/*
    * Copyright (C) 2003-2014 eXo Platform SAS.
    *
    * This program is free software: you can redistribute it and/or modify
    * it under the terms of the GNU Affero General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
    * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU Affero General Public License for more details.
   *
   * You should have received a copy of the GNU Affero General Public License
   * along with this program. If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.exoplatform.calendar.ws;
  
  import javax.ws.rs.Path;
  import javax.ws.rs.core.UriInfo;
  
  import java.lang.reflect.Method;
  import java.net.URI;
  import java.util.LinkedList;
  import java.util.List;
  
  import org.exoplatform.services.rest.resource.ResourceContainer;
  
  public class SubResourceHrefBuilder {
    private List<String> subResources = new LinkedList<String>();
    
    public SubResourceHrefBuilder(ResourceContainer restService) {
      subResources = getResourcesInfo(restService);
    }
  
    public String[] buildResourceMap(UriInfo uriInfo) {
      List<String> resources = new LinkedList<String>();
          
      StringBuilder uriBuilder = new StringBuilder();
      URI uri = uriInfo.getBaseUri();
      uriBuilder.append(uri.getScheme()).append("://");
      uriBuilder.append(uri.getHost());
      if (uri.getPort() != 80 && uri.getPort() != 443) {
        uriBuilder.append(":").append(uri.getPort());
      }
      uriBuilder.append(uri.getPath());
      String base = uriBuilder.toString();
      
      for (String rs : subResources) {
        resources.add(base + rs);
      }
      return resources.toArray(new String[resources.size()]);
    }
    
    private List<String> getResourcesInfo(ResourceContainer restService) {
      List<String> subResources = new LinkedList<String>();
      
      Path path = restService.getClass().getAnnotation(Path.class);
      if (path == null) {
        throw new IllegalStateException("base path for " + restService + " is not found");
      }
      String basePath = path.value();
      
      for (Method method : restService.getClass().getMethods()) {
        Path mPath = method.getAnnotation(Path.class);
        
        if (mPath != null) {
          String methodPath = mPath.value();       
          
          subResources.add(basePath + methodPath);
        }
      }
      
      return subResources;
    }
  }