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/* 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.activiti.explorer;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.activiti.editor.ui.EditorProcessDefinitionPage;
import org.activiti.engine.HistoryService;
import org.activiti.engine.IdentityService;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.TaskService;
import org.activiti.engine.identity.Group;
import org.activiti.engine.task.IdentityLink;
import org.activiti.engine.task.Task;
import org.activiti.explorer.ui.AbstractPage;
import org.activiti.explorer.ui.MainWindow;
import org.activiti.explorer.ui.management.ManagementMenuBar;
import org.activiti.explorer.ui.management.admin.AdministrationPage;
import org.activiti.explorer.ui.management.crystalball.CrystalBallPage;
import org.activiti.explorer.ui.management.db.DatabasePage;
import org.activiti.explorer.ui.management.deployment.DeploymentPage;
import org.activiti.explorer.ui.management.identity.GroupPage;
import org.activiti.explorer.ui.management.identity.UserPage;
import org.activiti.explorer.ui.management.job.JobPage;
import org.activiti.explorer.ui.management.processdefinition.ActiveProcessDefinitionPage;
import org.activiti.explorer.ui.management.processdefinition.SuspendedProcessDefinitionPage;
import org.activiti.explorer.ui.process.MyProcessInstancesPage;
import org.activiti.explorer.ui.process.ProcessDefinitionPage;
import org.activiti.explorer.ui.process.ProcessMenuBar;
import org.activiti.explorer.ui.process.simple.editor.SimpleTableEditor;
import org.activiti.explorer.ui.profile.ProfilePopupWindow;
import org.activiti.explorer.ui.reports.ReportsMenuBar;
import org.activiti.explorer.ui.reports.RunReportsPage;
import org.activiti.explorer.ui.reports.SavedReportsPage;
import org.activiti.explorer.ui.task.ArchivedPage;
import org.activiti.explorer.ui.task.InboxPage;
import org.activiti.explorer.ui.task.InvolvedPage;
import org.activiti.explorer.ui.task.QueuedPage;
import org.activiti.explorer.ui.task.TaskMenuBar;
import org.activiti.explorer.ui.task.TasksPage;
import org.activiti.workflow.simple.definition.WorkflowDefinition;
import org.springframework.beans.factory.annotation.Autowired;

import com.vaadin.ui.Window;


/**
 * @author Joram Barrez
 */
public class DefaultViewManager implements ViewManager, Serializable {
  
  private static final long serialVersionUID = -1712344958488358861L;

  protected AbstractPage currentPage;
  
  @Autowired
  protected MainWindow mainWindow;

  protected transient TaskService taskService;
  protected transient HistoryService historyService;
  protected transient IdentityService identityService;
  
  public DefaultViewManager() {
    this.taskService = ProcessEngines.getDefaultProcessEngine().getTaskService();
    this.historyService = ProcessEngines.getDefaultProcessEngine().getHistoryService();
    this.identityService = ProcessEngines.getDefaultProcessEngine().getIdentityService();
  }
  
  public void showLoginPage() {
    if(!mainWindow.isShowingLoginPage()) {
      mainWindow.showLoginPage();      
    }
  }
  
  public void showDefaultPage() {
    mainWindow.showDefaultContent();
    showInboxPage();
  }
  
  public void showPopupWindow(Window window) {
    mainWindow.addWindow(window);
  }
  
  // Tasks 
  
  /**
   * Generic method which will figure out to which
   * task page must be jumped, based on the task data.
   * 
   * Note that, if possible, it is always more
   * performant to use the more specific showXXXPage() methods.
   */
  public void showTaskPage(String taskId) {
    Task task = taskService.createTaskQuery().taskId(taskId).singleResult();
    String loggedInUserId = ExplorerApp.get().getLoggedInUser().getId();
    
    if (task == null) {
      // If no runtime task exists, our only hope is the archive page
      boolean isOwner = historyService.createHistoricTaskInstanceQuery()
        .taskId(taskId).taskOwner(loggedInUserId).count() == 1;
      if (isOwner) {
        showArchivedPage(taskId);
      } else {
        showNavigationError(taskId);
      }
    } else if (loggedInUserId.equals(task.getOwner())) {
      showTasksPage(taskId);
    } else if (loggedInUserId.equals(task.getAssignee())) {
      showInboxPage(taskId);
    } else if (taskService.createTaskQuery().taskInvolvedUser(loggedInUserId).count() == 1) {
      showInvolvedPage(taskId);
    } else {
      // queued
      List groupIds = getGroupIds(loggedInUserId);
      List identityLinks = taskService.getIdentityLinksForTask(task.getId());
      Iterator identityLinkIterator = identityLinks.iterator();
        
      boolean pageFound = false;
      while (!pageFound && identityLinkIterator.hasNext()) {
        IdentityLink identityLink = identityLinkIterator.next();
        if (identityLink.getGroupId() != null && groupIds.contains(identityLink.getGroupId())) {
          showQueuedPage(identityLink.getGroupId(), task.getId());
          pageFound = true;
        }
      }
      
