#include <stdint.h>

struct cpu_flags {
	uint8_t carry : 1;
	uint8_t zero : 1;
	uint8_t interrupt_disable : 1;
	uint8_t decimal_mode : 1;
	uint8_t brk : 1;
	uint8_t unused : 1;
	uint8_t overflow : 1;
	uint8_t negative : 1;
};

struct registers {
	uint8_t acc, x, y, sp;
	struct cpu_flags status;
	uint16_t pc;
};
struct registers regs;

enum addressing_mode {
	AM_ACCUMULATOR,
	AM_IMMEDIATE,
	AM_ZERO_PAGE,
	AM_ZERO_PAGE_X,
	AM_ZERO_PAGE_Y,
	AM_RELATIVE,
	AM_ABSOLUTE,
	AM_ABSOLUTE_X,
	AM_ABSOLUTE_Y,
	AM_INDIRECT,
	AM_INDIRECT_X,
	AM_INDIRECT_Y,
	AM_INDEXED_INDIRECT,
	AM_INDIRECT_INDEXED,
};

uint8_t addrbus[0x10000];

/* example program taken from https://bugzmanov.github.io/nes_ebook/chapter_3_1.html */
uint8_t program[] = { 0xa9, 0xc0, 0xaa, 0xe8, 0x00 };

void interpret(void)
{
	uint8_t opcode;
	regs.pc = 0;

	for (;;) {
		opcode = program[regs.pc++];

		switch (opcode) {
		default:
			break;
		}
	}
}