/*

 * Copyright (c) 2008-2010 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:  Definitions for the class AnalyzeToolGraph

 *

 */

package com.nokia.s60tools.analyzetool.internal.ui.graph;

import org.eclipse.jface.dialogs.IDialogConstants;

import org.eclipse.jface.dialogs.IInputValidator;

import org.eclipse.jface.layout.GridDataFactory;

import org.eclipse.jface.layout.GridLayoutFactory;

import org.eclipse.jface.resource.StringConverter;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.ModifyEvent;

import org.eclipse.swt.events.ModifyListener;

import org.eclipse.swt.widgets.Button;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Group;

import org.eclipse.swt.widgets.Label;

import org.eclipse.swt.widgets.Text;

/**

 * Composite for entering the graph's threshold value. This is intended to go

 * onto the GraphSettingsDialog.

 */

public class GraphSettingsThresholdComposite extends Composite {

	private static final String B = "b";

	private static final String GB = "gb";

	private static final String BYTE = "byte";

	private static final String BYTES = "bytes";

	private static final String MB = "mb";

	private static final String KB = "kb";

	private static final String DIALOG_MESSAGE = "Only show allocations on the graph which are";

	private static final String ABOVE = "above or equals the threshold";

	private static final String BELOW = "below or equals the threshold";

	private static final String DIALOG_MESSAGE2 = "Examples for valid entries are 20B, 4KB, or 1MB.  Leaving the value empty will clear the threshold.";

	private static final String THRESHOLD_LABEL = "Threshold:";

	private static final String INVALID_INPUT_VALUE = "Invalid input value.";

	private static final String OUT_OF_RANGE_VALUE = "The value is out of range.";

	private GraphSettingsDialog parentDialog;

	private boolean aboveValue;

	private IInputValidator validator;

	/** Threshold Value text entry widget */

	private Text text;

	private String value;

	/** Error message label widget. */

	private Text errorMessageText;

	private Button radioAbove;

	/**

	 * Constructor

	 * 

	 * @param parent

	 *            the parent composite

	 * @param parentDialog

	 *            The calling dialog

	 * @param oldThreshold

	 *            previous threshold value as user entered it

	 * @param above

	 *            true if previous threshold was filtering "above" the threshold

	 */

	public GraphSettingsThresholdComposite(Composite parent,

			GraphSettingsDialog parentDialog, String oldThreshold, boolean above) {

		super(parent, SWT.NONE);

		this.parentDialog = parentDialog;

		value = oldThreshold == null ? "" : oldThreshold;

		aboveValue = above;

		validator = new ThresholdEntryValidator();

	}

	/**

	 * Creates the content of this composite

	 */

	public void createControl() {

		setLayout(GridLayoutFactory.fillDefaults().create());

		Group group = new Group(this, SWT.NONE);

		group.setText("Graph Threshold");

		group.setLayout(GridLayoutFactory.fillDefaults().numColumns(3).margins(

				10, 10).equalWidth(false).create());

		GridDataFactory.fillDefaults().hint(350, SWT.DEFAULT).applyTo(group);

		Label message = new Label(group, SWT.WRAP);

		message.setText(DIALOG_MESSAGE);

		GridDataFactory.fillDefaults().align(SWT.FILL, SWT.CENTER).span(3, 1)

				.grab(true, true).applyTo(message);

		radioAbove = new Button(group, SWT.RADIO);

		radioAbove.setText(ABOVE);

		radioAbove.setSelection(aboveValue);

		GridDataFactory.fillDefaults().span(3, 1).indent(10, 0).applyTo(

				radioAbove);

		Button radioBelow = new Button(group, SWT.RADIO);

		radioBelow.setText(BELOW);

		radioBelow.setSelection(!aboveValue);

		GridDataFactory.fillDefaults().span(3, 1).indent(10, 0).applyTo(

				radioBelow);

		Label thresholdLabel = new Label(group, SWT.NONE);

		thresholdLabel.setText(THRESHOLD_LABEL);

		GridDataFactory.swtDefaults().align(SWT.BEGINNING, SWT.CENTER).grab(

				false, false).indent(0, 10).applyTo(thresholdLabel);

		text = new Text(group, SWT.SINGLE | SWT.BORDER);

		GridDataFactory.fillDefaults().indent(0, 7).align(SWT.BEGINNING,

				SWT.END).hint(80, SWT.DEFAULT).applyTo(text);

		text.addModifyListener(new ModifyListener() {

			public void modifyText(ModifyEvent e) {

				validateInput();

			}

		});

		text.setText(value);

		text.setFocus();

		text.selectAll();

		errorMessageText = new Text(group, SWT.READ_ONLY | SWT.WRAP);

