i < this.entity.slotCount; ++i) {
+      if (!this.slotItems[i]) {
+        return i;
+      }
+    }
+    return -1;
+  }
+
   isSlotIndexInRange(slotIndex) {
     return slotIndex >= 0 && slotIndex < this.entity.slotCount;
   }
@@ -132,8 +141,19 @@ export class Receptacle extends decorate(Trait) {
     return -1;
   }
 
-  // TODO
   mergeItem(item) {
+    const slotIndex = this.queryItem(item);
+    if (-1 === slotIndex) {
+      const freeSlotIndex = this.firstFreeSlotIndex();
+      if (-1 !== freeSlotIndex) {
+        this.entity.addItemToSlot(item, freeSlotIndex);
+      }
+    }
+    else {
+      const slotItem = this.entity.itemInSlot(slotIndex);
+      slotItem.decrementQuantity(-item.qty);
+      item.destroy();
+    }
   }
 
   packets(informed) {
@@ -142,6 +162,22 @@ export class Receptacle extends decorate(Trait) {
     }
   }
 
+  queryItem(item) {
+    for (let i = 0; i < this.entity.slotCount; ++i) {
+      // Anything?
+      if (!this.slotItems[i]) {
+        continue;
+      }
+      // URI?
+      if (item.uri !== this.slotItems[i].uri) {
+        continue;
+      }
+      // TODO: Qty, Specifics?
+      return i;
+    }
+    return -1;
+  }
+
   removeListenersForItem(item) {
     item.off('qtyChanged', this.qtyListeners.get(item));
     this.qtyListeners.delete(item);
@@ -155,6 +191,18 @@ export class Receptacle extends decorate(Trait) {
     return json;
   }
 
+  listeners() {
+    const listeners = {};
+    if (AVOCADO_SERVER) {
+      listeners.collisionStart = (other) => {
+        if (other.is('item')) {
+          this.entity.addItemToSlot(other);
+        }
+      };
+    }
+    return listeners;
+  }
+
   methods() {
     return {