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package cdm.event.common.functions;

import cdm.base.math.QuantityChangeDirectionEnum;
import cdm.base.staticdata.identifier.Identifier;
import cdm.event.common.PrimitiveInstruction;
import cdm.event.common.PrimitiveInstruction.PrimitiveInstructionBuilder;
import cdm.event.common.QuantityChangeInstruction;
import cdm.event.common.Trade;
import cdm.event.common.TradeState;
import cdm.product.common.settlement.PriceQuantity;
import cdm.product.template.ContractualProduct;
import cdm.product.template.Product;
import cdm.product.template.TradableProduct;
import cdm.product.template.TradeLot;
import com.google.inject.ImplementedBy;
import com.rosetta.model.lib.functions.ConditionValidator;
import com.rosetta.model.lib.functions.ModelObjectValidator;
import com.rosetta.model.lib.functions.RosettaFunction;
import com.rosetta.model.lib.mapper.MapperC;
import com.rosetta.model.lib.mapper.MapperS;
import java.util.List;
import java.util.Optional;
import javax.inject.Inject;

import static com.rosetta.model.lib.expression.ExpressionOperators.*;

@ImplementedBy(Create_PartialDeliveryPrimitiveInstruction.Create_PartialDeliveryPrimitiveInstructionDefault.class)
public abstract class Create_PartialDeliveryPrimitiveInstruction implements RosettaFunction {
	
	@Inject protected ConditionValidator conditionValidator;
	
	@Inject protected ModelObjectValidator objectValidator;
	
	// RosettaFunction dependencies
	//
	@Inject protected Create_TerminationInstruction create_TerminationInstruction;

	/**
	* @param tradeState The original trade to be closed.
	* @param deliveredPriceQuantity The price and quantity of the delivered amount.
	* @return instruction 
	*/
	public PrimitiveInstruction evaluate(TradeState tradeState, List deliveredPriceQuantity) {
		// pre-conditions
		conditionValidator.validate(() -> 
			exists(MapperS.of(tradeState).map("getTrade", _tradeState -> _tradeState.getTrade()).map("getTradableProduct", trade -> trade.getTradableProduct()).map("getProduct", tradableProduct -> tradableProduct.getProduct()).map("getContractualProduct", product -> product.getContractualProduct())), 
				"This function applies to contractual products only.");
		
		PrimitiveInstruction.PrimitiveInstructionBuilder instructionBuilder = doEvaluate(tradeState, deliveredPriceQuantity);
		
		final PrimitiveInstruction instruction;
		if (instructionBuilder == null) {
			instruction = null;
		} else {
			instruction = instructionBuilder.build();
			objectValidator.validate(PrimitiveInstruction.class, instruction);
		}
		
		return instruction;
	}

	protected abstract PrimitiveInstruction.PrimitiveInstructionBuilder doEvaluate(TradeState tradeState, List deliveredPriceQuantity);

	public static class Create_PartialDeliveryPrimitiveInstructionDefault extends Create_PartialDeliveryPrimitiveInstruction {
		@Override
		protected PrimitiveInstruction.PrimitiveInstructionBuilder doEvaluate(TradeState tradeState, List deliveredPriceQuantity) {
			PrimitiveInstruction.PrimitiveInstructionBuilder instruction = PrimitiveInstruction.builder();
			return assignOutput(instruction, tradeState, deliveredPriceQuantity);
		}
		
		protected PrimitiveInstruction.PrimitiveInstructionBuilder assignOutput(PrimitiveInstruction.PrimitiveInstructionBuilder instruction, TradeState tradeState, List deliveredPriceQuantity) {
			instruction
				.getOrCreateSplit()
				.setBreakdown(MapperC.of(MapperS.of(create_TerminationInstruction.evaluate(MapperS.of(tradeState).get()))).getMulti());
			
			instruction
				.getOrCreateSplit()
				.setBreakdown(MapperC.of(MapperS.of(PrimitiveInstruction.builder()
					.setQuantityChange(MapperS.of(QuantityChangeInstruction.builder()
						.setChange(MapperC.of(deliveredPriceQuantity).getMulti())
						.setDirection(MapperS.of(QuantityChangeDirectionEnum.REPLACE).get())
						.setLotIdentifier(MapperS.of(tradeState).map("getTrade", _tradeState -> _tradeState.getTrade()).map("getTradableProduct", trade -> trade.getTradableProduct()).mapC("getTradeLot", tradableProduct -> tradableProduct.getTradeLot()).mapC("getLotIdentifier", tradeLot -> tradeLot.getLotIdentifier()).getMulti())
						.build())
					.get())
					.build())
				).getMulti());
			
			return Optional.ofNullable(instruction)
				.map(o -> o.prune())
				.orElse(null);
		}
	}
}