MessageComposePresenter.java

package kornell.gui.client.presentation.message.compose;

import java.util.ArrayList;

import com.google.gwt.core.client.GWT;
import com.google.gwt.place.shared.PlaceController;
import com.google.gwt.user.client.ui.Widget;

import kornell.api.client.Callback;
import kornell.api.client.ChatThreadsClient;
import kornell.api.client.KornellSession;
import kornell.core.entity.EntityFactory;
import kornell.core.to.CourseClassTO;
import kornell.gui.client.KornellConstants;
import kornell.gui.client.ViewFactory;
import kornell.gui.client.personnel.MrPostman;
import kornell.gui.client.presentation.classroom.ClassroomPlace;
import kornell.gui.client.util.forms.FormHelper;
import kornell.gui.client.util.view.KornellNotification;

public class MessageComposePresenter implements MessageComposeView.Presenter {
	private FormHelper formHelper = GWT.create(FormHelper.class);
	private KornellConstants constants = GWT.create(KornellConstants.class);
	
	private MessageComposeView view;
	private PlaceController placeCtrl;
	private ChatThreadsClient threadsClient;
	private ViewFactory viewFactory;
	private KornellSession session;

	public MessageComposePresenter(PlaceController placeCtrl, KornellSession session, ViewFactory viewFactory, EntityFactory entityFactory) {
		this.placeCtrl = placeCtrl;
		this.threadsClient = session.chatThreads();
		this.viewFactory = viewFactory;
		this.session = session;
	}


	@Override
	public void init(ArrayList<CourseClassTO> helpCourseClasses) {
		if(view == null){
			view = viewFactory.getMessageComposeView();
			view.setPresenter(this);
		}
		
		//check if it's inside the classroom to preselect the recipient
		view.show(helpCourseClasses, getCourseClassUUIDFromPlace());
	}

	private String getCourseClassUUIDFromPlace() {
		if(placeCtrl.getWhere() instanceof ClassroomPlace){
			return session.getCurrentCourseClass().getCourseClass().getUUID();
		}
		return null;
  }

	@Override
	public void okButtonClicked() {
		if(validateMessage()){
			String messageText = view.getMessageText().getFieldPersistText();
			Callback<String> chatThreadCallback = new Callback<String>() {
				@Override
				public void ok(String str) {
					KornellNotification.show(constants.messageSentSuccess());
					MrPostman.hide();
				}
			};
			String threadSelectValue = view.getRecipient().getFieldPersistText();
			if("platformSupport".equals(threadSelectValue)){
				threadsClient.postMessageToSupportPlatformThread(messageText, chatThreadCallback);
			} else if("institutionSupport".equals(threadSelectValue)){
				threadsClient.postMessageToSupportInstitutionThread(messageText, chatThreadCallback);
			} else {
				threadsClient.postMessageToSupportCourseClassThread(messageText, threadSelectValue, chatThreadCallback);
			}
		}
	}

	@Override
  public void cancelButtonClicked() {
		MrPostman.hide();
  }
	
	private boolean validateMessage() {	
		view.clearErrors();		
		if (!formHelper.isLengthValid(view.getMessageText().getFieldPersistText(), 1, 1000)) {
			view.getMessageText().setError(constants.noMessageBodyError());
		}
		return !view.checkErrors();
	}

	@Override
	public Widget asWidget() {
		return view.asWidget();
	}

}