/*******************************************************************************
 * Copyright (c) 2008 Mateusz Matela 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:
 *     Mateusz Matela <mateusz.matela@gmail.com> -  Make StyledText work with ContentAssistCommandAdapter - https://bugs.eclipse.org/bugs/show_bug.cgi?id=246388
 *******************************************************************************/
package org.simantics.scl.ui.assist;

import org.eclipse.jface.fieldassist.IControlContentAdapter;
import org.eclipse.jface.fieldassist.IControlContentAdapter2;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Control;

/**
 * An {@link IControlContentAdapter} for {@link org.eclipse.swt.custom.StyledText}. This is
 * a convenience class for easily creating a {@link ContentProposalAdapter} for text fields.
 * 
 * @since 3.5
 */
public class StyledTextContentAdapter implements IControlContentAdapter, IControlContentAdapter2 {
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.fieldassist.IControlContentAdapter#getControlContents(org.eclipse
	 * .swt.widgets.Control)
	 */
	public String getControlContents(Control control) {
		return ((StyledText)control).getText();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.fieldassist.IControlContentAdapter#getCursorPosition(org.eclipse
	 * .swt.widgets.Control)
	 */
	public int getCursorPosition(Control control) {
		return ((StyledText)control).getCaretOffset();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.fieldassist.IControlContentAdapter#getInsertionBounds(org.eclipse
	 * .swt.widgets.Control)
	 */
	public Rectangle getInsertionBounds(Control control) {
		StyledText text= (StyledText)control;
		Point caretOrigin= text.getLocationAtOffset(text.getCaretOffset());
		return new Rectangle(caretOrigin.x + text.getClientArea().x, caretOrigin.y + text.getClientArea().y + 3, 1, text.getLineHeight());
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.fieldassist.IControlContentAdapter#insertControlContents(org.eclipse
	 * .swt.widgets.Control, java.lang.String, int)
	 */
	public void insertControlContents(Control control, String contents, int cursorPosition) {
		StyledText text = ((StyledText)control);
		cursorPosition = Math.min(cursorPosition, contents.length());
		int caretEndRange = text.getCaretOffset();
		String currentText = text.getText();
		
		int offset = caretEndRange;
        int length = currentText.length();
        while (--offset >= 0 && (Character.isJavaIdentifierPart(currentText.charAt(offset)) && !Character.isWhitespace(currentText.charAt(offset))))
            length--;
		
		int nameSpaceBeginRange = currentText.lastIndexOf(".", caretEndRange - 1); //$NON-NLS-1$
		if (nameSpaceBeginRange > length)
		    length = nameSpaceBeginRange;
		int endRange = currentText.length();
		if (caretEndRange < endRange)
		    endRange = caretEndRange;
		text.setSelection(length, endRange);
		text.insert(contents);
		// calculate the initial count of letters that was typed when the proposal was accepted to insert the caret
		// at the right position
		int proposalFirstLettersCount = endRange - (length);
		text.setCaretOffset(caretEndRange + cursorPosition - proposalFirstLettersCount);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.fieldassist.IControlContentAdapter#setControlContents(org.eclipse
	 * .swt.widgets.Control, java.lang.String, int)
	 */
	public void setControlContents(Control control, String contents, int cursorPosition) {
		((StyledText)control).setText(contents);
		((StyledText)control).setCaretOffset(cursorPosition);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.fieldassist.IControlContentAdapter#setCursorPosition(org.eclipse
	 * .swt.widgets.Control, int)
	 */
	public void setCursorPosition(Control control, int index) {
		((StyledText)control).setCaretOffset(index);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.fieldassist.IControlContentAdapter2#getSelection(org.eclipse.swt
	 * .widgets.Control)
	 */
	public Point getSelection(Control control) {
		return ((StyledText)control).getSelection();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.fieldassist.IControlContentAdapter2#setSelection(org.eclipse.swt
	 * .widgets.Control, org.eclipse.swt.graphics.Point)
	 */
	public void setSelection(Control control, Point range) {
		((StyledText)control).setSelection(range);
	}

}