import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Scanner;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import Program5.Employee;
import Program5.SalariedEmployee;
import Program5.CommissionBasedEmployee;
import Program5.HourlyEmployee;
import Program5.Name;

public class ProgramAssignment5 extends JFrame {


	// creates buttons for GUI
	JButton btnReadFile, btnShowEmployees, btnSort, btnSave, btnShow;

	// Display area
	JTextArea jtaDisplay;

	static int counter = 0;
	private static Employee[] employeeList = new Employee[100];

	public ProgramAssignment5() {
		// Call constructor of superclass
		super("Weekly Payroll");

		// Construct a label for instructions to the user
		JLabel lblInstructions = new JLabel(
				"Click on Read File to get Payroll information,\n before clicking on View Payroll");

		// Construct button objects
		btnReadFile = new JButton("Read File");
		btnShowEmployees = new JButton("View Payroll");
		btnSort = new JButton("Sort By Last Name");
		btnSave = new JButton("Save List");
		btnShow = new JButton("Show Saved List");

		// Construct a scrollbar JTextArea
		JTextArea jtaDisplay = new JTextArea(15, 50);
		JScrollPane scrollPane = new JScrollPane(jtaDisplay);


		jtaDisplay.setEditable(false);

		// Declare and construct panels for components
		JPanel pnlInstructions = new JPanel();
		JPanel pnlButtons = new JPanel();
		JPanel pnlDisplay = new JPanel();

		// Add event handlers to the buttons
		btnReadFile.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				// read file
				jtaDisplay.setText("Reading File");
				readFile();
				lblInstructions.setText("Click to view payroll");
			}// End
		});

		btnShowEmployees.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				// display formatted contacts in text area on GUI
				jtaDisplay.setText(displayList());
				lblInstructions.setText("Scroll to view all employees");

			}
		});

		btnSort.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				// sort by lastName using a bubble sort or another one if you wish
				sortByLastName();
				// Message shown after sort is complete
				jtaDisplay.setText("Payroll Sorted by Last Names");
			}
		});

		btnSave.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				// sort by lastName using a bubble sort or another one if you wish
				writeFile();
				// Message shown after sort is complete
				jtaDisplay.setText("List Saved to Binary File");
			}
		});

		btnShow.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				// sort by lastName using a bubble sort or another one if you wish
				// Message shown after sort is complete
				jtaDisplay.setText(fileDisplay());
			}
		});

		// Add instructions label to the instructions panel
		pnlInstructions.add(lblInstructions);

		// Add button components to the button panel
		pnlButtons.add(btnReadFile);
		pnlButtons.add(btnShowEmployees);
		pnlButtons.add(btnSort);
		pnlButtons.add(btnSave);
		pnlButtons.add(btnShow);

		// Add the scrollable text area to the display panel
		pnlDisplay.add(scrollPane);

		// Add the panels to the JFrame
		add(pnlInstructions, BorderLayout.NORTH);
		add(pnlButtons, BorderLayout.SOUTH);
		add(pnlDisplay, BorderLayout.CENTER);

		// Set the size of the JFrame
		setSize(750, 400);

		// Center JFrame
		setLocationRelativeTo(null);

		// Make the JFrame Visible
		setVisible(true);

		//
	}// End JFrame constructor


	public void readFile()
	{
		Scanner scanFile = null;

		try

		{
			scanFile = new Scanner(new File("payroll.txt"));
			while (scanFile.hasNext()) {
				String line = scanFile.nextLine();
				Scanner lineDivider = new Scanner(line);
				lineDivider.useDelimiter(" ");
				String code = lineDivider.next();

				if (code.equalsIgnoreCase("c"))

				{
					employeeList[counter] = new CommissionBasedEmployee(lineDivider.next(), // firstName
							lineDivider.next(), // middleName
							lineDivider.next(), // lastName
							lineDivider.next(), // namePrefix
							lineDivider.nextDouble(), // commission rate
							lineDivider.nextDouble()); // sales earned
					counter++;

				} // end commissioned branch

				else if (code.equalsIgnoreCase("s"))

				{

					employeeList[counter] = new SalariedEmployee(lineDivider.next(), // firstName
							lineDivider.next(), // middleName
							lineDivider.next(), // lastName
							lineDivider.next(), // namePrefix
							lineDivider.nextDouble()); // yearly salary
					counter++;

				} // end salaried branch

				else if (code.equalsIgnoreCase("h")) {
					employeeList[counter] = new HourlyEmployee(lineDivider.next(), // firstName
							lineDivider.next(), // middleName
							lineDivider.next(), // lastName
							lineDivider.next(), // namePrefix
							lineDivider.nextDouble(), // hourlyWage
							lineDivider.nextDouble()); // hoursWorked
					counter++;
				} // end hourly branch

				else {
					JOptionPane.showMessageDialog(null, "Error with file input found");
					break;
				}

			}

		}

		catch (IOException ioe)

		{

			JOptionPane.showMessageDialog(null, "Error cannot find file");

		}

		finally

		{

			scanFile.close();

		}
	} // end readFile ()


	public static void sortByLastName()

	{

		// One by one move boundary of unsorted subarray
		for (int i = 0; i < counter - 1; i++) {
			// Find the minimum element in unsorted array
			int min_idx = i;
			for (int j = i + 1; j < counter; j++)

			{

				if (employeeList[j].getLast().compareTo(employeeList[min_idx].getLast()) < 0)

				{

					min_idx = j;

				}
			}
			Employee temp = employeeList[min_idx];
			employeeList[min_idx] = employeeList[i];
			employeeList[i] = temp;

		}
	}// End sortByLastName()


	public void writeFile()

	{

		String fileName = "payroll.bin";

		try
		{

			ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream(fileName));
			os.writeObject(employeeList); // writes object
			os.close();

		}

		catch (FileNotFoundException e)
		{

			e.printStackTrace();

		}

		catch (IOException e)
		{

			e.printStackTrace();

		}
	} // end writeFile


	public String fileDisplay() {

		String outputString = "";

		try {

			ObjectInputStream is = new ObjectInputStream(new FileInputStream("payroll.bin"));

			Employee[] test = (Employee[]) is.readObject();
			for (int i = 0; i < counter; i++) {
				outputString += test[i] + "\n";
			} // end for loop

			is.close();
		} // end try

		catch (FileNotFoundException e)

		{

			e.printStackTrace();

		}

		catch (IOException e)

		{

			e.printStackTrace();

		}

		catch (ClassNotFoundException e)

		{

			e.printStackTrace();

		}

		return outputString;
	} // end displayFile()

	public String displayList()

	{

		String outputString = "";

		for (int i = 0; i < counter; i++)

		{

			outputString += employeeList[i] + " \n";

		}

		return outputString;

	}


	public static void main(String[] args)

	{

		new ProgramAssignment5();

	}// End main.

}// End class.