/**
 * 
 */
package bargainingchips.utilityfunctions;

import bargainingchips.Bundle;
import bargainingchips.BundleBuilder;
import bargainingchips.Chip;
import bargainingchips.ChipIssueValue;
import bargainingchips.ChipIssueValueBuilder;
import bargainingchips.wishlist.WishList;
import bargainingchips.wishlist.WishListBuilder;

/**
 * This utility function evaluates the utility of an offer based on its separate utilities regarding the ratio of its total price {@link UF_LessPrice}
 * with respect to the break even prices as well as the total deviation of the chips quantities {@link UF_CloseToQuantity} by considering the importance of price vs. quantity.
 * 
 * To this end, this function adapts the `Intensification' concept in Fuzzy logic [1] depending the value (below or above 0.5) of the above mentioned separate utilities.
 * The values below 0.5 are more decreased (using 2*value^2); however, the values above 0.5 are more increased (using 1-2*(1-value)^2). 
 * 
 * And, if price is more important than quantity, but the price utility has been below 0.5, then the respected total utility would also be decreased; otherwise, it would be increased. 
 * The similar scenario would hold for the quantity. 
 *  
 * 
 * [1] Lotfi-Ali Asgar-Zadeh, Fuzzy sets, Information and control 8 (3), 338-353 (1965).
 * 
 * 
 * @author Faria Nassiri-Mofakham
 *
 */
public class UF_IntensifiedLessPriceCloseToQuantity implements UtilityFunction {

	private WishList wishlist;
	private ChipIssueValue<Double> breakEvenPrices;
	private boolean priceVSquantity; 				// true, if `less price' is more important; 
													// false, if `close to quantity' is important. 


	public UF_IntensifiedLessPriceCloseToQuantity(WishList w, ChipIssueValue<Double> bEP, boolean pVSq)
	{
		this.wishlist = w;
		this.breakEvenPrices = bEP;	
		this.priceVSquantity = pVSq;
	}


	@Override
	public Double getUtility(Bundle b) 
	{
		int totalDeviationQ = 0;
		double desiredP=0.0;
		for (Chip c : wishlist)
		{
			int desiredQ = wishlist.getQuantity(c);
			Integer offeredQ = b.getQuantity(c);
			if (offeredQ == null)
				offeredQ = 0;

			int deviationOfferedQ = Math.abs(desiredQ - offeredQ);
			totalDeviationQ += deviationOfferedQ;

			desiredP += ((c!=null) ? breakEvenPrices.getUnitValue(c) : 0.0);
		}
		double offeredP = ((b!=null) ? b.getTotalPrice() : 0.0);
		if (offeredP > desiredP)
		{
			//System.out.println("offeredPrice "+ offeredP + " > desiredPrice "+ desiredP);
			return 0.0;
		}
		double uP = 1.0 - offeredP/desiredP;
		double uQ = 1.0 / (1 + totalDeviationQ);

		//System.out.println("uP "+uP+"\n"+"uQ "+uQ);

		double u = (
				priceVSquantity ? 
						( (uP < 0.5) ? 
								( (uQ < 0.5) ? 
										Math.pow(2*Math.pow(uP, 2), 1-uQ) 
										: 
											Math.pow(1-2*Math.pow(1-uP, 2), uQ)
										)
								: 
									Math.pow(1-2*Math.pow(1-uP, 2), 1-uQ)
								)							
						:
							( (uQ < 0.5) ? 
									( (uP < 0.5) ? 
											Math.pow(2*Math.pow(uQ, 2), 1-uP) 
											:  
												Math.pow(1-2*Math.pow(1-uQ, 2), uP) 
											)
									:
										Math.pow(1-2*Math.pow(1-uQ, 2), 1-uP)
									)
				);
		return (Double.isNaN(u) ? 0.0 : u);
	}

	@Override
	public String toString()
	{
		return this.getClass().getSimpleName() + ": WishList " + wishlist.toString() + ": BreakEvenPrices "+ breakEvenPrices.toString()+ ": Price Vs. Quantity "+ (priceVSquantity? " `Price'" : " `Quantity'");
	}

	public static void main(String[] args) 
	{
		//boolean pq=true;

		WishList wishlist1 = new WishListBuilder().addWish("Red", 7).addWish("Green", 5).build();
		ChipIssueValue<Double> prices1 = new ChipIssueValueBuilder<Double>().addIssue("Red", 100.0).addIssue("Green", 200.0).addIssue("Blue", 700.0).build();

		UF_IntensifiedLessPriceCloseToQuantity u11 = new UF_IntensifiedLessPriceCloseToQuantity(wishlist1, prices1, true);
		UF_IntensifiedLessPriceCloseToQuantity u12 = new UF_IntensifiedLessPriceCloseToQuantity(wishlist1, prices1, false);



