#ifndef GB_H
#define GB_H
#include <ragb_sdl.h>
#include <r_io.h>
#include <r_arch.h>
#include <r_esil.h>

enum {
	GB_TIMERS_DIV = 0,
	GB_TIMERS_TIMA,
	GB_TIMERS_TMA,
	GB_TIMERS_TAC,
	GB_TIMERS_N_REGS,
};

typedef struct gb_timers_t {
	ut64 seek;
	ut32 fd;
	ut16 odiv;
	ut16 div;
	ut8 buf[4];
	ut8 otma;
	st8 tima_wait;
	bool check_fedge;
} GBTimers;

GBTimers *gb_timers_open(RIO *io);
void gb_timers_update(GBTimers *timers, ut32 cycles);
void gb_timers_close(GBTimers *timers, RIO *io);

typedef struct gb_joypad_t {
	ut8 *keys;
	int fd;
	ut16 up;
	ut16 down;
	ut16 left;
	ut16 right;
	ut16 a;
	ut16 b;
	ut16 start;
	ut16 select;
	ut8 data;
	ut8 odata;
} GBJoypad;

GBJoypad *gb_joypad_open(RIO *io);
void gb_joypad_update(GBJoypad *joypad);
void gb_joypad_close(GBJoypad *joypad, RIO *io);

typedef struct gb_dma_t {
	ut64 seek;	//17 bit seek and some flags
	int dma_fd;	//fd representing the dma register
	int dma_bus_fd;	//fd representing the memory bus while dma occupies it
	int oam_fd;	//fd representing oam
	ut32 dma_bank_id;
	ut32 default_bank_id;
//	ut16 bus_occupancy_size;
	ut8 buf[0xa0];
	ut8 dst;	//current dst addr low byte
//	ut8 todo;	//cycles todo
	st8 frontrun;	//cycles that read/write ops had frontrun the dma copy
	ut8 val;
} GBDMA;

#define	GB_DMA_LAUNCH	0x20000
#define	GB_DMA_RUNNING	0x40000
#define	GB_DMA_ACTIVE	0x60000
#define	GB_DMA_CGB_MODE	0x80000

GBDMA *gb_dma_open(RIO *io);
//void gb_dma_enable_cgb(GBDMA *dma);
void gb_dma_update(GBDMA *dma, RIO *io, ut32 cycles, bool pre_exec);
void gb_dma_close(GBDMA *dma, RIO *io);

enum {
	GB_PPU_LCDC = 0,	//0xff40
	GB_PPU_STAT,		//0xff41
	GB_PPU_SCY,		//0xff42
	GB_PPU_SCX,		//0xff43
	GB_PPU_LY,		//0xff44
	GB_PPU_LYC,		//0xff45
	GB_PPU_BGP,		//0xff47
	GB_PPU_OBP0,		//0xff48
	GB_PPU_OBP1,		//0xff49
	GB_PPU_WY,		//0xff4a
	GB_PPU_WX,		//0xff4b
	GB_PPU_N_REGS,
};

typedef struct gb_dmg_ppu_t {
	ut64 seek;
	ut8 buf[GB_PPU_N_REGS];
	int reg_fd;
	int vram_fd;
} GBPPU;

#define	GB_PPU_MODE0	0
#define	GB_PPU_MODE1	0x10000
#define	GB_PPU_MODE2	0x20000
#define	GB_PPU_MODE3	0x30000
#define	GB_PPU_MODE_MASK	0x30000
#define	GB_PPU_DOUBLE_SPEED	0x40000

typedef struct gameboy_t {
	RIO *io;
	RArch *arch;
	GBTimers *timers;
	GBJoypad *joypad;
	GBDMA *dma;
	GBPPU *ppu;
	GBPixBuf *pixbuf;
	int cartrigde_fd;
	
} GB;

GBPPU *gb_ppu_open (RIO *io);
void gb_ppu_update (GB *gb, ut32 cycles);
void gb_ppu_close (GBPPU *ppu);

extern RIOPlugin r_io_plugin_gb_timers;
extern RIOPlugin r_io_plugin_gb_mbc1;
extern RIOPlugin r_io_plugin_gb_mbc2;
extern RIOPlugin r_io_plugin_gb_joypad;

#endif