/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 * Copyright © 2017 Amdocs
 * ================================================================================
 * 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=========================================================
 *
 * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 */
package org.onap.aai.datarouter.entity;

import java.io.IOException;
import java.io.Serializable;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.List;

import javax.json.Json;
import javax.json.JsonObject;

public class TopographicalEntity implements DocumentStoreDataEntity, Serializable {

  private static final long serialVersionUID = -5188479658230319058L;

  protected String entityType;
  protected String entityPrimaryKeyValue;
  protected String entityPrimaryKeyName;
  protected String latitude;
  protected String longitude;
  protected String selfLink;

  // generated, SHA-256 digest
  protected String id;

  private static String convertBytesToHexString(byte[] bytesToConvert) {
    StringBuilder hexString = new StringBuilder();
    for (int i = 0; i < bytesToConvert.length; i++) {
      hexString.append(Integer.toHexString(0xFF & bytesToConvert[i]));
    }
    return hexString.toString();
  }

  private static String concatArray(List<String> list, char delimiter) {

    if (list == null || list.isEmpty()) {
      return "";
    }

    StringBuilder result = new StringBuilder(64);

    boolean firstValue = true;

    for (String item : list) {

      if (firstValue) {
        result.append(item);
        firstValue = false;
      } else {
        result.append(delimiter).append(item);
      }
    }
    
    return result.toString();
  }

  /*
   * We'll try and create a unique identity key that we can use for
   * differencing the previously imported record sets as we won't have granular
   * control of what is created/removed and when. The best we can hope for is
   * identification of resources by generated Id until the Identity-Service
   * UUID is tagged against all resources, then we can use that instead.
   */
  public static String generateUniqueShaDigest(String entityType, String fieldName,
      String fieldValue) throws NoSuchAlgorithmException {

    /*
     * Basically SHA-256 will result in an identity with a guaranteed
     * uniqueness compared to just a java hashcode value.
     */
    MessageDigest digest = MessageDigest.getInstance("SHA-256");
    digest.update(String.format("%s.%s.%s", entityType, fieldName, fieldValue).getBytes());
    return convertBytesToHexString(digest.digest());
  }

  public TopographicalEntity() {}

  /*
   * (non-Javadoc)
   * 
   * @see org.onap.aai.datarouter.entity.TopographicalEntity#getAsJson()
   */
  @Override
  public String getAsJson() throws IOException {

    JsonObject obj =
        Json.createObjectBuilder().add("entityType", entityType)
          .add("pkey", entityPrimaryKeyValue)
          .add("location", Json.createObjectBuilder()
            .add("lat", latitude)
            .add("lon", longitude))
          .add("selfLink", selfLink).build();

    return obj.toString();
  }


  @Override
  public String toString() {
    return "TopographicalEntity [" + ("entityType=" + entityType + ", ")
        + ("entityPrimaryKeyValue=" + entityPrimaryKeyValue + ", ")
        + ("latitude=" + latitude + ", ") + ("longitude=" + longitude + ", ") 
        + ("ID=" + id + ", ")
        + ("selfLink=" + selfLink) + "]";
  }

  @Override
  public String getId() {
    return this.id;
  }

  public String getEntityType() {
    return entityType;
  }

  public void setEntityType(String entityType) {
    this.entityType = entityType;
  }

  public String getEntityPrimaryKeyValue() {
    return entityPrimaryKeyValue;
  }

  public void setEntityPrimaryKeyValue(String entityPrimaryKeyValue) {
    this.entityPrimaryKeyValue = entityPrimaryKeyValue;
  }

  public String getEntityPrimaryKeyName() {
    return entityPrimaryKeyName;
  }

  public void setEntityPrimaryKeyName(String entityPrimaryKeyName) {
    this.entityPrimaryKeyName = entityPrimaryKeyName;
  }

  public String getLatitude() {
    return latitude;
  }

  public void setLatitude(String latitude) {
    this.latitude = latitude;
  }

  public String getLongitude() {
    return longitude;
  }

  public void setLongitude(String longitude) {
    this.longitude = longitude;
  }

  public String getSelfLink() {
    return selfLink;
  }

  public void setSelfLink(String selfLink) {
    this.selfLink = selfLink;
  }

  public static long getSerialversionuid() {
    return serialVersionUID;
  }

  public void setId(String id) {
    this.id = id;
  }
}