/*******************************************************************************
 * Copyright (c) 2001, 2010 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
 *	   David Schneider, david.schneider@unisys.com - [142500] WTP properties pages fonts don't follow Eclipse preferences
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.preferences.ui;

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

import org.eclipse.core.resources.IMarker;
import org.eclipse.core.runtime.Platform;
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.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ColumnWeightData;
import org.eclipse.jface.viewers.DoubleClickEvent;
import org.eclipse.jface.viewers.IDoubleClickListener;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TableLayout;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.Text;
import org.eclipse.wst.sse.core.internal.provisional.tasks.TaskTag;
import org.eclipse.wst.sse.core.internal.tasks.TaskTagPreferenceKeys;
import org.eclipse.wst.sse.core.utils.StringUtils;
import org.eclipse.wst.sse.ui.internal.SSEUIMessages;

import com.ibm.icu.util.StringTokenizer;

class MainTab implements IPreferenceTab {
	public class TaskTagDialog extends Dialog {
		public TaskTag taskTag = null;

		Combo priorityCombo = null;
		Text tagText = null;

		public TaskTagDialog(Shell parentShell) {
			super(parentShell);
			setShellStyle(getShellStyle() | SWT.RESIZE);
		}

		protected void configureShell(Shell newShell) {
			super.configureShell(newShell);
			newShell.setText(SSEUIMessages.TaskTagPreferenceTab_5); //$NON-NLS-1$
		}

		protected Control createButtonBar(Composite parent) {
			Control c = super.createButtonBar(parent);
			getButton(IDialogConstants.OK_ID).setEnabled(taskTag == null || taskTag.getTag().length() > 0);
			return c;
		}

		protected Control createDialogArea(Composite parent) {
			Composite composite = new Composite(parent, SWT.NONE);
			composite.setLayout(new GridLayout(2, false));
			GridData gridData = new GridData(GridData.FILL_BOTH);
			gridData.widthHint = parent.getDisplay().getClientArea().width / 5;
			composite.setLayoutData(gridData);
			Label label = new Label(composite, SWT.NONE);
			label.setText(SSEUIMessages.TaskTagPreferenceTab_6); //$NON-NLS-1$
			label.setLayoutData(new GridData());
			tagText = new Text(composite, SWT.BORDER);
			tagText.setText(taskTag != null ? taskTag.getTag() : ""); //$NON-NLS-1$
			tagText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
			tagText.addModifyListener(new ModifyListener() {
				public void modifyText(ModifyEvent e) {
					String testTag = tagText.getText();
					String[] tags = new String[fTaskTags.length];
					for (int i = 0; i < tags.length; i++) {
						tags[i] = fTaskTags[i].getTag();
					}
					getButton(IDialogConstants.OK_ID).setEnabled(tagText.getText().length() > 0 && !Arrays.asList(tags).contains(testTag));
					taskTag = new TaskTag(tagText.getText(), priorityCombo.getSelectionIndex());
				}
			});

			label = new Label(composite, SWT.NONE);
			label.setText(SSEUIMessages.TaskTagPreferenceTab_7); //$NON-NLS-1$
			label.setLayoutData(new GridData());
			priorityCombo = new Combo(composite, SWT.READ_ONLY | SWT.SINGLE);
			priorityCombo.setItems(new String[]{SSEUIMessages.TaskTagPreferenceTab_0, SSEUIMessages.TaskTagPreferenceTab_1, SSEUIMessages.TaskTagPreferenceTab_2});
			priorityCombo.select(taskTag != null ? taskTag.getPriority() : TaskTag.PRIORITY_NORMAL);
			priorityCombo.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
			priorityCombo.addSelectionListener(new SelectionAdapter() {
				public void widgetSelected(SelectionEvent e) {
					taskTag = new TaskTag(taskTag.getTag(), priorityCombo.getSelectionIndex());
				}
			});
		    Dialog.applyDialogFont(parent);
			return composite;
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.jface.dialogs.Dialog#okPressed()
		 */
		protected void okPressed() {
			taskTag = new TaskTag(tagText.getText(), priorityCombo.getSelectionIndex());
			super.okPressed();
		}
	}

	public class TaskTagTableLabelProvider extends LabelProvider implements ITableLabelProvider {
		public TaskTagTableLabelProvider() {
			super();
		}

		public Image getColumnImage(Object element, int columnIndex) {
			return null;
		}

