/**********************************************
    * Copyright (C) 2011 Lukas Laag
    * This file is part of svgreal.
    * 
    * svgreal is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    * 
   * svgreal 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 General Public License for more details.
   * 
   * You should have received a copy of the GNU General Public License
   * along with svgreal.  If not, see http://www.gnu.org/licenses/
   **********************************************/
  package org.vectomatic.svg.edit.client.load;
  
  import java.io.IOException;
  
  import org.vectomatic.dom.svg.utils.OMSVGParser;
  import org.vectomatic.dom.svg.utils.ParserException;
  import org.vectomatic.svg.edit.client.AppConstants;
  import org.vectomatic.svg.edit.client.AppMessages;
  import org.vectomatic.svg.edit.client.SvgrealApp;
  
  import com.google.gwt.core.client.GWT;
  import com.google.gwt.http.client.Request;
  import com.google.gwt.http.client.RequestBuilder;
  import com.google.gwt.http.client.RequestCallback;
  import com.google.gwt.http.client.RequestException;
  import com.google.gwt.http.client.Response;
  
  /**
   * Class to load URLs into the application
   * @author laaglu
   */
  public class UrlLoadRequest extends LoadRequestBase {
  	private String url;
  	public UrlLoadRequest(String url) {
  		this.url = url;
  		int index = url.lastIndexOf('/');
  		this.title = (index != -1 && index != url.length() - 1) ? url.substring(index + 1) : url;
  	}
  
  	@Override
  	public void load() {
  		final SvgrealApp app = SvgrealApp.getApp();
  		final String resourceUrl = FetchUtils.getFetchUrl(url, "text/xml");
  		RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.GET, resourceUrl);
  		requestBuilder.setCallback(new RequestCallback() {
  			public void onError(Request request, Throwable e) {
  				GWT.log("Cannot fetch " + url, e);
  				app.info(AppConstants.INSTANCE.openUrlMenuItem(), AppMessages.INSTANCE.loadErrorMessage(url, e.getMessage()));
  			}
  
  			private void onSuccess(Request request, Response response) {
  				try {
  					app.addWindow(OMSVGParser.parse(response.getText()), UrlLoadRequest.this);
  				} catch(ParserException e) {
  					app.info(AppConstants.INSTANCE.openLocalMenuItem(), AppMessages.INSTANCE.loadErrorMessage(resourceUrl, e.getMessage()));
  				}
  			}
  			
  			public void onResponseReceived(Request request, Response response) {
  				if (response.getStatusCode() == Response.SC_OK) {
  					onSuccess(request, response);
  				} else {
  					onError(request, new IOException(AppMessages.INSTANCE.httpErrorMessage(Integer.toString(response.getStatusCode()))));
  				}
  			}
  		});
  		try {
  			requestBuilder.send();
  		} catch (RequestException e) {
  			GWT.log("Cannot fetch " + url, e);
  			app.info(AppConstants.INSTANCE.openUrlMenuItem(), AppMessages.INSTANCE.loadErrorMessage(url, e.getMessage()));
  		}
  	}
  
  	@Override
  	public boolean equals(Object o) {
  		if (o instanceof UrlLoadRequest) {
  			UrlLoadRequest r = (UrlLoadRequest)o;
  			return url.equals(r.url);
  		}
  		return false;
  	}
  	@Override
  	public int hashCode() {
  		return url.hashCode();
  	}
  
  }