/*******************************************************************************
 * Copyright (c) 2000, 2015 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.debug.ui.launchConfigurations;

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
import org.eclipse.debug.internal.ui.SWTFactory;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.debug.ui.IJavaDebugHelpContextIds;
import org.eclipse.jdt.internal.debug.ui.JDIDebugUIPlugin;
import org.eclipse.jdt.internal.debug.ui.launcher.AbstractJavaMainTab;
import org.eclipse.jdt.internal.debug.ui.launcher.LauncherMessages;
import org.eclipse.jdt.launching.IJavaLaunchConfigurationConstants;
import org.eclipse.jdt.launching.IVMConnector;
import org.eclipse.jdt.launching.JavaRuntime;
import org.eclipse.jface.preference.BooleanFieldEditor;
import org.eclipse.jface.preference.ComboFieldEditor;
import org.eclipse.jface.preference.FieldEditor;
import org.eclipse.jface.preference.IntegerFieldEditor;
import org.eclipse.jface.preference.PreferenceStore;
import org.eclipse.jface.preference.StringFieldEditor;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Group;
import org.eclipse.ui.PlatformUI;

import com.sun.jdi.connect.Connector;

/**
 * A launch configuration tab that displays and edits the project associated
 * with a remote connection and the connector used to connect to a remote
 * VM.
 * <p>
 * This class may be instantiated.
 * </p>
 * @since 2.0
 * @noextend This class is not intended to be sub-classed by clients.
 */
public class JavaConnectTab extends AbstractJavaMainTab implements IPropertyChangeListener {

	// UI widgets
	private Button fAllowTerminateButton;
	private Map<String, Connector.Argument> fArgumentMap;
	private Map<String, FieldEditor> fFieldEditorMap = new HashMap<>();
	private Composite fArgumentComposite;
	private Combo fConnectorCombo;

	// the selected connector
	private IVMConnector fConnector;
	private IVMConnector[] fConnectors = JavaRuntime.getVMConnectors();

	/* (non-Javadoc)
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#createControl(org.eclipse.swt.widgets.Composite)
	 */
	@Override
	public void createControl(Composite parent) {
		Font font = parent.getFont();
		Composite comp = SWTFactory.createComposite(parent, font, 1, 1, GridData.FILL_BOTH);
		GridLayout layout = new GridLayout();
		layout.verticalSpacing = 0;
		comp.setLayout(layout);
		createProjectEditor(comp);
		createVerticalSpacer(comp, 1);

	//connection type
		Group group = SWTFactory.createGroup(comp, LauncherMessages.JavaConnectTab_Connect_ion_Type__7, 1, 1, GridData.FILL_HORIZONTAL);
		String[] names = new String[fConnectors.length];
		for (int i = 0; i < fConnectors.length; i++) {
			names[i] = fConnectors[i].getName();
		}
		fConnectorCombo = SWTFactory.createCombo(group, SWT.READ_ONLY, 1, GridData.FILL_HORIZONTAL, names);
		fConnectorCombo.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				handleConnectorComboModified();
			}
		});
		createVerticalSpacer(comp, 1);

	//connection properties
		group = SWTFactory.createGroup(comp, LauncherMessages.JavaConnectTab_Connection_Properties_1, 2, 1, GridData.FILL_HORIZONTAL);
		Composite cgroup = SWTFactory.createComposite(group, font, 2, 1, GridData.FILL_HORIZONTAL);
		fArgumentComposite = cgroup;
		createVerticalSpacer(comp, 2);
		fAllowTerminateButton = createCheckButton(comp, LauncherMessages.JavaConnectTab__Allow_termination_of_remote_VM_6);
		fAllowTerminateButton.addSelectionListener(getDefaultListener());

		setControl(comp);
		PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(), IJavaDebugHelpContextIds.LAUNCH_CONFIGURATION_DIALOG_CONNECT_TAB);
	}

	/**
	 * Update the argument area to show the selected connector's arguments
	 */
	private void handleConnectorComboModified() {
		int index = fConnectorCombo.getSelectionIndex();
		if ( (index < 0) || (index >= fConnectors.length) ) {
			return;
		}
		IVMConnector vm = fConnectors[index];
		if (vm.equals(fConnector)) {
			return; // selection did not change
		}
		fConnector = vm;
		try {
			fArgumentMap = vm.getDefaultArguments();
		} catch (CoreException e) {
			JDIDebugUIPlugin.statusDialog(LauncherMessages.JavaConnectTab_Unable_to_display_connection_arguments__2, e.getStatus());
			return;
		}

