/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.wizards.buildpath;

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

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.dltk.core.DLTKCore;
import org.eclipse.dltk.core.IModelStatus;
import org.eclipse.dltk.internal.core.BuildpathEntry;
import org.eclipse.dltk.internal.ui.wizards.NewWizardMessages;
import org.eclipse.dltk.internal.ui.wizards.dialogfields.DialogField;
import org.eclipse.dltk.internal.ui.wizards.dialogfields.IDialogFieldListener;
import org.eclipse.dltk.internal.ui.wizards.dialogfields.IListAdapter;
import org.eclipse.dltk.internal.ui.wizards.dialogfields.LayoutUtil;
import org.eclipse.dltk.internal.ui.wizards.dialogfields.ListDialogField;
import org.eclipse.dltk.ui.DLTKPluginImages;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.dltk.ui.dialogs.StatusInfo;
import org.eclipse.dltk.ui.viewsupport.ImageDescriptorRegistry;
import org.eclipse.dltk.ui.wizards.NewElementWizardPage;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Shell;

public class SetFilterWizardPage extends NewElementWizardPage {

	private static final String PAGE_NAME = "SetFilterWizardPage"; //$NON-NLS-1$

	private ListDialogField fInclusionPatternList;
	private ListDialogField fExclusionPatternList;
	private BPListElement fCurrElement;
	private IProject fCurrProject;

	private IContainer fCurrSourceFolder;

	private static final int IDX_ADD = 0;
	private static final int IDX_ADD_MULTIPLE = 1;
	private static final int IDX_EDIT = 2;
	private static final int IDX_REMOVE = 4;

	private final ArrayList fExistingEntries;

	public SetFilterWizardPage(BPListElement entryToEdit,
			ArrayList existingEntries) {
		super(PAGE_NAME);
		fExistingEntries = existingEntries;

		setTitle(NewWizardMessages.ExclusionInclusionDialog_title);
		setDescription(NewWizardMessages.ExclusionInclusionDialog_description2);

		fCurrElement = entryToEdit;
		fCurrProject = entryToEdit.getScriptProject().getProject();
		IWorkspaceRoot root = fCurrProject.getWorkspace().getRoot();
		IResource res = root.findMember(entryToEdit.getPath());
		if (res instanceof IContainer) {
			fCurrSourceFolder = (IContainer) res;
		}

		String excLabel = NewWizardMessages.ExclusionInclusionDialog_exclusion_pattern_label;
		ImageDescriptor excDescriptor = DLTKPluginImages.DESC_OBJS_EXCLUSION_FILTER_ATTRIB;
		String[] excButtonLabels = new String[] {
				NewWizardMessages.ExclusionInclusionDialog_exclusion_pattern_add,
				NewWizardMessages.ExclusionInclusionDialog_exclusion_pattern_add_multiple,
				NewWizardMessages.ExclusionInclusionDialog_exclusion_pattern_edit,
				null,
				NewWizardMessages.ExclusionInclusionDialog_exclusion_pattern_remove };

		String incLabel = NewWizardMessages.ExclusionInclusionDialog_inclusion_pattern_label;
		ImageDescriptor incDescriptor = DLTKPluginImages.DESC_OBJS_INCLUSION_FILTER_ATTRIB;
		String[] incButtonLabels = new String[] {
				NewWizardMessages.ExclusionInclusionDialog_inclusion_pattern_add,
				NewWizardMessages.ExclusionInclusionDialog_inclusion_pattern_add_multiple,
				NewWizardMessages.ExclusionInclusionDialog_inclusion_pattern_edit,
				null,
				NewWizardMessages.ExclusionInclusionDialog_inclusion_pattern_remove };

		fExclusionPatternList = createListContents(entryToEdit,
				BPListElement.EXCLUSION, excLabel, excDescriptor,
				excButtonLabels);
		fInclusionPatternList = createListContents(entryToEdit,
				BPListElement.INCLUSION, incLabel, incDescriptor,
				incButtonLabels);
	}

