/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation.
 *     Atsuhiko Yamanaka, JCraft,Inc. - Bug 170883
 *******************************************************************************/
package org.eclipse.jsch.internal.ui.preference;

import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;
import org.eclipse.ui.dialogs.PreferenceLinkArea;
import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer;

public class SWTUtils {

	public static final int MARGINS_DEFAULT= -1;
	public static final int MARGINS_NONE= 0;
	public static final int MARGINS_DIALOG= 1;

	public static PreferenceLinkArea createPreferenceLink(IWorkbenchPreferenceContainer container, Composite parent, String pageId, String text) {
		final PreferenceLinkArea area = new PreferenceLinkArea(parent, SWT.NONE, pageId, text, container, null);
		return area;
	}

	public static GridData createGridData(int width, int height, boolean hFill, boolean vFill) {
		return createGridData(width, height, hFill ? SWT.FILL : SWT.BEGINNING, vFill ? SWT.FILL : SWT.CENTER, hFill, vFill);
	}

	public static GridData createGridData(int width, int height, int hAlign, int vAlign, boolean hGrab, boolean vGrab) {
		final GridData gd= new GridData(hAlign, vAlign, hGrab, vGrab);
		gd.widthHint= width;
		gd.heightHint= height;
		return gd;
	}

	public static GridData createHFillGridData() {
		return createHFillGridData(1);
	}

	public static GridData createHFillGridData(int span) {
		final GridData gd= createGridData(0, SWT.DEFAULT, SWT.FILL, SWT.CENTER, true, false);
		gd.horizontalSpan= span;
		return gd;
	}

	public static Composite createHFillComposite(Composite parent, int margins) {
		return createHFillComposite(parent, margins, 1);
	}

	public static Composite createHFillComposite(Composite parent, int margins, int columns) {
		final Composite composite= new Composite(parent, SWT.NONE);
		composite.setFont(parent.getFont());
		composite.setLayoutData(createHFillGridData());
		composite.setLayout(createGridLayout(columns, new PixelConverter(parent), margins));
		return composite;
	}

	public static Composite createHVFillComposite(Composite parent, int margins) {
		return createHVFillComposite(parent, margins, 1);
	}

	public static Composite createHVFillComposite(Composite parent, int margins, int columns) {
		final Composite composite= new Composite(parent, SWT.NONE);
		composite.setFont(parent.getFont());
		composite.setLayoutData(createHVFillGridData());
		composite.setLayout(createGridLayout(columns, new PixelConverter(parent), margins));
		return composite;
	}


	public static Group createHFillGroup(Composite parent, String text, int margins) {
		return createHFillGroup(parent, text, margins, 1);
	}

	public static Group createHFillGroup(Composite parent, String text, int margins, int rows) {
		final Group group= new Group(parent, SWT.NONE);
		group.setFont(parent.getFont());
		group.setLayoutData(createHFillGridData());
		if (text != null)
			group.setText(text);
		group.setLayout(createGridLayout(rows, new PixelConverter(parent), margins));
		return group;
	}

	public static Group createHVFillGroup(Composite parent, String text, int margins) {
		return createHVFillGroup(parent, text, margins, 1);
	}

	public static Group createHVFillGroup(Composite parent, String text, int margins, int rows) {
		final Group group= new Group(parent, SWT.NONE);
		group.setFont(parent.getFont());
		group.setLayoutData(createHVFillGridData());
		if (text != null)
			group.setText(text);
		group.setLayout(createGridLayout(rows, new PixelConverter(parent), margins));
		return group;
	}

	public static GridData createHVFillGridData() {
		return createHVFillGridData(1);
	}

	public static GridData createHVFillGridData(int span) {
		final GridData gd= createGridData(0, 0, true, true);
		gd.horizontalSpan= span;
		return gd;
	}


