#include "opcode.h"
#include <pthread.h>

#if bench
#include <sys/time.h>
#endif
#include <curses.h>

#define THREADS	1
#define BENCH_INST 100000000 << (THREADS-1)
#define CTRL_ADDR 0xC000
#define TX_ADDR 0xC001
#define RX_ADDR 0xC002
#define STEP_ADDR 0xC010
#define CURSES_BACKSPACE 0x7F

extern uint8_t kbd_rdy;

extern WINDOW *scr;

#if debug
extern uint8_t subdbg;
#endif


#define setflag(flag, bit) ((flag)) ? (cpu->ps.u8[thread] |= bit) : (cpu->ps.u8[thread] &= ~bit)
#define getflag(bit) (cpu->ps.u8[thread] & bit)

extern pthread_mutex_t mutex;
extern pthread_mutex_t main_mutex;
extern pthread_cond_t cond;
extern pthread_cond_t main_cond;

#if debug
extern void disasm(struct sux *cpu, uint64_t *operands, uint8_t lines, uint8_t opcode, uint8_t prefix, uint8_t thread);
#endif

extern void io(uint64_t address, uint8_t *esc);

static inline uint64_t get_addr(struct sux *cpu, uint64_t *tmpaddr, uint8_t opcode, uint8_t prefix, uint8_t thread) {
	union reg address;
	union reg value;
	uint8_t tmp = 0;
	address.u64 = 0;
	value.u64 = 0;
	switch (optype[opcode]) {
		case IMPL:
			break;
		case IMM:
			switch (opcode) {
				case PHB:
				case PHP:
				case PHA:
				case PHY:
				case PHX:
				case PLB:
				case PLP:
				case PLA:
				case PLY:
				case PLX:
				case STT:
				case LSL:
				case LSR:
				case ROL:
				case ROR:
				case ASR:
				case ENT:
					address.u64 = cpu->pc[thread];
					++cpu->pc[thread];
					break;
				default:
					address.u64 = cpu->pc[thread];
					cpu->pc[thread]+=(1 << (prefix >> 4));
				case TXS:
					break;
			}
			break;
		case ZM:
		case ZMX:
		case ZMY:
		case IND:
		case INDX:
		case INDY:
			tmp = 0;
			address.u8[0] = addr[cpu->pc[thread]];
			/* Unroll Loop by implementing Duff's Device. */
			switch ((prefix & 0x0C) >> 2) {
				case 2:
					address.u8[5] = addr[cpu->pc[thread]+5];++tmp;
					address.u8[4] = addr[cpu->pc[thread]+4];++tmp;
				case 3:
					address.u8[3] = addr[cpu->pc[thread]+3];++tmp;
				case 1:
					address.u8[2] = addr[cpu->pc[thread]+2];++tmp;
					address.u8[1] = addr[cpu->pc[thread]+1];++tmp;
				case 0:
					++tmp;
			}
			cpu->pc[thread]+=tmp;
			#if debug && !bench
			*tmpaddr = address.u64;
			#endif
			#if getclk
			iclk++;
			#endif
			uint64_t reg = 0;
			switch (optype[opcode]) {
				case ZMX:
					address.u64 += cpu->x[thread];
					#if getclk
					iclk++;
					#endif
					break;
				case ZMY:
					address.u64 += cpu->y[thread];
					#if getclk
					iclk++;
					#endif
					break;
				case INDX:
					address.u64 += cpu->x[thread];
					#if getclk
					iclk++;
					#endif
					/* Falls Through. */
				case INDY:
					/* Did we fall through? */
					if (optype[opcode] == INDX) {
						reg = 0; /* Yes, so set reg back to zero. */
					} else {
						reg = cpu->y[thread]; /* No, so set reg to Y. */
						#if getclk
						iclk++;
						#endif
					}
					/* Falls Through. */
				case IND:
					value.u8[0] = addr[address.u64  ];
					value.u8[1] = addr[address.u64+1];
					value.u8[2] = addr[address.u64+2];
					value.u8[3] = addr[address.u64+3];
					value.u8[4] = addr[address.u64+4];
					value.u8[5] = addr[address.u64+5];
					value.u8[6] = addr[address.u64+6];
					value.u8[7] = addr[address.u64+7];
					#if getclk
					iclk++;
					#endif
					value.u64 += reg;
					address.u64 = value.u64;
					break;
			}
			break;
		case ABS:
			tmp = 0;
			address.u8[0] = addr[cpu->pc[thread]];++tmp;
			/* Unroll Loop by implementing Duff's Device. */
			switch ((prefix & 0x0C) >> 2) {
				case 3:
					address.u8[7] = addr[cpu->pc[thread]+7];++tmp;
				case 2:
					address.u8[6] = addr[cpu->pc[thread]+6];++tmp;
					address.u8[5] = addr[cpu->pc[thread]+5];++tmp;
					#if getclk
					iclk++;
					#endif
				case 1:
					address.u8[4] = addr[cpu->pc[thread]+4];++tmp;
					address.u8[3] = addr[cpu->pc[thread]+3];++tmp;
					address.u8[2] = addr[cpu->pc[thread]+2];++tmp;
				case 0:
					address.u8[1] = addr[cpu->pc[thread]+1];++tmp;
			}
			cpu->pc[thread]+=tmp;
			#if getclk
			iclk++;
			#endif
			break;

