package org.openslx.dozmod.gui.configurator;

import java.awt.Color;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.TableModelListener;

import org.apache.log4j.Logger;
import org.openslx.bwlp.thrift.iface.NetShare;
import org.openslx.bwlp.thrift.iface.NetShareAuth;
import org.openslx.dozmod.gui.Gui;
import org.openslx.dozmod.gui.changemonitor.DialogChangeMonitor;
import org.openslx.dozmod.gui.control.ComboBox;
import org.openslx.dozmod.gui.control.ComboBox.ComboBoxRenderer;
import org.openslx.dozmod.gui.control.QLabel;
import org.openslx.dozmod.gui.control.table.CheckListTable.Wrapper;
import org.openslx.dozmod.gui.control.table.NetshareTable;
import org.openslx.dozmod.gui.control.table.QScrollPane;
import org.openslx.dozmod.gui.helper.GridManager;
import org.openslx.dozmod.gui.helper.MessageType;
import org.openslx.dozmod.thrift.cache.MetaDataCache;
import org.openslx.dozmod.util.FormatHelper;

/**
 * Widget for network share configuration of lectures
 */
public class NetshareConfigurator extends NetshareConfiguratorLayout {

	private static final long serialVersionUID = -3336605759245603655L;
	private final static Logger LOGGER = Logger.getLogger(NetshareConfigurator.class);

	public static final Character EMPTY_MARKER = '-';
	public static final String PRINTER_MARKER = "PRINTER";

	// mount points / win drive letters - ideally, we would check whether the image is linux or windows based
	// and either show a drive selection list like this one, or a textfield for a user-defined mount point...
	private Character[] mountPoints = { EMPTY_MARKER, 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
			'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };

	public NetshareConfigurator() {
		super();
		tblNetshare.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
			@Override
			public void valueChanged(ListSelectionEvent e) {
				NetShare item = tblNetshare.getSelectedItem2();
				// only activate form fields if netshare is not predefined
				boolean editable = (item == null || item.shareId == 0);
				// now disable as needed
				btnDel.setEnabled(editable);
				btnAdd.setEnabled(editable);
				tfSharePath.setEnabled(editable);
				tfShareName.setEnabled(editable);
				tfUsername.setEnabled(editable);
				tfPassword.setEnabled(editable);
				cboNetshareAuth.setEnabled(editable);
				cboNetshareMountPoint.setEnabled(editable);
				chkIsPrinter.setEnabled(editable);
				chkShowPass.setEnabled(editable);

				if (item == null) {
					clearInputFields();
					return;
				}

				// first set the fields to let any listener trigger
				tfSharePath.setText(item.path);
				if (item.displayname != null)
					tfShareName.setText(
							String.valueOf(EMPTY_MARKER).equals(item.displayname) ? "" : item.displayname);
				tfUsername.setText(item.username);
				tfPassword.setText(item.password);
				cboNetshareAuth.setSelectedItem(item.auth);
				if (item.mountpoint != null) {
					boolean isPrinter = item.mountpoint.equals(PRINTER_MARKER);
					chkIsPrinter.setSelected(isPrinter);
					cboNetshareMountPoint.setSelectedItem(isPrinter ? null
							: item.mountpoint.isEmpty() ? EMPTY_MARKER
									: Character.valueOf(item.mountpoint.charAt(0)));
					cboNetshareMountPoint.setEnabled(editable && !isPrinter);
				}
				if (editable)
					btnAdd.setText("Ändern");
			}
		});

		cboNetshareMountPoint.setModel(new DefaultComboBoxModel<Character>(mountPoints));
		cboNetshareMountPoint.setSelectedItem(null);

		chkIsPrinter.addItemListener(new ItemListener() {
			public void itemStateChanged(ItemEvent e) {
				cboNetshareMountPoint.setEnabled(e.getStateChange() != ItemEvent.SELECTED);
			}
		});
		chkIsPrinter.setSelected(false);

