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/*
 * DISCLAIMER
 *
 * Copyright 2016 ArangoDB GmbH, Cologne, Germany
 *
 * 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
 *
 *     http://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.
 *
 * Copyright holder is ArangoDB GmbH, Cologne, Germany
 */

package com.arangodb.internal.util;

import com.arangodb.ArangoDBException;
import com.arangodb.util.ArangoSerializer;
import com.arangodb.velocypack.VPack;
import com.arangodb.velocypack.VPack.SerializeOptions;
import com.arangodb.velocypack.VPackParser;
import com.arangodb.velocypack.VPackSlice;
import com.arangodb.velocypack.exception.VPackException;

import java.util.Iterator;

/**
 * @author Mark Vollmary
 */
public class ArangoSerializerImpl implements ArangoSerializer {

    private final VPack vpacker;
    private final VPack vpackerNull;
    private final VPackParser vpackParser;

    public ArangoSerializerImpl(final VPack vpacker, final VPack vpackerNull, final VPackParser vpackParser) {
        super();
        this.vpacker = vpacker;
        this.vpackerNull = vpackerNull;
        this.vpackParser = vpackParser;
    }

    @Override
    public VPackSlice serialize(final Object entity) throws ArangoDBException {
        return serialize(entity, new ArangoSerializer.Options());
    }

    @SuppressWarnings("unchecked")
    @Override
    public VPackSlice serialize(final Object entity, final Options options) throws ArangoDBException {
        if (options.getType() == null) {
            options.type(entity.getClass());
        }
        try {
            final VPackSlice vpack;
            final Class type = entity.getClass();
            final boolean serializeNullValues = options.isSerializeNullValues();
            if (String.class.isAssignableFrom(type)) {
                vpack = vpackParser.fromJson((String) entity, serializeNullValues);
            } else if (options.isStringAsJson() && Iterable.class.isAssignableFrom(type)) {
                final Iterator iterator = ((Iterable) entity).iterator();
                if (iterator.hasNext() && String.class.isAssignableFrom(iterator.next().getClass())) {
                    vpack = vpackParser.fromJson((Iterable) entity, serializeNullValues);
                } else {
                    final VPack vp = serializeNullValues ? vpackerNull : vpacker;
                    vpack = vp.serialize(entity,
                            new SerializeOptions().type(options.getType()).additionalFields(options.getAdditionalFields()));
                }
            } else {
                final VPack vp = serializeNullValues ? vpackerNull : vpacker;
                vpack = vp.serialize(entity,
                        new SerializeOptions().type(options.getType()).additionalFields(options.getAdditionalFields()));
            }
            return vpack;
        } catch (final VPackException e) {
            throw new ArangoDBException(e);
        }
    }

}