/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * Licensed 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 com.ibm.bi.dml.lops;

import com.ibm.bi.dml.lops.Aggregate.OperationTypes;
import com.ibm.bi.dml.lops.LopProperties.ExecLocation;
import com.ibm.bi.dml.lops.LopProperties.ExecType;
import com.ibm.bi.dml.lops.compile.JobType;
import com.ibm.bi.dml.parser.Expression.*;


/**
 * 
 * 
 */
public class CumulativePartialAggregate extends Lop 
{
	
	private OperationTypes _op;
	
	public CumulativePartialAggregate(Lop input, DataType dt, ValueType vt, OperationTypes op, ExecType et)
		throws LopsException 
	{
		super(Lop.Type.CumulativePartialAggregate, dt, vt);
		
		//sanity check for supported aggregates
		if( !(op == OperationTypes.KahanSum || op == OperationTypes.Product ||
			  op == OperationTypes.Min || op == OperationTypes.Max) )
		{
			throw new LopsException("Unsupported aggregate operation type: "+op);
		}
		_op = op;
		
		init(input, dt, vt, et);
	}
	
	/**
	 * 
	 * @param input
	 * @param dt
	 * @param vt
	 * @param et
	 */
	private void init(Lop input, DataType dt, ValueType vt, ExecType et) 
	{
		this.addInput(input);
		input.addOutput(this);

		if( et == ExecType.MR )
		{
			//setup MR parameters
			boolean breaksAlignment = true;
			boolean aligner = false;
			boolean definesMRJob = false;
			
			lps.addCompatibility(JobType.GMR);
			lps.addCompatibility(JobType.DATAGEN);
			lps.setProperties(inputs, et, ExecLocation.Map, breaksAlignment, aligner, definesMRJob);
		}
		else //Spark/CP
		{
			//setup Spark parameters 
			boolean breaksAlignment = false;
			boolean aligner = false;
			boolean definesMRJob = false;
			lps.addCompatibility(JobType.INVALID);
			lps.setProperties( inputs, et, ExecLocation.ControlProgram, breaksAlignment, aligner, definesMRJob );
		}
	}

	@Override
	public String toString() {
		return "CumulativePartialAggregate";
	}
	
	/**
	 * 
	 * @return
	 */
	private String getOpcode() 
	{
		switch( _op ) {
			case KahanSum: 	return "ucumack+";
			case Product: 	return "ucumac*";
			case Min:		return "ucumacmin";
			case Max: 		return "ucumacmax";
			default: 		return null;
		}
	}
	
	@Override
	public String getInstructions(int input_index, int output_index)
		throws LopsException 
	{
		StringBuilder sb = new StringBuilder();
		sb.append( getExecType() );
		sb.append( OPERAND_DELIMITOR );
		sb.append( getOpcode() );
		sb.append( OPERAND_DELIMITOR );
		sb.append( getInputs().get(0).prepInputOperand(input_index) );
		sb.append( OPERAND_DELIMITOR );
		sb.append( this.prepOutputOperand(output_index) );

		return sb.toString();
	}
	
	@Override
	public String getInstructions(String input, String output)
		throws LopsException 
	{
		StringBuilder sb = new StringBuilder();
		sb.append( getExecType() );
		sb.append( OPERAND_DELIMITOR );
		sb.append( getOpcode() );
		sb.append( OPERAND_DELIMITOR );
		sb.append( getInputs().get(0).prepInputOperand(input) );
		sb.append( OPERAND_DELIMITOR );
		sb.append( this.prepOutputOperand(output) );

		return sb.toString();
	}
}