		// combobox for share authentication types
		cboNetshareAuth.setModel(new DefaultComboBoxModel<NetShareAuth>(NetShareAuth.values()));
		cboNetshareAuth.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				NetShareAuth selectedAuth = cboNetshareAuth.getItemAt(cboNetshareAuth.getSelectedIndex());
				boolean activate = selectedAuth != null && selectedAuth == NetShareAuth.OTHER_USER;
				// username field is needed to either special or guest user 
				tfUsername.setEnabled(activate);
				tfPassword.setEnabled(activate);
				chkShowPass.setEnabled(activate);
			}
		});
		cboNetshareAuth.setSelectedItem(null);

		btnAdd.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				// check if we are editing an existing share entry or
				// creating a new one, check for input either way
				NetShare input = new NetShare();

				input.path = tfSharePath.getText();
				if (input.path == null || input.path.isEmpty()) {
					lblError.setText("Kein Pfad angegeben!");
					return;
				}
				String inputShareName = tfShareName.getText();
				if (inputShareName.isEmpty())
					inputShareName = String.valueOf(EMPTY_MARKER);
				input.displayname = inputShareName;

				NetShareAuth inputNetShareAuth = cboNetshareAuth
						.getItemAt(cboNetshareAuth.getSelectedIndex());
				if (inputNetShareAuth == null) {
					lblError.setText("Kein Authentifizierungstyp angegeben!");
					return;
				}
				input.auth = inputNetShareAuth;
				switch (inputNetShareAuth) {
				case LOGIN_USER:
					// this uses the service client's logged in user
					// we don't need to have anything
					break;
				case OTHER_USER:
					// save given username/password
					input.username = tfUsername.getText();
					input.password = new String(tfPassword.getPassword());
					if (input.username.isEmpty()) {
						lblError.setText("Kein Nutzername angegeben!");
						return;
					}
					break;
				default:
					input = null;
					break;
				}
				if (input == null) {
					lblError.setText("Fehlerhafte Eingabe");
					LOGGER.debug("Bad input, aborting.");
					return;
				}

				// process mount point and printer check box
				Character inputMountPoint = cboNetshareMountPoint
						.getItemAt(cboNetshareMountPoint.getSelectedIndex());
				if (!chkIsPrinter.isSelected()) {
					if (inputMountPoint == null) {
						lblError.setText("Kein Laufwerk angegeben!");
						return;
					}
					input.mountpoint = String.valueOf(inputMountPoint);
				} else {
					input.mountpoint = PRINTER_MARKER;
				}

				// if a password is set, warn the user about its unsafe storage
				// which we might want to implement one day...
				if (input.password != null && !input.password.isEmpty()) {
					if (!Gui.showMessageBox(
							"Das eingebene Passwort wird im Klartext gespeichert "
									+ "und ist in der VM für jeden Nutzer sichtbar.\n"
									+ "Verwenden Sie auf keinen Fall sicherheitskritische Passwörter!"
									+ "\n\nMöchten Sie diesen Netzlaufwerk trotzdem hinzufügen?",
							MessageType.QUESTION_YESNO, LOGGER, null)) {
						return;
					}
				}

				Wrapper<NetShare> newEntry = new Wrapper<NetShare>(input, false);
				Wrapper<NetShare> oldEntry = tblNetshare.getSelectedItem();
				List<Wrapper<NetShare>> oldList = new ArrayList<>(tblNetshare.getData());

				// now decide whether to create a new entry or update existing one
				if (oldEntry != null && oldList.contains(oldEntry)) {
					// editing existing one, delete it from the internal data
					if (!oldList.remove(oldEntry)) {
						lblError.setText("Änderung fehlgeschlagen!");
						LOGGER.error("Failed to remove selected share for replacement: " + oldEntry);
						return;
					}
				}

