/*******************************************************************************
 * Copyright (c) 2010 Alena Laskavaia 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:
 *     Alena Laskavaia - initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.codan.internal.ui.dialogs;

import java.text.MessageFormat;
import java.util.List;

import org.eclipse.cdt.codan.core.param.FileScopeProblemPreference;
import org.eclipse.cdt.codan.internal.ui.CodanUIMessages;
import org.eclipse.cdt.codan.internal.ui.widgets.BasicElementLabels;
import org.eclipse.cdt.internal.ui.dialogs.StatusInfo;
import org.eclipse.cdt.internal.ui.dialogs.TypedElementSelectionValidator;
import org.eclipse.cdt.internal.ui.dialogs.TypedViewerFilter;
import org.eclipse.cdt.internal.ui.wizards.dialogfields.DialogField;
import org.eclipse.cdt.internal.ui.wizards.dialogfields.IDialogFieldListener;
import org.eclipse.cdt.internal.ui.wizards.dialogfields.IStringButtonAdapter;
import org.eclipse.cdt.internal.ui.wizards.dialogfields.LayoutUtil;
import org.eclipse.cdt.internal.ui.wizards.dialogfields.StringButtonDialogField;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.dialogs.StatusDialog;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
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.ui.dialogs.ElementTreeSelectionDialog;
import org.eclipse.ui.dialogs.ISelectionStatusValidator;
import org.eclipse.ui.model.WorkbenchContentProvider;
import org.eclipse.ui.model.WorkbenchLabelProvider;
import org.eclipse.ui.views.navigator.ResourceComparator;

public class ExclusionInclusionEntryDialog extends StatusDialog {
	private StringButtonDialogField fExclusionPatternDialog;
	private StatusInfo fExclusionPatternStatus;
	private IContainer fCurrSourceFolder;
	private String fExclusionPattern;
	private List fExistingPatterns;
	private boolean fIsExclusion;

	public ExclusionInclusionEntryDialog(Shell parent, boolean isExclusion, String patternToEdit, List existingPatterns,
			FileScopeProblemPreference entryToEdit) {
		super(parent);
		fIsExclusion = isExclusion;
		fExistingPatterns = existingPatterns;
		String title, message;
		if (isExclusion) {
			if (patternToEdit == null) {
				title = CodanUIMessages.ExclusionInclusionEntryDialog_exclude_add_title;
			} else {
				title = CodanUIMessages.ExclusionInclusionEntryDialog_exclude_edit_title;
			}
			message = MessageFormat.format(CodanUIMessages.ExclusionInclusionEntryDialog_exclude_pattern_label,
					BasicElementLabels.getPathLabel(entryToEdit.getPath(), false));
		} else {
			if (patternToEdit == null) {
				title = CodanUIMessages.ExclusionInclusionEntryDialog_include_add_title;
			} else {
				title = CodanUIMessages.ExclusionInclusionEntryDialog_include_edit_title;
			}
			message = MessageFormat.format(CodanUIMessages.ExclusionInclusionEntryDialog_include_pattern_label,
					BasicElementLabels.getPathLabel(entryToEdit.getPath(), false));
		}
		setTitle(title);
		if (patternToEdit != null) {
			fExistingPatterns.remove(patternToEdit);
		}
		IProject currProject = entryToEdit.getProject();
		IWorkspaceRoot root = currProject != null ? currProject.getWorkspace().getRoot() : ResourcesPlugin.getWorkspace().getRoot();
		IResource res = root.findMember(entryToEdit.getPath());
		if (res instanceof IContainer) {
			fCurrSourceFolder = (IContainer) res;
		}
		fExclusionPatternStatus = new StatusInfo();
		ExclusionPatternAdapter adapter = new ExclusionPatternAdapter();
		fExclusionPatternDialog = new StringButtonDialogField(adapter);
		fExclusionPatternDialog.setLabelText(message);
		fExclusionPatternDialog.setButtonLabel(CodanUIMessages.ExclusionInclusionEntryDialog_pattern_button);
		fExclusionPatternDialog.setDialogFieldListener(adapter);
		fExclusionPatternDialog.enableButton(fCurrSourceFolder != null);
		if (patternToEdit == null) {
			fExclusionPatternDialog.setText(""); //$NON-NLS-1$
		} else {
			fExclusionPatternDialog.setText(patternToEdit.toString());
		}
	}

	@Override
	protected Control createDialogArea(Composite parent) {
		Composite composite = (Composite) super.createDialogArea(parent);
		int widthHint = convertWidthInCharsToPixels(60);
		Composite inner = new Composite(composite, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginHeight = 0;
		layout.marginWidth = 0;
		layout.numColumns = 2;
		inner.setLayout(layout);
		Label description = new Label(inner, SWT.WRAP);
		if (fIsExclusion) {
			description.setText(CodanUIMessages.ExclusionInclusionEntryDialog_exclude_description);
		} else {
			description.setText(CodanUIMessages.ExclusionInclusionEntryDialog_include_description);
		}
		GridData gd = new GridData();
		gd.horizontalSpan = 2;
		gd.widthHint = convertWidthInCharsToPixels(80);
		description.setLayoutData(gd);
		fExclusionPatternDialog.doFillIntoGrid(inner, 3);
		LayoutUtil.setWidthHint(fExclusionPatternDialog.getLabelControl(null), widthHint);
		LayoutUtil.setHorizontalSpan(fExclusionPatternDialog.getLabelControl(null), 2);
		LayoutUtil.setWidthHint(fExclusionPatternDialog.getTextControl(null), widthHint);
		LayoutUtil.setHorizontalGrabbing(fExclusionPatternDialog.getTextControl(null), true);
		fExclusionPatternDialog.postSetFocusOnDialogField(parent.getDisplay());
		applyDialogFont(composite);
		return composite;
	}