		public String getColumnText(Object element, int columnIndex) {
			if (columnIndex < 1)
				return ((TaskTag) element).getTag();
			for (int i = 0; i < fTaskTags.length; i++) {
				if (fTaskTags[i].equals(element)) {
					if (fTaskTags[i].getPriority() == IMarker.PRIORITY_LOW) {
						return SSEUIMessages.TaskTagPreferenceTab_0; //$NON-NLS-1$
					}
					else if (fTaskTags[i].getPriority() == IMarker.PRIORITY_HIGH) {
						return SSEUIMessages.TaskTagPreferenceTab_2; //$NON-NLS-1$
					}
					else {
						return SSEUIMessages.TaskTagPreferenceTab_1; //$NON-NLS-1$
					}
				}
			}
			return SSEUIMessages.TaskTagPreferenceTab_3; //$NON-NLS-1$
		}
	}

	private static final boolean _debugPreferences = "true".equalsIgnoreCase(Platform.getDebugOption("org.eclipse.wst.sse.core/tasks/preferences")); //$NON-NLS-1$ //$NON-NLS-2$

	private Control fControl;

	private TaskTag[] fOriginalTaskTags;
	private TaskTagPreferencePage fOwner = null;
	private IScopeContext[] fPreferencesLookupOrder = null;

	private IPreferencesService fPreferencesService = null;

	private TaskTag[] fTaskTags;

	private TableViewer valueTable = null;


	public MainTab(TaskTagPreferencePage parent, IPreferencesService preferencesService, IScopeContext[] lookupOrder) {
		super();
		fOwner = parent;
		fPreferencesLookupOrder = lookupOrder;
		fPreferencesService = preferencesService;
	}


	private void addTag() {
		TaskTagDialog dlg = new TaskTagDialog(fControl.getShell());
		int result = dlg.open();
		if (result == Window.OK) {
			TaskTag newTag = dlg.taskTag;
			List newTags = new ArrayList(Arrays.asList(fTaskTags));
			newTags.add(newTag);
			fTaskTags = (TaskTag[]) newTags.toArray(new TaskTag[newTags.size()]);
			valueTable.setInput(fTaskTags);
			valueTable.getTable().setSelection(fTaskTags.length - 1);
		}
	}

	public Control createContents(Composite tabFolder) {
		loadPreferenceValues();
		fOriginalTaskTags = fTaskTags;

		Composite composite = new Composite(tabFolder, SWT.NONE);
		composite.setLayout(new GridLayout(2, false));
		fControl = composite;

		Label description = new Label(composite, SWT.NONE);
		description.setText(SSEUIMessages.TaskTagPreferenceTab_33); //$NON-NLS-1$
//		description.setBackground(composite.getBackground());
		GridData gd = new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1);
		// https://bugs.eclipse.org/bugs/show_bug.cgi?id=104403
		Point sizeHint = description.computeSize(SWT.DEFAULT, SWT.DEFAULT);
		gd.widthHint = sizeHint.x;
		description.setLayoutData(gd);

		valueTable = new TableViewer(composite, SWT.BORDER | SWT.MULTI | SWT.FULL_SELECTION | SWT.H_SCROLL | SWT.V_SCROLL);
		valueTable.getControl().setLayoutData(new GridData(GridData.FILL_BOTH));
		TableColumn textColumn = new TableColumn(valueTable.getTable(), SWT.NONE, 0);
		textColumn.setText(SSEUIMessages.TaskTagPreferenceTab_12); //$NON-NLS-1$
		TableColumn priorityColumn = new TableColumn(valueTable.getTable(), SWT.NONE, 1);
		priorityColumn.setText(SSEUIMessages.TaskTagPreferenceTab_13); //$NON-NLS-1$
		valueTable.setContentProvider(new ArrayContentProvider());
		valueTable.setLabelProvider(new TaskTagTableLabelProvider());
		valueTable.getTable().setLinesVisible(true);
		valueTable.getTable().setHeaderVisible(true);
		TableLayout layout = new TableLayout();
		layout.addColumnData(new ColumnWeightData(1, 140, true));
		layout.addColumnData(new ColumnWeightData(1, 140, true));
		valueTable.getTable().setLayout(layout);

