/*******************************************************************************
 * 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
 *     
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.preferences.ui;

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

import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.core.runtime.content.IContentTypeManager;
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.viewers.CheckboxTreeViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
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.wst.sse.core.internal.SSECorePlugin;
import org.eclipse.wst.sse.core.internal.tasks.FileTaskScannerRegistryReader;
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 org.eclipse.wst.sse.ui.internal.util.Sorter;

import com.ibm.icu.text.Collator;

class ExclusionsTab implements IPreferenceTab {
	private class ArrayTreeContentProvider implements ITreeContentProvider {
		public ArrayTreeContentProvider() {
			super();
		}

		public void dispose() {
		}

		public Object[] getChildren(Object parentElement) {
			if (parentElement instanceof Object[])
				return fContentTypeSorter.sort((Object[]) parentElement);
			return new Object[0];
		}

		public Object[] getElements(Object inputElement) {
			return getChildren(inputElement);
		}

		public Object getParent(Object element) {
			return null;
		}

		public boolean hasChildren(Object element) {
			return getChildren(element).length > 0;
		}

		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		}
	}

	private class ContentTypeLabelProvider extends LabelProvider {
		public String getText(Object element) {
			if (element != null) {
				Object o = element;
				if (o instanceof String) {
					o = fContentTypeManager.getContentType(o.toString());
				}
				if (o instanceof IContentType) {
					return ((IContentType) o).getName();
				}
			}
			return super.getText(element);
		}
	}

	/**
	 * A QuickSorter that sorts and returns a IContentType-typed array
	 */
	private class ContentTypeSorter extends Sorter {
		private Collator collator = Collator.getInstance(Locale.ENGLISH);

		public boolean compare(Object elementOne, Object elementTwo) {
			return (collator.compare(((IContentType) elementOne).getName(), ((IContentType) elementTwo).getName())) < 0;
		}

		public Object[] sort(Object[] unSortedCollection) {
			Object[] types = super.sort(unSortedCollection);
			IContentType[] sortedTypes = new IContentType[types.length];
			if (types.length > 0) {
				System.arraycopy(types, 0, sortedTypes, 0, sortedTypes.length);
			}
			return sortedTypes;
		}
	}

	private class ContentTypeTreeProvider implements ITreeContentProvider {
		public ContentTypeTreeProvider() {
			super();
		}

		public void dispose() {
		}

		boolean equals(Object left, Object right) {
			return left == null ? right == null : ((right != null) && left.equals(right));
		}

		public Object[] getChildren(Object parentElement) {
			if (parentElement instanceof Object[]) {
				return (Object[]) parentElement;
			}
			if (parentElement instanceof IContentType) {
				List elements = new ArrayList(0);
				IContentType[] allTypes = fContentTypeManager.getAllContentTypes();
				for (int i = 0; i < allTypes.length; i++) {
					if (!fSupportedContentTypes.contains(allTypes[i]) && equals(allTypes[i].getBaseType(), parentElement)) {
						elements.add(allTypes[i]);
					}
				}
				return fContentTypeSorter.sort(elements.toArray());
			}
			return new Object[0];
		}

		public Object[] getElements(Object inputElement) {
			return getChildren(inputElement);
		}

		public Object getParent(Object element) {
			Object parent = null;
			if (element instanceof IContentType) {
				parent = ((IContentType) element).getBaseType();
			}
			return parent;
		}

		public boolean hasChildren(Object element) {
			return getChildren(element).length > 0;
		}

		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		}
	}

	/**
	 * A QuickSorter that sorts and returns a String-typed array
	 */
	private class StringSorter extends Sorter {
		Collator collator = Collator.getInstance(Locale.ENGLISH);

		public boolean compare(Object elementOne, Object elementTwo) {
			return (collator.compare(elementOne.toString(), elementTwo.toString()) < 0);
		}

		public Object[] sort(Object[] unSortedCollection) {
			Object[] sortedCollection = super.sort(unSortedCollection);
			String[] strings = new String[sortedCollection.length];
			// copy the array so can return a new sorted collection
			if (strings.length > 0) {
				System.arraycopy(sortedCollection, 0, strings, 0, strings.length);
			}
			return strings;
		}
	}

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

	private CheckboxTreeViewer fContentTypeList;

	private IContentTypeManager fContentTypeManager = null;

