#ifndef MOS6502_H
#define MOS6502_H

#include <stdint.h>
#include <stdbool.h>

#define FLAG_C_BIT 0
#define FLAG_Z_BIT 1
#define FLAG_I_BIT 2
#define FLAG_D_BIT 3
#define FLAG_B_BIT 4
#define FLAG_U_BIT 5
#define FLAG_N_BIT 6
#define FLAG_V_BIT 7

#define FLAG_GET(f) ((cpu->flags & (1 << FLAG_##f##_BIT)) >> FLAG_##f##_BIT)
#define FLAG_SET(f, v) (cpu->flags = (cpu->flags & ~(1 << FLAG_##f##_BIT)) | ((v) << FLAG_##f##_BIT))

extern uint8_t bus_read(uint16_t addr, uint8_t cycle);
extern void bus_write(uint16_t addr, uint8_t v, uint8_t cycle);

typedef struct cpu_s {
	uint16_t pc;
	uint8_t a;
	uint8_t x;
	uint8_t y;
	uint8_t sp;
	uint8_t flags;

	bool irq;
	bool nmi;
	bool jammed;
} cpu_t;

void cpu_reset(cpu_t *cpu);
uint8_t cpu_step(cpu_t *cpu);

#endif