import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Scanner;

public class EmployeeApp
{
	static Scanner input = new Scanner(System.in);
    static InputStreamReader textInput = new InputStreamReader(System.in);
    static BufferedReader reader = new BufferedReader(textInput);

    static int centralEmployeeID = 105;
    static int centralDepartmentID = 1005;
    static ArrayList<Employee> allEmployee = new ArrayList<Employee>();
    static ArrayList<Department> allDepartments = new ArrayList<Department>();

    public static void main(String[] args)
    {
    	prePopulate();
    	mainMenu();
    }

    public static void prePopulate()
    {
        Department d1 = new Department(1001, "Sales");
        Department d2 = new Department(1002, "Production");
        Department d3 = new Department(1003, "Finance");
        Department d4 = new Department(1004, "Marketing");
        allDepartments.add(d1);
        allDepartments.add(d2);
        allDepartments.add(d3);
        allDepartments.add(d4);

        Employee e1 = new Employee(101, "Anton", 18, d1);
        Employee e2 = new Employee(102, "Dato", 17, d2);
        Employee e3 = new Employee(103, "Dyl", 19, d3);
        Employee e4 = new Employee(104, "Karl", 19, d4);

        d1.addEmployee(e1);
        d2.addEmployee(e2);
        d3.addEmployee(e3);
        d4.addEmployee(e4);

        allEmployee.add(e1);
        allEmployee.add(e2);
        allEmployee.add(e3);
        allEmployee.add(e4);
    }

    public static void mainMenu()
    {
    	System.out.println("Press 1 for the Employee Menu");
        System.out.println("Press 2 for the Department Menu");
        System.out.println("Press 3 to Exit");

        String choice = input.next();

        switch(choice)
        {
            case "1":
            {
                System.out.println("Loading Employee Menu...");
                employeeMenu();
                break;
            }
            case "2":
            {
                System.out.println("Loading Department Menu...");
                departmentMenu();
                break;
            }
            case"3":
            {
            	System.exit(0);
            	break;
            }

        }
        mainMenu();
    }



    public static void departmentMenu()
    {
    	System.out.println("Press 1 to Create a Department");
        System.out.println("Press 2 to View All Departments");
        System.out.println("Press 3 to Edit a Department");
        System.out.println("Press 4 to Delete a Department");
        System.out.println("Press 5 to Return to Main Menu");

        String choice = input.next();

        switch(choice)
        {
           case"1":
           {
        	   try {
                   createDepartment();
                   }
                   catch(Exception e)
                   {
                       System.out.println("Error was logged");
                   }
        	   break;
           }
           case"2":
           {
        	   viewDepartments();
        	   break;
           }
           case"3":
           {
        	   try {
                   editDepartment();
                   }
                   catch(Exception e)
                   {
                       System.out.println("Error was logged");
                   }
        	  break;
           }
           case"4":
           {
        	   deleteDepartment();
        	   break;
           }
           case"5":
           {
        	   mainMenu();
        	   break;
           }
        }
    }

    public static void employeeMenu()
    {
    	System.out.println("Press 1 to Create a Employee");
        System.out.println("Press 2 to View All Employees");
        System.out.println("Press 3 to Edit a Employee");
        System.out.println("Press 4 to Delete a Employee");
        System.out.println("Press 5 to view Employees by Department");
        System.out.println("Press 6 to Return to Main Menu");

        String choice = input.next();

        switch(choice)
        {
            case"1":
            {
            	try {
                    createEmployee();
                    }
                    catch(Exception e)
                    {
                        System.out.println("Error was logged");
                    }
            	break;
            }
            case"2":
            {
            	viewEmployees();
            	break;
            }
            case"3":
            {
            	try {
                    editEmployees();
                    }
                    catch(Exception e)
                    {
                        System.out.println("Error was logged");
                    }
            	break;
            }
            case"4":
            {
            	deleteEmployee();
            	break;
            }
            case"5":
            {
            	viewEmployeesByDepartment();
            	break;
            }
            case"6":
            {
            	mainMenu();
            	break;
            }
        }
    }

    public static void createDepartment() throws Exception
    {
    	Department d = new Department();
        d.setDepartmentID(centralDepartmentID);
        centralDepartmentID++;
        System.out.println("Enter Department Name");
        d.setDepartmentName(reader.readLine());
        allDepartments.add(d);
        System.out.println(d.getDepartmentName() + " has successfully been added");

        mainMenu();
    }

    public static void viewDepartments()
    {
    	for(Department d: allDepartments)
        {
            System.out.println(d.getDepartmentID() + "\t" + d.getDepartmentName());
        }
    	mainMenu();
    }

    public static void editDepartment() throws Exception
    {

        System.out.println("Please choose ID number of Department to edit");
        int chosenDepartment = input.nextInt();


        for(Department d: allDepartments)
        {
            if(chosenDepartment==d.getDepartmentID())
            {

