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/*
 * Copyright 2017-2021 original authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.micronaut.data.model.jpa.criteria;

import io.micronaut.core.annotation.Experimental;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.data.model.Association;
import io.micronaut.data.model.PersistentProperty;
import io.micronaut.data.model.jpa.criteria.impl.expression.ClassExpressionType;
import io.micronaut.data.model.jpa.criteria.impl.predicate.UnaryPredicate;
import io.micronaut.data.model.jpa.criteria.impl.predicate.PredicateUnaryOp;
import jakarta.persistence.criteria.Path;
import jakarta.persistence.criteria.Predicate;

import java.util.List;
import java.util.StringJoiner;

/**
 * The persistent property {@link Path}.
 *
 * @param  The path type
 * @author Denis Stepanov
 * @since 3.2
 */
@Experimental
public interface PersistentPropertyPath extends Path, IExpression {

    @NonNull
    PersistentProperty getProperty();

    @NonNull
    List getAssociations();

    default io.micronaut.data.model.PersistentPropertyPath getPropertyPath() {
        return new io.micronaut.data.model.PersistentPropertyPath(getAssociations(), getProperty());
    }

    @NonNull
    default String getPathAsString() {
        StringJoiner joiner = new StringJoiner(".");
        for (Association association : getAssociations()) {
            joiner.add(association.getName());
        }
        joiner.add(getProperty().getName());
        return joiner.toString();
    }

    @Override
    default ExpressionType getExpressionType() {
        return (ExpressionType) new ClassExpressionType<>(getJavaType());
    }

    @Override
    default Predicate isNull() {
        return new UnaryPredicate(this, PredicateUnaryOp.IS_NULL);
    }

    @Override
    default Predicate isNotNull() {
        return new UnaryPredicate(this, PredicateUnaryOp.IS_NON_NULL);
    }

}