		// Dispose of any current child widgets in the tab holder area
		Control[] children = fArgumentComposite.getChildren();
		for (int i = 0; i < children.length; i++) {
			children[i].dispose();
		}
		fFieldEditorMap.clear();
		PreferenceStore store = new PreferenceStore();
		// create editors
		Iterator<String> keys = vm.getArgumentOrder().iterator();
		while (keys.hasNext()) {
			String key = keys.next();
			Connector.Argument arg = fArgumentMap.get(key);
			FieldEditor field = null;
			if (arg instanceof Connector.IntegerArgument) {
				store.setDefault(arg.name(), ((Connector.IntegerArgument)arg).intValue());
				field = new IntegerFieldEditor(arg.name(), arg.label(), fArgumentComposite);
			} else if (arg instanceof Connector.SelectedArgument) {
				List<String> choices = ((Connector.SelectedArgument)arg).choices();
				String[][] namesAndValues = new String[choices.size()][2];
				Iterator<String> iter = choices.iterator();
				int count = 0;
				while (iter.hasNext()) {
					String choice = iter.next();
					namesAndValues[count][0] = choice;
					namesAndValues[count][1] = choice;
					count++;
				}
				store.setDefault(arg.name(), arg.value());
				field = new ComboFieldEditor(arg.name(), arg.label(), namesAndValues, fArgumentComposite);
			} else if (arg instanceof Connector.StringArgument) {
				store.setDefault(arg.name(), arg.value());
				field = new StringFieldEditor(arg.name(), arg.label(), fArgumentComposite);
			} else if (arg instanceof Connector.BooleanArgument) {
				store.setDefault(arg.name(), ((Connector.BooleanArgument)arg).booleanValue());
				field = new BooleanFieldEditor(arg.name(), arg.label(), fArgumentComposite);
			}
			if(field != null) {
				field.setPreferenceStore(store);
				field.loadDefault();
				field.setPropertyChangeListener(this);
				fFieldEditorMap.put(key, field);
			}
		}
		fArgumentComposite.getParent().getParent().layout();
		fArgumentComposite.layout(true);
		updateLaunchConfigurationDialog();
	}

	 /* (non-Javadoc)
	 * @see org.eclipse.jdt.internal.debug.ui.launcher.AbstractJavaMainTab#initializeFrom(org.eclipse.debug.core.ILaunchConfiguration)
	 */
	@Override
	public void initializeFrom(ILaunchConfiguration config) {
		super.initializeFrom(config);
		updateAllowTerminateFromConfig(config);
		updateConnectionFromConfig(config);
	}

	/**
	 * Updates the state of the allow terminate check button from the specified configuration
	 * @param config the config to load from
	 */
	private void updateAllowTerminateFromConfig(ILaunchConfiguration config) {
		boolean allowTerminate = false;
		try {
			allowTerminate = config.getAttribute(IJavaLaunchConfigurationConstants.ATTR_ALLOW_TERMINATE, false);
		}
		catch (CoreException ce) {JDIDebugUIPlugin.log(ce);}
		fAllowTerminateButton.setSelection(allowTerminate);
	}

	/**
	 * Updates the connection argument field editors from the specified configuration
	 * @param config the config to load from
	 */
	private void updateConnectionFromConfig(ILaunchConfiguration config) {
		String id = null;
		try {
			id = config.getAttribute(IJavaLaunchConfigurationConstants.ATTR_VM_CONNECTOR, JavaRuntime.getDefaultVMConnector().getIdentifier());
			fConnectorCombo.setText(JavaRuntime.getVMConnector(id).getName());
			handleConnectorComboModified();

			Map<String, String> attrMap = config.getAttribute(IJavaLaunchConfigurationConstants.ATTR_CONNECT_MAP, (Map<String, String>)null);
			if (attrMap == null) {
				return;
			}
			Iterator<String> keys = attrMap.keySet().iterator();
			while (keys.hasNext()) {
				String key = keys.next();
				Connector.Argument arg = fArgumentMap.get(key);
				FieldEditor editor = fFieldEditorMap.get(key);
				if (arg != null && editor != null) {
					String value = attrMap.get(key);
					if (arg instanceof Connector.StringArgument || arg instanceof Connector.SelectedArgument) {
						editor.getPreferenceStore().setValue(key, value);
					}
					else if (arg instanceof Connector.BooleanArgument) {
						editor.getPreferenceStore().setValue(key, Boolean.valueOf(value).booleanValue());
					}
					else if (arg instanceof Connector.IntegerArgument) {
						editor.getPreferenceStore().setValue(key, new Integer(value).intValue());
					}
					editor.load();
				}
			}
		}
		catch (CoreException ce) {JDIDebugUIPlugin.log(ce);}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#performApply(org.eclipse.debug.core.ILaunchConfigurationWorkingCopy)
	 */
	@Override
	public void performApply(ILaunchConfigurationWorkingCopy config) {
		config.setAttribute(IJavaLaunchConfigurationConstants.ATTR_PROJECT_NAME, fProjText.getText().trim());
		config.setAttribute(IJavaLaunchConfigurationConstants.ATTR_ALLOW_TERMINATE, fAllowTerminateButton.getSelection());
		config.setAttribute(IJavaLaunchConfigurationConstants.ATTR_VM_CONNECTOR, getSelectedConnector().getIdentifier());
		mapResources(config);
		Map<String, String> attrMap = new HashMap<>(fFieldEditorMap.size());
		Iterator<String> keys = fFieldEditorMap.keySet().iterator();
		while (keys.hasNext()) {
			String key = keys.next();
			FieldEditor editor = fFieldEditorMap.get(key);
			if (!editor.isValid()) {
				return;
			}
			Connector.Argument arg = fArgumentMap.get(key);
			editor.store();
			if (arg instanceof Connector.StringArgument || arg instanceof Connector.SelectedArgument) {
				attrMap.put(key, editor.getPreferenceStore().getString(key));
			}
			else if (arg instanceof Connector.BooleanArgument) {
				attrMap.put(key, Boolean.valueOf(editor.getPreferenceStore().getBoolean(key)).toString());
			}
			else if (arg instanceof Connector.IntegerArgument) {
				attrMap.put(key, new Integer(editor.getPreferenceStore().getInt(key)).toString());
			}
		}
		config.setAttribute(IJavaLaunchConfigurationConstants.ATTR_CONNECT_MAP, attrMap);
	}

