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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.impl;

import io.micronaut.core.annotation.AnnotationMetadata;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.data.model.PersistentEntity;
import io.micronaut.data.model.jpa.criteria.ExpressionType;
import io.micronaut.data.model.jpa.criteria.IExpression;
import io.micronaut.data.model.jpa.criteria.PersistentEntityCriteriaDelete;
import io.micronaut.data.model.jpa.criteria.PersistentEntityRoot;
import io.micronaut.data.model.jpa.criteria.PersistentEntitySubquery;
import io.micronaut.data.model.jpa.criteria.impl.predicate.ConjunctionPredicate;
import io.micronaut.data.model.jpa.criteria.impl.selection.CompoundSelection;
import io.micronaut.data.model.query.builder.QueryBuilder2;
import io.micronaut.data.model.query.builder.QueryResult;
import jakarta.persistence.criteria.Expression;
import jakarta.persistence.criteria.Predicate;
import jakarta.persistence.criteria.Selection;
import jakarta.persistence.metamodel.EntityType;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Objects;

import static io.micronaut.data.model.jpa.criteria.impl.CriteriaUtils.notSupportedOperation;

/**
 * The abstract implementation of {@link PersistentEntityCriteriaDelete}.
 *
 * @param  The entity type
 * @author Denis Stepanov
 * @since 3.2
 */
@Internal
public abstract class AbstractPersistentEntityCriteriaDelete implements PersistentEntityCriteriaDelete,
    QueryResultPersistentEntityCriteriaQuery {

    protected Predicate predicate;
    protected PersistentEntityRoot entityRoot;
    protected Selection returning;

    @Override
    public QueryResult buildQuery(AnnotationMetadata annotationMetadata, QueryBuilder2 queryBuilder) {
        return queryBuilder.buildDelete(
            annotationMetadata,
            new DeleteQueryDefinitionImpl(entityRoot.getPersistentEntity(), predicate, returning)
        );
    }

    @Override
    public abstract PersistentEntityRoot from(Class entityClass);

    @Override
    public abstract PersistentEntityRoot from(PersistentEntity persistentEntity);

    @Override
    public PersistentEntityRoot from(EntityType entity) {
        throw CriteriaUtils.notSupportedOperation();
    }

    @Override
    public PersistentEntityCriteriaDelete where(Expression restriction) {
        if (restriction instanceof ConjunctionPredicate conjunctionPredicate) {
            predicate = conjunctionPredicate;
        } else {
            predicate = new ConjunctionPredicate(Collections.singleton((IExpression) restriction));
        }
        return this;
    }

    @Override
    public PersistentEntityCriteriaDelete where(Predicate... restrictions) {
        Objects.requireNonNull(restrictions);
        if (restrictions.length > 0) {
            predicate = restrictions.length == 1 ? restrictions[0] : new ConjunctionPredicate(
                Arrays.stream(restrictions).sequential().map(x -> (IExpression) x).toList()
            );
        } else {
            predicate = null;
        }
        return this;
    }

    @Override
    public PersistentEntityRoot getRoot() {
        return entityRoot;
    }

    @Override
    public Predicate getRestriction() {
        return predicate;
    }

    @Override
    public  PersistentEntitySubquery subquery(ExpressionType type) {
        throw notSupportedOperation();
    }

    public final boolean hasVersionRestriction() {
        if (entityRoot.getPersistentEntity().getVersion() == null) {
            return false;
        }
        return CriteriaUtils.hasVersionPredicate(predicate);
    }

    @Override
    public PersistentEntityCriteriaDelete returning(Selection selection) {
        Objects.requireNonNull(selection);
        this.returning = selection;
        return this;
    }

    @Override
    public PersistentEntityCriteriaDelete returningMulti(List> selectionList) {
        Objects.requireNonNull(selectionList);
        if (!selectionList.isEmpty()) {
            this.returning = new CompoundSelection<>(selectionList);
        } else {
            this.returning = null;
        }
        return this;
    }

    @Override
    public PersistentEntityCriteriaDelete returningMulti(@NonNull Selection... selections) {
        Objects.requireNonNull(selections);
        if (selections.length != 0) {
            this.returning = new CompoundSelection<>(List.of(selections));
        } else {
            this.returning = null;
        }
        return this;
    }

    private static final class DeleteQueryDefinitionImpl extends AbstractPersistentEntityCriteriaQuery.BaseQueryDefinitionImpl implements QueryBuilder2.DeleteQueryDefinition {

        private final Selection returningSelection;

        DeleteQueryDefinitionImpl(PersistentEntity persistentEntity, Predicate predicate, Selection returningSelection) {
            super(persistentEntity, predicate, Map.of());
            this.returningSelection = returningSelection;
        }

        @Override
        public Selection returningSelection() {
            return returningSelection;
        }
    }
}