/*
 * Copyright 2011 JBoss Inc 
 *
 * 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.jbpm.formbuilder.client.toolbar;

import java.util.ArrayList;
import java.util.List;

import org.jbpm.formapi.client.CommonGlobals;
import org.jbpm.formbuilder.client.FormBuilderGlobals;
import org.jbpm.formbuilder.client.bus.GetFormRepresentationEvent;
import org.jbpm.formbuilder.client.bus.GetFormRepresentationResponseEvent;
import org.jbpm.formbuilder.client.bus.GetFormRepresentationResponseHandler;
import org.jbpm.formbuilder.client.bus.LoadServerFormEvent;
import org.jbpm.formbuilder.client.bus.ui.EmbededIOReferenceEvent;
import org.jbpm.formbuilder.client.bus.ui.EmbededIOReferenceHandler;
import org.jbpm.formbuilder.client.bus.ui.TaskSelectedEvent;
import org.jbpm.formbuilder.client.bus.ui.TaskSelectedHandler;
import org.jbpm.formbuilder.client.command.LoadFormCommand;
import org.jbpm.formbuilder.client.command.SaveFormCommand;
import org.jbpm.formbuilder.client.messages.I18NConstants;
import org.jbpm.formbuilder.client.options.UndoRedoManager;
import org.jbpm.formbuilder.client.resources.FormBuilderResources;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.EventBus;

/**
 * Toolbar presenter. Registers buttons to send {@link EventBus} notifications
 */
public class ToolBarPresenter {

    private static final String SAVE_TYPE = SaveFormCommand.class.getName();
    private static final String LOAD_TYPE = LoadFormCommand.class.getName();
    
    private final ToolBarView view;
    private final EventBus bus = CommonGlobals.getInstance().getEventBus();
    private final I18NConstants i18n = FormBuilderGlobals.getInstance().getI18n();
    private final FormBuilderResources resources = FormBuilderGlobals.getInstance().getResources();
    private final UndoRedoManager mgr = UndoRedoManager.getInstance();

    private final ToolRegistration saveRef;
    private final List<ToolRegistration> messageRefs = new ArrayList<ToolRegistration>();
    
    public ToolBarPresenter(ToolBarView toolBarView) {
        this.view = toolBarView;

        this.saveRef = this.view.addButton(resources.saveButton(), i18n.SaveChangesButton(), new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                bus.fireEvent(new GetFormRepresentationEvent(SAVE_TYPE));
            }
        });
        this.view.addButton(resources.refreshButton(), i18n.RefreshFromServerButton(), new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                bus.fireEvent(new GetFormRepresentationEvent(LOAD_TYPE));
            }
        });
        this.view.addButton(resources.undoButton(), i18n.UndoButton(), new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                mgr.undo();
            }
        });
        this.view.addButton(resources.redoButton(), i18n.RedoButton(), new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                mgr.redo();
            }
        });
        
        bus.addHandler(GetFormRepresentationResponseEvent.TYPE, new GetFormRepresentationResponseHandler() {
            @Override
            public void onEvent(final GetFormRepresentationResponseEvent event) {
                if (LOAD_TYPE.equals(event.getSaveType())) {
                    view.showDialog(i18n.RefreshButtonWarning(), new ClickHandler() {
                        @Override
                        public void onClick(ClickEvent clickEvent) {
                            if (LOAD_TYPE.equals(event.getSaveType())) {
                                if (event.getRepresentation().isSaved()) {
                                    bus.fireEvent(new LoadServerFormEvent(event.getRepresentation().getName()));
                                }
                            }
                        }
                    });
                }
            }
        });
        bus.addHandler(EmbededIOReferenceEvent.TYPE, new EmbededIOReferenceHandler() {
            @Override
            public void onEvent(EmbededIOReferenceEvent event) {
                if (event.getProfileName() != null) {
                    saveRef.remove();
                }
            }
        });
        bus.addHandler(TaskSelectedEvent.TYPE, new TaskSelectedHandler() {
            @Override
            public void onSelectedTask(TaskSelectedEvent event) {
                if (event.getSelectedTask() == null) {
                    for (ToolRegistration messageRef : messageRefs) {
                        messageRef.remove();
                    }
                } else {
                    messageRefs.add(view.addMessage(i18n.PackageLabel(), event.getSelectedTask().getPackageName()));
                    messageRefs.add(view.addMessage(i18n.ProcessLabel(), event.getSelectedTask().getProcessId()));
                    messageRefs.add(view.addMessage(i18n.TaskNameLabel(), event.getSelectedTask().getTaskName()));
                }
            }
        });
    }
}