/*
 * Copyright 2012-2023 the original author or 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 org.springframework.data.couchbase.core.convert;

import java.util.Collections;

import org.springframework.data.convert.DefaultTypeMapper;
import org.springframework.data.convert.TypeAliasAccessor;
import org.springframework.data.couchbase.core.mapping.CouchbaseDocument;
import org.springframework.data.mapping.Alias;
import org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.util.TypeInformation;

/**
 * The Couchbase Type Mapper.
 *
 * @author Michael Nitschinger
 * @author Mark Paluch
 * @author Michael Reiche
 */
public class DefaultCouchbaseTypeMapper extends DefaultTypeMapper<CouchbaseDocument> implements CouchbaseTypeMapper {

	/**
	 * The type key to use if a complex type was identified.
	 */
	public static final String DEFAULT_TYPE_KEY = "_class";

	private final String typeKey;

	/**
	 * Create a new type mapper with the type key.
	 *
	 * @param typeKey the typeKey to use.
	 */
	public DefaultCouchbaseTypeMapper(final String typeKey) {
		super(new CouchbaseDocumentTypeAliasAccessor(typeKey), (MappingContext) null,
				Collections.singletonList(new TypeAwareTypeInformationMapper()));
		this.typeKey = typeKey;
	}

	@Override
	public String getTypeKey() {
		return this.typeKey;
	}

	public static final class CouchbaseDocumentTypeAliasAccessor implements TypeAliasAccessor<CouchbaseDocument> {

		private final String typeKey;

		public CouchbaseDocumentTypeAliasAccessor(final String typeKey) {
			this.typeKey = typeKey;
		}

		@Override
		public Alias readAliasFrom(final CouchbaseDocument source) {
            if (typeKey == null || typeKey.length() == 0) {
                return Alias.NONE;
            }
			return Alias.ofNullable(source.get(typeKey));
		}

		@Override
		public void writeTypeTo(final CouchbaseDocument sink, final Object alias) {
			if (typeKey != null) {
				sink.put(typeKey, alias);
			}
		}
	}

	@Override
	public Alias getTypeAlias(TypeInformation<?> info) {
		return getAliasFor(info);
	}
}
