#ifndef CPU_6502_H
#define CPU_6502_H

#include <inttypes.h>
#include <stdbool.h>

typedef struct
{
	uint8_t A;
	uint8_t X;
	uint8_t Y;
	uint8_t SP;
	uint16_t PC;
	uint8_t PS;
	
	struct memory_t *memory;
	
	bool debug;
	
	int steps;
} cpu_6502_t;

enum {
	PS_N = 0x80,
	PS_V = 0x40,
	PS_B = 0x10,
	PS_D = 0x08,
	PS_I = 0x04,
	PS_Z = 0x02,
	PS_C = 0x01
};

enum {
	LDX_IMM  = 0xA2,
	LDX_ZERO = 0xA6,
	LDY_IMM  = 0xA0,
	LDY_ZERO = 0xA4,
	LDA_IMM  = 0xA9,
	LDA_ZERO = 0xA5,
	STX_ABS  = 0x8E,
	DEY_IMPL = 0x88,
	ROL_ACC  = 0x2A,
	BNE_REL  = 0xD0,
	BCC_REL  = 0x90,
	JMP_ABS  = 0x4C,
	JSR_ABS  = 0x20,
	RTS_IMPL = 0x60,
	TXS_IMPL = 0x9A
};

void cpu_6502_init( cpu_6502_t *cpu, struct memory_t *memory );
void cpu_6502_reset( cpu_6502_t *cpu );
uint8_t cpu_6502_read_byte( cpu_6502_t *cpu, uint16_t addr );
uint16_t cpu_6502_read_word( cpu_6502_t *cpu, uint16_t addr );
void cpu_6502_write_byte( cpu_6502_t *cpu, uint16_t addr, uint8_t data );
void cpu_6502_push_byte( cpu_6502_t *cpu, uint8_t data );
void cpu_6502_push_word( cpu_6502_t *cpu, uint16_t data );
uint8_t cpu_6502_pop_byte( cpu_6502_t *cpu );
uint16_t cpu_6502_pop_word( cpu_6502_t *cpu );
void cpu_6502_run( cpu_6502_t *cpu, int steps );
void cpu_6502_step( cpu_6502_t *cpu );
void cpu_6502_print_state( cpu_6502_t *cpu, uint8_t opcode );
void cpu_6502_print_memory( cpu_6502_t *cpu, uint16_t base, uint8_t size );
void cpu_6502_print_stack( cpu_6502_t *cpu );
void cpu_6502_print_zerop_page( cpu_6502_t *cpu );

#endif