/*

 * Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies). 

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description:

 *

 * Viewer Mouse Click Listener class

 *

 */

package com.nokia.traceviewer.view.listener;

import java.util.List;

import org.eclipse.jface.text.TextViewer;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.MouseEvent;

import org.eclipse.swt.events.MouseListener;

import org.eclipse.swt.graphics.Point;

import com.nokia.traceviewer.action.OpenTraceLocationAction;

import com.nokia.traceviewer.engine.TraceMetaData;

import com.nokia.traceviewer.engine.TraceProperties;

import com.nokia.traceviewer.engine.TraceViewerGlobals;

import com.nokia.traceviewer.engine.TraceViewerUtils;

/**

 * Viewer Mouse Click listener

 * 

 */

public class ViewerClickListener implements MouseListener {

	/**

	 * Left mouse button

	 */

	private static final int BUTTON_1 = 1;

	/**

	 * Right mouse button

	 */

	private static final int BUTTON_3 = 3;

	/**

	 * Double click count

	 */

	private static final int DOUBLE_CLICK_COUNT = 2;

	/**

	 * Triple click count

	 */

	private static final int TRIPLE_CLICK_COUNT = 3;

	/**

	 * Text viewer

	 */

	private final TextViewer viewer;

	/**

	 * Constructor

	 * 

	 * @param viewer

	 */

	public ViewerClickListener(TextViewer viewer) {

		this.viewer = viewer;

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see

	 * org.eclipse.swt.events.MouseListener#mouseDoubleClick(org.eclipse.swt

	 * .events.MouseEvent)

	 */

	public void mouseDoubleClick(MouseEvent event) {

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see

	 * org.eclipse.swt.events.MouseListener#mouseDown(org.eclipse.swt.events

	 * .MouseEvent)

	 */

	public void mouseDown(MouseEvent event) {

		if (event.button == BUTTON_1) {

			// If shift was not pressed, save the line where click happened

			if ((event.stateMask & SWT.SHIFT) == 0) {

				// Single click

				if (event.count == 1) {

					saveClickedLineProperties(event, true);

					// Double click, jump to source code

				} else if (event.count == DOUBLE_CLICK_COUNT) {

					jumpToSource(event);

					// Triple click, remove one character from the selection

				} else if (event.count == TRIPLE_CLICK_COUNT) {

					Point point = viewer.getSelectedRange();

					viewer.setSelectedRange(point.x, point.y - 1);

				}

			} else {

				// Shift was pressed, select lines from viewer if necessary

				saveClickedLineProperties(event, false);

				selectLinesFromViewer(event);

			}

			// Select the line with right mouse button

		} else if (event.button == BUTTON_3) {

			String text = viewer.getTextWidget().getText();

			if (text.length() > 0) {

				int startOffset = viewer.getTextWidget().getSelectionRange().x - 1;

				int endOffset = startOffset

						+ viewer.getTextWidget().getSelectionRange().y + 1;

				if (startOffset < 0) {

					startOffset = 0;

				}

				if (endOffset >= text.length()) {

					endOffset = text.length() - 1;

				}

				char c1 = text.charAt(startOffset);

				char c2 = text.charAt(endOffset);

				if (!viewer.getTextWidget().getSelectionText().contains("\n") //$NON-NLS-1$

						&& (viewer.getTextWidget().getSelectionCount() == 0

								|| (c1 == '\n' && c2 == '\n') || startOffset == 0)) {

					// Save the line number

					int clickedLine = getClickedLine(event)

							+ TraceViewerGlobals.getTraceViewer().getView()

									.getShowingTracesFrom();

					SelectionProperties.firstClickedLine = clickedLine;

					SelectionProperties.lastClickedLine = clickedLine;

					selectClickedLine(event);

				}

			}

		}

	}

	/**

	 * Saves clicked lines properties

	 * 

	 * @param event

	 *            mouse event

	 * @param firstClick

	 *            if true, save line properties to first click, otherwise to

	 *            last click

	 */

	private void saveClickedLineProperties(MouseEvent event, boolean firstClick) {

		// Get timestamp length

		int timestampLength = TraceViewerGlobals.getTraceViewer()

				.getDataProcessorAccess().getTimestampParser()

				.getTimestampStringLength();

		// Save the line number

		int clickedLine = getClickedLine(event)

				+ TraceViewerGlobals.getTraceViewer().getView()

						.getShowingTracesFrom();

		int offsetAtLine = viewer.getTextWidget().getOffsetAtLine(

				getClickedLine(event));

		if (offsetAtLine + timestampLength > viewer.getTextWidget()

				.getCharCount()

				&& getClickedLine(event) > 0) {

			int line = getClickedLine(event) - 1;

			if (line > 0 && line < viewer.getTextWidget().getLineCount()) {

				offsetAtLine = viewer.getTextWidget().getOffsetAtLine(line);

			} else {

				// Offset is wrong, make sure we won't save it. Minus some value

				// so the value doesn't go around when something is added to it

				offsetAtLine = Integer.MAX_VALUE - timestampLength - 1;

			}

		}

		int clickedLineCaretOffset = 0;

		String clickedTimestamp = ""; //$NON-NLS-1$

		if (offsetAtLine + timestampLength < viewer.getTextWidget()

				.getCharCount()) {

			// Save the caret offset

			clickedLineCaretOffset = viewer.getTextWidget().getCaretOffset()

					- offsetAtLine;

