package org.openslx.dozmod.gui.window;

import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;

import org.apache.log4j.Logger;
import org.openslx.dozmod.gui.Gui;
import org.openslx.dozmod.gui.helper.MessageType;
import org.openslx.dozmod.gui.helper.UiFeedback;
import org.openslx.dozmod.gui.window.layout.VirtDropDownConfigEditorWindowLayout;
import org.openslx.dozmod.thrift.ImageDetailsActions;
import org.openslx.dozmod.thrift.ImageDetailsActions.VirtConfCallback;
import org.openslx.dozmod.thrift.cache.MetaDataCache;
import org.openslx.util.ThriftUtil;
import org.openslx.util.XmlHelper;
import org.openslx.util.vm.VboxMetaData;
import org.openslx.util.vm.VmMetaData;
import org.openslx.util.vm.VmMetaData.DDAcceleration;
import org.openslx.util.vm.VmMetaData.EthernetDevType;
import org.openslx.util.vm.VmMetaData.HWVersion;
import org.openslx.util.vm.VmMetaData.SoundCardType;
import org.openslx.util.vm.VmMetaData.UsbSpeed;

@SuppressWarnings("serial")
public class VirtDropDownConfigEditorWindow extends VirtDropDownConfigEditorWindowLayout
		implements UiFeedback {

	private final static Logger LOGGER = Logger.getLogger(VirtDropDownConfigEditorWindow.class);

	public interface VirtConfigChanged {
		public void virtConfigChanged(String newVmx);
	}

	private final String imageVersionId;
	private final String originalMachineDescription;
	private final VirtDropDownConfigEditorWindow me = this;
	private final VmMetaData<?, ?, ?, ?, ?> meta;
	private final ImageDetailsActions actionHandler;

	protected VirtDropDownConfigEditorWindow(Window modalParent, final ImageDetailsActions actionHandler,
			final String imageVersionId, final ByteBuffer machineDescription) {
		super(modalParent);

		this.actionHandler = actionHandler;
		this.imageVersionId = imageVersionId;

		// and now for the meta data
		VmMetaData<?, ?, ?, ?, ?> metaCandidate = null;
		byte[] machineData = ThriftUtil.unwrapByteBuffer(machineDescription);
		try {
			metaCandidate = VmMetaData.getInstance(MetaDataCache.getOperatingSystems(), machineData,
					machineData.length);
		} catch (IOException e) {
			LOGGER.error("Could not get VmMetaData instance from given machine description: ", e);
		}

		meta = metaCandidate;
		
		if (metaCandidate == null) {
			this.originalMachineDescription = null;
			dispose();
			return;
		}

		initializeSoundBox(meta.getSupportedSoundCards());
		initializeDDABox(meta.getSupportedDDAccs());
		initializeHWVersBox(meta.getSupportedHWVersions());
		initializeEDTBox(meta.getSupportedEthernetDevices());
		initializeUsbBox(meta.getSupportedUsbSpeeds());

		//set the initial state of the buttons
		initializeComboBoxes(meta);

		// listener for the sound card drop box
		cboSound.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				SoundCardType selected = (SoundCardType) cboSound.getSelectedItem();
				meta.setSoundCard(selected);
				btnSave.setEnabled(hasChanged());
			}
		});

		// listener for the 3Dacceleration drop box
		cbo3DAcceleration.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				DDAcceleration selected = (DDAcceleration) cbo3DAcceleration.getSelectedItem();
				meta.setDDAcceleration(selected);
				btnSave.setEnabled(hasChanged());
			}
		});

		// listener for the Hardware version drop box
		cboHWVersion.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				HWVersion selected = (HWVersion) cboHWVersion.getSelectedItem();
				meta.setHWVersion(selected);
				btnSave.setEnabled(hasChanged());
			}
		});

