/*******************************************************************************
 * Copyright (c) 2000, 2011 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.jdt.internal.ui.preferences;

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.DirectoryDialog;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;

import org.eclipse.core.resources.IContainer;
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.jface.layout.PixelConverter;
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.ui.dialogs.ElementTreeSelectionDialog;
import org.eclipse.ui.model.WorkbenchContentProvider;
import org.eclipse.ui.model.WorkbenchLabelProvider;
import org.eclipse.ui.views.navigator.ResourceComparator;

import org.eclipse.jdt.core.IClasspathEntry;

import org.eclipse.jdt.internal.corext.util.Messages;

import org.eclipse.jdt.internal.ui.dialogs.StatusInfo;
import org.eclipse.jdt.internal.ui.viewsupport.BasicElementLabels;
import org.eclipse.jdt.internal.ui.wizards.IStatusChangeListener;
import org.eclipse.jdt.internal.ui.wizards.NewWizardMessages;
import org.eclipse.jdt.internal.ui.wizards.TypedElementSelectionValidator;
import org.eclipse.jdt.internal.ui.wizards.TypedViewerFilter;
import org.eclipse.jdt.internal.ui.wizards.dialogfields.DialogField;
import org.eclipse.jdt.internal.ui.wizards.dialogfields.IDialogFieldListener;
import org.eclipse.jdt.internal.ui.wizards.dialogfields.LayoutUtil;
import org.eclipse.jdt.internal.ui.wizards.dialogfields.SelectionButtonDialogField;
import org.eclipse.jdt.internal.ui.wizards.dialogfields.StringDialogField;


public class NativeLibrariesConfigurationBlock {

	private class NativeLibrariesAdapter implements IDialogFieldListener {
		public void dialogFieldChanged(DialogField field) {
			doFieldChanged(field);
		}
	}

	private StringDialogField fPathField;
	private SelectionButtonDialogField fBrowseWorkspace;
	private SelectionButtonDialogField fBrowseExternal;
	private final IClasspathEntry fEntry;
	private Shell fShell;
	private final IStatusChangeListener fListener;
	private final String fOrginalValue;

	public NativeLibrariesConfigurationBlock(IStatusChangeListener listener, Shell parent, String nativeLibPath, IClasspathEntry parentEntry) {
		fListener= listener;
		fEntry= parentEntry;

		NativeLibrariesAdapter adapter= new NativeLibrariesAdapter();

		fPathField= new StringDialogField();
		fPathField.setLabelText(NewWizardMessages.NativeLibrariesDialog_location_label);
		fPathField.setDialogFieldListener(adapter);

		fBrowseWorkspace= new SelectionButtonDialogField(SWT.PUSH);
		fBrowseWorkspace.setLabelText(NewWizardMessages.NativeLibrariesDialog_workspace_browse);
		fBrowseWorkspace.setDialogFieldListener(adapter);

		fBrowseExternal= new SelectionButtonDialogField(SWT.PUSH);
		fBrowseExternal.setLabelText(NewWizardMessages.NativeLibrariesDialog_external_browse);
		fBrowseExternal.setDialogFieldListener(adapter);

		if (nativeLibPath != null) {
			fPathField.setText(Path.fromPortableString(nativeLibPath).toString());
			fOrginalValue= nativeLibPath;
		} else {
			fOrginalValue= ""; //$NON-NLS-1$
		}
	}

	public Control createContents(Composite parent) {
		fShell= parent.getShell();

		Composite inner= new Composite(parent, SWT.NONE);
		inner.setFont(parent.getFont());
		inner.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

		int nColumns= 3;

		GridLayout layout= new GridLayout(nColumns, false);
		layout.marginWidth= 0;
		layout.marginWidth= 0;
		inner.setLayout(layout);

		PixelConverter converter= new PixelConverter(parent);

		Label desc= new Label(inner, SWT.WRAP);
		desc.setFont(inner.getFont());
		desc.setText(Messages.format(NewWizardMessages.NativeLibrariesDialog_description, new String[] { BasicElementLabels.getResourceName(fEntry.getPath().lastSegment()) }));
		GridData gridData= new GridData(GridData.FILL, GridData.CENTER, false, false, 3, 1);
		gridData.widthHint= converter.convertWidthInCharsToPixels(80);
		desc.setLayoutData(gridData);

		fPathField.doFillIntoGrid(inner, 2);
		LayoutUtil.setHorizontalGrabbing(fPathField.getTextControl(null));
		LayoutUtil.setWidthHint(fPathField.getTextControl(null), converter.convertWidthInCharsToPixels(50));

		fBrowseExternal.doFillIntoGrid(inner, 1);