			// Save the timestamp String

			clickedTimestamp = TraceViewerUtils

					.getTimestampStringForTrace(clickedLine);

		}

		// Save variables to the first click

		if (firstClick) {

			SelectionProperties.firstClickedLine = clickedLine;

			SelectionProperties.firstClickedLineCaretOffset = clickedLineCaretOffset;

			SelectionProperties.firstClickedTimestamp = clickedTimestamp;

			// Null last click values

			SelectionProperties.lastClickedLine = -1;

			SelectionProperties.lastClickedLineCaretOffset = 0;

			SelectionProperties.lastClickedTimestamp = ""; //$NON-NLS-1$

			ViewerSelectionChangedListener.handleTrimInformationUpdate();

		} else {

			// Save variables to the last click

			SelectionProperties.lastClickedLine = clickedLine;

			SelectionProperties.lastClickedLineCaretOffset = clickedLineCaretOffset;

			SelectionProperties.lastClickedTimestamp = clickedTimestamp;

		}

	}

	/**

	 * Selects lines from viewer when clicked with shift down

	 * 

	 * @param event

	 *            mouse click event

	 */

	private void selectLinesFromViewer(MouseEvent event) {

		int showingFrom = TraceViewerGlobals.getTraceViewer().getView()

				.getShowingTracesFrom();

		int currentLine = getClickedLine(event) + showingFrom;

		int caretOffset = viewer.getTextWidget().getCaretOffset();

		// Current line is smaller than the one clicked first

		// Select everything from current line to the first clicked

		// or to the end of the block

		if (currentLine < SelectionProperties.firstClickedLine) {

			// Selection goes out of the block

			if (SelectionProperties.firstClickedLine > showingFrom

					+ viewer.getTextWidget().getLineCount()) {

				int topIndex = viewer.getTopIndex();

				viewer.getTextWidget().setRedraw(false);

				viewer.getTextWidget().setSelection(

						viewer.getTextWidget().getCharCount() - 1, caretOffset);

				viewer.setTopIndex(topIndex);

				viewer.getTextWidget().setRedraw(true);

			}

		} else {

			// Current line is bigger than the one clicked first

			// Select everything upwards from the current line to the first

			// clicked or to the top of the block

			// Selection start goes up from this block

			if (SelectionProperties.firstClickedLine < showingFrom) {

				// Select from start of this block to current pos

				viewer.setSelectedRange(0, caretOffset);

			}

		}

		// Update Trim widget

		ViewerSelectionChangedListener.handleTrimInformationUpdate();

	}

	/**

	 * Selects clicked line

	 * 

	 * @param event

	 *            clicking event

	 */

	private void selectClickedLine(MouseEvent event) {

		int clickedInLine = getClickedLine(event);

		if (clickedInLine < viewer.getTextWidget().getLineCount() - 1) {

			int beginIdx = viewer.getTextWidget()

					.getOffsetAtLine(clickedInLine);

			int endIdx = viewer.getTextWidget().getOffsetAtLine(

					clickedInLine + 1) - 1;

			// Select backwards to keep Viewer in the beginning of the trace

			viewer.getTextWidget().setSelection(endIdx, beginIdx);

			String clickedTimestamp = TraceViewerUtils

					.getTimestampStringForTrace(clickedInLine);

			// Set properties

			SelectionProperties.firstClickedLineCaretOffset = 0;

			SelectionProperties.firstClickedTimestamp = clickedTimestamp;

			SelectionProperties.lastClickedLineCaretOffset = endIdx - beginIdx;

			SelectionProperties.lastClickedTimestamp = clickedTimestamp;

			// Update Trim widget

			ViewerSelectionChangedListener.handleTrimInformationUpdate();

		}

	}

	/**

	 * Gets linenumber where clicking happened

	 * 

	 * @param event

	 *            clicking event

	 * @return line number where clicking happened

	 */

	private int getClickedLine(MouseEvent event) {

		int clickedInLine = viewer.getTextWidget().getLineIndex(event.y);

		return clickedInLine;

	}

	/**

	 * Jumps to source code

	 * 

	 * @param event

	 *            click event

	 */

	private void jumpToSource(MouseEvent event) {

		// Get the line number

		int clickedLine = getClickedLine(event)

				+ TraceViewerGlobals.getTraceViewer().getView()

						.getShowingTracesFrom();

		// Get the trace from the file

		List<TraceProperties> traceList = TraceViewerGlobals.getTraceViewer()

				.getTraces(clickedLine, clickedLine);

		TraceProperties trace = null;

		if (traceList != null && !traceList.isEmpty()) {

			trace = traceList.get(0);

		}

		// If traceInformation is found, jump to source code line

		if (trace != null && trace.information != null) {

			TraceMetaData metaData = TraceViewerGlobals.getDecodeProvider()

					.getTraceMetaData(trace.information);

			if (metaData != null && metaData.getPath() != null) {

				OpenTraceLocationAction openLocationAction = (OpenTraceLocationAction) TraceViewerGlobals

						.getTraceViewer().getView().getActionFactory()

						.getOpenTraceLocationAction();

				openLocationAction.setMetaData(metaData, false);

				openLocationAction.run();

			}

		}

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @seeorg.eclipse.swt.events.MouseListener#mouseUp(org.eclipse.swt.events.

	 * MouseEvent)

	 */

	public void mouseUp(MouseEvent event) {

	}

}