/**
 * ============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.sa.rest;

import org.onap.aai.sa.searchdbabstraction.util.SearchDbConstants;
import org.onap.aai.cl.mdc.MdcContext;
import org.slf4j.MDC;

import java.util.UUID;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Response;


public class ApiUtils {

  public static final String SEARCH_AUTH_POLICY_NAME = "search";
  public static final String URL_PREFIX = "services/search-data-service/v1/search";

  public enum Action {
    POST, GET, PUT, DELETE
  }

  ;


  /**
   * This method uses the contents of the supplied HTTP headers and request
   * structures to populate the MDC Context used for logging purposes.
   *
   * @param httpReq - HTTP request structure.
   * @param headers - HTTP headers
   */
  protected static void initMdcContext(HttpServletRequest httpReq, HttpHeaders headers) {

    // Auto generate a transaction if we were not provided one.
    String transId = null;
    if (headers != null) {
      transId = headers.getRequestHeaders().getFirst("X-TransactionId");

      if ((transId == null) || (transId.equals(""))) {
        transId = UUID.randomUUID().toString();
      }
    }

    String fromIp = (httpReq != null) ? httpReq.getRemoteAddr() : "";
    String fromApp = (headers != null) ? headers.getRequestHeaders().getFirst("X-FromAppId") : "";

    MdcContext.initialize(transId, SearchDbConstants.SDB_SERVICE_NAME, "", fromApp, fromIp);
  }


  protected static void clearMdcContext() {
    MDC.clear();
  }

  public static String buildIndexUri(String index) {

    return (URL_PREFIX + "/indexes/") + index;
  }

  public static String buildDocumentUri(String index, String documentId) {

    return buildIndexUri(index) + "/documents/" + documentId;
  }

  public static boolean validateIndexUri(String uri) {

    // If the URI starts with a leading '/' character, remove it.
    uri = uri.startsWith("/") ? uri.substring(1) : uri;

    // Now, tokenize the URI string.
    String[] tokens = uri.split("/");

    return (tokens.length == 6) && (tokens[4].equals("indexes"));

  }

  public static boolean validateDocumentUri(String uri, boolean requireId) {

    // If the URI starts with a leading '/' character, remove it.
    uri = uri.startsWith("/") ? uri.substring(1) : uri;

    // Now, tokenize the URI string.
    String[] tokens = uri.split("/");

    if (requireId) {
      return (tokens.length == 8) && (tokens[4].equals("indexes")
          && (tokens[6].equals("documents")));
    } else {
      return ((tokens.length == 8) || (tokens.length == 7))
          && (tokens[4].equals("indexes") && (tokens[6].equals("documents")));
    }
  }

  public static String extractIndexFromUri(String uri) {

    // If the URI starts with a leading '/' character, remove it.
    uri = uri.startsWith("/") ? uri.substring(1) : uri;

    // Now, tokenize the URI string.
    String[] tokens = uri.split("/");

    int i = 0;
    for (String token : tokens) {
      if (token.equals("indexes")) {
        if (i + 1 < tokens.length) {
          return tokens[i + 1];
        }
      }
      i++;
    }

    return null;
  }

  public static String extractIdFromUri(String uri) {

    // If the URI starts with a leading '/' character, remove it.
    uri = uri.startsWith("/") ? uri.substring(1) : uri;

    // Now, tokenize the URI string.
    String[] tokens = uri.split("/");

    int i = 0;
    for (String token : tokens) {
      if (token.equals("documents")) {
        if (i + 1 < tokens.length) {
          return tokens[i + 1];
        }
      }
      i++;
    }

    return null;
  }

  public static String getHttpStatusString(int httpStatusCode) {
    // Some of the status codes we use are still in draft state in the standards, and are not
    // recognized in the javax library.  We need to manually translate these to human-readable
    // strings.
    String statusString = "Unknown";
    Response.Status status = Response.Status.fromStatusCode(httpStatusCode);

    if (status == null) {
      switch (httpStatusCode) {
        case 207:
          statusString = "Multi Status";
          break;
        default:
      }
    } else {
      statusString = status.toString();
    }

    return statusString;
  }
}