		WishList wishlist2 = new WishListBuilder().addWish("Red", 7).addWish("Green", 5).build();
		ChipIssueValue<Double> prices2 = new ChipIssueValueBuilder<Double>().addIssue("Red", 10.0).addIssue("Green", 20.0).addIssue("Blue", 70.0).build();

		UF_IntensifiedLessPriceCloseToQuantity u21 = new UF_IntensifiedLessPriceCloseToQuantity(wishlist2, prices2, true);
		UF_IntensifiedLessPriceCloseToQuantity u22 = new UF_IntensifiedLessPriceCloseToQuantity(wishlist2, prices2, false);



		WishList wishlist3 = new WishListBuilder().addWish("Green", 4).addWish("Yellow", 6).addWish("Orange", 40).build();
		ChipIssueValue<Double> prices3 = new ChipIssueValueBuilder<Double>().addIssue("Green", 3.0).addIssue("Yellow", 5.0).addIssue("Orange", 1.0).build();

		UF_IntensifiedLessPriceCloseToQuantity u31 = new UF_IntensifiedLessPriceCloseToQuantity(wishlist3, prices3, true);
		UF_IntensifiedLessPriceCloseToQuantity u32 = new UF_IntensifiedLessPriceCloseToQuantity(wishlist3, prices3, false);



		Bundle offer1 = new BundleBuilder()
				.addStack("Red", 1.0, 6)
				.addStack("Green", 3.0, 15)
				.addStack("Purple", 0.10, 10)
				.build();

		Bundle offer2 = new BundleBuilder()
				.addStack("Red", 1.0, 1)
				.addStack("Green", 3.0, 1)
				.addStack("Purple", 0.10, 1)			
				.build();	

		Bundle offer3 = new BundleBuilder()		
				//				.addStack("Green", 2.0, 3)
				//				.addStack("Yellow", 5.0, 4)
				//				.addStack("Orange", 1.0, 17)
				//---				
				.addStack("Green", 3.0, 4)		
				.addStack("Yellow", 5.0, 6)
				.addStack("Orange", 1.0, 40)
				//---				
				//				.addStack("Green", 10.0, 1)		
				//				.addStack("Yellow", 10.0, 1)
				//				.addStack("Orange", 10.0, 1)
				.build();

		System.out.println("\nu11 : "+u11 +"\nOffer1 = "+offer1);
		System.out.println("=> "+u11.getUtility(offer1));	
		System.out.println("\nu11 : "+u11 +"\nOffer2 = "+offer2);
		System.out.println("=> "+u11.getUtility(offer2));
		System.out.println("\nu11 : "+u11 +"\nOffer3 = "+offer3);
		System.out.println("=> "+u11.getUtility(offer3));
		System.out.println("\nu12 : "+u12 +"\nOffer1 = "+offer1);
		System.out.println("=> "+u12.getUtility(offer1));	
		System.out.println("\nu12 : "+u12 +"\nOffer2 = "+offer2);
		System.out.println("=> "+u12.getUtility(offer2));
		System.out.println("\nu12 : "+u12 +"\nOffer3 = "+offer3);
		System.out.println("=> "+u12.getUtility(offer3));

		System.out.println("\nu21 : "+u21 +"\nOffer1 = "+offer1);
		System.out.println("=> "+u21.getUtility(offer1));
		System.out.println("\nu21 : "+u21 +"\nOffer2 = "+offer2);
		System.out.println("=> "+u21.getUtility(offer2));
		System.out.println("\nu21 : "+u21 +"\nOffer3 = "+offer3);
		System.out.println("=> "+u21.getUtility(offer3));
		System.out.println("\nu22 : "+u22 +"\nOffer1 = "+offer1);
		System.out.println("=> "+u22.getUtility(offer1));
		System.out.println("\nu22 : "+u22 +"\nOffer2 = "+offer2);
		System.out.println("=> "+u22.getUtility(offer2));
		System.out.println("\nu22 : "+u22 +"\nOffer3 = "+offer3);
		System.out.println("=> "+u22.getUtility(offer3));

		System.out.println("\nu31 : "+u31 +"\nOffer1 = "+offer1);
		System.out.println("=> "+u31.getUtility(offer1));
		System.out.println("\nu31 : "+u31 +"\nOffer2 = "+offer2);
		System.out.println("=> "+u31.getUtility(offer2));
		System.out.println("\nu31 : "+u31 +"\nOffer3 = "+offer3);
		System.out.println("=> "+u31.getUtility(offer3));	
		System.out.println("\nu32 : "+u32 +"\nOffer1 = "+offer1);
		System.out.println("=> "+u32.getUtility(offer1));
		System.out.println("\nu32 : "+u32 +"\nOffer2 = "+offer2);
		System.out.println("=> "+u32.getUtility(offer2));
		System.out.println("\nu32 : "+u32 +"\nOffer3 = "+offer3);
		System.out.println("=> "+u32.getUtility(offer3));		

	}

}