package logic;

import java.util.ArrayList;

import data.DerivativeType;
import data.RawMaterial;


/**
 * class to build raw materials
 * 
 * @author Rukmal Fernando
 * @author Hardik Kotecha
 * @author Radhika Srinivasan
 */
public class Builder
{
	private RawMaterial generatedRawMaterial;
	
	/**
	 * default constructor
	 * *Not yet implemented*
	 * 
	 * @exception RuntimeException
	 */
	public Builder()
	{
		throw new RuntimeException( "Unable to instantiate default Builder." );
	}
	
	/**
	 * constructor
	 * 
	 * @param pRawMaterialType : the type of the raw material to be built
	 */
	public Builder( DerivativeType pRawMaterialType )
	{
		throw new RuntimeException("Builder(DerivativeType) is not implemented!");
	}
	
	/**
	 * Find all the subsets of variables of a certain length
	 * 
	 * @param pVariables
	 * @param pLength
	 * @return list of clauses/subsets of length pLength given a set pVariables
	 */
	ArrayList<ArrayList<String>> findAllSubsets( ArrayList<String> pVariables, int pLength )
	{
		//list to store all subsets
		ArrayList<ArrayList<String>> allSubsets = new ArrayList<ArrayList<String>>();
		
		int[] indices;
		CombinationGenerator cg = new CombinationGenerator( pVariables.size(), pLength );
		ArrayList<String> combination;
		
		while ( cg.hasMore() ) 
		{
			combination = new ArrayList<String>();
			indices = cg.getNext();
		  
			for ( int i = 0 ; i < indices.length ; i++ )
			{
				combination.add( pVariables.get( indices[i] ) );
			}
			
			allSubsets.add( combination );
		}
		
		return allSubsets;
	}
	
	/**
	 * get the generated raw material
	 * 
	 * @return RawMaterial
	 */
	public RawMaterial getGeneratedRawMaterial()
	{
		return generatedRawMaterial;
	}

	/**
	 * set the generated raw material
	 * 
	 * @param pGeneratedRawMaterial : RawMaterial
	 */
	private void setGeneratedRawMaterial( RawMaterial pGeneratedRawMaterial )
	{
		generatedRawMaterial = pGeneratedRawMaterial;
	}
}