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/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.validation.impl.validators;

import org.openecomp.core.utilities.yaml.YamlUtil;
import org.openecomp.sdc.validation.Validator;
import org.openecomp.core.validation.errors.ErrorMessagesFormatBuilder;
import org.openecomp.core.validation.types.GlobalValidationContext;
import org.openecomp.sdc.common.errors.Messages;
import org.openecomp.sdc.datatypes.error.ErrorLevel;
import org.openecomp.sdc.logging.api.Logger;
import org.openecomp.sdc.logging.api.LoggerFactory;
import org.openecomp.sdc.logging.context.impl.MdcDataDebugMessage;
import org.openecomp.sdc.logging.types.LoggerErrorDescription;
import org.openecomp.sdc.logging.types.LoggerTragetServiceName;
import org.openecomp.sdc.validation.impl.util.YamlValidatorUtil;

import java.io.InputStream;
import java.util.Collection;
import java.util.Map;
import java.util.Optional;

public class YamlValidator implements Validator {
  public static MdcDataDebugMessage mdcDataDebugMessage = new MdcDataDebugMessage();
  private static final Logger logger = (Logger) LoggerFactory.getLogger(YamlValidator.class);

  @Override
  public void validate(GlobalValidationContext globalContext) {
    mdcDataDebugMessage.debugEntryMessage(null, null);

    Collection<String> files = globalContext.files(
        (fileName, globalValidationContext) -> (fileName.endsWith(".yaml")
            || fileName.endsWith(".yml") || fileName.endsWith(".env")));

    files.stream().forEach(fileName -> validate(fileName, globalContext));

    mdcDataDebugMessage.debugExitMessage(null, null);
  }

  private void validate(String fileName, GlobalValidationContext globalContext) {
    Optional<InputStream> rowContent = globalContext.getFileContent(fileName);
    if (!rowContent.isPresent()) {
      globalContext.addMessage(fileName, ErrorLevel.ERROR, ErrorMessagesFormatBuilder
              .getErrorWithParameters(Messages.INVALID_YAML_FORMAT_REASON.getErrorMessage(),
                  Messages.EMPTY_YAML_FILE.getErrorMessage()),
          LoggerTragetServiceName.VALIDATE_YAML_CONTENT,
          LoggerErrorDescription.INVALID_YAML_FORMAT);
      return; /* no need to continue validation */
    }

    try {
      convert(rowContent.get(), Map.class);
    } catch (Exception exception) {

      globalContext.addMessage(fileName, ErrorLevel.ERROR, ErrorMessagesFormatBuilder
              .getErrorWithParameters(Messages.INVALID_YAML_FORMAT_REASON.getErrorMessage(),
                  YamlValidatorUtil.getParserExceptionReason(exception)),
          LoggerTragetServiceName.VALIDATE_YAML_CONTENT,
          LoggerErrorDescription.INVALID_YAML_FORMAT);
    }
  }

  private <T> T convert(InputStream content, Class<T> type) {
    return new YamlUtil().yamlToObject(content, type);
  }
}