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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.sysml.runtime.instructions.cp;

import org.apache.sysml.runtime.DMLRuntimeException;
import org.apache.sysml.runtime.functionobjects.Not;
import org.apache.sysml.runtime.instructions.InstructionUtils;
import org.apache.sysml.runtime.matrix.operators.Operator;
import org.apache.sysml.runtime.matrix.operators.SimpleOperator;


public abstract class UnaryCPInstruction extends ComputationCPInstruction
{
	
	public UnaryCPInstruction(Operator op, CPOperand in, CPOperand out,
			String opcode, String instr) {
		this (op, in, null, null, out, opcode, instr);
	}

	public UnaryCPInstruction(Operator op, CPOperand in1, CPOperand in2, CPOperand out,
			String opcode, String instr) {
		this (op, in1, in2, null, out, opcode, instr);
	}

	public UnaryCPInstruction(Operator op, CPOperand in1, CPOperand in2, CPOperand in3, CPOperand out,
			String opcode, String instr) {
		super(op, in1, in2, in3, out, opcode, instr);
	}

	static String parseUnaryInstruction(String instr, CPOperand in,
			CPOperand out) throws DMLRuntimeException {
		InstructionUtils.checkNumFields(instr, 2);
		return parse(instr, in, null, null, out);
	}

	static String parseUnaryInstruction(String instr, CPOperand in1,
			CPOperand in2, CPOperand out) throws DMLRuntimeException {
		InstructionUtils.checkNumFields(instr, 3);
		return parse(instr, in1, in2, null, out);
	}

	static String parseUnaryInstruction(String instr, CPOperand in1,
			CPOperand in2, CPOperand in3, CPOperand out) throws DMLRuntimeException {
		InstructionUtils.checkNumFields(instr, 4);
		return parse(instr, in1, in2, in3, out);
	}

	static String parse(String instr, CPOperand in1, CPOperand in2, CPOperand in3, CPOperand out) throws DMLRuntimeException {
		String[] parts = InstructionUtils.getInstructionPartsWithValueType(instr);
		
		// first part is the opcode, last part is the output, middle parts are input operands
		String opcode = parts[0];
		out.split(parts[parts.length-1]);
		
		switch(parts.length) {
		case 3:
			in1.split(parts[1]);
			in2 = null;
			in3 = null;
			break;
		case 4:
			in1.split(parts[1]);
			in2.split(parts[2]);
			in3 = null;
			break;
		case 5:
			in1.split(parts[1]);
			in2.split(parts[2]);
			in3.split(parts[3]);
			break;
		default:
			throw new DMLRuntimeException("Unexpected number of operands in the instruction: " + instr);
		}
		return opcode;
	}
	
	static SimpleOperator getSimpleUnaryOperator(String opcode)
			throws DMLRuntimeException {
		if (opcode.equalsIgnoreCase("!"))
			return new SimpleOperator(Not.getNotFnObject());

		throw new DMLRuntimeException("Unknown unary operator " + opcode);
	}
}