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/*******************************************************************
 * © 2020 SAP SE or an SAP affiliate company. All rights reserved. *
 *******************************************************************/
package com.sap.cds;

import static java.util.Collections.unmodifiableList;

import java.io.Serial;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import com.sap.cds.ql.CdsDataException;
import com.sap.cds.reflect.CdsElement;

/**
 * Thrown to indicate that a NOT NULL constraint has been violated
 * during an attempt to insert or update a CdsEntity.
 */
public class NotNullConstraintException extends CdsDataException {
	@Serial
	private static final long serialVersionUID = 1L;

	private final transient List nonNullableElements;

	public NotNullConstraintException(List nonNullableElements, Exception ex) {
		super("Constraint violated: %s must not be NULL.".formatted(stringify(nonNullableElements)), ex);
		this.nonNullableElements = unmodifiableList(nonNullableElements);
	}

	/**
	 * Get list of qualified element names which should not be null
	 * 
	 * @return list of qualified element names
	 */
	public List getElementNames() {
		return names(nonNullableElements).collect(Collectors.toList());
	}

	/**
	 * Get the qualified name of the entity
	 * 
	 * @return qualified name of the entity
	 */
	public String getEntityName() {
		return nonNullableElements.get(0).getDeclaringType().getQualifiedName();
	}

	private static String stringify(List nonNullableElements) {
		return names(nonNullableElements).map(e -> "'" + e + "'").collect(Collectors.joining(", "));
	}

	private static Stream names(List nonNullableElements) {
		return nonNullableElements.stream().map(CdsElement::getQualifiedName);
	}
}