#ifndef COMMON_H
#define COMMON_H

#include "global.h"

struct Entity_;

/**
 * Holds input information from system registers.
 */
typedef struct {
    u16 heldKeys; /**< Keys held since last frame. */
    u16 newKeys;  /** Keys newly pressed this frame. */
    u16 unk4;
    u8 unk6;
    u8 unk7;
} Input;
extern Input gInput; /**< Input instance. */

typedef struct {
    u8 evt_type;
    u8 entity_idx;
    u8 area;
    u8 room;
    u16 _4;
    u16 _6;
    u16 x;
    u16 y;
    u16 _c;
    u16 _e;
    u8 _10;
    u8 _11;
    u16 flag;
} struct_080FE320;
extern struct_080FE320 gUnk_080FE320[];

void LoadPalettes(const u8*, s32, s32);

/**
 * Loads a packed group of palettes.
 *
 * @param group Group number.
 */
void LoadPaletteGroup(u32 group);

/**
 * Loads a packed group of tiles.
 *
 * @param group Group number.
 */
void LoadGfxGroup(u32 group);

/**
 * Set color in the palette.
 *
 * @param colorIndex Color index.
 * @param color Color.
 */
void SetColor(u32 colorIndex, u32 color);

void SetFillColor(u32 color, u32 arg1);

/**
 * Fill memory with 16 bit value.
 *
 * @param value Fill value.
 * @param dest Destination.
 * @param size Byte count.
 */
void MemFill16(u32 value, void* dest, u32 size);

/**
 * Fill memory with 32 bit value.
 *
 * @param value Fill value.
 * @param dest Destination.
 * @param size Byte count.
 */
void MemFill32(u32 value, void* dest, u32 size);

/**
 * Clear memory.
 *
 * @param dest Destination
 * @param size Byte count.
 */
void MemClear(void* dest, u32 size);

/**
 * Copy memory.
 *
 * @param src Source.
 * @param dest Destination.
 * @param size Byte count.
 */
void MemCopy(const void* src, void* dest, u32 size);

/**
 * Refresh #gInput from system registers.
 */
void ReadKeyInput(void);

/**
 * Initialize the heap.
 */
void zMallocInit(void);

/**
 * Allocate memory on heap.
 *
 * The heap size is 0x1000 bytes and should be used sparingly.
 * It is customary for entities store the returned pointer in the Entity.myHeap field.
 *
 * @param size u32 Size to be allocated.
 * @return Pointer to allocated memory.
 */
void* zMalloc(u32 size);

/**
 * Free memory from heap.
 * The Entity system will automatically free the pointer stored in the Entity.myHeap field.
 *
 * @param ptr Pointer to be freed.
 */
void zFree(void* ptr);

/**
 * Reset All display system registers.
 *
 * @param refresh Request refresh of HUD layer (bg 0).
 */
void DispReset(bool32 refresh);

u32 CheckPlayerProximity(u32, u32, u32, u32);
u32 CheckKinstoneFused(u32);
void sub_0801E1EC(u32, u32, u32);
void sub_0801DD58(u32, u32);
void sub_0801E1B8(u32, u32);
void sub_0801E738(u32);
void sub_0801DFB4(struct Entity_*, u32, u32, u32);
u32 sub_0801E00C(void);
bool32 sub_0801E810(u32);
u32 sub_0801DB94(void);

#endif // COMMON_H