      // We've tried hard enough, the user now gets a notification. He deserves it.
      if (!pageFound) {
        showNavigationError(taskId);
      }
    }
  }

  protected List getGroupIds(String userId) {
    List groupIds = new ArrayList();
    List groups = identityService.createGroupQuery().groupMember(userId).list();
    for (Group group : groups) {
      groupIds.add(group.getId());
    }
    
    return groupIds;
  }
  
  protected void showNavigationError(String taskId) {
    ExplorerApp.get().getNotificationManager().showErrorNotification(
            Messages.NAVIGATION_ERROR_NOT_INVOLVED_TITLE, 
            ExplorerApp.get().getI18nManager().getMessage(Messages.NAVIGATION_ERROR_NOT_INVOLVED, taskId));
  }
  
  public void showTasksPage() {
    switchView(new TasksPage(), ViewManager.MAIN_NAVIGATION_TASK, TaskMenuBar.ENTRY_TASKS);
  }
  
  public void showTasksPage(String taskId) {
    switchView(new TasksPage(taskId), ViewManager.MAIN_NAVIGATION_TASK, TaskMenuBar.ENTRY_TASKS);
  }
  
  public void showInboxPage() {
    switchView(new InboxPage(), ViewManager.MAIN_NAVIGATION_TASK, TaskMenuBar.ENTRY_INBOX);
  }
  
  public void showInboxPage(String taskId) {
    switchView(new InboxPage(taskId), ViewManager.MAIN_NAVIGATION_TASK, TaskMenuBar.ENTRY_INBOX);
  }
  
  public void showQueuedPage(String groupId) {
    switchView(new QueuedPage(groupId), ViewManager.MAIN_NAVIGATION_TASK, TaskMenuBar.ENTRY_QUEUED);
  }
  
  public void showQueuedPage(String groupId, String taskId) {
    switchView(new QueuedPage(groupId, taskId), ViewManager.MAIN_NAVIGATION_TASK, TaskMenuBar.ENTRY_QUEUED);
  }
  
  public void showInvolvedPage() {
    switchView(new InvolvedPage(), ViewManager.MAIN_NAVIGATION_TASK, TaskMenuBar.ENTRY_INVOLVED);
  }
  
  public void showInvolvedPage(String taskId) {
    switchView(new InvolvedPage(taskId), ViewManager.MAIN_NAVIGATION_TASK, TaskMenuBar.ENTRY_INVOLVED);
  }
  
  public void showArchivedPage() {
    switchView(new ArchivedPage(), ViewManager.MAIN_NAVIGATION_TASK, TaskMenuBar.ENTRY_ARCHIVED);
  }
  
  public void showArchivedPage(String taskId) {
    switchView(new ArchivedPage(taskId), ViewManager.MAIN_NAVIGATION_TASK, TaskMenuBar.ENTRY_ARCHIVED);
  }
  
  // Process
  
  public void showDeployedProcessDefinitionPage() {
    switchView(new ProcessDefinitionPage(), ViewManager.MAIN_NAVIGATION_PROCESS, ProcessMenuBar.DEPLOYED_PROCESS_DEFINITIONS);
  }
  
  public void showDeployedProcessDefinitionPage(String processDefinitionId) {
    switchView(new ProcessDefinitionPage(processDefinitionId), ViewManager.MAIN_NAVIGATION_PROCESS, ProcessMenuBar.DEPLOYED_PROCESS_DEFINITIONS);
  }
  
  public void showEditorProcessDefinitionPage() {
    switchView(new EditorProcessDefinitionPage(), ViewManager.MAIN_NAVIGATION_PROCESS, ProcessMenuBar.EDITOR_PROCESS_DEFINITIONS);
  }
  
  public void showEditorProcessDefinitionPage(String modelId) {
    switchView(new EditorProcessDefinitionPage(modelId), ViewManager.MAIN_NAVIGATION_PROCESS, ProcessMenuBar.EDITOR_PROCESS_DEFINITIONS);
  }
  
  public void showMyProcessInstancesPage() {
    switchView(new MyProcessInstancesPage(), ViewManager.MAIN_NAVIGATION_PROCESS, ProcessMenuBar.ENTRY_MY_PROCESS_INSTANCES);
  }
  
  public void showMyProcessInstancesPage(String processInstanceId) {
    switchView(new MyProcessInstancesPage(processInstanceId), ViewManager.MAIN_NAVIGATION_PROCESS, ProcessMenuBar.ENTRY_MY_PROCESS_INSTANCES);
  }
  
  public void showSimpleTableProcessEditor(String processName, String processDescription) {
    switchView(new SimpleTableEditor(processName, processDescription), ViewManager.MAIN_NAVIGATION_PROCESS, null);
  }
  
  public void showSimpleTableProcessEditor(String modelId, WorkflowDefinition workflowDefinition) {
    switchView(new SimpleTableEditor(modelId, workflowDefinition), ViewManager.MAIN_NAVIGATION_PROCESS, null);
  }
  
