Nooncraft/src/item.h

// nooncraft.item: Item storage and properties

#pragma once
#include <cstdint>
#include "render.h"

enum class ToolKind: uint8_t {
    Pickaxe, Axe, Shovel, Hoe,
};

enum class ItemType: uint8_t {
    Block, Item, Tool,
};

/* TODO: Generate Item IDs dynamically */
enum class ItemID: int16_t {
    COAL            = 0,
    IRON_INGOT      = 1,
    GOLD_INGOT      = 2,
    DIAMOND         = 3,
    WOODEN_PICKAXE  = 4,
};

#include "block.h"

struct ItemInfo
{
    char const *name;
    GlyphCluster cluster;

    bool isTool;
    ToolKind toolKind;
    /* Wooden, Stone, Iron, Gold, Diamond */
    uint8_t toolLevel;
    uint8_t stackSize;
};

struct Item
{
    bool isBlock;
    union {
        Block block;
        ItemID itemID;
    };

    Item(): isBlock {false}, itemID {-1} {}
    Item(ItemID id): isBlock {false}, itemID {(int)id} {}

    bool isNull() const {
        return !isBlock && (int)itemID == -1;
    }

    constexpr bool operator==(Item const &other) {
        return isBlock == other.isBlock &&
            (isBlock ? block == other.block : itemID == other.itemID);
    }

    /* Complex access methods */
    int stackSize() const;
};

struct BlockInfo;

namespace Nooncraft {

/* TODO: Move as methods of Item */

ItemInfo *getItemInfo(Item const &i);

BlockInfo *getItemBlockInfo(Item const &i);

GlyphCluster getItemCluster(Item const &i);

char const *getItemName(Item const &i);

} /* namespace Nooncraft */

struct ItemStack
{
    Item item;
    unsigned int qty;

    ItemStack(): item {}, qty {0} {}
    ItemStack(Item i): item {i}, qty {1} {}

    int stackSize() const {
        return item.stackSize();
    }
    bool isFull() const {
        return (int)qty >= item.stackSize();
    }
    bool isNull() const {
        return item.isNull();
    }
    bool canReceiveExtraItems(int count) const {
        return (int)qty + count <= item.stackSize();
    }
    char const *name() const {
        return Nooncraft::getItemName(item);
    }
    GlyphCluster cluster() const {
        return Nooncraft::getItemCluster(item);
    }
};