	}
	return address.u64;
}

inline void adc(struct sux *cpu, uint64_t value, uint8_t thread) {
	uint64_t sum = cpu->a[thread]+value+getflag(C);
	setflag(sum == 0, Z);
	setflag((sum >> 63), N);
	setflag(((cpu->a[thread]^value) >> 63) && ((cpu->a[thread]^sum) >> 63), V);
	setflag((sum < value), C);
	cpu->a[thread] = sum;
}
inline void sbc(struct sux *cpu, uint64_t value, uint8_t thread) {
	uint64_t sum = cpu->a[thread]-value-!getflag(C);
	setflag(sum == 0, Z);
	setflag(sum >> 63, N);
	setflag(((cpu->a[thread]^value) >> 63) && ((cpu->a[thread]^sum) >> 63), V);
	setflag((sum > value), C);
	cpu->a[thread] = sum;
}

inline void transfer(struct sux *cpu, uint64_t value, uint8_t opcode, uint8_t prefix, uint8_t thread) {
	uint64_t reg;
	switch (opcode) {
                case TBA: cpu->a[thread] = cpu->b[thread]; reg = cpu->a[thread]; break;
                case TXA: cpu->a[thread] = cpu->x[thread]; reg = cpu->a[thread]; break;
                case TYA: cpu->a[thread] = cpu->y[thread]; reg = cpu->a[thread]; break;
                case TAB: cpu->b[thread] = cpu->a[thread]; reg = cpu->b[thread]; break;
		case TAY: cpu->y[thread] = cpu->a[thread]; reg = cpu->y[thread]; break;
		case TXY: cpu->y[thread] = cpu->x[thread]; reg = cpu->y[thread]; break;
                case TAX: cpu->x[thread] = cpu->a[thread]; reg = cpu->x[thread]; break;
                case TYX: cpu->x[thread] = cpu->y[thread]; reg = cpu->x[thread]; break;
                case TSX: cpu->x[thread] = cpu->sp[thread] & 0xFFFF; cpu->x[thread] = cpu->stk_st[thread] << 16; break;
                case TXS: cpu->sp[thread] = cpu->x[thread];
			if (prefix == 0x13 && (value == thread+1 || value > 8)) {
				cpu->stk_st[thread] = value & 0xFF;
				cpu->stk_st[thread] += value << 16;
				cpu->pc[thread]+=2;
			}
			break;
	}
	setflag(reg == 0, Z);
	setflag(reg >> 63, N);
}

