package net.cbaines.suca;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.StringReader;

import javax.security.auth.login.LoginException;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import net.fortuna.ical4j.data.CalendarBuilder;
import net.fortuna.ical4j.data.ParserException;
import net.fortuna.ical4j.model.Calendar;

@SuppressWarnings("serial")
public class CalendarApplet extends JApplet {

	private String calendarCSVString = null;
	private String calendarICALString = null;

	private JTabbedPane stageTabbedPane;

	// The panel used for the file fetch stuff
	private JPanel csvFileFetchPanel;

	private JLabel csvFileFetchInstructions;

	private JTextField usernameTextField;
	private JPasswordField passwordTextField;
	private JButton go;

	private JProgressBar fetchProgress;

	private JButton csvFileSelectorButton;

	private JTextArea csvTextArea;

	private CalendarApplet instance;

	// Panel for the stage controls

	private JPanel controlsPanel;

	// Panel for the calendar creation

	private JPanel calendarCreationPanel;

	private JPanel calendarCreationOptions;

	// This is more of a development feature....?
	private JTextArea calendarPreviewTextArea;

	public void init() {
		// Execute a job on the event-dispatching thread:
		// creating this applet's GUI.
		try {
			javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
				public void run() {
					createGUI();
				}
			});
		} catch (Exception e) {
			System.err.println("createGUI didn't successfully complete");
		}
	}

	void createGUI() {
		try {

			stageTabbedPane = new JTabbedPane();

			// Create the first screen

			csvFileFetchPanel = new JPanel(new GridLayout(1, 2));

			JTabbedPane csvFileFetchMethodsTabbedPane = new JTabbedPane();

			JPanel loginPanel = new JPanel();
			JLabel usernameLabel = new JLabel("Username");
			loginPanel.add(usernameLabel);
			usernameTextField = new JTextField(10);
			loginPanel.add(usernameTextField);

			JLabel passwordLabel = new JLabel("Password");
			loginPanel.add(passwordLabel);
			passwordTextField = new JPasswordField(10);
			loginPanel.add(passwordTextField);

			go = new JButton("Go");
			loginPanel.add(go);

			fetchProgress = new JProgressBar();
			fetchProgress.setIndeterminate(true);
			fetchProgress.setVisible(false);
			loginPanel.add(fetchProgress);

			csvFileFetchMethodsTabbedPane.addTab("Download", loginPanel);

			JPanel csvFileLoadPanel = new JPanel();

			csvFileSelectorButton = new JButton("Load csv file");
			csvFileLoadPanel.add(csvFileSelectorButton);

			csvFileFetchMethodsTabbedPane.addTab("Load", csvFileLoadPanel);
			csvFileFetchMethodsTabbedPane.setEnabledAt(1, false);

			csvFileFetchPanel.add(csvFileFetchMethodsTabbedPane);

			csvTextArea = new JTextArea(100, 100);
			csvFileFetchPanel.add(new JScrollPane(csvTextArea));

			go.addActionListener(new ActionListener() {
				@Override
				public void actionPerformed(ActionEvent arg0) {
					go.setEnabled(false);
					new FetchThread().start();
				}
			});

			stageTabbedPane.addTab("Calendar Fetch", csvFileFetchPanel);

			// Calendar creation panel
			calendarCreationPanel = new JPanel(new GridLayout(1, 2));

			calendarCreationOptions = new JPanel();

			JButton createCalendarButton = new JButton("Create Calendar");
			createCalendarButton.addActionListener(new ActionListener() {
				@Override
				public void actionPerformed(ActionEvent arg0) {

					SotonCalendarParser calParser = new SotonCalendarParser();

					CalendarBuilder builder = new CalendarBuilder(calParser);
					try {
						Calendar calendar = builder.build(new StringReader(calendarCSVString));
						calendarICALString = calendar.toString();
						calendarPreviewTextArea.setText(calendarICALString);
						System.out.println(calendarICALString);
					} catch (ParserException e) {
						e.printStackTrace();
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			});
			calendarCreationOptions.add(createCalendarButton);

			JButton saveCalendarButton = new JButton("Save Calendar");
			saveCalendarButton.addActionListener(new ActionListener() {
				@Override
				public void actionPerformed(ActionEvent arg0) {

					JFileChooser fc = new JFileChooser();
					int returnVal = fc.showSaveDialog(instance); // this = Applet
					if (returnVal == JFileChooser.APPROVE_OPTION) {
						File aFile = fc.getSelectedFile();

						try {
							BufferedWriter out = new BufferedWriter(new FileWriter(aFile));
							out.write(calendarICALString);
						} catch (IOException e) {
							e.printStackTrace();
						}

					}

				}
			});
			calendarCreationOptions.add(saveCalendarButton);

			calendarCreationPanel.add(calendarCreationOptions);

			calendarPreviewTextArea = new JTextArea();

			calendarCreationPanel.add(new JScrollPane(calendarPreviewTextArea));

			stageTabbedPane.addTab("Calendar Creation", calendarCreationPanel);

			controlsPanel = new JPanel();
			controlsPanel.add(new JButton("Previous"));
			controlsPanel.add(new JButton("Next"));

			getContentPane().add(stageTabbedPane, BorderLayout.CENTER);
			getContentPane().add(controlsPanel, BorderLayout.SOUTH);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private class FetchThread extends Thread {

		public FetchThread() {
			super();
		}

		@Override
		public void run() {
			System.out.println("Starting fetch thread");

			String csvString;
			try {
				fetchProgress.setVisible(true);

				csvString = new SotonCalendarFetcher(usernameTextField.getText(), String.valueOf(passwordTextField
						.getPassword())).fetchAndParseTimetable();

				System.out.println("Finished fetch");

				fetchProgress.setIndeterminate(false);
				fetchProgress.setValue(100);
				fetchProgress.setString("Finished");

				calendarCSVString = csvString;
				csvTextArea.setText(calendarCSVString);
				go.setEnabled(true);

				System.out.println("Finished fetch thread");

			} catch (LoginException e) {
				fetchProgress.setIndeterminate(false);
				fetchProgress.setValue(0);
				fetchProgress.setString("Login Error");
			}

		}
	}

}