/*******************************************************************************
 * Copyright (c) 2000, 2010 QNX Software Systems 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:
 *     QNX Software Systems - Initial API and implementation
 *******************************************************************************/

package org.eclipse.cdt.debug.mi.internal.ui;

import java.util.Observable;

import org.eclipse.cdt.debug.mi.core.IGDBServerMILaunchConfigurationConstants;
import org.eclipse.cdt.debug.mi.internal.ui.dialogfields.ComboDialogField;
import org.eclipse.cdt.debug.mi.internal.ui.dialogfields.DialogField;
import org.eclipse.cdt.debug.mi.internal.ui.dialogfields.IDialogFieldListener;
import org.eclipse.cdt.debug.mi.internal.ui.dialogfields.LayoutUtil;
import org.eclipse.cdt.debug.mi.internal.ui.dialogfields.StringDialogField;
import org.eclipse.cdt.utils.ui.controls.ControlFactory;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
import org.eclipse.jface.layout.PixelConverter;
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.Shell;

public class SerialPortSettingsBlock extends Observable {

	private final static String DEFAULT_ASYNC_DEVICE = "/dev/ttyS0"; //$NON-NLS-1$

	private final static String DEFAULT_ASYNC_DEVICE_SPEED = "115200"; //$NON-NLS-1$

	private Shell fShell;

	private StringDialogField fDeviceField;

	private ComboDialogField fSpeedField;

	private String fSpeedChoices[] = { "9600", "19200", "38400", "57600", "115200" }; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$

	private Control fControl;

	private String fErrorMessage = null;

	public SerialPortSettingsBlock() {
		super();
		fDeviceField = createDeviceField();
		fSpeedField = createSpeedField();
	}

	public void createBlock( Composite parent ) {
		fShell = parent.getShell();
		Composite comp = ControlFactory.createCompositeEx( parent, 2, GridData.FILL_BOTH );
		((GridLayout)comp.getLayout()).makeColumnsEqualWidth = false;
		((GridLayout)comp.getLayout()).marginHeight = 0;
		((GridLayout)comp.getLayout()).marginWidth = 0;
		comp.setFont( parent.getFont() );
		PixelConverter converter = new PixelConverter( comp );
		fDeviceField.doFillIntoGrid( comp, 2 );
		LayoutUtil.setWidthHint( fDeviceField.getTextControl( null ), converter.convertWidthInCharsToPixels( 20 ) );
		fSpeedField.doFillIntoGrid( comp, 2 );
		((GridData)fSpeedField.getComboControl( null ).getLayoutData()).horizontalAlignment = GridData.BEGINNING;
		setControl( comp );
	}

	protected Shell getShell() {
		return fShell;
	}

	public void dispose() {
		deleteObservers();
	}

	public void initializeFrom( ILaunchConfiguration configuration ) {
		initializeDevice( configuration );
		initializeSpeed( configuration );
	}

	public void setDefaults( ILaunchConfigurationWorkingCopy configuration ) {
		configuration.setAttribute( IGDBServerMILaunchConfigurationConstants.ATTR_DEV, DEFAULT_ASYNC_DEVICE );
		configuration.setAttribute( IGDBServerMILaunchConfigurationConstants.ATTR_DEV_SPEED, DEFAULT_ASYNC_DEVICE_SPEED );
	}

	public void performApply( ILaunchConfigurationWorkingCopy configuration ) {
		if ( fDeviceField != null )
			configuration.setAttribute( IGDBServerMILaunchConfigurationConstants.ATTR_DEV, fDeviceField.getText().trim() );
		if ( fSpeedField != null ) {
			int index = fSpeedField.getSelectionIndex();
			configuration.setAttribute( IGDBServerMILaunchConfigurationConstants.ATTR_DEV_SPEED, getSpeedItem( index ) );
		}
	}

	private StringDialogField createDeviceField() {
		StringDialogField field = new StringDialogField();
		field.setLabelText( MIUIMessages.getString( "SerialPortSettingsBlock.0" ) ); //$NON-NLS-1$
		field.setDialogFieldListener( new IDialogFieldListener() {

			@Override
			public void dialogFieldChanged( DialogField f ) {
				deviceFieldChanged();
			}
		} );
		return field;
	}

	private ComboDialogField createSpeedField() {
		ComboDialogField field = new ComboDialogField( SWT.DROP_DOWN | SWT.READ_ONLY );
		field.setLabelText( MIUIMessages.getString( "SerialPortSettingsBlock.1" ) ); //$NON-NLS-1$
		field.setItems( fSpeedChoices );
		field.setDialogFieldListener( new IDialogFieldListener() {

			@Override
			public void dialogFieldChanged( DialogField f ) {
				speedFieldChanged();
			}
		} );
		return field;
	}

	protected void deviceFieldChanged() {
		updateErrorMessage();
		setChanged();
		notifyObservers();
	}

	protected void speedFieldChanged() {
		updateErrorMessage();
		setChanged();
		notifyObservers();
	}

	private void initializeDevice( ILaunchConfiguration configuration ) {
		if ( fDeviceField != null ) {
			try {
				fDeviceField.setText( configuration.getAttribute( IGDBServerMILaunchConfigurationConstants.ATTR_DEV, DEFAULT_ASYNC_DEVICE ) );
			}
			catch( CoreException e ) {
			}
		}
	}

	private void initializeSpeed( ILaunchConfiguration configuration ) {
		if ( fSpeedField != null ) {
			int index = 0;
			try {
				index = getSpeedItemIndex( configuration.getAttribute( IGDBServerMILaunchConfigurationConstants.ATTR_DEV_SPEED, DEFAULT_ASYNC_DEVICE_SPEED ) );
			}
			catch( CoreException e ) {
			}
			fSpeedField.selectItem( index );
		}
	}

	private String getSpeedItem( int index ) {
		return (index >= 0 && index < fSpeedChoices.length) ? fSpeedChoices[index] : null;
	}

	private int getSpeedItemIndex( String item ) {
		for( int i = 0; i < fSpeedChoices.length; ++i )
			if ( fSpeedChoices[i].equals( item ) )
				return i;
		return 0;
	}

	public Control getControl() {
		return fControl;
	}

	protected void setControl( Control control ) {
		fControl = control;
	}

	public boolean isValid( ILaunchConfiguration configuration ) {
		updateErrorMessage();
		return (getErrorMessage() == null);
	}

	private void updateErrorMessage() {
		setErrorMessage( null );
		if ( fDeviceField != null && fSpeedField != null ) {
			if ( fDeviceField.getText().trim().length() == 0 )
				setErrorMessage( MIUIMessages.getString( "SerialPortSettingsBlock.2" ) ); //$NON-NLS-1$
			else if ( !deviceIsValid( fDeviceField.getText().trim() ) )
				setErrorMessage( MIUIMessages.getString( "SerialPortSettingsBlock.3" ) ); //$NON-NLS-1$
			else if ( fSpeedField.getSelectionIndex() < 0 )
				setErrorMessage( MIUIMessages.getString( "SerialPortSettingsBlock.4" ) ); //$NON-NLS-1$
		}
	}

	public String getErrorMessage() {
		return fErrorMessage;
	}

	private void setErrorMessage( String string ) {
		fErrorMessage = string;
	}

	private boolean deviceIsValid( String hostName ) {
		return true;
	}
}
