/**
Name: Cameron Lewis
Student ID: 16254966
**/


// Payroll.java
//
// ICS H22 Fall 2005
// Lab 2: The Price You Pay
//
// This class should contain the majority of the code for your user interface.
// To help you get started, I've included a little bit of code:
//
//   * In the constructor, I've created three objects that you'll need in
//     various places: a Scanner to read input, a PayrollMenu (see
//     PayrollMenu.java for more information about that), and an
//     ArrayList<Employee> that you should use to store all of the employees.
//
// You should start by adding code to the go() method that displays the menu,
// asks the user for the next command, and processes that command.  (Be aware
// that the PayrollMenu object can do some of this work for you.  See the
// PayrollMenu.java file for more information before you proceed.)


import java.util.ArrayList;
import java.util.Scanner;
import java.util.InputMismatchException;
import java.io.FileReader;
import java.io.PrintWriter;
import java.io.FileNotFoundException;
import java.io.PrintWriter;


public class Payroll
{
	//used to look through the input file
	private Scanner scanner;

	//menu object used to access enumerated commands of PayrollCommand class taht are inputed by the user
	private PayrollMenu menu;

	//will be used to store the name of the input file specified in the main method of Company
	private String inputFileName;

	//object used to write to an output file
	private PrintWriter out;

	//used to store all the employee objects added to the database and can then be accessed to print employees and paychecks
	private Employee[] theList;

	//stores the size of theList
	private int size;

	//constant used to define size of theList
	public static final int DEFAULT = 100;

	//constant used to define the file output will be printed to
	public static final String OUTPUT = "output.txt";

	//constructs Payroll objects, assigns @param args to inputFileName
	//initializes menu, theList and size
	//creates an output file and establishes a scanner to read the input file
	public Payroll(String args)
	{
		inputFileName = args;
		menu = new PayrollMenu();
		theList = new Employee[DEFAULT];
		size = 0;

		try
		{
			scanner = new Scanner(new FileReader(inputFileName));
		}

		catch (FileNotFoundException e)
		{
			System.out.println("File not found...");
			System.exit(0);
		}

		try
		{
			out = new PrintWriter(OUTPUT);
		}
		catch (FileNotFoundException e)
		{
			System.out.println("File not found...");
			System.exit(0);
		}
	}

	//starts executing commands given to the program by the input file
	public void go()
	{
		String command = scanner.nextLine();

		if (command.compareToIgnoreCase("AddEmployee") == 0)
			addEmployee();
		else if (command.compareToIgnoreCase("RemoveEmployee") == 0)
			removeEmployee();
		else if (command.compareToIgnoreCase("ShowEmployees") == 0)
			showEmployees();
		else if (command.compareToIgnoreCase("doWeeklyPayroll") == 0)
			doWeeklyPayroll();
		else
		{
			System.out.println("Now exiting...");
			System.exit(0);
		}
	}

	//used to continue the program after a method is executed
	public void goAgain()
	{
		if (scanner.hasNext())
		{
			String command = scanner.next();
			if (command.compareToIgnoreCase("AddEmployee") == 0)
				addEmployee();
			else if (command.compareToIgnoreCase("RemoveEmployee") == 0)
				removeEmployee();
			else if (command.compareToIgnoreCase("ShowEmployees") == 0)
				showEmployees();
			else if (command.compareToIgnoreCase("doWeeklyPayroll") == 0)
				doWeeklyPayroll();
		}
		else
		{
			System.out.println();
			System.out.println("Program finished. Please examine " + OUTPUT + " to see the result of your inquiries. Now exiting...");
			System.out.println();
			out.close();
			System.exit(0);
		}
	}

	//returns true if the name is already in the list
	public boolean isThere(String name)
	{
		int i = 0;
		while ((i <= (size - 1)) && theList[i] != null)
		{
			if (name.compareToIgnoreCase(theList[i].getName()) == 0)
			{
				return true;
			}
			i++;
		}return false;
	}

	//returns true if theList is full
	public boolean isFull()
	{
		if (size() == DEFAULT)
		{
			out.println("The database is full.  Please remove an employee if you wish to add another.");
			out.close();
			return true;
		}
		else return false;
	}

	//returns class variable size
	public int size() {return size;}


	//adds an employee to the database
	public void addEmployee()
	{
		Employee emp;
		int i = 0;
		if (isFull())
		{
			out.println("The database is full so no employees can be added.");
			scanner.nextLine();
			scanner.nextLine();

			goAgain();
		}

		String name = scanner.next();
		name += (" " + scanner.next());

		if (isThere(name))
		{
			out.println("Employee " + name + " is already in the database.");
			scanner.nextLine();
			scanner.nextLine();

			goAgain();
		}

		String type = scanner.next();

		double fakeWage = scanner.nextDouble();
		int wage = (int) (fakeWage * 100);


		if (type.compareToIgnoreCase("hourly") == 0)
		{
			emp = new Hourly(name, wage);
			out.println("Employee " + name + ", an " + type + " employee making " + CurrencyFormat.format(wage) + "/hr has been successfully added.");
			out.println();
		}

		else if (type.compareToIgnoreCase("salaried") == 0)
		{
			emp = new Salaried(name, wage);
			out.println("Employee " + name + ", a " + type + " employee with an annual salary of " + CurrencyFormat.format(wage) + " has been successfully added.");
			out.println();
		}

		else
		{
			emp = new Contracted(name, wage);
			out.println("Employee " + name + ", a " + type + " employee making " + CurrencyFormat.format(wage) + "/hr has been successfully added.");
			out.println();
		}

		while (theList[i] != null)
		{
			i++;
		}

		theList[i] = emp;
		size++;


		goAgain();
	}

	//removes a specified employee from the database
	public void removeEmployee()
	{
		int i = 0;
		scanner.nextLine();
		String name = scanner.nextLine();

		while (i <= 99)
		{
			if (theList[0] == null)
			{
				out.println("No employees in the database to delete.");


				goAgain();
			}
			else if (isThere(name) == true)
			{
				theList[i] = theList[size - 1];
				theList[size - 1] = null;
				size--;
				out.println(name + " successfully removed.");
				out.println();
				goAgain();
			}
			else i++;
		}

		out.println("No employee named " + name + " found. Removal of " + name + " failed.");
		out.println();

		goAgain();
	}

	//prints a list of all the employees in the database
	public void showEmployees()
	{
		int i = 0;
		if (size == 0)
		{
			out.println("No employees in the database to show.");

			goAgain();
		}

		while (i <= 99 && theList[i] != null)
		{
			out.println(theList[i].toString());
			i++;
		}

		goAgain();
	}

	//calculates the weekly paycheck for each individual specified and then prints a paycheck for each employee
	public void doWeeklyPayroll()
	{
		int i, j, k = 0;
		String[] tName = new String[size];
		int[] tHours = new int[size];
		if (size == 0)
		{
			out.println("No employees in the database to construct a paycheck for.");

			goAgain();
		}

		for (i = 0; i <= (size - 1); i++)
		{
			scanner.nextLine();
			String name = scanner.nextLine();
			int hours = scanner.nextInt();
			tName[i] = name;
			tHours[i] = hours;
		}

		for (j = 0; j <= (size - 1); j++)
		{
			for (k = 0; k <= (size - 1); k++)
			{
				if (tName[j].compareToIgnoreCase(theList[k].getName()) == 0)
				{
					out.println(theList[k].createWeeklyPaycheck(tHours[j]).toString());
				}
			}
		}

		goAgain();
	}
}