Task 2: Equipment System - support 2-handed weapons, staves block offhand slot

src/lib/game/crafting-slice.ts

@@ -1,8 +1,8 @@
 // ─── Crafting Store Slice ─────────────────────────────────────────────────────────
 // Handles equipment and enchantment system: design, prepare, apply stages
 
-import type { GameState, EquipmentInstance, AppliedEnchantment, EnchantmentDesign, DesignEffect, EquipmentSlot, EquipmentCraftingProgress, LootInventory, AttunementState } from './types';
-import { EQUIPMENT_TYPES, type EquipmentCategory } from './data/equipment';
+import type { GameState, EquipmentInstance, AppliedEnchantment, EnchantmentDesign, DesignEffect, EquipmentCraftingProgress, LootInventory, AttunementState } from './types';
+import { EQUIPMENT_TYPES, type EquipmentCategory, type EquipmentSlot } from './data/equipment';
 import { ENCHANTMENT_EFFECTS, calculateEffectCapacityCost } from './data/enchantment-effects';
 import { CRAFTING_RECIPES, canCraftRecipe, type CraftingRecipe } from './data/crafting-recipes';
 import { SPELLS_DEF } from './constants';
@@ -221,6 +221,34 @@ export function createCraftingSlice(
       const currentEquipped = state.equippedInstances[slot];
       if (currentEquipped === instanceId) return true; // Already equipped here
 
+      // 2-handed weapon checks
+      const isTwoHanded = type.twoHanded === true;
+
+      if (isTwoHanded) {
+        // Cannot equip 2-handed weapon if main hand or offhand is occupied
+        if (state.equippedInstances.mainHand || state.equippedInstances.offHand) {
+          return false;
+        }
+        // 2-handed weapons can only be equipped to main hand
+        if (slot !== 'mainHand') return false;
+      }
+
+      // If equipping to main hand, check if a 2-handed weapon is in main hand (block offhand)
+      if (slot === 'offHand' && state.equippedInstances.mainHand) {
+        const mainHandType = EQUIPMENT_TYPES[state.equippedInstances.mainHand];
+        if (mainHandType?.twoHanded) {
+          return false; // Cannot equip offhand when 2-handed weapon is equipped
+        }
+      }
+
+      // If equipping to offhand, check if a 2-handed weapon is in main hand
+      if (slot === 'offHand' && state.equippedInstances.mainHand) {
+        const mainHandType = EQUIPMENT_TYPES[state.equippedInstances.mainHand];
+        if (mainHandType?.twoHanded) {
+          return false; // Cannot equip offhand when 2-handed weapon is in main hand
+        }
+      }
+
       // If this item is equipped elsewhere, unequip it first
       let newEquipped = { ...state.equippedInstances };
       for (const [s, id] of Object.entries(newEquipped)) {
@@ -232,6 +260,11 @@ export function createCraftingSlice(
       // Equip to new slot
       newEquipped[slot] = instanceId;
 
+      // If 2-handed weapon, also clear offhand slot (should already be null from check above)
+      if (isTwoHanded && slot === 'mainHand') {
+        newEquipped.offHand = null;
+      }
+
       set(() => ({ equippedInstances: newEquipped }));
       return true;
     },