				// either we deleted the existing share from the data or we are
				// creating a new one, either way add it to the list and update
				// the table, if its not present already
				if (oldList.contains(newEntry)) {
					lblError.setText("Existiert bereits!");
					LOGGER.error("Network share already in the list, aborting.");
					return;
				}

				lblError.setText(null);
				oldList.add(newEntry);
				tblNetshare.setData(oldList, false);
				clearInputFields();
			}
		});

		btnDel.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				// try to delete the selected share
				Wrapper<NetShare> selection = tblNetshare.getSelectedItem();
				if (selection == null) {
					return;
				}
				List<Wrapper<NetShare>> oldList = new ArrayList<>(tblNetshare.getData());
				try {
					if (!oldList.remove(selection)) {
						// false if it was not found
						LOGGER.error("Could not remove non-existant network share '" + selection.toString()
								+ "' from the table data: " + oldList.toString());
						return;
					}
					// refresh table data
					tblNetshare.setData(oldList, true);
				} catch (Exception ex) {
					LOGGER.debug("Failed to remove " + selection.toString() + " from the table data.", ex);
					return;
				}
			}
		});

		chkShowPass.addItemListener(new ItemListener() {
			public void itemStateChanged(ItemEvent e) {
				if (e.getStateChange() != ItemEvent.SELECTED) {
					tfPassword.setEchoChar('*');
				} else {
					tfPassword.setEchoChar((char) 0);
				}
			}
		});
		clearInputFields();
	}

	private void clearInputFields() {
		btnDel.setEnabled(false);
		tfSharePath.setText(null);
		tfShareName.setText(null);
		tfUsername.setText(null);
		tfPassword.setText(null);
		cboNetshareAuth.setSelectedItem(null);
		cboNetshareMountPoint.setSelectedItem(null);
		chkIsPrinter.setSelected(false);
		chkShowPass.setSelected(false);
		btnAdd.setText("Hinzufügen");
	}

	public List<NetShare> getState() {
		List<Wrapper<NetShare>> list = tblNetshare.getData();
		if (list == null)
			return new ArrayList<>(0);
		List<NetShare> ret = new ArrayList<>();
		for (Wrapper<NetShare> item : list) {
			if (item.isChecked() || item.item.shareId == 0) {
				ret.add(item.item);
			}
		}
		return ret;
	}

	public boolean setState(List<NetShare> data, List<Integer> predefSelected) {
		if (data == null)
			return false;
		List<NetShare> shareList = new ArrayList<>(data);
		List<NetShare> predef = MetaDataCache.getPredefinedNetshares();
		Set<NetShare> checked = new HashSet<>();
		for (NetShare share : predef) {
			shareList.add(share);
			if (predefSelected != null && predefSelected.contains(share.shareId)) {
				checked.add(share);
			}
		}
		tblNetshare.setData(shareList, checked, false);
		return true;
	}

	public void addTableModelListener(TableModelListener listener) {
		tblNetshare.getModel().addTableModelListener(listener);
	}

	public void addToChangeMonitor(DialogChangeMonitor changeMonitor) {
		changeMonitor.add(tblNetshare);
	}
}

/**
 * Internal layout class for this widget
 */
class NetshareConfiguratorLayout extends JPanel {

	private static final long serialVersionUID = 6479525981542743622L;

	private final static String txtNetshareDesc = "<html>Hier können Sie Netzlaufwerke angeben,"
			+ " die automatisch beim Start der Veranstaltung eingebunden werden sollen."
			+ " Der Platzhalter <em>%loginuser%</em> wird im Pfad durch den Loginnamen des Nutzers ersetzt.</html>";

	protected final JLabel lblError;
	protected final NetshareTable tblNetshare = new NetshareTable();
	protected final JTextField tfSharePath, tfShareName, tfUsername;
	protected final JPasswordField tfPassword;
	protected final JButton btnAdd, btnDel;
	protected final JCheckBox chkIsPrinter;
	protected final JCheckBox chkShowPass;
	protected final ComboBox<NetShareAuth> cboNetshareAuth = new ComboBox<>(
			new ComboBoxRenderer<NetShareAuth>() {
				@Override
				public String renderItem(NetShareAuth item) {
					if (item == null)
						return null;
					return FormatHelper.netShareAuthName(item);
				}
			});
	protected final ComboBox<Character> cboNetshareMountPoint = new ComboBox<>(
			new ComboBoxRenderer<Character>() {
				@Override
				public String renderItem(Character letter) {
					if (letter == null)
						return null;
					return letter.equals(NetshareConfigurator.EMPTY_MARKER) ? letter.toString()
							: letter.toString() + ":";
				}
			});

