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/*********************************************************************
 * (C) 2020 SAP SE or an SAP affiliate company. All rights reserved. *
 *********************************************************************/
package com.sap.cds.reflect.impl;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;

import com.sap.cds.reflect.CdsAction;
import com.sap.cds.reflect.CdsAnnotation;
import com.sap.cds.reflect.CdsParameter;
import com.sap.cds.reflect.CdsType;

public class CdsActionBuilder extends CdsDefinitionBuilder {

	private final List parameters = new ArrayList<>(); // ordered

	private CdsTypeBuilder returnType = null; // optional

	private CdsActionImpl impl = null;

	public CdsActionBuilder(List> annotations, String qualifiedName) {
		super(annotations, qualifiedName);
	}

	@Override
	public CdsAction build() {
		if (impl == null) {
			impl = new CdsActionImpl(annotations, qualifiedName);
			parameters.stream().filter(pb -> !pb.toBeIgnored(qualifiedName + "." + pb.getName()))
					.forEach(p -> impl.parameters.add(p.build()));
			if (returnType != null) {
				impl.returnType = this.returnType.build();
			}
		}
		return impl;
	}

	void addParameter(CdsParameterBuilder p) {
		this.parameters.add(p);
	}

	void addParameters(List params) {
		params.forEach(this::addParameter);
	}

	void setReturnType(CdsTypeBuilder returnType) {
		this.returnType = returnType;
	}

	private static class CdsActionImpl extends CdsDefinitionImpl implements CdsAction {

		private final List parameters = new ArrayList<>(); // ordered

		private CdsType returnType; // optional

		private CdsActionImpl(Collection> annotations, String qualifiedName) {
			super(annotations, qualifiedName);
		}

		@Override
		public Stream parameters() {
			return parameters.stream();
		}

		@Override
		public Optional returnType() {
			return Optional.ofNullable(returnType);
		}

	}
}