/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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 org.grails.datastore.bson.codecs.decoders

import groovy.transform.CompileStatic

import org.bson.BsonReader
import org.bson.codecs.DecoderContext
import org.bson.codecs.configuration.CodecRegistry

import org.grails.datastore.bson.codecs.BsonPersistentEntityCodec
import org.grails.datastore.bson.codecs.PropertyDecoder
import org.grails.datastore.mapping.dirty.checking.DirtyCheckable
import org.grails.datastore.mapping.engine.EntityAccess
import org.grails.datastore.mapping.model.PersistentEntity
import org.grails.datastore.mapping.model.types.Association
import org.grails.datastore.mapping.model.types.Embedded
import org.grails.datastore.mapping.reflect.EntityReflector

/**
 * A {@PropertyDecoder} capable of decoding {@Embedded} association types
 */
@CompileStatic
class EmbeddedDecoder implements PropertyDecoder<Embedded> {

    @Override
    void decode(BsonReader reader, Embedded property, EntityAccess entityAccess, DecoderContext decoderContext, CodecRegistry codecRegistry) {
        def associatedEntity = property.associatedEntity
        BsonPersistentEntityCodec codec = createEmbeddedEntityCodec(codecRegistry, associatedEntity)

        def decoded = codec.decode(reader, decoderContext)
        if (decoded instanceof DirtyCheckable) {
            decoded.trackChanges()
        }

        if (property.isBidirectional()) {
            Association inverseSide = property.getInverseSide()
            EntityReflector associationReflector = property.getAssociatedEntity().getReflector()
            associationReflector.setProperty(
                    decoded,
                    inverseSide.name,
                    entityAccess.entity
            )
        }

        entityAccess.setPropertyNoConversion(
                property.name,
                decoded
        )

    }

    protected BsonPersistentEntityCodec createEmbeddedEntityCodec(CodecRegistry codecRegistry, PersistentEntity associatedEntity) {
        new BsonPersistentEntityCodec(codecRegistry, associatedEntity)
    }
}