	@Override
	public void createControl(Composite parent) {
		Composite inner = new Composite(parent, SWT.NONE);
		inner.setFont(parent.getFont());

		GridLayout layout = new GridLayout();
		layout.marginHeight = 0;
		layout.marginWidth = 0;
		layout.numColumns = 2;
		inner.setLayout(layout);
		inner.setLayoutData(new GridData(GridData.FILL_BOTH));

		fInclusionPatternList.doFillIntoGrid(inner, 3);
		LayoutUtil.setHorizontalSpan(
				fInclusionPatternList.getLabelControl(null), 2);
		LayoutUtil.setHorizontalGrabbing(
				fInclusionPatternList.getListControl(null));

		fExclusionPatternList.doFillIntoGrid(inner, 3);
		LayoutUtil.setHorizontalSpan(
				fExclusionPatternList.getLabelControl(null), 2);
		LayoutUtil.setHorizontalGrabbing(
				fExclusionPatternList.getListControl(null));

		setControl(inner);
		Dialog.applyDialogFont(inner);
		if (DLTKCore.DEBUG) {
			System.err.println("SetFilterWizardOage add help support here"); //$NON-NLS-1$
		}
		// PlatformUI.getWorkbench().getHelpSystem().setHelp(inner,
		// IDLTKHelpContextIds.INCLUSION_EXCLUSION_WIZARD_PAGE);
	}

	private static class ExclusionInclusionLabelProvider extends LabelProvider {

		private Image fElementImage;

		public ExclusionInclusionLabelProvider(ImageDescriptor descriptor) {
			ImageDescriptorRegistry registry = DLTKUIPlugin
					.getImageDescriptorRegistry();
			fElementImage = registry.get(descriptor);
		}

		@Override
		public Image getImage(Object element) {
			return fElementImage;
		}

		@Override
		public String getText(Object element) {
			return (String) element;
		}

	}

	private ListDialogField createListContents(BPListElement entryToEdit,
			String key, String label, ImageDescriptor descriptor,
			String[] buttonLabels) {
		ExclusionPatternAdapter adapter = new ExclusionPatternAdapter();

		ListDialogField patternList = new ListDialogField(adapter, buttonLabels,
				new ExclusionInclusionLabelProvider(descriptor));
		patternList.setDialogFieldListener(adapter);
		patternList.setLabelText(label);
		patternList.enableButton(IDX_EDIT, false);
		patternList.enableButton(IDX_REMOVE, false);

		IPath[] pattern = (IPath[]) entryToEdit.getAttribute(key);

		ArrayList elements = new ArrayList(pattern.length);
		for (int i = 0; i < pattern.length; i++) {
			String patternName = pattern[i].toString();
			if (patternName.length() > 0)
				elements.add(patternName);
		}
		patternList.setElements(elements);
		patternList.selectFirstElement();
		patternList.enableButton(IDX_ADD_MULTIPLE, fCurrSourceFolder != null);
		patternList.setViewerComparator(new ViewerComparator());
		return patternList;
	}

	protected void doCustomButtonPressed(ListDialogField field, int index) {
		if (index == IDX_ADD) {
			addEntry(field);
		} else if (index == IDX_EDIT) {
			editEntry(field);
		} else if (index == IDX_ADD_MULTIPLE) {
			addMultipleEntries(field);
		} else if (index == IDX_REMOVE) {
			field.removeElements(field.getSelectedElements());
		}
		updateStatus();
	}

	private void updateStatus() {
		fCurrElement.setAttribute(BPListElement.INCLUSION,
				getInclusionPattern());
		fCurrElement.setAttribute(BPListElement.EXCLUSION,
				getExclusionPattern());
		IModelStatus status = BuildpathEntry.validateBuildpath(
				fCurrElement.getScriptProject(),
				BPListElement.convertToBuildpathEntries(fExistingEntries));
		if (!status.isOK()) {
			StatusInfo statusInfo = new StatusInfo();
			statusInfo.setError(status.getMessage());
			updateStatus(statusInfo);
		} else {
			StatusInfo statusInfo = new StatusInfo();
			statusInfo.setOK();
			updateStatus(statusInfo);
		}
	}

