/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * 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.
   */
  package org.argeo.slc.client.ui.specific;
  
  import java.net.URL;
  import java.util.UUID;
  
  import javax.jcr.Node;
  import javax.jcr.Session;
  
  import org.argeo.slc.SlcException;
  import org.argeo.slc.client.rap.OpenJcrFileService;
  import org.argeo.slc.repo.RepoService;
  import org.eclipse.core.commands.AbstractHandler;
  import org.eclipse.core.commands.ExecutionEvent;
  import org.eclipse.core.commands.ExecutionException;
  import org.eclipse.rap.rwt.RWT;
  //import org.eclipse.rap.rwt.service.IServiceHandler;
  //import org.eclipse.rap.rwt.service.IServiceManager;
  import org.eclipse.ui.PlatformUI;
  
  /**
   * Rap specific command handler to open a file retrieved from a distant JCR
   * Repository. It creates and register a service instantiated with the
   * corresponding JCR node, forwards the request, and un register the service on
   * dispose
   * 
   * This command and the corresponding service are specific for RAP version [1.3,
   * 2)
   */
  public class OpenJcrFile extends AbstractHandler {
  
  	// Use (new OpenJcrFileCmdId()).getCmdId() instead.
  	// public final String ID = SlcRapPlugin.PLUGIN_ID + ".openJcrFile";
  	
  	public final static String PARAM_REPO_NODE_PATH = "param.repoNodePath";
  	public final static String PARAM_REPO_URI = "param.repoUri";
  	public final static String PARAM_WORKSPACE_NAME = "param.workspaceName";
  	public final static String PARAM_FILE_PATH = "param.filePath";
  
  	private RepoService repoService;
  	private String currentServiceId;
  
  	public Object execute(ExecutionEvent event) throws ExecutionException {
  
  		String repoNodePath = event.getParameter(PARAM_REPO_NODE_PATH);
  		String repoUri = event.getParameter(PARAM_REPO_URI);
  		String wkspName = event.getParameter(PARAM_WORKSPACE_NAME);
  		String filePath = event.getParameter(PARAM_FILE_PATH);
  
  		// TODO sanity check
  		if (filePath == null || "".equals(filePath.trim()))
  			return null;
  		Session businessSession = null;
  		try {
  			businessSession = repoService.getRemoteSession(repoNodePath,
  					repoUri, wkspName);
  			Node result = businessSession.getNode(filePath);
  
  			// Create a temporary service. No better solution has been found
  			// yet.
  			currentServiceId = UUID.randomUUID().toString();
  			OpenJcrFileService ojfs = new OpenJcrFileService(result);
  			// FIXME replace it
  //			IServiceManager manager = RWT.getServiceManager();
  //			manager.registerServiceHandler(currentServiceId, ojfs);
  			String urlStr = createFullDownloadUrl(currentServiceId);
  			URL url = new URL(urlStr);
  			PlatformUI.getWorkbench().getBrowserSupport()
  					.createBrowser("DownloadDialog").openURL(url);
  		} catch (Exception e) {
  			throw new SlcException("Unable to open Jcr File for path "
  					+ filePath, e);
  		}
  
  		return null;
  	}
  
  	@Override
  	public void dispose() {
  //		IServiceManager manager = RWT.getServiceManager();
  //		manager.unregisterServiceHandler(currentServiceId);
  		super.dispose();
  	}
  
  	private String createFullDownloadUrl(String serviceId) {
 		StringBuilder url = new StringBuilder();
 		url.append(RWT.getRequest().getRequestURL());
 
 		StringBuilder params = new StringBuilder();
 		params.append("?");
 		// FIXME commented out so that it builds
 		//params.append(IServiceHandler.REQUEST_PARAM).append("=");
 		params.append(serviceId);
 		String encodedURL = RWT.getResponse().encodeURL(params.toString());
 		url.append(encodedURL);
 		return url.toString();
 	}
 
 	/* Dependency Injection */
 	public void setRepoService(RepoService repoService) {
 		this.repoService = repoService;
 	}
 }