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package program5;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
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.CommissionBasedEmployee;
import program5.HourlyEmployee;
import program5.SalariedEmployee;
import program5.Name;

public class makeGUI extends JFrame 
{
	// make GUI
	// Declare JFrame components to be used on GUI
	JButton btnReadFile, btnShowEmployee, btnSort;
	
	// Declare output area
	JTextArea jtaDisplay;
	
	// Declare a class variables to be used count for array
	private static Employee [] employeeArray = new Employee [1000];
	
	//Declare an array of Course objects to manage up to 100 Courses
	private static int count = 0;
	
	public makeGUI () {
		super("Employee");
		
		// Construct a label for instructions to the user
		JLabel lblInstructions = new JLabel("Click on READ FILE to get Employee information,\n then click on SHOW EMPLOYEE");
		
		// Construct button objects
		btnReadFile = new JButton("READ FILE");
		btnShowEmployee = new JButton ("SHOW EMPLOYEE");
		btnSort = new JButton ("SORT BY LAST NAME");
		
		// Construct a scrollable JTextArea
		JTextArea jtaDisplay = new JTextArea(10,30);
	    JScrollPane scrollPane = new JScrollPane(jtaDisplay);
	    
	    // Make the text area uneditable
	    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 on SHOW EMPLOYEE");
	                }// End actionPerformed
	            } // End ActionListener
	        ); // End addActionListener
		
		btnShowEmployee.addActionListener(
	            new ActionListener() {
	                public void actionPerformed(ActionEvent e) {
	                    // display formatted contacts in text area on GUI
	                	jtaDisplay.setText("Employee:");
	                	lblInstructions.setText("Use Scroll Bars for more employees");
	                	
	                	for (int i = 0; i < count; i++)
	                	{
	                		jtaDisplay.append("\n\n" + employeeArray[i].toString());
	                	} // End for
	                } // End actionPerformed
	            } // End ActionListener
	        ); // End addActionListener
		
		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("Employees Sorted by Last Name: ");
	                	for (int i = 0; i < count; i++)
	                	{
	                		jtaDisplay.append("\n\n" + employeeArray[i]);
	                	} // End for
	                } // End actionPerformed
	            } // End ActionListener
	        ); // End addActionListener
		
		// Add instructions label to the instructions panel
		pnlInstructions.add(lblInstructions);
		
		// Add button components to the button panel
		pnlButtons.add(btnReadFile);
		pnlButtons.add(btnShowEmployee);
		pnlButtons.add(btnSort);
		
		// 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(550,300);
		
		// Center JFrame
		setLocationRelativeTo(null);
		
		// Make the JFrame Visible
		setVisible(true);
	}// end constructor makeGUI
	public static void readFile() 
	{	
		// Declare a Scanner object for input
				Scanner scannerLine = null;
						
				//try		
				try 
				{
					Scanner input = new Scanner (new File ("payroll.txt"));
					// loop while there are more tokens in the text file
					while (input.hasNext())
					{
						String stringLine = input.nextLine();
						scannerLine = new Scanner (stringLine);
						scannerLine.useDelimiter(" ");
						String code = scannerLine.next();
						if (code.equals("C")) {
							employeeArray[count] = new CommissionBasedEmployee
												(	scannerLine.next(),				// reads first name
													scannerLine.next(),				// reads middle name
													scannerLine.next(),				// reads last name
													scannerLine.next(),				// reads title
													scannerLine.nextDouble(),		// reads commission rate
													scannerLine.nextDouble());		// reads sales
						}// end if
						
						else if (code.equals("H")) {
							employeeArray[count] = new HourlyEmployee
												(	scannerLine.next(),				// reads first name
													scannerLine.next(),				// reads middle name
													scannerLine.next(),				// reads last name
													scannerLine.next(),				// reads title
													scannerLine.nextDouble(),		// reads wage
													scannerLine.nextDouble());		// reads hours
						}// end else if
						
						else if (code.equals("S")) {
							employeeArray[count] = new SalariedEmployee
												(	scannerLine.next(),				// reads first name
													scannerLine.next(),				// reads middle name
													scannerLine.next(),				// reads last name
													scannerLine.next(),				// reads title
													scannerLine.nextDouble());		// reads salary
							
						}// end else if
						else
						{
							JOptionPane.showMessageDialog(null, "Invalid code in file - program ends");
							System.exit(0);
							
						}// end else
						count ++;	
						
						} // End while
					} // End try block
				catch (IOException ioe)
				{
					// Provide message in case file is not found
					JOptionPane.showMessageDialog(null, "File not found");
				} // End catch
				finally
				{
					// close input
					scannerLine.close();
				} // End finally
		
	}// end readFile
	public static void sortByLastName() 
	{
		// One by one move boundary of unsorted subarray
	     for (int i = 0; i < count-1; i++)
	     {
	         // Find the minimum element in unsorted array
	         int min_idx = i;
	         for (int j = i+1; j < count; j++)
	         {
	 	 		String temp = "";
	             if (employeeArray[j].getEmployeeName().compareTo(employeeArray[min_idx].getEmployeeName()) < 0)
	             {
	                 min_idx = j;
	             }// End if
	         }// End inner for
	         // Swap the found minimum element with the first
	         // element
	         Employee temp = employeeArray[min_idx];
	         employeeArray[min_idx] = employeeArray[i];
	         employeeArray[i] = temp;
	     }// End outer for
		
	}// end sortByLastName
	public static void main(String[] args) {
		// Construct JFrame for GUI
		new makeGUI(); 
	}// End main.
			
}// end class