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/*
 * Copyright 2008-2012 the original author or authors.
 *
 * 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.broadleafcommerce.openadmin.client.setup;

import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.http.client.UrlBuilder;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.smartgwt.client.widgets.Canvas;
import org.broadleafcommerce.openadmin.client.BLCLaunch;
import org.broadleafcommerce.openadmin.client.BLCMain;
import org.broadleafcommerce.openadmin.client.Module;
import org.broadleafcommerce.openadmin.client.presenter.entity.EntityPresenter;
import org.broadleafcommerce.openadmin.client.reflection.AsyncClient;
import org.broadleafcommerce.openadmin.client.security.AdminUser;
import org.broadleafcommerce.openadmin.client.security.SecurityManager;
import org.broadleafcommerce.openadmin.client.service.AbstractCallback;
import org.broadleafcommerce.openadmin.client.service.AppServices;
import org.broadleafcommerce.openadmin.client.view.Display;
import org.broadleafcommerce.openadmin.client.view.UIFactory;

import java.util.HashMap;

/**
 * 
 * @author jfischer
 *
 */
public class AppController implements ValueChangeHandler {

	private static AppController controller = null;

	public static AppController getInstance() {
		if (controller == null) {
			controller = new AppController();
		}
		return controller;
	}

	private final HandlerManager eventBus = new HandlerManager(null);
	private Canvas container;
	private UIFactory uiFactory = new UIFactory();
	private HashMap pages;

	private AppController() {
		bind();
	}

	private void bind() {
		History.addValueChangeHandler(this);
	}
    
    private void buildHistoryNewItem(String pageKey, String moduleKey) {
        String token = History.getToken();
        String destinationPage = "moduleKey="+ moduleKey+"&pageKey="+pageKey;
        if (BLCLaunch.getDefaultItem(token) != null) {
            destinationPage = destinationPage + "&itemId="+BLCLaunch.getDefaultItem(token);
        }
        History.newItem(destinationPage);
    }

    public void clearCurrentView() {
        uiFactory.clearCurrentView();
    }

	public void go(final Canvas container, HashMap pages, String pageKey, String moduleKey, boolean firstTime) {
		this.pages = pages;
		this.container = container;

        if (firstTime) {
            String token = History.getToken();
            if (pageKey.equals(BLCLaunch.getSelectedPage(token)) && moduleKey.equals(BLCLaunch.getSelectedModule(token))) {
                String itemId = BLCLaunch.getDefaultItem(token);
                showView(pages.get(pageKey)[0], pages.get(pageKey)[1], itemId);
            } else {
                buildHistoryNewItem(pageKey, moduleKey);
            }
            return;
        }

        if (pageKey != null && pages.get(pageKey) != null) {
            if (SecurityManager.getInstance().isUserAuthorizedToViewSection(pages.get(pageKey)[0])) {
                buildHistoryNewItem(pageKey, moduleKey);
                return;
            }
        }

        for (String sectionTitle : pages.keySet()){
	        if (SecurityManager.getInstance().isUserAuthorizedToViewSection(pages.get(sectionTitle)[0])){
                buildHistoryNewItem(sectionTitle, moduleKey);
			    break;
	    	}
		}
	}

	public HandlerManager getEventBus() {
		return eventBus;
	}

	public void onValueChange(ValueChangeEvent event) {
		String token = event.getValue();

        if (token != null) {
            String page = BLCLaunch.getSelectedPage(token);
            String moduleName = BLCLaunch.getSelectedModule(token);
            String itemId = BLCLaunch.getDefaultItem(token);

            if (page != null && moduleName != null) {
                if (!uiFactory.equalsCurrentView(page) || itemId != null) {
                    Module module = BLCMain.getModule(moduleName);                    
                    String[] vals = module.getPages().get(page);
                    if (vals != null) {
                        showView(vals[0], vals[1], itemId);
                    }
                }
            }
        }
	}

	protected void showView(final String viewKey, final String presenterKey, final String itemId) {
        if (!BLCMain.ISNEW) {
            BLCMain.MODAL_PROGRESS.startProgress(new Timer() {
                public void run() {
                    setupView(viewKey, presenterKey, itemId);
                }
            });
        } else {
            setupView(viewKey, presenterKey, itemId);
        }
	}

    protected void setupView(final String viewKey, final String presenterKey, final String itemId) {
        AppServices.SECURITY.getAdminUser(new AbstractCallback() {
            @Override
            public void onSuccess(AdminUser result) {
                if (result == null) {
                    UrlBuilder builder = Window.Location.createUrlBuilder();
                    builder.setPath(BLCMain.webAppContext + "/adminLogout.htm");
                    builder.setParameter("time", String.valueOf(System.currentTimeMillis()));
                    Window.open(builder.buildString(), "_self", null);
                } else {
                    if (SecurityManager.getInstance().isUserAuthorizedToViewSection(viewKey)){
                        uiFactory.clearCurrentView();
                        uiFactory.getView(viewKey, false, false, new AsyncClient() {
                            @Override
                            public void onSuccess(Object instance) {
                                final Display view = (Display) instance;
                                uiFactory.getPresenter(presenterKey, new AsyncClient() {
                                    @Override
                                    public void onSuccess(Object instance) {
                                        EntityPresenter presenter = (EntityPresenter) instance;
                                        presenter.setDefaultItemId(itemId);
                                        presenter.setDisplay(view);
                                        presenter.setEventBus(eventBus);
                                        BLCMain.currentViewKey = viewKey;
                                        if (presenter.getPresenterSequenceSetupManager() != null) {
                                            presenter.getPresenterSequenceSetupManager().setCanvas(container);
                                            presenter.setup();
                                            presenter.getPresenterSequenceSetupManager().launch();
                                        } else {
                                            presenter.setup();
                                        }
                                    }

                                    @Override
                                    public void onUnavailable() {
                                        throw new RuntimeException("Unable to show item: " + presenterKey);
                                    }
                                });
                            }

                            @Override
                            public void onUnavailable() {
                                throw new RuntimeException("Unable to show item: " + viewKey);
                            }
                        });
                    }
                }
            }
        });
    }
}




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