feat: add extensible item inventory and world system

2026-08-23 23:16:49 +02:00
parent 25e32f20d9
commit f4331f426c
48 changed files with 693 additions and 0 deletions
@@ -0,0 +1,83 @@
+using System;
+using Game.Features.Items.Contracts;
+
+namespace Game.Features.Items.Domain;
+
+public sealed class HandsInventory
+{
+    private ItemInstanceId? _leftHand;
+    private ItemInstanceId? _rightHand;
+
+    public bool IsFree(Hand hand) => Get(hand) is null;
+
+    public ItemInstanceId? Get(Hand hand) => hand switch
+    {
+        Hand.Left => _leftHand,
+        Hand.Right => _rightHand,
+        _ => throw new ArgumentOutOfRangeException(nameof(hand), hand, null)
+    };
+
+    public bool TryHold(ItemInstanceId itemId, HandRequirement requirement, Hand hand)
+    {
+        if (_leftHand == itemId || _rightHand == itemId)
+        {
+            return false;
+        }
+
+        if (requirement == HandRequirement.Both)
+        {
+            if (_leftHand is not null || _rightHand is not null)
+            {
+                return false;
+            }
+
+            _leftHand = itemId;
+            _rightHand = itemId;
+            return true;
+        }
+
+        if (!IsFree(hand))
+        {
+            return false;
+        }
+
+        Set(hand, itemId);
+        return true;
+    }
+
+    public ItemInstanceId? Release(Hand hand)
+    {
+        ItemInstanceId? itemId = Get(hand);
+        if (itemId is null)
+        {
+            return null;
+        }
+
+        if (_leftHand == itemId)
+        {
+            _leftHand = null;
+        }
+
+        if (_rightHand == itemId)
+        {
+            _rightHand = null;
+        }
+
+        return itemId;
+    }
+
+    private void Set(Hand hand, ItemInstanceId itemId)
+    {
+        switch (hand)
+        {
+            case Hand.Left:
+                _leftHand = itemId;
+                break;
+            case Hand.Right:
+                _rightHand = itemId;
+                break;
+            default:
+                throw new ArgumentOutOfRangeException(nameof(hand), hand, null);
+        }
+    }
+}