/**
 *
 */
package org.gcube.portlets.user.workspaceexplorerapp.client.download;

import org.gcube.portlets.user.workspaceexplorerapp.client.NewBrowserWindow;
import org.gcube.portlets.user.workspaceexplorerapp.client.WorkspaceExplorerAppConstants;

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;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;

/**
 * The Class RequestBuilderWorkspaceValidateItem.
 *
 * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
 * @Jun 24, 2013
 */
public class RequestBuilderWorkspaceValidateItem {

	private AsyncCallback<WindowOpenParameter> callback;
	private String parameters;

	/**
	 * Instantiates a new request builder workspace validate item.
	 *
	 * @param method the method
	 * @param servletName the name of the servlet that must be called
	 * @param params param=value&param1=value1&...
	 * @param targetWindow the target of the window (e.g. "_blank")
	 * @param callback the callback
	 * @throws Exception the exception
	 */
	public RequestBuilderWorkspaceValidateItem(RequestBuilder.Method method, String servletName, final String params, final String targetWindow, final AsyncCallback<WindowOpenParameter> callback) throws Exception{

		this.callback = callback;

		final NewBrowserWindow newBrowserWindow = NewBrowserWindow.open("", targetWindow, "");

		this.parameters = params;

		if(servletName==null)
			return;

		servletName = servletName.isEmpty()?"/":servletName;

		if(!servletName.contains("/"))
			servletName+="/"+servletName;

		if(parameters==null)
			parameters = WorkspaceExplorerAppConstants.VALIDATEITEM+"=true";
		else
			parameters +="&"+WorkspaceExplorerAppConstants.VALIDATEITEM+"=true";

		String urlRequest = servletName+"?"+parameters;

		GWT.log("request builder for: "+urlRequest);

		RequestBuilder requestBuilder = new RequestBuilder(method, urlRequest);
		try {

			requestBuilder.sendRequest("", new RequestCallback() {

			    @Override
			    public void onResponseReceived(Request request,  Response response) {

			    	int status = response.getStatusCode();

			        if(!(status==200) && !(status==202)){ //NOT IS STATUS SC_ACCEPTED

//			        	if(status==401){ // SC_UNAUTHORIZED = 401;
//			        		GWT.log("Session expired");
//							AppControllerExplorer.getEventBus().fireEvent(new SessionExpiredEvent());
//							return;
//			        	}
			        	newBrowserWindow.close();
			        	handleError("Sorry, an error occurred on retriving the file. "+response.getText()); //ERROR STATUS

				    }else { //OK STATUS

				    	if(callback!=null){
				    		//PASSING PARAMS WITHOUT VALIDATION=TRUE
				    		callback.onSuccess(new WindowOpenParameter(targetWindow, "", params, true, newBrowserWindow));
				    	}
				    }
			    }

			    @Override
			    public void onError(Request request, Throwable exception) {
			    	newBrowserWindow.close();

//			    	System.out.println("exception message is "+exception.getMessage());
			    	handleError(exception.getMessage());
			    }
			});

		} catch (RequestException e) {
			newBrowserWindow.close();
			throw new Exception("Sorry, an error occurred while contacting server, try again");
		}
	}

	/**
	 * Handle error.
	 *
	 * @param message the message
	 */
	public void handleError(String message){

		if(callback!=null)
    		callback.onFailure(new Exception(message));
    	else
    		Window.alert("Error: "+message);

	}
}