package tim.prune.function;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

import tim.prune.App;
import tim.prune.GenericFunction;
import tim.prune.I18nManager;
import tim.prune.config.Config;
import tim.prune.data.Altitude;
import tim.prune.data.DataPoint;
import tim.prune.data.Field;
import tim.prune.data.Latitude;
import tim.prune.data.Longitude;
import tim.prune.data.Unit;
import tim.prune.data.UnitSetLibrary;
import tim.prune.gui.GuiGridLayout;

/**
 * Class to provide the function to paste coordinates
 * - see wikipedia, opencaching.de, waymarking.com etc
 */
public class PasteCoordinates extends GenericFunction
{
	private JDialog _dialog = null;
	private JTextField _nameField = null;
	private JTextField _coordField = null;
	private JButton _okButton = null;
	private JComboBox<String> _altUnitsDropDown;


	/**
	 * Constructor
	 * @param inApp application object for callback
	 */
	public PasteCoordinates(App inApp)
	{
		super(inApp);
	}

	/** Get the name key */
	public String getNameKey() {
		return "function.pastecoordinates";
	}

	/**
	 * Begin the function
	 */
	public void begin()
	{
		// Make dialog window
		if (_dialog == null)
		{
			_dialog = new JDialog(_parentFrame, I18nManager.getText(getNameKey()), true);
			_dialog.setLocationRelativeTo(_parentFrame);
			_dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
			_dialog.getContentPane().add(makeDialogComponents());
			_dialog.pack();
		}
		// MAYBE: Paste clipboard into the edit field
		_coordField.setText("");
		_nameField.setText("");
		boolean useMetres = (Config.getUnitSet().getAltitudeUnit() == UnitSetLibrary.UNITS_METRES);
		_altUnitsDropDown.setSelectedIndex(useMetres?0:1);
		enableOK();
		_dialog.setVisible(true);
	}


	/**
	 * Create dialog components
	 * @return Panel containing all gui elements in dialog
	 */
	private Component makeDialogComponents()
	{
		JPanel dialogPanel = new JPanel();
		dialogPanel.setLayout(new BorderLayout(0, 10));
		dialogPanel.add(new JLabel(I18nManager.getText("dialog.pastecoordinates.desc")), BorderLayout.NORTH);
		JPanel mainPanel = new JPanel();
		GuiGridLayout grid = new GuiGridLayout(mainPanel);
		_coordField = new JTextField("", 25);
		// Listeners to enable/disable ok button
		KeyAdapter keyListener = new KeyAdapter() {
			/** Key released */
			public void keyReleased(KeyEvent inE) {
				enableOK();
				if (inE.getKeyCode() == KeyEvent.VK_ESCAPE) {
					_dialog.dispose();
				}
			}
		};
		MouseAdapter mouseListener = new MouseAdapter() {
			public void mouseReleased(MouseEvent inE) {
				enableOK();
			};
		};
		_coordField.addKeyListener(keyListener);
		_coordField.addMouseListener(mouseListener);
		JLabel coordLabel = new JLabel(I18nManager.getText("dialog.pastecoordinates.coords"));
		coordLabel.setHorizontalAlignment(SwingConstants.RIGHT);
		grid.add(coordLabel);
		grid.add(_coordField);
		// Altitude format (if any)
		JLabel formatLabel = new JLabel(I18nManager.getText("dialog.openoptions.altitudeunits"));
		formatLabel.setHorizontalAlignment(SwingConstants.RIGHT);
		grid.add(formatLabel);
		final String[] altunits = {I18nManager.getText("units.metres"), I18nManager.getText("units.feet")};
		_altUnitsDropDown = new JComboBox<String>(altunits);
		grid.add(_altUnitsDropDown);
		// Waypoint name
		JLabel nameLabel = new JLabel(I18nManager.getText("dialog.pointnameedit.name"));
		nameLabel.setHorizontalAlignment(SwingConstants.RIGHT);
		grid.add(nameLabel);
		_nameField = new JTextField("", 12);
		grid.add(_nameField);
		dialogPanel.add(mainPanel, BorderLayout.CENTER);
		// button panel at bottom
		JPanel buttonPanel = new JPanel();
		buttonPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
		_okButton = new JButton(I18nManager.getText("button.ok"));
		ActionListener okListener = new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				if (_okButton.isEnabled()) {finish();}
			}
		};
		_okButton.addActionListener(okListener);
		_okButton.setEnabled(false);
		_coordField.addActionListener(okListener);
		_nameField.addActionListener(okListener);
		buttonPanel.add(_okButton);
		JButton cancelButton = new JButton(I18nManager.getText("button.cancel"));
		cancelButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				_dialog.dispose();
			}
		});
		buttonPanel.add(cancelButton);
		dialogPanel.add(buttonPanel, BorderLayout.SOUTH);
		dialogPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 15));
		return dialogPanel;
	}

