/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.hc.client5.http.impl.cache;
  
  import java.net.URI;
  
  import org.apache.hc.client5.http.cache.HeaderConstants;
  import org.apache.hc.client5.http.cache.HttpCacheEntry;
  import org.apache.hc.client5.http.utils.DateUtils;
  import org.apache.hc.client5.http.utils.URIUtils;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpHeaders;
  import org.apache.hc.core5.http.HttpRequest;
  import org.apache.hc.core5.http.HttpResponse;
  
  class CacheInvalidatorBase {
  
      static boolean shouldInvalidateHeadCacheEntry(final HttpRequest req, final HttpCacheEntry parentCacheEntry) {
          return requestIsGet(req) && isAHeadCacheEntry(parentCacheEntry);
      }
  
      static boolean requestIsGet(final HttpRequest req) {
          return req.getMethod().equals((HeaderConstants.GET_METHOD));
      }
  
      static boolean isAHeadCacheEntry(final HttpCacheEntry parentCacheEntry) {
          return parentCacheEntry != null && parentCacheEntry.getRequestMethod().equals(HeaderConstants.HEAD_METHOD);
      }
  
      static boolean isSameHost(final URI requestURI, final URI targetURI) {
          return targetURI.isAbsolute() && targetURI.getAuthority().equalsIgnoreCase(requestURI.getAuthority());
      }
  
      static boolean requestShouldNotBeCached(final HttpRequest req) {
          final String method = req.getMethod();
          return notGetOrHeadRequest(method);
      }
  
      static boolean notGetOrHeadRequest(final String method) {
          return !(HeaderConstants.GET_METHOD.equals(method) || HeaderConstants.HEAD_METHOD.equals(method));
      }
  
      private static URI getLocationURI(final URI requestUri, final HttpResponse response, final String headerName) {
          final Header h = response.getFirstHeader(headerName);
          if (h == null) {
              return null;
          }
          final URI locationUri = HttpCacheSupport.normalizeQuetly(h.getValue());
          if (locationUri == null) {
              return requestUri;
          }
          if (locationUri.isAbsolute()) {
              return locationUri;
          } else {
              return URIUtils.resolve(requestUri, locationUri);
          }
      }
  
      static URI getContentLocationURI(final URI requestUri, final HttpResponse response) {
          return getLocationURI(requestUri, response, HttpHeaders.CONTENT_LOCATION);
      }
  
      static URI getLocationURI(final URI requestUri, final HttpResponse response) {
          return getLocationURI(requestUri, response, HttpHeaders.LOCATION);
      }
  
      static boolean responseAndEntryEtagsDiffer(final HttpResponse response,
              final HttpCacheEntry entry) {
          final Header entryEtag = entry.getFirstHeader(HeaderConstants.ETAG);
          final Header responseEtag = response.getFirstHeader(HeaderConstants.ETAG);
          if (entryEtag == null || responseEtag == null) {
              return false;
          }
          return (!entryEtag.getValue().equals(responseEtag.getValue()));
      }
 
     static boolean responseDateOlderThanEntryDate(final HttpResponse response, final HttpCacheEntry entry) {
         return DateUtils.isBefore(response, entry, HttpHeaders.DATE);
     }
 
 }