	ContentTypeSorter fContentTypeSorter = new ContentTypeSorter();

	private IContentType[] fIgnoreContentTypes = null;

	private IContentType[] fOriginalIgnoreContentTypes = null;

	private TaskTagPreferencePage fOwner = null;

	private IScopeContext[] fPreferencesLookupOrder = null;

	private IPreferencesService fPreferencesService = null;

	private List fSupportedContentTypes = null;

	public ExclusionsTab(TaskTagPreferencePage parent, IPreferencesService preferencesService, IScopeContext[] lookupOrder) {
		super();
		fOwner = parent;
		fPreferencesLookupOrder = lookupOrder;
		fPreferencesService = preferencesService;
		fContentTypeManager = Platform.getContentTypeManager();

		String[] supportedContentTypeIDs = FileTaskScannerRegistryReader.getInstance().getSupportedContentTypeIds();
		fSupportedContentTypes = new ArrayList(supportedContentTypeIDs.length);
		for (int i = 0; i < supportedContentTypeIDs.length; i++) {
			IContentType type = fContentTypeManager.getContentType(supportedContentTypeIDs[i]);
			if (type != null) {
				fSupportedContentTypes.add(type);
			}
		}
		String[] ignoreContentTypes = StringUtils.unpack(fPreferencesService.getString(TaskTagPreferenceKeys.TASK_TAG_NODE, TaskTagPreferenceKeys.TASK_TAG_CONTENTTYPES_IGNORED, SSECorePlugin.getDefault().getPluginPreferences().getDefaultString(TaskTagPreferenceKeys.TASK_TAG_CONTENTTYPES_IGNORED), fPreferencesLookupOrder));
		List contentTypes = new ArrayList();
		for (int i = 0; i < ignoreContentTypes.length; i++) {
			IContentType type = fContentTypeManager.getContentType(ignoreContentTypes[i]);
			if (type != null) {
				contentTypes.add(type);
			}
		}
		fOriginalIgnoreContentTypes = fIgnoreContentTypes = (IContentType[]) contentTypes.toArray(new IContentType[contentTypes.size()]);
	}

	public Control createContents(Composite tabFolder) {
		SashForm sash = new SashForm(tabFolder, SWT.VERTICAL);
		Composite composite = new Composite(sash, SWT.NONE);
		composite.setLayout(new GridLayout(2, true));
		Label description = new Label(composite, SWT.NONE);
		description.setText(SSEUIMessages.TaskTagExclusionTab_02);
//		description.setBackground(composite.getBackground());

		fContentTypeList = new CheckboxTreeViewer(composite, SWT.SINGLE | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
		fContentTypeList.setLabelProvider(new ContentTypeLabelProvider());
		fContentTypeList.setContentProvider(new ArrayTreeContentProvider());

		fContentTypeList.setInput(fSupportedContentTypes.toArray());
		fContentTypeList.setCheckedElements(fSupportedContentTypes.toArray());
		fContentTypeList.getTree().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1));
		for (int i = 0; i < fIgnoreContentTypes.length; i++) {
			fContentTypeList.setChecked(fIgnoreContentTypes[i], false);
		}

		Button selectAll = new Button(composite, SWT.PUSH);
		selectAll.setText(SSEUIMessages.TaskTagPreferenceTab_17);
		selectAll.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false, 1, 1));
		selectAll.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				fContentTypeList.setCheckedElements(fSupportedContentTypes.toArray());
			}
		});

		Button selectNone = new Button(composite, SWT.PUSH);
		selectNone.setText(SSEUIMessages.TaskTagPreferenceTab_18);
		selectNone.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false, 1, 1));
		selectNone.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				fContentTypeList.setCheckedElements(new Object[0]);
			}
		});

		composite = new Composite(sash, SWT.NONE);
		composite.setLayout(new GridLayout(2, true));
		new Label(composite, SWT.NONE).setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));

		Label affectedTypesLabel = new Label(composite, SWT.NONE);
		affectedTypesLabel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
//		affectedTypesLabel.setBackground(composite.getBackground());
		affectedTypesLabel.setText(SSEUIMessages.TaskTagExclusionTab_03);

		final TreeViewer contentTypeTreeViewer = new TreeViewer(composite, SWT.SINGLE | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
		contentTypeTreeViewer.setLabelProvider(new ContentTypeLabelProvider());
		contentTypeTreeViewer.setContentProvider(new ContentTypeTreeProvider());
		contentTypeTreeViewer.setInput(new Object[0]);
		contentTypeTreeViewer.getTree().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1));