inline void push(struct sux *cpu, uint64_t value, uint8_t opcode, uint8_t thread) {
	union {
		uint64_t reg;
		uint8_t byte[8];
	} r;
	r.reg = 0;
	uint8_t size = (value > 0) ? value-1 : 0;
	uint8_t tmp = (size <= 7) ? size : 7;
	switch (opcode) {
		case PHA: r.reg = cpu->a[thread]; break;
		case PHB: r.reg = cpu->b[thread]; break;
		case PHX: r.reg = cpu->x[thread]; break;
		case PHY: r.reg = cpu->y[thread]; break;
		case PHP: r.reg = cpu->ps.u64;    break;
	}
	/* Unroll Loop by implementing Duff's Device. */
	switch (tmp) {
		case 7:	addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]] = r.byte[7];cpu->sp[thread]--;
		case 6:	addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]] = r.byte[6];cpu->sp[thread]--;
		case 5:	addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]] = r.byte[5];cpu->sp[thread]--;
		case 4:	addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]] = r.byte[4];cpu->sp[thread]--;
		case 3:	addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]] = r.byte[3];cpu->sp[thread]--;
		case 2:	addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]] = r.byte[2];cpu->sp[thread]--;
		case 1:	addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]] = r.byte[1];cpu->sp[thread]--;
		case 0: addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]] = r.byte[0];cpu->sp[thread]--;
	}
}

inline void pull(struct sux *cpu, uint64_t value, uint8_t opcode, uint8_t thread) {
	union {
		uint64_t reg;
		uint8_t byte[8];
	} r;
	r.reg = 0;
	uint8_t size = (value > 0) ? value-1 : 0;
	uint8_t tmp = (size <= 7) ? size : 7;
	uint8_t tmp2 = 0;
	/* Unroll Loop by implementing Duff's Device. */
	cpu->sp[thread]++;r.byte[tmp2] = addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]];
	switch (tmp) {
		case 7:	cpu->sp[thread]++;tmp2++;r.byte[tmp2] |= addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]];
		case 6:	cpu->sp[thread]++;tmp2++;r.byte[tmp2] |= addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]];
		case 5:	cpu->sp[thread]++;tmp2++;r.byte[tmp2] |= addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]];
		case 4:	cpu->sp[thread]++;tmp2++;r.byte[tmp2] |= addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]];
		case 3:	cpu->sp[thread]++;tmp2++;r.byte[tmp2] |= addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]];
		case 2:	cpu->sp[thread]++;tmp2++;r.byte[tmp2] |= addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]];
		case 1:	cpu->sp[thread]++;tmp2++;r.byte[tmp2] |= addr[(cpu->stk_st[thread] << 16)+cpu->sp[thread]];
	}
	switch (opcode) {
		case PLA: cpu->a[thread] = r.reg; break;
		case PLB: cpu->b[thread] = r.reg; break;
		case PLX: cpu->x[thread] = r.reg; break;
		case PLY: cpu->y[thread] = r.reg; break;
		case PLP: cpu->ps.u64    = r.reg; break;
	}
}

inline void and(struct sux *cpu, uint64_t value, uint8_t thread) {
	cpu->a[thread] &= value;
	setflag(cpu->a[thread] == 0, Z);
	setflag(cpu->a[thread] >> 63, N);
}
inline void or(struct sux *cpu, uint64_t value, uint8_t thread) {
	cpu->a[thread] |= value;
	setflag(cpu->a[thread] == 0, Z);
	setflag(cpu->a[thread] >> 63, N);
}
inline void xor(struct sux *cpu, uint64_t value, uint8_t thread) {
	cpu->a[thread] ^= value;
	setflag(cpu->a[thread] == 0, Z);
	setflag(cpu->a[thread] >> 63, N);
}

inline void lsl(struct sux *cpu, uint64_t value, uint8_t thread) {
	uint64_t sum = (value < 64) ? cpu->a[thread] << value : 0;
	setflag(sum == 0, Z);
	setflag(sum >> 63, N);
	setflag(cpu->a[thread] >> (64-value), C);
	cpu->a[thread] = sum;
}

inline void lsr(struct sux *cpu, uint64_t value, uint8_t thread) {
	uint64_t sum = (value < 64) ? cpu->a[thread] >> value : 0;
	setflag(sum == 0, Z);
	setflag(sum >> 63, N);
	setflag(cpu->a[thread] & 1, C);
	cpu->a[thread] = sum;
}

