/*
 * 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.controlprogram.context.ExecutionContext;
import org.apache.sysml.runtime.instructions.InstructionUtils;
import org.apache.sysml.runtime.matrix.data.MatrixBlock;
import org.apache.sysml.runtime.matrix.operators.Operator;

public class PMMJCPInstruction extends ComputationCPInstruction
{	
	
	private int _numThreads = -1;
	
	public PMMJCPInstruction(Operator op, CPOperand in1, CPOperand in2, CPOperand in3, CPOperand out, int k, String opcode, String istr)
	{
		super(op, in1, in2, in3, out, opcode, istr);
		_numThreads = k;
	}

	public static PMMJCPInstruction parseInstruction ( String str ) 
		throws DMLRuntimeException 
	{
		String[] parts = InstructionUtils.getInstructionPartsWithValueType(str);
		InstructionUtils.checkNumFields ( parts, 5 );
		
		String opcode = parts[0];
		CPOperand in1 = new CPOperand(parts[1]);
		CPOperand in2 = new CPOperand(parts[2]);
		CPOperand in3 = new CPOperand(parts[3]);
		CPOperand out = new CPOperand(parts[4]);
		int k = Integer.parseInt(parts[5]);
		
		if(!opcode.equalsIgnoreCase("pmm"))
			throw new DMLRuntimeException("Unknown opcode while parsing an PMMJCPInstruction: " + str);
		else
			return new PMMJCPInstruction(new Operator(true), in1, in2, in3, out, k, opcode, str);
	}
	
	@Override
	public void processInstruction(ExecutionContext ec)
		throws DMLRuntimeException 
	{
		//get inputs
		MatrixBlock matBlock1 = ec.getMatrixInput(input1.getName());
		MatrixBlock matBlock2 = ec.getMatrixInput(input2.getName());
		int rlen = (int)ec.getScalarInput(input3.getName(), input3.getValueType(), input3.isLiteral()).getLongValue();
		
		//execute operations
		MatrixBlock ret = new MatrixBlock(rlen, matBlock2.getNumColumns(), matBlock2.isInSparseFormat());
		matBlock1.permutationMatrixMultOperations(matBlock2, ret, null, _numThreads);
		
		//set output and release inputs
		ec.setMatrixOutput(output.getName(), ret);
		ec.releaseMatrixInput(input1.getName());
		ec.releaseMatrixInput(input2.getName());
	}
}