'use strict';

const { AddrMode } = require('./enum.js');


exports.DAT = function(core, pc, ins) {
	// do nothing and die
	return [];
}


exports.MOV = function(core, pc, ins) {
	if (ins.a.mode === AddrMode.Immediate) {
		const dst = core.getValue(pc, ins.b);
		dst.b.value = ins.a.value;
	} else {
		const src = core.getValue(pc, ins.a);
		const dstLocation = core.getLocation(pc, ins.b);
		// hacky deep copy
		core.data[dstLocation] = JSON.parse(JSON.stringify(src));
	}

	return [pc + 1];
}


exports.ADD = function(core, pc, ins) {
	if (ins.a.mode === AddrMode.Immediate) {
		const dst = core.getValue(pc, ins.b);
		dst.b.value += ins.a.value;
	} else {
		const src = core.getValue(pc, ins.a);
		const dst = core.getValue(pc, ins.b);
		dst.a.value += src.a.value;
		dst.b.value += src.b.value;
	}

	return [pc + 1];
}


exports.SUB = function(core, pc, ins) {
	if (ins.a.mode === AddrMode.Immediate) {
		const dst = core.getValue(pc, ins.b);
		dst.b.value -= ins.a.value;
	} else {
		const src = core.getValue(pc, ins.a);
		const dst = core.getValue(pc, ins.b);
		dst.a.value -= src.a.value;
		dst.b.value -= src.b.value;
	}

	return [pc + 1];
}