                System.out.println("Enter Department Name");
                d.setDepartmentName(reader.readLine());

                System.out.println(d.getDepartmentName() + " has successfully been Edited");
            }
        }
        mainMenu();
    }

    public static void deleteDepartment()
    {
    	System.out.println("Please choose ID number of Department to Delete");
        int chosenDepartment = input.nextInt();

        for(Department d: allDepartments)
        {
        	if(chosenDepartment==d.getDepartmentID())
        	{
        		allDepartments.remove(d);
        		 System.out.println(d.getDepartmentName() + " has successfully been Deleted");

        		 mainMenu();
        	}

        }

    }

    public static void createEmployee() throws Exception
    {
    	Employee e = new Employee();
    	e.setEmployeeID(centralEmployeeID);
    	centralEmployeeID++;
    	System.out.println("Enter Employee Name");
    	e.setEmployeeName(reader.readLine());
    	System.out.println("Enter Employee Age");
    	e.setEmployeeAge(input.nextInt());
    	System.out.println("Enter Employee Department");


    	System.out.println("Enter Employee Department by using Department ID");
    	int chosenDepartmentID = input.nextInt();

    	for(Department d: allDepartments)
    	{
    		if(chosenDepartmentID == d.getDepartmentID())
    		{
    			e.setEmployeeDepartment(d);
    			d.addEmployee(e);
    			System.out.println(e.getEmployeeName() + " has applied for " + d.getDepartmentName());
    			allEmployee.add(e);
    		}

    	}
    	mainMenu();
    }

    public static void viewEmployees()
    {
    	for(Employee e: allEmployee)
        {
            System.out.println(e.getEmployeeID() + "\t" + e.getEmployeeName() + "\t" + e.getEmployeeAge() + "\t" + e.getEmployeeDepartment().getDepartmentName());
        }
    	mainMenu();
    }

    public static void editEmployees() throws Exception
    {
    	System.out.println("Please choose Employee by ID Number");
    	int chosenEmployee = input.nextInt();

    	for(Employee e: allEmployee)
        {
            if(chosenEmployee==e.getEmployeeID())
            {

                System.out.println("Enter Employee Name");
                e.setEmployeeName(reader.readLine());
                System.out.println("Enter Employee Age");
                e.setEmployeeAge(input.nextInt());
                System.out.println("Enter Employee Department");


            	System.out.println("Enter Employee Department by using Department ID");
            	int chosenDepartmentID = input.nextInt();

            	for(Department d: allDepartments)
            	{
            		if(chosenDepartmentID == d.getDepartmentID())
            		{
            			e.setEmployeeDepartment(d);
            			d.addEmployee(e);
            			System.out.println(e.getEmployeeName() + " has applied for " + d.getDepartmentName());
            			 System.out.println(e.getEmployeeName() + " has successfully been Edited");
            		}

                }
              }
        }
    	mainMenu();
    }

    public static void deleteEmployee()
    {
    	System.out.println("Please choose ID number of Employee to Delete");
        int chosenEmployee = input.nextInt();

        for(Employee e: allEmployee)
        {
        	if(chosenEmployee==e.getEmployeeID())
        	{
        		allEmployee.remove(e);
        		 System.out.println(e.getEmployeeName() + " has successfully been Deleted");

        		 mainMenu();
        	}

        }
    }

    	public static void viewEmployeesByDepartment()
    	{
    		System.out.println("Enter Department by ID number");
    		int chosenDepartmentID = input.nextInt();

    		for(Department d: allDepartments)
    		{


    			if(chosenDepartmentID == d.getDepartmentID())
    			{
    				d.printStaff();
    			}
    		}
    		mainMenu();
    	}

    	public static void admin()
    	{

    	}

}