package org.openslx.dozmod.gui.window;

import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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.ThriftUtil;
import org.openslx.util.vm.VmwareConfig;
import org.openslx.util.vm.VmwareMetaData;


@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 ByteBuffer originalMachineDescription;
	private final VirtConfigEditorWindow me = this;
	private final ImageDetailsActions actionHandler;
	protected VirtConfigEditorWindow(Window modalParent, final ImageDetailsActions actionHandler, final String imageVersionId, final ByteBuffer machineDescription) {
		super(modalParent);
		this.originalMachineDescription = machineDescription;
		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();
			}
		});
		// now build the editor's content from the given buffer
		String mdString = ThriftUtil.byteBufferToString(machineDescription);
		// finally set the editor's content to the vmx
		pnlEditor.setText(mdString);
		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....
		VmwareMetaData meta = new VmwareMetaData(MetaDataCache.getOperatingSystems(), uiBytes, uiBytes.length);
		byte[] uiBytesFiltered = meta.getDefinitionArray();
		final String 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:" + System.lineSeparator();
			for (String s : unfilteredSet) {
				errorText += s + System.lineSeparator();
			}
			errorText += System.lineSeparator() + "Wollen Sie trotzdem speichern? (Die invaliden Zeilen werden dabei automatisch gelöscht.)";
			if (!Gui.showMessageBox(errorText, MessageType.ERROR_RETRY, LOGGER, null))
				return;
		}
		// we have a valid vmx or the user accepted to push the filtered input
		actionHandler.setVirtualizerConfig(imageVersionId, ByteBuffer.wrap(uiBytesFiltered), new VirtConfCallback() {
			@Override
			public void virtConfCallback(boolean success) {
				if (success) {
					dispose();
				}
			}
		});
	}
	private TreeSet<String> stringToTreeSet(final String s) {
		String[] split = s.split(System.lineSeparator());
		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 void open(Window modalParent, final ImageDetailsActions handler, final String imageVersionId, final ByteBuffer machineDescription) {
		VirtConfigEditorWindow win = new VirtConfigEditorWindow(modalParent, handler, imageVersionId, machineDescription);
		win.setVisible(true);
	}

	private void safeClose() {
		if (ThriftUtil.byteBufferToString(originalMachineDescription).equals(pnlEditor.getText()) ||
				Gui.showMessageBox(me, "Ihre Änderungen 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();
	}

}