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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;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import org.apache.commons.collections4.MapUtils;
import org.openecomp.core.utilities.file.FileContentHandler;
import org.openecomp.core.utilities.file.FileUtils;
import org.openecomp.core.validation.api.ValidationManager;
import org.openecomp.sdc.common.errors.CoreException;
import org.openecomp.sdc.common.errors.ErrorCategory;
import org.openecomp.sdc.common.errors.ErrorCode;
import org.openecomp.sdc.common.errors.Messages;
import org.openecomp.sdc.common.utils.SdcCommon;
import org.openecomp.sdc.common.zip.ZipUtils;
import org.openecomp.sdc.common.zip.exception.ZipException;
import org.openecomp.sdc.datatypes.error.ErrorMessage;
import org.openecomp.sdc.heat.datatypes.structure.ValidationStructureList;
import org.openecomp.sdc.heat.services.tree.HeatTreeManager;
import org.openecomp.sdc.heat.services.tree.HeatTreeManagerUtil;
import org.openecomp.sdc.validation.UploadValidationManager;
import org.openecomp.sdc.validation.types.ValidationFileResponse;
import org.openecomp.sdc.validation.util.ValidationManagerUtil;


/**
 * Created by TALIO on 4/20/2016.
 */
public class UploadValidationManagerImpl implements UploadValidationManager {

  private static FileContentHandler getFileContentMapFromZip(byte[] uploadFileData) throws IOException {
    final Map<String, byte[]> zipFileAndByteMap;
    try {
      zipFileAndByteMap = ZipUtils.readZip(uploadFileData, true);
    } catch (final ZipException e) {
      throw new IOException(e);
    }

    final boolean zipHasFolders = zipFileAndByteMap.values().stream().anyMatch(Objects::isNull);
    if (zipHasFolders) {
      throw new CoreException((new ErrorCode.ErrorCodeBuilder())
          .withMessage(Messages.ZIP_SHOULD_NOT_CONTAIN_FOLDERS.getErrorMessage())
          .withId(Messages.ZIP_SHOULD_NOT_CONTAIN_FOLDERS.getErrorMessage())
          .withCategory(ErrorCategory.APPLICATION).build());
    }
    final FileContentHandler mapFileContent = new FileContentHandler();
    zipFileAndByteMap.entrySet().stream()
        .filter(entry -> entry.getValue() != null)
        .forEach(zipEntry -> mapFileContent.addFile(zipEntry.getKey(), zipEntry.getValue()));

    return mapFileContent;
  }

  @Override
  public ValidationFileResponse validateFile(String type, InputStream fileToValidate)
      throws IOException {
    ValidationFileResponse validationFileResponse = new ValidationFileResponse();

    HeatTreeManager tree;
    ValidationStructureList validationStructureList = new ValidationStructureList();
    if (type.equalsIgnoreCase("heat")) {
      FileContentHandler content = getFileContent(fileToValidate);
      if (!content.containsFile(SdcCommon.MANIFEST_NAME)) {
        throw new CoreException((new ErrorCode.ErrorCodeBuilder())
            .withMessage(Messages.MANIFEST_NOT_EXIST.getErrorMessage())
            .withId(Messages.ZIP_SHOULD_NOT_CONTAIN_FOLDERS.getErrorMessage())
            .withCategory(ErrorCategory.APPLICATION).build());
      }
      Map<String, List<ErrorMessage>> errors = validateHeatUploadData(content);
      tree = HeatTreeManagerUtil.initHeatTreeManager(content);
      tree.createTree();

      if (MapUtils.isNotEmpty(errors)) {
        tree.addErrors(errors);
        validationStructureList.setImportStructure(tree.getTree());
      }

    } else {
      throw new RuntimeException("invalid type:" + type);
    }
    validationFileResponse.setValidationData(validationStructureList);
    return validationFileResponse;
  }

  private Map<String, List<ErrorMessage>> validateHeatUploadData(FileContentHandler fileContentMap) {
    ValidationManager validationManager =
        ValidationManagerUtil.initValidationManager(fileContentMap);
    return validationManager.validate();
  }

  private FileContentHandler getFileContent(InputStream is) throws IOException {
    return getFileContentMapFromZip(FileUtils.toByteArray(is));


  }

}