inline void asr(struct sux *cpu, uint64_t value, uint8_t thread) {
	uint8_t sign = cpu->a[thread] >> 63;
	uint64_t sum = (value < 64) ? (cpu->a[thread] >> value) | ((uint64_t)sign << 63) : 0;
	setflag(sum == 0, Z);
	setflag(sum >> 63, N);
	setflag(cpu->a[thread] & 1, C);
	cpu->a[thread] = sum;
}

inline void rol(struct sux *cpu, uint64_t value, uint8_t thread) {
	uint64_t sum = cpu->a[thread] << value;
	sum |= getflag(C);
	setflag(sum == 0, Z);
	setflag(sum >> 63, N);
	setflag(cpu->a[thread] >> (uint64_t)(64-value), C);
	cpu->a[thread] = sum;
}

inline void ror(struct sux *cpu, uint64_t value, uint8_t thread) {
	uint64_t sum = cpu->a[thread] >> value;
	sum |= (uint64_t)getflag(C) << (uint64_t)(64-value);
	setflag(sum == 0, Z);
	setflag(sum >> 63, N);
	setflag(cpu->a[thread] & 1, C);
	cpu->a[thread] = sum;
}
inline void mul(struct sux *cpu, uint64_t value, uint8_t thread) {
	uint64_t sum = cpu->a[thread]*value;
	cpu->a[thread] = sum;
	setflag(sum == 0, Z);
	setflag(sum >> 63, N);
	setflag(!((cpu->a[thread]^value) >> 63) && ((cpu->a[thread]^sum) >> 63), V);
}

inline void divd(struct sux *cpu, uint64_t value, uint8_t opcode, uint8_t thread) {
	uint64_t sum = cpu->a[thread]/value;
	if (opcode != DAB) {
		cpu->b[thread] = cpu->a[thread] % value;
	} else {
		value = cpu->b[thread];
		cpu->x[thread] = cpu->a[thread] % value;
	}
	cpu->a[thread] = sum;
	setflag(sum == 0, Z);
	setflag((sum >> 63), N);
}
inline void cmp(struct sux *cpu, uint64_t value, uint8_t opcode, uint8_t thread) {
	uint64_t reg;
	switch (opcode) {
		case CPB:
		case CPB_AB:
		case CPB_Z:
		case CPB_IN:
		case CPB_IX:
		case CPB_IY:
			reg = cpu->b[thread];
			break;
		case CMP:
		case CAB:
		case CMP_AB:
		case CMP_Z:
		case CMP_IN:
		case CMP_IX:
		case CMP_IY:
			reg = cpu->a[thread];
			break;
		case CPY:
		case CPY_AB:
		case CPY_Z:
		case CPY_IN:
			reg = cpu->y[thread];
			break;

		case CPX:
		case CPX_AB:
		case CPX_Z:
		case CPX_IN:
			reg = cpu->x[thread];
			break;
	}
	uint64_t sum = reg-value;
	setflag(sum >> 63, N);
	setflag(((reg^value) >> 63) && ((reg^sum) >> 63), V);
	setflag(sum == 0, Z);
	setflag(reg >= value, C);
}

inline void incr(struct sux *cpu, uint8_t opcode, uint8_t thread) {
	uint64_t reg;
	switch (opcode) {
		case INC: cpu->a[thread]+=1; reg = cpu->a[thread]; break;
		case INB: cpu->b[thread]+=1; reg = cpu->b[thread]; break;
		case INY: cpu->y[thread]+=1; reg = cpu->y[thread]; break;
		case INX: cpu->x[thread]+=1; reg = cpu->x[thread]; break;
	}
	setflag(reg == 0, Z);
	setflag(reg >> 63, N);
}

inline void decr(struct sux *cpu, uint8_t opcode, uint8_t thread) {
	uint64_t reg;
	switch (opcode) {
		case DEC: cpu->a[thread]-=1; reg = cpu->a[thread]; break;
		case DEB: cpu->b[thread]-=1; reg = cpu->b[thread]; break;
		case DEY: cpu->y[thread]-=1; reg = cpu->y[thread]; break;
		case DEX: cpu->x[thread]-=1; reg = cpu->x[thread]; break;
	}
	setflag(reg == 0, Z);
	setflag(reg >> 63, N);
}

