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 java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.TreeSet;

import org.apache.log4j.Logger;
import org.openslx.dozmod.gui.Gui;
import org.openslx.dozmod.gui.helper.MessageType;
import org.openslx.dozmod.gui.helper.TextChangeListener;
import org.openslx.dozmod.gui.helper.UiFeedback;
import org.openslx.dozmod.gui.window.layout.VirtConfigEditorWindowLayout;
import org.openslx.dozmod.thrift.ImageDetailsActions;
import org.openslx.dozmod.thrift.ImageDetailsActions.VirtConfCallback;
import org.openslx.dozmod.thrift.cache.MetaDataCache;
import org.openslx.util.XmlHelper;
import org.openslx.util.vm.VboxMetaData;
import org.openslx.util.vm.VmMetaData;
import org.openslx.util.vm.VmwareConfig;

@SuppressWarnings("serial")
public class VirtConfigEditorWindow extends VirtConfigEditorWindowLayout implements UiFeedback {

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

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

	private final String imageVersionId;
	private final String originalMachineDescription;
	private final VirtConfigEditorWindow me = this;
	private final ImageDetailsActions actionHandler;

	private boolean configWasSaved = false;

	protected VirtConfigEditorWindow(Window modalParent, final ImageDetailsActions actionHandler,
			final String imageVersionId, final String currentMachineDescription,
			final String originalmachineDescription) {
		super(modalParent);

		this.actionHandler = actionHandler;
		this.imageVersionId = imageVersionId;
		// listener for the text fields
		pnlEditor.getDocument().addDocumentListener(new TextChangeListener() {
			@Override
			public void changed() {
				btnSave.setEnabled(!originalMachineDescription.equals(pnlEditor.getText()));
			}
		});

		btnSave.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				saveClicked();
			}
		});

		btnCancel.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				safeClose();
			}
		});
		// for vbox, originalMachineDescription is unformatted, the new one will be though
		// save original description for later use
		this.originalMachineDescription = XmlHelper.getFormattedXml(
				new ByteArrayInputStream(originalmachineDescription.getBytes(StandardCharsets.UTF_8)));
		pnlEditor.setText(currentMachineDescription);
		pnlEditor.setCaretPosition(0);
	}

	private void saveClicked() {
		// we make use of the fact that we saved the BB here!
		final String userInput = pnlEditor.getText();
		byte[] uiBytes = userInput.getBytes(StandardCharsets.ISO_8859_1);
		Charset cs = VmwareConfig.getCharset(uiBytes, uiBytes.length);
		// cs is now either the detected encoding, or latin1 as a default
		uiBytes = userInput.getBytes(cs);
		// now we should have the correct bytes...
		VmMetaData<?, ?, ?, ?> metaCandidate = null;
		try {
			metaCandidate = VmMetaData.getInstance(MetaDataCache.getOperatingSystems(), uiBytes,
					uiBytes.length);
		} catch (IOException e) {
			LOGGER.error("Could not get VmMetaData instance from given machine description: ", e);
		}
		if (metaCandidate == null) {
			dispose();
			return;
		}

		byte[] uiBytesFiltered = metaCandidate.getDefinitionArray();
		final String userInputFiltered;
		if (metaCandidate instanceof VboxMetaData) {
			userInputFiltered = XmlHelper.getFormattedXml(new ByteArrayInputStream(uiBytesFiltered));
		} else {
			userInputFiltered = new String(uiBytesFiltered, cs);
		}
		// So here we have:
		// - uiBytes is the unfiltered user input
		// - uiBytesFiltered is the user input filtered by VmwareMetaData
		TreeSet<String> unfilteredSet = stringToTreeSet(userInput);
		TreeSet<String> filteredSet = stringToTreeSet(userInputFiltered);
		if (!filteredSet.equals(unfilteredSet)) {
			unfilteredSet.removeAll(filteredSet);
			// not equals, means there was some invalid input
			String errorText = "Invalide Eingaben:\n";
			for (String s : unfilteredSet) {
				errorText += s + "\n";
			}
			errorText += System.lineSeparator()
					+ "Wollen Sie trotzdem speichern? (Die invaliden Zeilen werden dabei automatisch gelöscht.)";
			if (!Gui.showMessageBox(errorText, MessageType.ERROR_RETRY, LOGGER, null))
				return;
		}
		ByteBuffer toSave;
		if (metaCandidate instanceof VboxMetaData) {
			String unformattedInput = XmlHelper.getUnformattedXml(new ByteArrayInputStream(uiBytesFiltered));
			toSave = ByteBuffer.wrap(unformattedInput.getBytes(cs));
		} else {
			toSave = ByteBuffer.wrap(uiBytesFiltered);
		}
		// we have a valid vmx or the user accepted to push the filtered input
		actionHandler.setVirtualizerConfig(imageVersionId, toSave, new VirtConfCallback() {
			@Override
			public void virtConfCallback(boolean success) {
				if (success) {
					configWasSaved = true;
					dispose();
				}
			}
		});
	}

	private TreeSet<String> stringToTreeSet(final String s) {
		String[] split = s.split("[\\r\\n]+");
		List<String> splitList = new ArrayList<String>(Arrays.asList(split));
		splitList.removeAll(Arrays.asList("", null));
		TreeSet<String> set = new TreeSet<String>(splitList);
		return set;
	}

	public static boolean open(Window modalParent, final ImageDetailsActions handler,
			final String imageVersionId, final String currentmachineDescription,
			final String originalMachineDescription) {
		VirtConfigEditorWindow win = new VirtConfigEditorWindow(modalParent, handler, imageVersionId,
				currentmachineDescription, originalMachineDescription);
		win.setVisible(true);
		return win.configWasSaved;
	}

	private void safeClose() {
		if (originalMachineDescription.equals(pnlEditor.getText()) || Gui.showMessageBox(me,
				"Ihre Änderungen, in diesem Fenster, werden verloren gehen, wollen Sie trotzdem abbrechen?",
				MessageType.QUESTION_YESNO, null, null))
			dispose();
	}

	@Override
	public boolean wantConfirmQuit() {
		return !originalMachineDescription.equals(pnlEditor.getText());
	}

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