#ifndef VB_H_
#define VB_H_

#ifdef __cplusplus
extern "C" {
#endif

#ifndef VBAPI
#define VBAPI extern
#endif

/* Header includes */
#include <stddef.h>
#include <stdint.h>



/********************************* Constants *********************************/

/* Callback IDs */
#define VB_EXCEPTION 0
#define VB_EXECUTE   1
#define VB_FETCH     2
#define VB_FRAME     3
#define VB_READ      4
#define VB_WRITE     5

/* System registers */
#define VB_ADTRE 25
#define VB_CHCW  24
#define VB_ECR    4
#define VB_EIPC   0
#define VB_EIPSW  1
#define VB_FEPC   2
#define VB_FEPSW  3
#define VB_PIR    6
#define VB_PSW    5
#define VB_TKCW   7

/* Memory access data types */
#define VB_S8  0
#define VB_U8  1
#define VB_S16 2
#define VB_U16 3
#define VB_S32 4



/*********************************** Types ***********************************/

/* Simulation state */
typedef struct VB VB;

/* Callbacks */
typedef int (*vbOnExecute)(VB *sim, uint32_t address, const uint16_t *code, int length);
typedef int (*vbOnFetch  )(VB *sim, int fetch, uint32_t address, int32_t *value, uint32_t *cycles);
typedef int (*vbOnRead   )(VB *sim, uint32_t address, int type, int32_t *value, uint32_t *cycles);
typedef int (*vbOnWrite  )(VB *sim, uint32_t address, int type, int32_t *value, uint32_t *cycles, int *cancel);




/******************************* API Commands ********************************/

VBAPI int         vbEmulate           (VB *sim, uint32_t *clocks);
VBAPI int         vbEmulateEx         (VB **sims, int count, uint32_t *clocks);
VBAPI void*       vbGetCallback       (VB *sim, int id);
VBAPI void*       vbGetCartRAM        (VB *sim, uint32_t *size);
VBAPI void*       vbGetCartROM        (VB *sim, uint32_t *size);
VBAPI vbOnExecute vbGetExecuteCallback(VB *sim);
VBAPI vbOnFetch   vbGetFetchCallback  (VB *sim);
VBAPI uint32_t    vbGetProgramCounter (VB *sim);
VBAPI int32_t     vbGetProgramRegister(VB *sim, int index);
VBAPI vbOnRead    vbGetReadCallback   (VB *sim);
VBAPI uint32_t    vbGetSystemRegister (VB *sim, int index);
VBAPI void*       vbGetUserData       (VB *sim);
VBAPI vbOnWrite   vbGetWriteCallback  (VB *sim);
VBAPI VB*         vbInit              (VB *sim);
VBAPI int32_t     vbRead              (VB *sim, uint32_t address, int type);
VBAPI VB*         vbReset             (VB *sim);
VBAPI int         vbSetCartRAM        (VB *sim, void *sram, uint32_t size);
VBAPI int         vbSetCartROM        (VB *sim, void *rom, uint32_t size);
VBAPI vbOnExecute vbSetExecuteCallback(VB *sim, vbOnExecute callback);
VBAPI vbOnFetch   vbSetFetchCallback  (VB *sim, vbOnFetch callback);
VBAPI uint32_t    vbSetProgramCounter (VB *sim, uint32_t value);
VBAPI int32_t     vbSetProgramRegister(VB *sim, int index, int32_t value);
VBAPI vbOnRead    vbSetReadCallback   (VB *sim, vbOnRead callback);
VBAPI uint32_t    vbSetSystemRegister (VB *sim, int index, uint32_t value);
VBAPI void*       vbSetUserData       (VB *sim, void *tag);
VBAPI vbOnWrite   vbSetWriteCallback  (VB *sim, vbOnWrite callback);
VBAPI size_t      vbSizeOf            ();
VBAPI int32_t     vbWrite             (VB *sim, uint32_t address, int type, int32_t value);



#ifdef __cplusplus
}
#endif

#endif /* VB_H_ */