/*******************************************************************************
 * Copyright (c) 2001, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.preferences.ui;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.core.runtime.preferences.DefaultScope;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.core.runtime.preferences.IPreferencesService;
import org.eclipse.core.runtime.preferences.IScopeContext;
import org.eclipse.jface.dialogs.ControlEnableState;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.TabFolder;
import org.eclipse.swt.widgets.TabItem;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.PlatformUI;
import org.eclipse.wst.sse.core.internal.tasks.TaskScanningScheduler;
import org.eclipse.wst.sse.core.internal.tasks.TaskTagPreferenceKeys;
import org.eclipse.wst.sse.ui.internal.Logger;
import org.eclipse.wst.sse.ui.internal.SSEUIMessages;
import org.eclipse.wst.sse.ui.internal.SSEUIPlugin;
import org.eclipse.wst.sse.ui.internal.editor.IHelpContextIds;
import org.eclipse.wst.sse.ui.internal.preferences.TabFolderLayout;
import org.osgi.service.prefs.BackingStoreException;

public class TaskTagPreferencePage extends PropertyPreferencePage {

	private static final boolean _debugPreferences = "true".equalsIgnoreCase(Platform.getDebugOption("org.eclipse.wst.sse.core/tasks/preferences")); //$NON-NLS-1$ //$NON-NLS-2$
	// Remember the last displayed tab for convenience
	private static final String TASK_TAG_LAST_TAB = "task-tag-last-tab"; //$NON-NLS-1$

	private int detectionRequested = 0;

	private Button fEnableCheckbox = null;

	private boolean fEnableTaskTags = true;

	private boolean fOriginalEnableTaskTags = true;

	private IPreferencesService fPreferencesService = null;

	private Button fRedetectButton;

	private SelectionListener fTabEnablementListener;

	private TabFolder fTabFolder;
	private IPreferenceTab[] fTabs = null;

	public TaskTagPreferencePage() {
		super();
		fPreferencesService = Platform.getPreferencesService();
	}

	protected void contributeButtons(Composite parent) {
		if (getElement() == null) {
			((GridLayout) parent.getLayout()).numColumns += 2;
			fRedetectButton = new Button(parent, SWT.PUSH);
			fRedetectButton.setText(SSEUIMessages.TaskTagPreferencePage_32); //$NON-NLS-1$
			fRedetectButton.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END | GridData.VERTICAL_ALIGN_FILL));
			fRedetectButton.setEnabled(true);
			fRedetectButton.addSelectionListener(new SelectionAdapter() {
				public void widgetSelected(SelectionEvent e) {
					Job redetectJob = new Job(SSEUIMessages.TaskTagPreferenceTab_27) { //$NON-NLS-1$
						public Object getAdapter(Class adapter) {
							return null;
						}

						protected IStatus run(IProgressMonitor monitor) {
							TaskScanningScheduler.refresh();
							return Status.OK_STATUS;
						}
					};
					redetectJob.schedule();
				}
			});
			Label spacer = new Label(parent, SWT.NONE);
			spacer.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END | GridData.VERTICAL_ALIGN_CENTER));
		}
		super.contributeButtons(parent);
	}

	protected Control createCommonContents(Composite parent) {
		Composite composite = new Composite(parent, SWT.NONE);
		GridLayout compositeLayout = new GridLayout();
		compositeLayout.marginLeft = 0;
		compositeLayout.marginRight = 0;
		composite.setLayout(compositeLayout);

		IScopeContext[] preferenceScopes = createPreferenceScopes();
		fOriginalEnableTaskTags = fEnableTaskTags = fPreferencesService.getBoolean(getPreferenceNodeQualifier(), TaskTagPreferenceKeys.TASK_TAG_ENABLE, false, preferenceScopes);
		fEnableCheckbox = new Button(composite, SWT.CHECK);
		fEnableCheckbox.setSelection(fEnableTaskTags);
		fEnableCheckbox.setText(SSEUIMessages.TaskTagPreferenceTab_31); //$NON-NLS-1$
		fEnableCheckbox.setSelection(fEnableTaskTags);
		fEnableCheckbox.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING, GridData.VERTICAL_ALIGN_END, false, false, 1, 1));

		fTabFolder = new TabFolder(composite, SWT.NONE);
		fTabFolder.setLayout(new TabFolderLayout());
		fTabFolder.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1));

		TabItem taskItem = new TabItem(fTabFolder, SWT.NONE);
		MainTab mainTab = new MainTab(this, fPreferencesService, preferenceScopes);
		taskItem.setText(mainTab.getTitle());
		final Control taskTagsControl = mainTab.createContents(fTabFolder);
		taskItem.setControl(taskTagsControl);