	protected void doDoubleClicked(ListDialogField field) {
		editEntry(field);
		updateStatus();
	}

	protected void doSelectionChanged(ListDialogField field) {
		List selected = field.getSelectedElements();
		field.enableButton(IDX_EDIT, canEdit(selected));
		field.enableButton(IDX_REMOVE, canDelete(selected));
	}

	private boolean canEdit(List selected) {
		return selected.size() == 1;
	}

	private boolean canDelete(List selected) {
		return !selected.isEmpty();
	}

	private void editEntry(ListDialogField field) {
		List selElements = field.getSelectedElements();
		if (selElements.size() != 1) {
			return;
		}
		List existing = field.getElements();
		String entry = (String) selElements.get(0);
		ExclusionInclusionEntryDialog dialog = new ExclusionInclusionEntryDialog(
				getShell(), isExclusion(field), entry, existing, fCurrElement);
		if (dialog.open() == Window.OK) {
			field.replaceElement(entry, dialog.getExclusionPattern());
		}
	}

	private boolean isExclusion(ListDialogField field) {
		return field == fExclusionPatternList;
	}

	private void addEntry(ListDialogField field) {
		List existing = field.getElements();
		ExclusionInclusionEntryDialog dialog = new ExclusionInclusionEntryDialog(
				getShell(), isExclusion(field), null, existing, fCurrElement);
		if (dialog.open() == Window.OK) {
			field.addElement(dialog.getExclusionPattern());
		}
	}

	// -------- ExclusionPatternAdapter --------

	private class ExclusionPatternAdapter
			implements IListAdapter, IDialogFieldListener {

		@Override
		public void customButtonPressed(ListDialogField field, int index) {
			doCustomButtonPressed(field, index);
		}

		@Override
		public void selectionChanged(ListDialogField field) {
			doSelectionChanged(field);
		}

		@Override
		public void doubleClicked(ListDialogField field) {
			doDoubleClicked(field);
		}

		@Override
		public void dialogFieldChanged(DialogField field) {
		}

	}

	protected void doStatusLineUpdate() {
	}

	protected void checkIfPatternValid() {
	}

	private IPath[] getPattern(ListDialogField field) {
		Object[] arr = field.getElements().toArray();
		Arrays.sort(arr);
		IPath[] res = new IPath[arr.length];
		for (int i = 0; i < res.length; i++) {
			res[i] = new Path((String) arr[i]);
		}
		return res;
	}

	public IPath[] getExclusionPattern() {
		return getPattern(fExclusionPatternList);
	}

	public IPath[] getInclusionPattern() {
		return getPattern(fInclusionPatternList);
	}

	protected void configureShell(Shell newShell) {
		if (DLTKCore.DEBUG) {
			System.err.println("SetFilterWizardPage add help support here"); //$NON-NLS-1$
		}
		// PlatformUI.getWorkbench().getHelpSystem().setHelp(newShell,
		// IDLTKHelpContextIds.EXCLUSION_PATTERN_DIALOG);
	}

	private void addMultipleEntries(ListDialogField field) {
		String title, message;
		if (isExclusion(field)) {
			title = NewWizardMessages.ExclusionInclusionDialog_ChooseExclusionPattern_title;
			message = NewWizardMessages.ExclusionInclusionDialog_ChooseExclusionPattern_description;
		} else {
			title = NewWizardMessages.ExclusionInclusionDialog_ChooseInclusionPattern_title;
			message = NewWizardMessages.ExclusionInclusionDialog_ChooseInclusionPattern_description;
		}

		IPath[] res = ExclusionInclusionEntryDialog.chooseExclusionPattern(
				getShell(), fCurrSourceFolder, title, message, null, true);
		if (res != null) {
			for (int i = 0; i < res.length; i++) {
				field.addElement(res[i].toString());
			}
		}
	}

}