item.h

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#ifndef ITEM_H
#define ITEM_H
 
#include "mgba_logger.h"
#include "random.h"
#include "sprite.h"
 
// TODO: Merge these with GBAL_RETURN_IF_NULL macros?
#define ITEM_RETURN_IF_UNEXPECTED_TYPE_RET(item, expected_type, ret_val)         \
    do                                                                           \
    {                                                                            \
        if ((item)->type != expected_type)                                       \
        {                                                                        \
            MGBA_FUNC_ERROR("Unexpected %s->type != %s", #item, #expected_type); \
            return (ret_val);                                                    \
        }                                                                        \
    } while (0)
 
#define ITEM_RETURN_IF_UNEXPECTED_TYPE_VOID(item, expected_type)                 \
    do                                                                           \
    {                                                                            \
        if ((item)->type != expected_type)                                       \
        {                                                                        \
            MGBA_FUNC_ERROR("Unexpected %s->type != %s", #item, #expected_type); \
            return;                                                              \
        }                                                                        \
    } while (0)
 
enum ItemType
{
    ITEM_TYPE_JOKER,
    ITEM_TYPE_PLAYING_CARD,
 
    // Future planned item types
    // ITEM_TYPE_CONSUMABLE, // Expand to PLANET, TAROT, and SPECTRAL?
    // ITEM_TYPE_VOUCHER,
    // ITEM_TYPE_PACK
 
    ITEM_NUM_TYPES
};
 
typedef struct Item
{
    SpriteObject;
 
    enum ItemType type;
} Item;
 
typedef struct ItemFuncs
{
    Item* (*roll_new)(enum RngSequence key);
    int (*get_buy_price)(Item* item);
    bool (*can_acquire)(Item* item);
    void (*acquire)(Item* item);
    void (*dispose)(Item** item);
    // TODO: void (*print_description)(Item* item); // or something of the form
 
    // Optional implementation functions will be added here
} ItemFuncs;
 
Item* item_roll_new(enum ItemType item_type, enum RngSequence key);
 
int item_get_buy_price(Item* item);
 
void item_acquire(Item* item);
 
bool item_can_acquire(Item* item);
 
void item_dispose(Item** item);
 
void item_print_buy_price_under(Item* item);
 
#endif // ITEM_H