	/**
	 * Create a grid layout with the specified number of columns and the
	 * standard spacings.
	 *
	 * @param numColumns
	 *                the number of columns
	 * @param converter
	 *                the pixel converter
	 * @param margins
	 *                One of <code>MARGINS_DEFAULT</code>,
	 *                <code>MARGINS_NONE</code> or <code>MARGINS_DIALOG</code>.
	 * @return the grid layout
	 */
	public static GridLayout createGridLayout(int numColumns, PixelConverter converter, int margins) {
		Assert.isTrue(margins == MARGINS_DEFAULT || margins == MARGINS_NONE || margins == MARGINS_DIALOG);

		final GridLayout layout= new GridLayout(numColumns, false);
		layout.horizontalSpacing= converter.convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);
		layout.verticalSpacing= converter.convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING);

		switch (margins) {
		case MARGINS_NONE:
			layout.marginLeft= layout.marginRight= 0;
			layout.marginTop= layout.marginBottom= 0;
			break;
		case MARGINS_DIALOG:
			layout.marginLeft= layout.marginRight= converter.convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN);
			layout.marginTop= layout.marginBottom= converter.convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN);
			break;
		case MARGINS_DEFAULT:
			layout.marginLeft= layout.marginRight= layout.marginWidth;
			layout.marginTop= layout.marginBottom= layout.marginHeight;
		}
		layout.marginWidth= layout.marginHeight= 0;
		return layout;
	}


	public static Label createLabel(Composite parent, String message) {
		return createLabel(parent, message, 1);
	}

	public static Label createLabel(Composite parent, String message, int span) {
		final Label label= new Label(parent, SWT.WRAP);
		if (message != null)
			label.setText(message);
		label.setLayoutData(createHFillGridData(span));
		return label;
	}

	public static Button createCheckBox(Composite parent, String message) {
		return createCheckBox(parent, message, 1);
	}

	public static Button createCheckBox(Composite parent, String message, int span) {
		final Button button= new Button(parent, SWT.CHECK);
		button.setText(message);
		button.setLayoutData(createHFillGridData(span));
		return button;
	}

	public static Button createRadioButton(Composite parent, String message) {
		return createRadioButton(parent, message, 1);
	}

	public static Button createRadioButton(Composite parent, String message, int span) {
		final Button button= new Button(parent, SWT.RADIO);
		button.setText(message);
		button.setLayoutData(createHFillGridData(span));
		return button;
	}


	public static Text createText(Composite parent) {
		return createText(parent, 1);
	}

	public static Text createText(Composite parent, int span) {
		final Text text= new Text(parent, SWT.SINGLE | SWT.BORDER);
		text.setLayoutData(createHFillGridData(span));
		return text;
	}


	public static Control createPlaceholder(Composite parent, int heightInChars, int span) {
		Assert.isTrue(heightInChars > 0);
		final Control placeHolder= new Composite(parent, SWT.NONE);
		final GridData gd= new GridData(SWT.BEGINNING, SWT.TOP, false, false);
		gd.heightHint= new PixelConverter(parent).convertHeightInCharsToPixels(heightInChars);
		gd.horizontalSpan= span;
		placeHolder.setLayoutData(gd);
		return placeHolder;
	}


	public static Control createPlaceholder(Composite parent, int heightInChars) {
		return createPlaceholder(parent, heightInChars, 1);
	}

	public static PixelConverter createDialogPixelConverter(Control control) {
		Dialog.applyDialogFont(control);
		return new PixelConverter(control);
	}

	public static int calculateControlSize(PixelConverter converter, Control [] controls) {
		return calculateControlSize(converter, controls, 0, controls.length - 1);
	}

	public static int calculateControlSize(PixelConverter converter, Control [] controls, int start, int end) {
		int minimum= converter.convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
		for (int i = start; i <= end; i++) {
			final int length= controls[i].computeSize(SWT.DEFAULT, SWT.DEFAULT).x;
			if (minimum < length)
				minimum= length;
		}
		return minimum;
	}

	public static void equalizeControls(PixelConverter converter, Control [] controls) {
		equalizeControls(converter, controls, 0, controls.length - 1);
	}

	public static void equalizeControls(PixelConverter converter, Control [] controls, int start, int end) {
		final int size= calculateControlSize(converter, controls, start, end);
		for (int i = start; i <= end; i++) {
			final Control button= controls[i];
			if (button.getLayoutData() instanceof GridData) {
				((GridData)button.getLayoutData()).widthHint= size;
			}
		}
	}

	public static int getWidthInCharsForLongest(PixelConverter converter, String [] strings) {
		int minimum= 0;
		for (String string : strings) {
			final int length = converter.convertWidthInCharsToPixels(string.length());
			if (minimum < length)
				minimum= length;
		}
		return minimum;
	}
}