		TabItem exclusionItem = new TabItem(fTabFolder, SWT.NONE);
		ExclusionsTab exclusionsTab = new ExclusionsTab(this, fPreferencesService, preferenceScopes);
		exclusionItem.setText(exclusionsTab.getTitle());
		final Control exclusionControl = exclusionsTab.createContents(fTabFolder);
		exclusionItem.setControl(exclusionControl);

		fTabs = new IPreferenceTab[]{mainTab, exclusionsTab};

		fTabEnablementListener = new SelectionAdapter() {
			ControlEnableState[] lastEnableStates = null;

			public void widgetSelected(SelectionEvent e) {
				fEnableTaskTags = fEnableCheckbox.getSelection();
				if (fEnableTaskTags) {
					if (lastEnableStates != null) {
						for (int i = 0; i < lastEnableStates.length; i++) {
							if (lastEnableStates[i] != null) {
								lastEnableStates[i].restore();
							}
						}
						lastEnableStates = null;
						fTabFolder.redraw();
					}
				}
				else if (lastEnableStates == null) {
					lastEnableStates = new ControlEnableState[fTabs.length + 1];
					lastEnableStates[0] = ControlEnableState.disable(taskTagsControl);
					lastEnableStates[1] = ControlEnableState.disable(exclusionControl);
					if (fRedetectButton != null) {
						lastEnableStates[2] = ControlEnableState.disable(fRedetectButton);
					}
				}
			}
		};
		fTabEnablementListener.widgetSelected(null);
		fEnableCheckbox.addSelectionListener(fTabEnablementListener);

		// restore last selected tab
		int activeTab = new DefaultScope().getNode(getPreferenceNodeQualifier()).getInt(TASK_TAG_LAST_TAB, 0);
		if (activeTab > 0) {
			fTabFolder.setSelection(activeTab);
		}

		SSEUIPlugin.getDefault().getWorkbench().getHelpSystem().setHelp(composite, IHelpContextIds.PREFWEBX_TASKTAGS_HELPID);
		return composite;
	}

	protected String getPreferenceNodeQualifier() {
		return TaskTagPreferenceKeys.TASK_TAG_NODE;
	}

	protected String getPreferencePageID() {
		return "org.eclipse.wst.sse.ui.preferences.tasktags";//$NON-NLS-1$

	}

	protected String getProjectSettingsKey() {
		return TaskTagPreferenceKeys.TASK_TAG_PER_PROJECT;
	}

	protected String getPropertyPageID() {
		return "org.eclipse.wst.sse.ui.project.properties.tasktags";//$NON-NLS-1$
	}

	public String getTitle() {
		return SSEUIMessages.TaskTagPreferenceTab_20; //$NON-NLS-1$
	}

	public void init(IWorkbench workbench) {
	}

	public void performApply() {
		super.performApply();
		save();

		for (int i = 0; i < fTabs.length; i++) {
			fTabs[i].performApply();
		}

		promptForRedetectIfNecessary();
	}

	public void performDefaults() {
		super.performDefaults();
		IEclipsePreferences defaultPreferences = createPreferenceScopes()[1].getNode(getPreferenceNodeQualifier());
		fEnableTaskTags = defaultPreferences.getBoolean(TaskTagPreferenceKeys.TASK_TAG_ENABLE, false);
		fEnableCheckbox.setSelection(fEnableTaskTags);
		for (int i = 0; i < fTabs.length; i++) {
			fTabs[i].performDefaults();
		}
		fTabEnablementListener.widgetSelected(null);
		if (_debugPreferences) {
			System.out.println("Loading defaults in " + getClass().getName()); //$NON-NLS-1$
		}
	}

	public boolean performOk() {
		boolean ok = super.performOk();
		save();

		for (int i = 0; i < fTabs.length; i++) {
			fTabs[i].performOk();
		}

		promptForRedetectIfNecessary();

		// save last tab (use Default scope since it won't be persisted)
		new DefaultScope().getNode(getPreferenceNodeQualifier()).putInt(TASK_TAG_LAST_TAB, fTabFolder.getSelectionIndex());