  // Reporting
  
  public void showRunReportPage() {
    switchView(new RunReportsPage(), ViewManager.MAIN_NAVIGATION_REPORT, ReportsMenuBar.ENTRY_RUN_REPORTS);
  }
  
  public void showRunReportPage(String reportId) {
    switchView(new RunReportsPage(reportId), ViewManager.MAIN_NAVIGATION_REPORT, ReportsMenuBar.ENTRY_RUN_REPORTS);
  }


  public void showSavedReportPage() {
    switchView(new SavedReportsPage(), ViewManager.MAIN_NAVIGATION_REPORT, ReportsMenuBar.ENTRY_SAVED_REPORTS);
  }
  
  @Override
  public void showSavedReportPage(String reportId) {
    switchView(new SavedReportsPage(reportId), ViewManager.MAIN_NAVIGATION_REPORT, ReportsMenuBar.ENTRY_SAVED_REPORTS);
  }
  
  // Management
  
  public void showDatabasePage() {
    switchView(new DatabasePage(), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_DATABASE);
  }
  
  public void showDatabasePage(String tableName) {
    switchView(new DatabasePage(tableName), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_DATABASE);
  }
  
  public void showDeploymentPage() {
    switchView(new DeploymentPage(), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_DEPLOYMENTS);
  }
  
  public void showDeploymentPage(String deploymentId) {
    switchView(new DeploymentPage(deploymentId), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_DEPLOYMENTS);
  }
  
  public void showActiveProcessDefinitionsPage() {
    switchView(new ActiveProcessDefinitionPage(), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_ACTIVE_PROCESS_DEFINITIONS);
  }
  
  public void showActiveProcessDefinitionsPage(String processDefinitionId) {
    switchView(new ActiveProcessDefinitionPage(processDefinitionId), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_ACTIVE_PROCESS_DEFINITIONS);
  }
  
  public void showSuspendedProcessDefinitionsPage() {
    switchView(new SuspendedProcessDefinitionPage(), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_SUSPENDED_PROCESS_DEFINITIONS);
  }
  
  public void showSuspendedProcessDefinitionsPage(String processDefinitionId) {
    switchView(new SuspendedProcessDefinitionPage(processDefinitionId), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_SUSPENDED_PROCESS_DEFINITIONS);
  }
  
  public void showJobPage() {
    switchView(new JobPage(), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_JOBS);
  }
  
  public void showJobPage(String jobId) {
    switchView(new JobPage(jobId), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_JOBS);
  }
  
  public void showUserPage() {
    switchView(new UserPage(), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_USERS);
  }
  
  public void showUserPage(String userId) {
    switchView(new UserPage(userId), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_USERS);
  }
  
  public void showGroupPage() {
    switchView(new GroupPage(), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_GROUPS);
  }
  
  public void showGroupPage(String groupId) {
    switchView(new GroupPage(groupId), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_GROUPS);
  }
  
  public void showProcessInstancePage() {
    throw new UnsupportedOperationException(); // Only for alfresco admin app
  }
  
  public void showProcessInstancePage(String processInstanceId) {
    throw new UnsupportedOperationException(); // Only for alfresco admin app
  }
  
  public void showAdministrationPage() {
    switchView(new AdministrationPage(), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_ADMIN);
  }
  
  public void showAdministrationPage(String managementId) {
    switchView(new AdministrationPage(managementId), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_ADMIN);
  }
  
  public void showCrystalBallPage() {
    switchView(new CrystalBallPage(), ViewManager.MAIN_NAVIGATION_MANAGE, ManagementMenuBar.ENTRY_CRYSTALBALL);
  }
  
  // Profile
  
  public void showProfilePopup(String userId) {
    showPopupWindow(new ProfilePopupWindow(userId));
  }
  
  // Helper
  
  protected void switchView(AbstractPage page, String mainMenuActive, String subMenuActive) {
    currentPage = page;
    mainWindow.setMainNavigation(mainMenuActive);
    mainWindow.switchView(page);
    if (subMenuActive != null && page.getToolBar() != null) {
      page.getToolBar().setActiveEntry(subMenuActive); // Must be set AFTER adding page to window (toolbar will be created in atach())
    }
  }
  
  public AbstractPage getCurrentPage() {
    return currentPage;
  }
  
  public void setMainWindow(MainWindow mainWindow) {
    this.mainWindow = mainWindow;
  }
  
}