	public NetshareConfiguratorLayout() {
		GridManager grid = new GridManager(this, 3, true, new Insets(3, 3, 3, 3));
		// top info panel
		grid.add(new JLabel(txtNetshareDesc), 3).fill(true, false).expand(true, false);
		grid.nextRow();
		// middle netshare list
		grid.add(new QScrollPane(tblNetshare), 3).fill(true, true).expand(true, true);
		grid.nextRow();

		JPanel pnlNewShare = new JPanel();
		GridManager gridNewShare = new GridManager(pnlNewShare, 6, true, new Insets(0, 3, 0, 3));
		pnlNewShare.setBorder(BorderFactory.createTitledBorder("Eigenes Netzlaufwerk definieren"));

		JPanel pnlSharePath = new JPanel();
		pnlSharePath.setLayout(new BoxLayout(pnlSharePath, BoxLayout.LINE_AXIS));
		gridNewShare.add(new QLabel("Pfad"));

		tfSharePath = new JTextField();
		pnlSharePath.add(tfSharePath);
		pnlSharePath.add(Box.createGlue());
		pnlSharePath.add(Box.createHorizontalStrut(5));
		chkIsPrinter = new JCheckBox("Drucker");
		pnlSharePath.add(chkIsPrinter);
		pnlSharePath.add(Box.createHorizontalStrut(5));
		gridNewShare.add(pnlSharePath, 5).fill(true, false).expand(true, false);
		gridNewShare.nextRow();
		// bottom form to add a new share
		tfShareName = new JTextField();
		// extra panel for fancy layout purposes...
		JPanel pnlShareName = new JPanel();
		pnlShareName.setLayout(new BoxLayout(pnlShareName, BoxLayout.LINE_AXIS));
		pnlShareName.add(tfShareName);
		pnlShareName.add(Box.createHorizontalStrut(3));
		pnlShareName.add(new QLabel("Laufwerk"));
		pnlShareName.add(Box.createHorizontalStrut(3));
		pnlShareName.add(cboNetshareMountPoint);
		gridNewShare.add(new QLabel("Anzeigename"));
		gridNewShare.add(pnlShareName, 5).fill(true, false).expand(true, false);
		gridNewShare.nextRow();
		gridNewShare.add(new QLabel("Authentifizierung"));
		gridNewShare.add(cboNetshareAuth, 5).fill(true, false).expand(true, false);
		gridNewShare.nextRow();
		gridNewShare.add(new QLabel("Username"));
		tfUsername = new JTextField(20);
		gridNewShare.add(tfUsername, 2).fill(true, false).expand(true, false);
		gridNewShare.add(new QLabel("Passwort"));
		tfPassword = new JPasswordField(20);
		gridNewShare.add(tfPassword, 2).fill(true, false).expand(true, false);
		gridNewShare.nextRow();
		chkShowPass = new JCheckBox("Passwort anzeigen");
		gridNewShare.add(Box.createGlue(), 5);
		gridNewShare.add(chkShowPass).anchor(GridBagConstraints.EAST);
		gridNewShare.nextRow();
		grid.add(pnlNewShare, 3).fill(true, false).expand(true, false);
		grid.nextRow();
		btnAdd = new JButton("Hinzufügen");
		btnDel = new JButton("Entfernen");
		lblError = new QLabel("");
		lblError.setForeground(Color.RED);
		grid.add(lblError).fill(true, false).expand(true, false);
		grid.add(btnAdd).anchor(GridBagConstraints.EAST);
		grid.add(btnDel).anchor(GridBagConstraints.EAST);
		grid.finish(false);
	}
}