		DialogField.createEmptySpace(inner, 2);
		fBrowseWorkspace.doFillIntoGrid(inner, 1);

		fPathField.setFocus();

		return parent;
	}

	public String getNativeLibraryPath() {
		String val= fPathField.getText();
		if (val.length() == 0) {
			return null;
		}
		return new Path(val).toPortableString();
	}

	final void doFieldChanged(DialogField field) {
		if (field == fBrowseExternal) {
			String res= chooseExternal();
			if (res != null) {
				fPathField.setText(res);
			}
		} else if (field == fBrowseWorkspace) {
			String res= chooseInternal();
			if (res != null) {
				fPathField.setText(res);
			}
		} else if (field == fPathField) {
			fListener.statusChanged(validatePath());
		}
	}

	private IStatus validatePath() {
		StatusInfo status= new StatusInfo();
		String val= fPathField.getText();
		if (val.length() == 0) {
			return status;
		}
		Path path= new Path(val);
		if (path.isAbsolute()) {
			if (!path.toFile().isDirectory()) {
				status.setWarning(NewWizardMessages.NativeLibrariesDialog_error_external_not_existing);
				return status;
			}
		} else {
			if (!(ResourcesPlugin.getWorkspace().getRoot().findMember(path) instanceof IContainer)) {
				status.setWarning(NewWizardMessages.NativeLibrariesDialog_error_internal_not_existing);
				return status;
			}
		}
		return status;
	}

	private String chooseExternal() {
		IPath currPath= new Path(fPathField.getText());
		if (currPath.isEmpty()) {
			currPath= fEntry.getPath();
		} else {
			currPath= currPath.removeLastSegments(1);
		}

		DirectoryDialog dialog= new DirectoryDialog(fShell);
		dialog.setMessage(NewWizardMessages.NativeLibrariesDialog_external_message);
		dialog.setText(NewWizardMessages.NativeLibrariesDialog_extfiledialog_text);
		dialog.setFilterPath(currPath.toOSString());
		String res= dialog.open();
		if (res != null) {
			return res;
		}
		return null;
	}

	/*
	 * Opens a dialog to choose an internal file.
	 */
	private String chooseInternal() {
		String initSelection= fPathField.getText();

		ILabelProvider lp= new WorkbenchLabelProvider();
		ITreeContentProvider cp= new WorkbenchContentProvider();
		Class<?>[] acceptedClasses= new Class[] { IProject.class, IFolder.class };
		TypedElementSelectionValidator validator= new TypedElementSelectionValidator(acceptedClasses, true);
		ViewerFilter filter= new TypedViewerFilter(acceptedClasses);

		IResource initSel= null;
		IWorkspaceRoot root= ResourcesPlugin.getWorkspace().getRoot();
		if (initSelection.length() > 0) {
			initSel= root.findMember(new Path(initSelection));
		}
		if (initSel == null) {
			initSel= root.findMember(fEntry.getPath());
		}

		ElementTreeSelectionDialog dialog= new ElementTreeSelectionDialog(fShell, lp, cp);
		dialog.setAllowMultiple(false);
		dialog.setValidator(validator);
		dialog.addFilter(filter);
		dialog.setComparator(new ResourceComparator(ResourceComparator.NAME));
		dialog.setTitle(NewWizardMessages.NativeLibrariesDialog_intfiledialog_title);
		dialog.setMessage(NewWizardMessages.NativeLibrariesDialog_intfiledialog_message);
		dialog.setInput(root);
		dialog.setInitialSelection(initSel);
		dialog.setHelpAvailable(false);
		if (dialog.open() == Window.OK) {
			IResource res= (IResource) dialog.getFirstResult();
			return res.getFullPath().makeRelative().toString();
		}
		return null;
	}

	public void performDefaults() {
		fPathField.setText(fOrginalValue);
	}

}