Made a big mess of the codebase

src/rpg/item/inventory.h

@@ -0,0 +1,63 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "itemstack.h"
+
+#define INVENTORY_SIZE_MAX UINT8_MAX
+
+typedef struct {
+  itemstack_t items[INVENTORY_SIZE_MAX];
+  uint8_t itemCount;
+  uint8_t size;
+} inventory_t;
+
+/**
+ * Initializes an inventory with a specified size.
+ * 
+ * @param inventory Pointer to the inventory to initialize.
+ * @param size The size of the inventory (maximum is INVENTORY_SIZE_MAX).
+ */
+void inventoryInit(inventory_t *inventory, const uint8_t size);
+
+/**
+ * Finds the index of the item of a specified type in the inventory.
+ * 
+ * @param inventory Pointer to the inventory to search.
+ * @param type The type of item to find.
+ * @return The index of the item, or INVENTORY_SIZE_MAX if not found.
+ */
+uint8_t inventoryItemIndexByType(
+  const inventory_t *inventory,
+  const itemtype_t type
+);
+
+/**
+ * Gets the count of items of a specified type in the inventory.
+ * 
+ * @param inventory Pointer to the inventory to check.
+ * @param type The type of item to count.
+ * @return The count of items of the specified type.
+ */
+uint8_t inventoryItemCount(
+  const inventory_t *inventory,
+  const itemtype_t type
+);
+
+/**
+ * Sets the count of items of a specified type in the inventory.
+ * If the item does not exist, it will be added.
+ * 
+ * @param inventory Pointer to the inventory to modify.
+ * @param type The type of item to set.
+ * @param count The count of items to set.
+ */
+void inventoryItemSet(
+  inventory_t *inventory,
+  const itemtype_t type,
+  const uint8_t count
+);