		Composite buttons = new Composite(composite, SWT.NONE);
		buttons.setLayout(new GridLayout());
		buttons.setLayoutData(new GridData(GridData.FILL_VERTICAL));

		final Button addButton = new Button(buttons, SWT.PUSH);
		addButton.setText(SSEUIMessages.TaskTagPreferenceTab_14); //$NON-NLS-1$
		addButton.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
		final Button editButton = new Button(buttons, SWT.PUSH);
		editButton.setText(SSEUIMessages.TaskTagPreferenceTab_15); //$NON-NLS-1$
		editButton.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
		final Button removeButton = new Button(buttons, SWT.PUSH);
		removeButton.setText(SSEUIMessages.TaskTagPreferenceTab_16); //$NON-NLS-1$
		removeButton.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		editButton.setEnabled(false);
		removeButton.setEnabled(false);

		Label warning = new Label(composite, SWT.NONE);
		warning.setLayoutData(new GridData());
		warning.setText(SSEUIMessages.TaskTagPreferenceTab_19); //$NON-NLS-1$

		final ISelectionChangedListener selectionChangedListener = new ISelectionChangedListener() {
			public void selectionChanged(SelectionChangedEvent event) {
				ISelection selection = valueTable.getSelection();
				editButton.setEnabled(((IStructuredSelection) selection).size() == 1);
				removeButton.setEnabled(!selection.isEmpty());
			}
		};
		valueTable.addPostSelectionChangedListener(selectionChangedListener);
		addButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				addTag();
				valueTable.getTable().setSelection(fTaskTags.length - 1);
				selectionChangedListener.selectionChanged(null);
			}
		});
		editButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				int i = valueTable.getTable().getSelectionIndex();
				editTag(i);
				if (i >= 0) {
					valueTable.getTable().setSelection(i);
					selectionChangedListener.selectionChanged(null);
				}
			}
		});
		removeButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				int i = valueTable.getTable().getSelectionIndex();
				removeTags(valueTable.getSelection());
				if (i >= 0 && i < fTaskTags.length) {
					valueTable.getTable().setSelection(i);
				}
			}
		});
		valueTable.addDoubleClickListener(new IDoubleClickListener() {
			public void doubleClick(DoubleClickEvent event) {
				int i = valueTable.getTable().getSelectionIndex();
				editTag(i);
				if (i >= 0) {
					valueTable.getTable().setSelection(i);
					selectionChangedListener.selectionChanged(null);
				}
			}
		});

		valueTable.setInput(fTaskTags);

		return composite;
	}

	/**
	 * @param selection
	 */
	private void editTag(int i) {
		if (i < 0) {
			return;
		}

		int selection = valueTable.getTable().getSelectionIndex();
		TaskTagDialog dlg = new TaskTagDialog(fControl.getShell());
		dlg.taskTag = fTaskTags[selection];
		int result = dlg.open();
		if (result == Window.OK) {
			fTaskTags[selection] = dlg.taskTag;
			valueTable.refresh();
		}
	}

	public String getTitle() {
		return SSEUIMessages.TaskTagPreferenceTab_20;
	}

	private void loadPreferenceValues() {
		String tags = fPreferencesService.getString(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_TAGS, "", fPreferencesLookupOrder); //$NON-NLS-1$
		String priorities = fPreferencesService.getString(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_PRIORITIES, "", fPreferencesLookupOrder); //$NON-NLS-1$
		loadTagsAndPrioritiesFrom(tags, priorities);
	}

	/**
	 * @param tags
	 * @param priorities
	 */
	private void loadTagsAndPrioritiesFrom(String tagString, String priorityString) {
		String[] tags = StringUtils.unpack(tagString);

		StringTokenizer toker = null;
		List list = new ArrayList();

		toker = new StringTokenizer(priorityString, ","); //$NON-NLS-1$
		while (toker.hasMoreTokens()) {
			Integer number = null;
			try {
				number = Integer.valueOf(toker.nextToken());
			}
			catch (NumberFormatException e) {
				number = new Integer(IMarker.PRIORITY_NORMAL);
			}
			list.add(number);
		}
		Integer[] priorities = (Integer[]) list.toArray(new Integer[0]);

		fTaskTags = new TaskTag[Math.min(tags.length, priorities.length)];
		for (int i = 0; i < fTaskTags.length; i++) {
			fTaskTags[i] = new TaskTag(tags[i], priorities[i].intValue());
		}
	}

	public void performApply() {
		save();

		if (!Arrays.equals(fOriginalTaskTags, fTaskTags)) {
			fOwner.requestRedetection();
		}
		fOriginalTaskTags = fTaskTags;
	}