		fContentTypeList.addSelectionChangedListener(new ISelectionChangedListener() {
			public void selectionChanged(SelectionChangedEvent event) {
				if (event.getSelection() instanceof IStructuredSelection) {
					Object[] o = ((IStructuredSelection) event.getSelection()).toArray();
					contentTypeTreeViewer.setInput(o);
					contentTypeTreeViewer.expandAll();
					if (o.length > 0) {
						contentTypeTreeViewer.reveal(o[0]);
					}
				}
			}
		});

		return sash;
	}

	public String getTitle() {
		return SSEUIMessages.TaskTagExclusionTab_01;
	}

	public void performApply() {
		save();
	}

	public void performDefaults() {
		if (_debugPreferences) {
			System.out.println("Loading defaults in " + getClass().getName()); //$NON-NLS-1$
		}
		IEclipsePreferences[] defaultPreferences = new IEclipsePreferences[fPreferencesLookupOrder.length - 1];
		for (int i = 1; i < defaultPreferences.length; i++) {
			defaultPreferences[i - 1] = fPreferencesLookupOrder[i].getNode(TaskTagPreferenceKeys.TASK_TAG_NODE);
		}
		String[] defaultIgnoreTypes = StringUtils.unpack(fPreferencesService.get(TaskTagPreferenceKeys.TASK_TAG_CONTENTTYPES_IGNORED, null, defaultPreferences)); //$NON-NLS-1$

		List contentTypes = new ArrayList();
		for (int i = 0; i < defaultIgnoreTypes.length; i++) {
			IContentType type = fContentTypeManager.getContentType(defaultIgnoreTypes[i]);
			if (type != null) {
				contentTypes.add(type);
			}
		}
		fIgnoreContentTypes = (IContentType[]) contentTypes.toArray(new IContentType[contentTypes.size()]);
		fContentTypeList.setCheckedElements(fContentTypeManager.getAllContentTypes());
		for (int i = 0; i < fIgnoreContentTypes.length; i++) {
			fContentTypeList.setChecked(fIgnoreContentTypes[i], false);
		}
	}

	public void performOk() {
		List ignoredIds = save();
		String[] ignoreIDs = (String[]) new StringSorter().sort(ignoredIds.toArray());
		fIgnoreContentTypes = new IContentType[ignoreIDs.length];
		for (int i = 0; i < ignoreIDs.length; i++) {
			fIgnoreContentTypes[i] = fContentTypeManager.getContentType(ignoreIDs[i]);
		}

		if (!Arrays.equals(fOriginalIgnoreContentTypes, fIgnoreContentTypes)) {
			fOwner.requestRedetection();
		}
		fOriginalIgnoreContentTypes = fIgnoreContentTypes;
	}

	private List save() {
		List ignoredIds = new ArrayList();
		List checked = Arrays.asList(fContentTypeList.getCheckedElements());
		for (int i = 0; i < fSupportedContentTypes.size(); i++) {
			if (!checked.contains(fSupportedContentTypes.get(i))) {
				ignoredIds.add(((IContentType) fSupportedContentTypes.get(i)).getId());
			}
		}
		IEclipsePreferences[] defaultPreferences = new IEclipsePreferences[fPreferencesLookupOrder.length - 1];
		for (int i = 1; i < defaultPreferences.length; i++) {
			defaultPreferences[i - 1] = fPreferencesLookupOrder[i].getNode(TaskTagPreferenceKeys.TASK_TAG_NODE);
		}

		String defaultIgnoredContentTypeIds = StringUtils.pack((String[]) new StringSorter().sort(StringUtils.unpack(fPreferencesService.get(TaskTagPreferenceKeys.TASK_TAG_CONTENTTYPES_IGNORED, "", defaultPreferences)))); //$NON-NLS-1$
		String ignoredContentTypeIds = StringUtils.pack((String[]) new StringSorter().sort(ignoredIds.toArray()));
		if (ignoredContentTypeIds.equals(defaultIgnoredContentTypeIds)) {
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " removing " + TaskTagPreferenceKeys.TASK_TAG_CONTENTTYPES_IGNORED + " 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_CONTENTTYPES_IGNORED);
		}
		else {
			if (_debugPreferences) {
				System.out.println(getClass().getName() + " setting " + TaskTagPreferenceKeys.TASK_TAG_CONTENTTYPES_IGNORED + " \"" + ignoredContentTypeIds + "\" 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_CONTENTTYPES_IGNORED, ignoredContentTypeIds);
		}
		return ignoredIds;
	}
}