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

import java.io.Serial;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

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

/**
 * Thrown by the data store, if a unique constraint is violated when executing
 * an insert, upsert or update statement.
 */
public class UniqueConstraintException extends CdsDataException {
	@Serial
	private static final long serialVersionUID = 1L;

	private final transient CdsEntity entity;
	private final transient Map elementValues;

	public UniqueConstraintException(CdsEntity entity, Map elementValues, Set keys,
			Exception ex) {
		super("Unique constraint violated when inserting or updating '%s[%s]'".formatted(entity.getQualifiedName(),
				stringify(elementValues, keys)), ex);
		this.entity = entity;
		this.elementValues = elementValues;
	}

	/**
	 * Get entity qualified name
	 * 
	 * @return entity qualified name
	 */
	public String getEntityName() {
		return entity.getQualifiedName();
	}

	/**
	 * Get map of element names and values violating the unique constraint
	 * 
	 * @return map of element names and values
	 */
	public Map getElementValues() {
		return elementValues;
	}

	private static String stringify(Map values, Set keys) {
		return values.entrySet().stream().map(k -> k.getKey() + (keys.contains(k.getKey()) ? "=" + k.getValue() : ""))
				.collect(Collectors.joining(", "));
	}

}