	public void performDefaults() {
		if (_debugPreferences) {
			System.out.println("Loading defaults in " + getClass().getName()); //$NON-NLS-1$
		}
		IEclipsePreferences[] preferences = new IEclipsePreferences[fPreferencesLookupOrder.length];
		for (int i = 0; i < preferences.length; i++) {
			preferences[i] = fPreferencesLookupOrder[i].getNode(TaskTagPreferenceKeys.TASK_TAG_NODE);
		}
		String tags = fPreferencesService.get(TaskTagPreferenceKeys.TASK_TAG_TAGS, null, preferences);
		String priorities = fPreferencesService.get(TaskTagPreferenceKeys.TASK_TAG_PRIORITIES, null, preferences);
		loadTagsAndPrioritiesFrom(tags, priorities);
		int selection = valueTable.getTable().getSelectionIndex();
		valueTable.setInput(fTaskTags);
		valueTable.getTable().setSelection(selection);
	}

	public void performOk() {
		performApply();
	}

	/**
	 * @param selection
	 */
	private void removeTags(ISelection selection) {
		IStructuredSelection structuredSelection = (IStructuredSelection) selection;
		List taskTags = new ArrayList(Arrays.asList(fTaskTags));
		taskTags.removeAll(structuredSelection.toList());
		fTaskTags = (TaskTag[]) taskTags.toArray(new TaskTag[taskTags.size()]);
		valueTable.setInput(fTaskTags);
	}

	private void save() {
		IEclipsePreferences defaultPreferences = new DefaultScope().getNode(TaskTagPreferenceKeys.TASK_TAG_NODE);
		String defaultTags = defaultPreferences.get(TaskTagPreferenceKeys.TASK_TAG_TAGS, null);
		String defaultPriorities = defaultPreferences.get(TaskTagPreferenceKeys.TASK_TAG_PRIORITIES, null);

		StringBuffer buf = new StringBuffer();
		for (int i = 0; i < fTaskTags.length; i++) {
			if (i > 0) {
				buf.append(","); //$NON-NLS-1$
			}
			buf.append(fTaskTags[i].getTag());
		}
		String currentTags = buf.toString();
		if (currentTags.equals(defaultTags) && !fPreferencesLookupOrder[0].getName().equals(DefaultScope.SCOPE)) {
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " removing " + TaskTagPreferenceKeys.TASK_TAG_TAGS + " from scope " + fPreferencesLookupOrder[0].getName() + ":" + fPreferencesLookupOrder[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
			}
			fPreferencesLookupOrder[0].getNode(TaskTagPreferenceKeys.TASK_TAG_NODE).remove(TaskTagPreferenceKeys.TASK_TAG_TAGS);
		}
		else {
			fOwner.requestRedetection();
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " setting " + TaskTagPreferenceKeys.TASK_TAG_TAGS + " \"" + currentTags + "\" in scope " + fPreferencesLookupOrder[0].getName() + ":" + fPreferencesLookupOrder[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
			}
			fPreferencesLookupOrder[0].getNode(TaskTagPreferenceKeys.TASK_TAG_NODE).put(TaskTagPreferenceKeys.TASK_TAG_TAGS, currentTags);
		}

		StringBuffer buf2 = new StringBuffer();
		for (int i = 0; i < fTaskTags.length; i++) {
			if (i > 0) {
				buf2.append(","); //$NON-NLS-1$
			}
			buf2.append(String.valueOf(fTaskTags[i].getPriority()));
		}
		String priorities = buf2.toString();

		if (priorities.equals(defaultPriorities) && !fPreferencesLookupOrder[0].getName().equals(DefaultScope.SCOPE)) {
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " removing " + TaskTagPreferenceKeys.TASK_TAG_PRIORITIES + " from scope " + fPreferencesLookupOrder[0].getName() + ":" + fPreferencesLookupOrder[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
			}
			fPreferencesLookupOrder[0].getNode(TaskTagPreferenceKeys.TASK_TAG_NODE).remove(TaskTagPreferenceKeys.TASK_TAG_PRIORITIES);
		}
		else {
			fOwner.requestRedetection();
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " setting " + TaskTagPreferenceKeys.TASK_TAG_PRIORITIES + " \"" + priorities + "\" in scope " + fPreferencesLookupOrder[0].getName() + ":" + fPreferencesLookupOrder[0].getLocation()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
			}
			fPreferencesLookupOrder[0].getNode(TaskTagPreferenceKeys.TASK_TAG_NODE).put(TaskTagPreferenceKeys.TASK_TAG_PRIORITIES, priorities);
		}
	}
}