	/**
	 * Initialize default settings for the given Java element
	 * @param javaElement the Java element
	 * @param config the configuration
	 */
	private void initializeDefaults(IJavaElement javaElement, ILaunchConfigurationWorkingCopy config) {
		initializeJavaProject(javaElement, config);
		initializeName(javaElement, config);
		initializeHardCodedDefaults(config);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#setDefaults(org.eclipse.debug.core.ILaunchConfigurationWorkingCopy)
	 */
	@Override
	public void setDefaults(ILaunchConfigurationWorkingCopy config) {
		IJavaElement javaElement = getContext();
		if (javaElement == null) {
			initializeHardCodedDefaults(config);
		}
		else {
			initializeDefaults(javaElement, config);
		}
	}

	/**
	 * Find the first instance of a type, compilation unit, class file or project in the
	 * specified element's parental hierarchy, and use this as the default name.
	 * @param javaElement the Java element
	 * @param config the configuration
	 */
	private void initializeName(IJavaElement javaElement, ILaunchConfigurationWorkingCopy config) {
		String name = EMPTY_STRING;
		try {
			IResource resource = javaElement.getUnderlyingResource();
			if (resource != null) {
				name = resource.getName();
				int index = name.lastIndexOf('.');
				if (index > 0) {
					name = name.substring(0, index);
				}
			}
			else {
				name= javaElement.getElementName();
			}
			name = getLaunchConfigurationDialog().generateName(name);
		}
		catch (JavaModelException jme) {JDIDebugUIPlugin.log(jme);}
		config.rename(name);
	}

	/**
	 * Initialize those attributes whose default values are independent of any context.
	 * @param config the configuration
	 */
	private void initializeHardCodedDefaults(ILaunchConfigurationWorkingCopy config) {
		config.setAttribute(IJavaLaunchConfigurationConstants.ATTR_ALLOW_TERMINATE, false);
		config.setAttribute(IJavaLaunchConfigurationConstants.ATTR_VM_CONNECTOR, JavaRuntime.getDefaultVMConnector().getIdentifier());
	}

	 /* (non-Javadoc)
	 * @see org.eclipse.debug.ui.AbstractLaunchConfigurationTab#isValid(org.eclipse.debug.core.ILaunchConfiguration)
	 */
	@Override
	public boolean isValid(ILaunchConfiguration config) {
		setErrorMessage(null);
		setMessage(null);
		String name = fProjText.getText().trim();
		if (name.length() > 0) {
			if (!ResourcesPlugin.getWorkspace().getRoot().getProject(name).exists()) {
				setErrorMessage(LauncherMessages.JavaConnectTab_Project_does_not_exist_14);
				return false;
			}
		}
		Iterator<String> keys = fFieldEditorMap.keySet().iterator();
		while (keys.hasNext()) {
			String key = keys.next();
			Connector.Argument arg = fArgumentMap.get(key);
			FieldEditor editor = fFieldEditorMap.get(key);
			if (editor instanceof StringFieldEditor) {
				String value = ((StringFieldEditor)editor).getStringValue();
				if (!arg.isValid(value)) {
					setErrorMessage(arg.label() + LauncherMessages.JavaConnectTab__is_invalid__5);
					return false;
				}
			}
		}
		return true;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#getName()
	 */
	@Override
	public String getName() {
		return LauncherMessages.JavaConnectTab_Conn_ect_20;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.ui.AbstractLaunchConfigurationTab#getImage()
	 */
	@Override
	public Image getImage() {
		return DebugUITools.getImage(IDebugUIConstants.IMG_LCL_DISCONNECT);
	}

	/**
	 * @see org.eclipse.debug.ui.AbstractLaunchConfigurationTab#getId()
	 *
	 * @since 3.3
	 */
	@Override
	public String getId() {
		return "org.eclipse.jdt.debug.ui.javaConnectTab"; //$NON-NLS-1$
	}

	/**
	 * Returns the selected connector
	 * @return the selected {@link IVMConnector}
	 */
	private IVMConnector getSelectedConnector() {
		return fConnector;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
	 */
	@Override
	public void propertyChange(PropertyChangeEvent event) {
		updateLaunchConfigurationDialog();
	}
}