inline void incm(struct sux *cpu, uint64_t address, uint8_t thread) {
	addr[address]++;
	setflag(addr[address] == 0, Z);
	setflag(addr[address] >> 7, N);
}

inline void decm(struct sux *cpu, uint64_t address, uint8_t thread) {
	addr[address]--;
	setflag(addr[address] == 0, Z);
	setflag(addr[address] >> 7, N);
}

inline void load(struct sux *cpu, uint64_t address, uint8_t *esc, uint8_t opcode, uint8_t prefix, uint8_t thread) {
	if (address == CTRL_ADDR) {
		io(address, esc);
	}
	union reg value;
	value.u64 = 0;
	/* Unroll Loop by implementing Duff's Device. */
	value.u8[0] = addr[address];
	switch (1 << (prefix >> 4)) {
		case 8:
			value.u8[7] = addr[address+7];
			value.u8[6] = addr[address+6];
			value.u8[5] = addr[address+5];
			value.u8[4] = addr[address+4];
		case 4:
			value.u8[3] = addr[address+3];
			value.u8[2] = addr[address+2];
		case 2:
			value.u8[1] = addr[address+1];
	}
	switch (opcode) {
		case LDB:
		case LDB_AB:
		case LDB_Z:
		case LDB_ZX:
		case LDB_ZY:
		case LDB_IN:
		case LDB_IX:
		case LDB_IY:
			cpu->b[thread] = value.u64;
			break;
		case LDA:
		case LDA_AB:
		case LDA_Z:
		case LDA_ZX:
		case LDA_ZY:
		case LDA_IN:
		case LDA_IX:
		case LDA_IY:
			cpu->a[thread] = value.u64;
			break;
		case LDY:
		case LDY_AB:
		case LDY_Z:
		case LDY_ZX:
		case LDY_IN:
			cpu->y[thread] = value.u64;
			break;

		case LDX:
		case LDX_AB:
		case LDX_Z:
		case LDX_ZY:
		case LDX_IN:
			cpu->x[thread] = value.u64;
			break;
	}
	setflag(value.u64 == 0, Z);
	setflag(value.u64 >> 63, N);
}

inline void store(struct sux *cpu, uint64_t address, uint8_t *esc, uint8_t opcode, uint8_t prefix, uint8_t thread) {
	union reg value;
	value.u64 = 0;
	switch (opcode) {
		case STB:
		case STB_Z:
		case STB_ZX:
		case STB_ZY:
		case STB_IN:
		case STB_IX:
		case STB_IY:
			value.u64 = cpu->b[thread];
			break;
		case STA:
		case STA_Z:
		case STA_ZX:
		case STA_ZY:
		case STA_IN:
		case STA_IX:
		case STA_IY:
			value.u64 = cpu->a[thread];
			break;
		case STY:
		case STY_Z:
		case STY_ZX:
		case STY_IN:
			value.u64 = cpu->y[thread];
			break;

		case STX:
		case STX_Z:
		case STX_ZY:
		case STX_IN:
			value.u64 = cpu->x[thread];
			break;
	}
	addr[address] = value.u8[0];
	#if (IO || debug) && !branch
	#if keypoll
	pthread_mutex_lock(&mutex);
	#endif
	if (address != CTRL_ADDR && address == TX_ADDR) {
		io(address, esc);
	}
	#if keypoll
	pthread_mutex_unlock(&mutex);
	#endif
	#endif
	/* Unroll Loop by implementing Duff's Device. */
	switch (1 << (prefix >> 4)) {
		case 8:
			addr[address+7] = value.u8[7];
			addr[address+6] = value.u8[6];
			addr[address+5] = value.u8[5];
			addr[address+4] = value.u8[4];
		case 4:
			addr[address+3] = value.u8[3];
			addr[address+2] = value.u8[2];
		case 2:
			addr[address+1] = value.u8[1];
	}
}