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package cdm.event.common.functions;

import cdm.base.datetime.AdjustableOrRelativeDate;
import cdm.base.math.QuantityChangeDirectionEnum;
import cdm.base.staticdata.identifier.Identifier;
import cdm.event.common.CollateralPortfolio;
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 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_SubstitutionPrimitiveInstruction.Create_SubstitutionPrimitiveInstructionDefault.class)
public abstract class Create_SubstitutionPrimitiveInstruction implements RosettaFunction {
	
	@Inject protected ConditionValidator conditionValidator;
	
	@Inject protected ModelObjectValidator objectValidator;
	
	// RosettaFunction dependencies
	//
	@Inject protected Create_SubstitutionInstruction create_SubstitutionInstruction;

	/**
	* @param tradeState The original trade to be for substitution of collateral.
	* @param effectiveDate The date to close and open a new trade with new collateral.
	* @param newCollateralPortfolio New collateral portfolio to subtitute for the original collateral.
	* @param priceQuantity The price and quantity of the substituted product.
	* @return instruction 
	*/
	public PrimitiveInstruction evaluate(TradeState tradeState, AdjustableOrRelativeDate effectiveDate, CollateralPortfolio newCollateralPortfolio, List priceQuantity) {
		// 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())), 
				"Only a security finance contractual product can substitute collateral.");
		
		PrimitiveInstruction.PrimitiveInstructionBuilder instructionBuilder = doEvaluate(tradeState, effectiveDate, newCollateralPortfolio, priceQuantity);
		
		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, AdjustableOrRelativeDate effectiveDate, CollateralPortfolio newCollateralPortfolio, List priceQuantity);

	public static class Create_SubstitutionPrimitiveInstructionDefault extends Create_SubstitutionPrimitiveInstruction {
		@Override
		protected PrimitiveInstruction.PrimitiveInstructionBuilder doEvaluate(TradeState tradeState, AdjustableOrRelativeDate effectiveDate, CollateralPortfolio newCollateralPortfolio, List priceQuantity) {
			PrimitiveInstruction.PrimitiveInstructionBuilder instruction = PrimitiveInstruction.builder();
			return assignOutput(instruction, tradeState, effectiveDate, newCollateralPortfolio, priceQuantity);
		}
		
		protected PrimitiveInstruction.PrimitiveInstructionBuilder assignOutput(PrimitiveInstruction.PrimitiveInstructionBuilder instruction, TradeState tradeState, AdjustableOrRelativeDate effectiveDate, CollateralPortfolio newCollateralPortfolio, List priceQuantity) {
			instruction = toBuilder(MapperS.of(PrimitiveInstruction.builder()
				.setQuantityChange(MapperS.of(QuantityChangeInstruction.builder()
					.setChange(MapperC.of(priceQuantity).getMulti())
					.setDirection(MapperS.of(QuantityChangeDirectionEnum.REPLACE).get())
					.setLotIdentifier(MapperC.ofNull().getMulti())
					.build())
				.get())
				.setTermsChange(MapperS.of(create_SubstitutionInstruction.evaluate(MapperS.of(tradeState).map("getTrade", _tradeState -> _tradeState.getTrade()).map("getTradableProduct", trade -> trade.getTradableProduct()).map("getProduct", tradableProduct -> tradableProduct.getProduct()).map("getContractualProduct", product -> product.getContractualProduct()).get(), MapperS.of(effectiveDate).get(), MapperS.of(newCollateralPortfolio).get())).get())
				.build())
			.get());
			
			return Optional.ofNullable(instruction)
				.map(o -> o.prune())
				.orElse(null);
		}
	}
}