		GridDataFactory.fillDefaults().grab(true, false).indent(0, 10).applyTo(

				errorMessageText);

		errorMessageText.setBackground(errorMessageText.getDisplay()

				.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));

		errorMessageText.setForeground(Display.getDefault().getSystemColor(

				SWT.COLOR_RED));

		Label examplesLabel = new Label(group, SWT.WRAP);

		examplesLabel.setText(DIALOG_MESSAGE2);

		GridDataFactory.fillDefaults().span(3, 1).grab(true, false).indent(0,

				10).applyTo(examplesLabel);

		validateInput();

	}

	private void validateInput() {

		setErrorMessage(validator.isValid(text.getText()));

	}

	/**

	 * Sets or clears the error message. If not <code>null</code>, the OK button

	 * is disabled.

	 * 

	 * @param errorMessage

	 *            the error message, or <code>null</code> to clear

	 * @since 3.0

	 */

	public void setErrorMessage(String errorMessage) {

		if (errorMessageText != null && !errorMessageText.isDisposed()) {

			errorMessageText.setText(errorMessage == null ? "" : errorMessage); //$NON-NLS-1$

			// Disable the error message text control if there is no error, or

			// no error text (empty or whitespace only). Hide it also to avoid

			// color change.

			// See https://bugs.eclipse.org/bugs/show_bug.cgi?id=130281

			boolean hasError = errorMessage != null

					&& (StringConverter.removeWhiteSpaces(errorMessage))

							.length() > 0;

			errorMessageText.setEnabled(hasError);

			errorMessageText.setVisible(hasError);

			errorMessageText.getParent().update();

			Control button = parentDialog.getOkButton();

			if (button != null) {

				button.setEnabled(errorMessage == null);

			}

		}

	}

	private static long parseValue(String value) throws NumberFormatException {

		String tmpVal = value.trim().toLowerCase();

		int factor = 1;

		if (tmpVal.endsWith(KB)) {

			tmpVal = tmpVal.substring(0, tmpVal.lastIndexOf(KB)).trim();

			factor = 1024;

		} else if (tmpVal.endsWith(MB)) {

			tmpVal = tmpVal.substring(0, tmpVal.lastIndexOf(MB)).trim();

			factor = 1024 * 1024;

		} else if (tmpVal.endsWith(BYTES)) {

			tmpVal = tmpVal.substring(0, tmpVal.lastIndexOf(BYTES)).trim();

		} else if (tmpVal.endsWith(BYTE)) {

			tmpVal = tmpVal.substring(0, tmpVal.lastIndexOf(BYTE)).trim();

		} else if (tmpVal.endsWith(GB)) {

			tmpVal = tmpVal.substring(0, tmpVal.lastIndexOf(GB)).trim();

			factor = 1024 * 1024 * 1024;

		} else if (tmpVal.endsWith(B)) {

			tmpVal = tmpVal.substring(0, tmpVal.lastIndexOf(B)).trim();

		}

		return Long.parseLong(tmpVal) * factor;

	}

	/**

	 * Returns the threshold value as entered by the user

	 * 

	 * @return the threshold value as entered by the user

	 */

	public String getThresholdString() {

		return value;

	};

	/**

	 * Returns the threshold value in bytes

	 * 

	 * @return the threshold value in bytes

	 */

	public long getThreshold() {

		if (value == null || value.length() == 0) {

			return 0;

		}

		return parseValue(value);

	}

	/**

	 * Returns filtering direction for threshold, true for

	 * "above and equals threshold", false for "below and equals threshold"

	 * 

	 * @return

	 */

	public boolean getAbove() {

		return aboveValue;

	}

	/**

	 * Called from the dialog's buttonPressed() method

	 * 

	 * @param buttonId

	 *            the ID of the button that was pressed

	 */

	public void buttonPressed(int buttonId) {

		value = buttonId == IDialogConstants.OK_ID ? text.getText() : null;

		aboveValue = radioAbove.getSelection();

	}

	/**

	 * This class validates the user-entered threshold value

	 * 

	 */

	class ThresholdEntryValidator implements IInputValidator {

		/*

		 * (non-Javadoc)

		 * 

		 * @see

		 * org.eclipse.jface.dialogs.IInputValidator#isValid(java.lang.String)

		 */

		public String isValid(String newText) {

			if (newText.length() == 0) {

				return null;

			}

			try {

				long value = parseValue(newText);

				if (value < 0 || value > 4294967296L) {

					return OUT_OF_RANGE_VALUE;

				}

			} catch (NumberFormatException e) {

				return INVALID_INPUT_VALUE;

			}

			return null;

		}

	}

}