	// -------- ExclusionPatternAdapter --------
	private class ExclusionPatternAdapter implements IDialogFieldListener, IStringButtonAdapter {
		// -------- IDialogFieldListener
		@Override
		public void dialogFieldChanged(DialogField field) {
			doStatusLineUpdate();
		}

		@Override
		public void changeControlPressed(DialogField field) {
			doChangeControlPressed();
		}
	}

	protected void doChangeControlPressed() {
		IPath pattern = chooseExclusionPattern();
		if (pattern != null) {
			fExclusionPatternDialog.setText(pattern.toString());
		}
	}

	protected void doStatusLineUpdate() {
		checkIfPatternValid();
		updateStatus(fExclusionPatternStatus);
	}

	protected void checkIfPatternValid() {
		String pattern = fExclusionPatternDialog.getText().trim();
		if (pattern.length() == 0) {
			fExclusionPatternStatus.setError(CodanUIMessages.ExclusionInclusionEntryDialog_error_empty);
			return;
		}
		IPath path = new Path(pattern);
		if (path.isAbsolute() || path.getDevice() != null) {
			fExclusionPatternStatus.setError(CodanUIMessages.ExclusionInclusionEntryDialog_error_notrelative);
			return;
		}
		if (fExistingPatterns.contains(pattern)) {
			fExclusionPatternStatus.setError(CodanUIMessages.ExclusionInclusionEntryDialog_error_exists);
			return;
		}
		fExclusionPattern = pattern;
		fExclusionPatternStatus.setOK();
	}

	public String getExclusionPattern() {
		return fExclusionPattern;
	}

	/*
	 * @see org.eclipse.jface.window.Window#configureShell(Shell)
	 */
	@Override
	protected void configureShell(Shell newShell) {
		super.configureShell(newShell);
	}

	// ---------- util method ------------
	private IPath chooseExclusionPattern() {
		String title, message;
		if (fIsExclusion) {
			title = CodanUIMessages.ExclusionInclusionEntryDialog_ChooseExclusionPattern_title;
			message = CodanUIMessages.ExclusionInclusionEntryDialog_ChooseExclusionPattern_description;
		} else {
			title = CodanUIMessages.ExclusionInclusionEntryDialog_ChooseInclusionPattern_title;
			message = CodanUIMessages.ExclusionInclusionEntryDialog_ChooseInclusionPattern_description;
		}
		IPath initialPath = new Path(fExclusionPatternDialog.getText());
		IPath[] res = chooseExclusionPattern(getShell(), fCurrSourceFolder, title, message, initialPath, false);
		if (res == null) {
			return null;
		}
		return res[0];
	}

	public static IPath[] chooseExclusionPattern(Shell shell, IContainer currentSourceFolder, String title, String message,
			IPath initialPath, boolean multiSelection) {
		Class[] acceptedClasses = new Class[] { IFolder.class, IFile.class, IProject.class };
		ISelectionStatusValidator validator = new TypedElementSelectionValidator(acceptedClasses, multiSelection);
		ViewerFilter filter = new TypedViewerFilter(acceptedClasses);
		ILabelProvider lp = new WorkbenchLabelProvider();
		ITreeContentProvider cp = new WorkbenchContentProvider();
		IResource initialElement = null;
		if (initialPath != null) {
			IContainer curr = currentSourceFolder;
			int nSegments = initialPath.segmentCount();
			for (int i = 0; i < nSegments; i++) {
				IResource elem = curr.findMember(initialPath.segment(i));
				if (elem != null) {
					initialElement = elem;
				}
				if (elem instanceof IContainer) {
					curr = (IContainer) elem;
				} else {
					break;
				}
			}
		}
		ElementTreeSelectionDialog dialog = new ElementTreeSelectionDialog(shell, lp, cp);
		dialog.setTitle(title);
		dialog.setValidator(validator);
		dialog.setMessage(message);
		dialog.addFilter(filter);
		dialog.setInput(currentSourceFolder);
		dialog.setInitialSelection(initialElement);
		dialog.setComparator(new ResourceComparator(ResourceComparator.NAME));
		dialog.setHelpAvailable(false);
		if (dialog.open() == Window.OK) {
			Object[] objects = dialog.getResult();
			int existingSegments = currentSourceFolder.getFullPath().segmentCount();
			IPath[] resArr = new IPath[objects.length];
			for (int i = 0; i < objects.length; i++) {
				IResource currRes = (IResource) objects[i];
				IPath path = currRes.getFullPath().removeFirstSegments(existingSegments).makeRelative();
				if (currRes instanceof IContainer) {
					path = path.addTrailingSeparator();
				}
				resArr[i] = path;
			}
			return resArr;
		}
		return null;
	}
}
