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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * 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.
 */
package io.gravitee.rest.api.service.impl;

import com.fasterxml.jackson.databind.ObjectMapper;
import io.gravitee.rest.api.model.descriptor.GraviteeDescriptorEntity;
import io.gravitee.rest.api.service.GraviteeDescriptorService;
import io.gravitee.rest.api.service.exceptions.GraviteeDescriptorReadException;
import io.gravitee.rest.api.service.exceptions.GraviteeDescriptorVersionException;
import java.io.IOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

/**
 * @author Nicolas GERAUD (nicolas.geraud at graviteesource.com)
 * @author GraviteeSource Team
 */
@Component
public class GraviteeDescriptorServiceImpl extends TransactionalService implements GraviteeDescriptorService {

    private static final String DESCRIPTOR_FILENAME = ".gravitee.json";

    private static final Logger logger = LoggerFactory.getLogger(GraviteeDescriptorServiceImpl.class);

    @Override
    public String descriptorName() {
        return DESCRIPTOR_FILENAME;
    }

    @Override
    public GraviteeDescriptorEntity read(String s) {
        ObjectMapper mapper = new ObjectMapper();
        try {
            GraviteeDescriptorEntity descriptorEntity = mapper.readValue(s, GraviteeDescriptorEntity.class);
            assertVersion(descriptorEntity);
            return descriptorEntity;
        } catch (IOException e) {
            logger.error("An error occurs while trying to read the descriptor", e);
            throw new GraviteeDescriptorReadException("An error occurs while trying to read the descriptor");
        }
    }

    private void assertVersion(GraviteeDescriptorEntity descriptorEntity) {
        if (1 != descriptorEntity.getVersion()) {
            throw new GraviteeDescriptorVersionException(descriptorEntity.getVersion());
        }
    }
}