		// listener for the Virtual Ethernet device drop box
		cboE0VirtDev.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				EthernetDevType selected = (EthernetDevType) cboE0VirtDev.getSelectedItem();
				meta.setEthernetDevType(0, selected);
				btnSave.setEnabled(hasChanged());
			}
		});
		
		cboMaxUsbSpeed.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				UsbSpeed selected = (UsbSpeed) cboMaxUsbSpeed.getSelectedItem();
				meta.setMaxUsbSpeed(selected);
				btnSave.setEnabled(hasChanged());
			}
		});

		// listener for the save button
		btnSave.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				saveClicked();
			}
		});

		// listener for the cancel button
		btnCancel.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				safeClose();
			}
		});

		// listener for the expert mode
		btnMore.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				// here we need special logic for formatting vbox file in a human-readable way...
				// we will just format it before sending it to the editor window and reformat it right after...
				String currentMachineDesc;
				if (meta instanceof VboxMetaData)
					currentMachineDesc = XmlHelper
							.getFormattedXml(new ByteArrayInputStream(meta.getDefinitionArray()));
				else
					currentMachineDesc = ThriftUtil
							.byteBufferToString(ByteBuffer.wrap(meta.getDefinitionArray()));
				boolean didSave = VirtConfigEditorWindow.open(me, actionHandler, imageVersionId,
						currentMachineDesc, originalMachineDescription);
				// user did save the changes via the expert mode window - close this one too
				if (didSave) {
					dispose();
				}
			}
		});

		this.originalMachineDescription = ThriftUtil.byteBufferToString(machineDescription);
		btnSave.setEnabled(false);
	}

	/* setting the boxes to their initial value...value is read from the given metaData
	 * @param: given VmwareMetaData
	 */
	private void initializeComboBoxes(VmMetaData<?, ?, ?, ?, ?> m) {
		try {
			SoundCardType SCT = m.getSoundCard();
			cboSound.setSelectedItem(SCT);
			DDAcceleration DDA = m.getDDAcceleration();
			cbo3DAcceleration.setSelectedItem(DDA);
			HWVersion HWV = m.getHWVersion();
			cboHWVersion.setSelectedItem(HWV);
			EthernetDevType E0VD = m.getEthernetDevType(0);
			cboE0VirtDev.setSelectedItem(E0VD);
			UsbSpeed usbSpeed = m.getMaxUsbSpeed();
			cboMaxUsbSpeed.setSelectedItem(usbSpeed);
		} catch (IllegalArgumentException e) {
			// TODO improve user message 
			Gui.showMessageBox("Sie haben beim letzten Konfigurieren \n"
					+ "einen falschen Eintrag eingespeichert. \n" + "Die VM wird nicht starten!",
					MessageType.WARNING, null, e);
		}
	}

	private void saveClicked() {
		// we have a valid vmx or the user accepted to push the filtered input
		actionHandler.setVirtualizerConfig(imageVersionId, ByteBuffer.wrap(meta.getDefinitionArray()),
				new VirtConfCallback() {
					@Override
					public void virtConfCallback(boolean success) {
						if (success) {
							dispose();
						}
					}
				});
	}

	public static void open(Window modalParent, final ImageDetailsActions handler,
			final String imageVersionId, final ByteBuffer machineDescription) {
		VirtDropDownConfigEditorWindow win = new VirtDropDownConfigEditorWindow(modalParent, handler,
				imageVersionId, machineDescription);
		win.setVisible(true);
	}

	private boolean hasChanged() {
		return !originalMachineDescription
				.equals(ThriftUtil.byteBufferToString(ByteBuffer.wrap(meta.getDefinitionArray())));
	}

	private void safeClose() {
		if (!hasChanged() || Gui.showMessageBox(me,
				"Wollen Sie wirklich abbrechen?\n" + "Ihre Änderungen werden verworfen.",
				MessageType.QUESTION_YESNO, null, null)) {
			dispose();
		}
	}

	@Override
	public boolean wantConfirmQuit() {
		return hasChanged();
	}

	@Override
	public void escapePressed() {
		safeClose();
	}
}