	/**
	 * Enable or disable the OK button based on the contents of the text field
	 */
	private void enableOK()
	{
		String text = _coordField.getText();
		_okButton.setEnabled(text != null && text.length() > 6
			&& (text.indexOf(' ') >= 0 || text.indexOf(',') >= 0));
	}

	/**
	 * Finish the dialog when OK pressed
	 */
	private void finish()
	{
		DataPoint point = null;
		// Try to split using commas
		String[] items = _coordField.getText().split(",");
		if (items.length == 2) {
			point = parseValues(items[0].trim(), items[1].trim(), null);
		}
		else if (items.length == 3) {
			point = parseValues(items[0].trim(), items[1].trim(), items[2].trim());
		}
		else {
			// Splitting with commas didn't work, so try spaces
			items = _coordField.getText().split(" ");
			if (items.length == 2) {
				point = parseValues(items[0], items[1], null);
			}
			else if (items.length == 3 && items[1].length() == 1) {
				point = parseValues(items[0], items[2], null);
			}
			else if (items.length == 4) {
				point = parseValues(items[0] + " " + items[1],
					items[2] + " " + items[3], null);
			}
			else if (items.length == 6) {
				point = parseValues(items[0] + " " + items[1] + " " + items[2],
					items[3] + " " + items[4] + " " + items[5], null);
			}
			else if (items.length == 8) {
				point = parseValues(items[0] + " " + items[1] + " " + items[2] + " " + items[3],
					items[4] + " " + items[5] + " " + items[6] + " " + items[7], null);
			}
		}

		if (point == null) {
			JOptionPane.showMessageDialog(_parentFrame,
				I18nManager.getText("dialog.pastecoordinates.nothingfound"),
				I18nManager.getText(getNameKey()), JOptionPane.ERROR_MESSAGE);
		}
		else {
			// See if name was entered
			String name = _nameField.getText();
			if (name != null && name.length() > 0) {
				point.setFieldValue(Field.WAYPT_NAME, name, false);
			}
			// Pass information back to App to complete function
			_app.createPoint(point);
			_dialog.dispose();
		}
	}


	/**
	 * Try to parse the three given Strings into lat, lon and alt
	 * @param inValue1 first value (either lat/lon)
	 * @param inValue2 second value (either lon/lat)
	 * @param inValue3 altitude value or null if absent
	 * @return DataPoint object or null if failed
	 */
	private DataPoint parseValues(String inValue1, String inValue2, String inValue3)
	{
		// Check for parseable altitude
		Altitude alt = null;
		if (inValue3 != null)
		{
			// Look at altitude units dropdown
			final Unit altUnit = (_altUnitsDropDown.getSelectedIndex()==0?
				UnitSetLibrary.UNITS_METRES : UnitSetLibrary.UNITS_FEET);
			alt = new Altitude(inValue3, altUnit);
			if (!alt.isValid()) {alt = null;}
		}
		// See if value1 can be lat and value2 lon:
		Latitude coord1 = new Latitude(inValue1);
		Longitude coord2 = new Longitude(inValue2);
		if (coord1.isValid() && !coord1.getCardinalGuessed()
			&& coord2.isValid() && !coord2.getCardinalGuessed())
		{
			return new DataPoint(coord1, coord2, alt);
		}
		// Now see if lat/lon are reversed
		Longitude coord3 = new Longitude(inValue1);
		Latitude coord4 = new Latitude(inValue2);
		if (coord3.isValid() && !coord3.getCardinalGuessed()
			&& coord4.isValid() && !coord4.getCardinalGuessed())
		{
			// reversed order
			return new DataPoint(coord4, coord3, alt);
		}
		// Didn't work without guessing cardinals, so accept latitude, longitude order (if valid)
		if (coord1.isValid() && coord2.isValid()) {
			return new DataPoint(coord1, coord2, alt);
		}
		// Or accept other order (if valid)
		if (coord3.isValid() && coord4.isValid()) {
			// reversed order
			return new DataPoint(coord4, coord3, alt);
		}
		// Couldn't be parsed either way
		return null;
	}
}