		IScopeContext[] contexts = createPreferenceScopes();
		// remove project-specific information if it's not enabled
		if (getProject() != null && !isElementSettingsEnabled()) {
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " removing " + TaskTagPreferenceKeys.TASK_TAG_PER_PROJECT + " (" + true + ") in scope " + contexts[0].getName() + ":" + contexts[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$  
			}
			contexts[0].getNode(getPreferenceNodeQualifier()).remove(TaskTagPreferenceKeys.TASK_TAG_PER_PROJECT);
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " removing " + TaskTagPreferenceKeys.TASK_TAG_CONTENTTYPES_IGNORED + " (" + true + ") in scope " + contexts[0].getName() + ":" + contexts[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$  
			}
			contexts[0].getNode(getPreferenceNodeQualifier()).remove(TaskTagPreferenceKeys.TASK_TAG_CONTENTTYPES_IGNORED);
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " removing " + TaskTagPreferenceKeys.TASK_TAG_PRIORITIES + " (" + true + ") in scope " + contexts[0].getName() + ":" + contexts[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$  
			}
			contexts[0].getNode(getPreferenceNodeQualifier()).remove(TaskTagPreferenceKeys.TASK_TAG_PRIORITIES);
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " removing " + TaskTagPreferenceKeys.TASK_TAG_TAGS + " (" + true + ") in scope " + contexts[0].getName() + ":" + contexts[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$  
			}
			contexts[0].getNode(getPreferenceNodeQualifier()).remove(TaskTagPreferenceKeys.TASK_TAG_TAGS);
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " removing " + TaskTagPreferenceKeys.TASK_TAG_ENABLE + " (" + true + ") in scope " + contexts[0].getName() + ":" + contexts[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$  
			}
			contexts[0].getNode(getPreferenceNodeQualifier()).remove(TaskTagPreferenceKeys.TASK_TAG_ENABLE);
		}
		for (int i = 0; i < contexts.length; i++) {
			try {
				contexts[i].getNode(getPreferenceNodeQualifier()).flush();
			}
			catch (BackingStoreException e) {
				Logger.logException("problem saving preference settings to scope " + contexts[i].getName(), e); //$NON-NLS-1$
			}
		}

		return ok;
	}


	private void promptForRedetectIfNecessary() {
		if (detectionRequested > 0) {
			MessageDialog dialog = new MessageDialog(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), SSEUIMessages.TaskTagPreferenceTab_22, PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell().getImage(), SSEUIMessages.TaskTagPreferenceTab_23, MessageDialog.QUESTION, new String[]{SSEUIMessages.TaskTagPreferenceTab_24, SSEUIMessages.TaskTagPreferenceTab_25, SSEUIMessages.TaskTagPreferenceTab_26}, 2); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
			int button = dialog.open();
			if (button == 0) {
				Job redetectJob = new Job(SSEUIMessages.TaskTagPreferenceTab_27) { //$NON-NLS-1$
					public Object getAdapter(Class adapter) {
						return null;
					}

					protected IStatus run(IProgressMonitor monitor) {
						if (getProject() == null) {
							if (_debugPreferences) {
								System.out.println(getClass().getName() + ": rescanning all"); //$NON-NLS-1$
							}
							TaskScanningScheduler.refresh();
						}
						else {
							if (_debugPreferences) {
								System.out.println(getClass().getName() + ": rescanning " + getProject()); //$NON-NLS-1$
							}
							TaskScanningScheduler.refresh(getProject());
						}
						return Status.OK_STATUS;
					}
				};
				redetectJob.schedule(500);
			}
			detectionRequested = 0;
		}
	}

	void requestRedetection() {
		detectionRequested++;
	}

	private void save() {
		if (fEnableTaskTags != fOriginalEnableTaskTags) {
			requestRedetection();
		}
		fOriginalEnableTaskTags = fEnableTaskTags;

		IScopeContext[] preferenceScopes = createPreferenceScopes();
		IEclipsePreferences defaultPreferences = preferenceScopes[1].getNode(getPreferenceNodeQualifier());
		boolean defaultEnable = defaultPreferences.getBoolean(TaskTagPreferenceKeys.TASK_TAG_ENABLE, false);
		if (fEnableTaskTags == defaultEnable) {
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " removing " + TaskTagPreferenceKeys.TASK_TAG_ENABLE + " from scope " + preferenceScopes[0].getName() + ":" + preferenceScopes[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
			}
			preferenceScopes[0].getNode(getPreferenceNodeQualifier()).remove(TaskTagPreferenceKeys.TASK_TAG_ENABLE);
		}
		else {
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " setting " + TaskTagPreferenceKeys.TASK_TAG_ENABLE + " \"" + fEnableTaskTags + "\" in scope " + preferenceScopes[0].getName() + ":" + preferenceScopes[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
			}
			preferenceScopes[0].getNode(getPreferenceNodeQualifier()).putBoolean(TaskTagPreferenceKeys.TASK_TAG_ENABLE, fEnableTaskTags);
		}
		if (getProject() != null && isElementSettingsEnabled()) {
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " setting " + TaskTagPreferenceKeys.TASK_TAG_PER_PROJECT + " (" + true + ") in scope " + preferenceScopes[0].getName() + ":" + preferenceScopes[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$  
			}
			preferenceScopes[0].getNode(getPreferenceNodeQualifier()).putBoolean(TaskTagPreferenceKeys.TASK_TAG_PER_PROJECT, true);
		}
		else {
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " removing " + TaskTagPreferenceKeys.TASK_TAG_PER_PROJECT + " from scope " + preferenceScopes[0].getName() + ":" + preferenceScopes[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
			}
			preferenceScopes[0].getNode(getPreferenceNodeQualifier()).remove(TaskTagPreferenceKeys.TASK_TAG_PER_PROJECT);
		}
		try {
			fPreferencesService.getRootNode().flush();
		}
		catch (BackingStoreException e) {
			// log it, there is no recovery
			Logger.logException(e);
		}
	}
}