#include"apple.h"

// The Incredible Wozmon!
const byte ROM[256] = {
	0xd8, 0x58, 0xa0, 0x7f, 0x8c, 0x12, 0xd0, 0xa9,
	0xa7, 0x8d, 0x11, 0xd0, 0x8d, 0x13, 0xd0, 0xc9,
	0xdf, 0xf0, 0x13, 0xc9, 0x9b, 0xf0, 0x03, 0xc8,
	0x10, 0x0f, 0xa9, 0xdc, 0x20, 0xef, 0xff, 0xa9,
	0x8d, 0x20, 0xef, 0xff, 0xa0, 0x01, 0x88, 0x30,
	0xf6, 0xad, 0x11, 0xd0, 0x10, 0xfb, 0xad, 0x10,
	0xd0, 0x99, 0x00, 0x02, 0x20, 0xef, 0xff, 0xc9,
	0x8d, 0xd0, 0xd4, 0xa0, 0xff, 0xa9, 0x00, 0xaa,
	0x0a, 0x85, 0x2b, 0xc8, 0xb9, 0x00, 0x02, 0xc9,
	0x8d, 0xf0, 0xd4, 0xc9, 0xae, 0x90, 0xf4, 0xf0,
	0xf0, 0xc9, 0xba, 0xf0, 0xeb, 0xc9, 0xd2, 0xf0,
	0x3b, 0x86, 0x28, 0x86, 0x29, 0x84, 0x2a, 0xb9,
	0x00, 0x02, 0x49, 0xb0, 0xc9, 0x0a, 0x90, 0x06,
	0x69, 0x88, 0xc9, 0xfa, 0x90, 0x11, 0x0a, 0x0a,
	0x0a, 0x0a, 0xa2, 0x04, 0x0a, 0x26, 0x28, 0x26,
	0x29, 0xca, 0xd0, 0xf8, 0xc8, 0xd0, 0xe0, 0xc4,
	0x2a, 0xf0, 0x97, 0x24, 0x2b, 0x50, 0x10, 0xa5,
	0x28, 0x81, 0x26, 0xe6, 0x26, 0xd0, 0xb5, 0xe6,
	0x27, 0x4c, 0x44, 0xff, 0x6c, 0x24, 0x00, 0x30,
	0x2b, 0xa2, 0x02, 0xb5, 0x27, 0x95, 0x25, 0x95,
	0x23, 0xca, 0xd0, 0xf7, 0xd0, 0x14, 0xa9, 0x8d,
	0x20, 0xef, 0xff, 0xa5, 0x25, 0x20, 0xdc, 0xff,
	0xa5, 0x24, 0x20, 0xdc, 0xff, 0xa9, 0xba, 0x20,
	0xef, 0xff, 0xa9, 0xa0, 0x20, 0xef, 0xff, 0xa1,
	0x24, 0x20, 0xdc, 0xff, 0x86, 0x2b, 0xa5, 0x24,
	0xc5, 0x28, 0xa5, 0x25, 0xe5, 0x29, 0xb0, 0xc1,
	0xe6, 0x24, 0xd0, 0x02, 0xe6, 0x25, 0xa5, 0x24,
	0x29, 0x07, 0x10, 0xc8, 0x48, 0x4a, 0x4a, 0x4a,
	0x4a, 0x20, 0xe5, 0xff, 0x68, 0x29, 0x0f, 0x09,
	0xb0, 0xc9, 0xba, 0x90, 0x02, 0x69, 0x06, 0x2c,
	0x12, 0xd0, 0x30, 0xfb, 0x8d, 0x12, 0xd0, 0x60,
	0x00, 0x00, 0x00, 0x0f, 0x00, 0xff, 0x00, 0x00
};

void AppleOn() {
	Memory = calloc(MEMORY_SIZE, sizeof(byte));
	//ROM = calloc(256, sizeof(byte));
	InitInstructionTable();
	PC = 0xFF00;
	// Load ROM (alternative)
	/*FILE *ROM_File = fopen ("rom.bin", "rb");
	if (ROM_File == NULL) {
		printf("\n\rROM does not exist.\n");
		abort();
	}
	for (int i = 0; i < 128; i++) {
		// Retrieve in reversed order.
		ROM[(2*i)+1] = fgetc(ROM_File);
		ROM[(2*i)  ] = fgetc(ROM_File);
	}*/
}

void AppleReset(){
	acc = 0; X = 0; Y = 0; P = 0; S = 0;
	idata.cycles = 0; idata.length = 0; idata.add = 0; idata.value = 0;
	PC = 0xFF00;
	free(Memory);
	Memory = calloc(MEMORY_SIZE, sizeof(byte));
}

byte GetMemory(address x){
	switch(x)
	{
		// The keyboard does not act precisely as the real hardware, because there is no need to wait for the keyboard.
		// So KBD_CR and DSP always return a high high-order bit, and when the keyboard data is requested it will wait for UserInput() to finish.
	case KBD:
		char c = -1;
		while(c == -1)
			c = UserInput();
		return 0b10000000 | c;
	case KBD_CR:
		return 0b10000000;
	case DSP:
		return 0b00000000;
	}

	if (x >= 0xFF00 && x <= 0xFFFF) {
		return ROM[0x00FF & x];
	}

	if (x < MEMORY_SIZE)
		return Memory[x];
	
	return -1;
}

void SetMemory(address x, byte y){
	switch(x)
		{
		case DSP:
			DisplayInput(y);
		}
	if (x < MEMORY_SIZE) {
		Memory[x] = y;
	}
}



byte UserInput()
{
	#ifdef GRAPHICAL

	#else
	int c = getch();
	#endif
	
	switch(c)
		{
		case 0x08:
			return BS;
		case 0x0A:
			return CR;
		case 0x1B:
			return ESC;
		}
		
	if (c < 0x20)
		return -1;

	if (c >= 0x60)
		return -1;

	return c;
}