/**
 * @(#)StudentTest.java
 *
 *
 * @author
 * @version 1.00 2016/4/27
 */

import java.util.Scanner;
import java.util.Date;
import java.io.*;
public class StudentTest {

	static Scanner input = new Scanner(System.in);
	static int sub = 0;
    public static void main(String args[]) {

    	//declare variables
    	int ID,Course_Number,userID,choice = 0,numrecords,menu = 0,mchoice = 0,changeap = 0,NewCourseID,changest = 0,NewStudentID;
    	String Name,Course_Name,Address,mstudent,Date_Of_Birth="",NewCourseName = "",NewStudentName = "",strID,strCourse_Number,struserID,strchoice,strnumrecords,strmenu,strmchoice,strchangeap,strnewcourseID,strchangest,strnewstudentID;

    	char check1,check2;
    	boolean MatureFlag = false;

		//Welcome the user to the program
		System.out.println("\t\t\t Welcome to the college application app.");
		//Prompt the user to enter the number of students, he wishes to add to the array
    	System.out.print("\t Enter the number of students:");
    	strnumrecords = input.next();
    	//validate the entered data.
    	numrecords = validate(strnumrecords,4);
    	//Create new student and application.
    	Student s1[] = new Student[numrecords];
    	Application a1[] = new Application[numrecords];

		//For loop, To make the user input data the X amount of times, X being the amount of students he entered.
    	for(int i = 0;i<numrecords;i++){

			//Prompt the user for the information
			input.nextLine();
    		System.out.print("\t Enter the Applicants Name : ");
    		Name = input.nextLine();
    		System.out.print("\t Enter the Applicants ID : ");
    		strID = input.nextLine();
    		ID = validate(strID,2);
    		System.out.print("\t Enter the Course Name: ");
    		Course_Name = input.nextLine();
    		System.out.print("\t Enter the Course Number : ");
    		strCourse_Number = input.nextLine();
    		Course_Number = validate(strCourse_Number,4);
    		System.out.print("\t Enter the Student Address : ");
    		Address = input.nextLine();

    		//create application
    		a1[i] = new Application(Course_Number,Course_Name);
    		System.out.print("\t Is this a Mature Student ? Y/N :");
    		mstudent = input.next();
    		mstudent = mstudent.toUpperCase();
    		System.out.println("\t Option Chosen = " + mstudent);

			//While loop, validation for mature student Y/N
    		while(!mstudent.matches("Y") && (!mstudent.matches("N"))){
    			System.out.println("\t\tError, Enter Y or N Please");
    			System.out.print("\tEnter Y/N For Mature Student : ");
				mstudent = input.next();
				mstudent = mstudent.toUpperCase();
    		}//End while Loop

    		//reset MatureFlag
    		MatureFlag = false;

    		//If the matrueFlag is Yes, Then Make the user enter Date_Of_Birth
    		if(mstudent.matches("Y")){
    			while(MatureFlag == false){
    				System.out.print("\tEnter date of birth dd/mm/yyyy : ");
    				Date_Of_Birth = input.next();
    				//if character input > 10, Then make him re-enter it.
    				if (Date_Of_Birth.length()!=10){
    				System.out.println("\tError, Incorrect Input\n\nPlease enter dd/mm/yyyy");
    				}
    				// If the character input = 10, Then make sure the 2'nd and 5'th characters are "/"
    				else{
	    				check1 = Date_Of_Birth.charAt(2);
	    				check2 = Date_Of_Birth.charAt(5);
	    				//If the 2'nd and 5'th characters are "/" then, Change the MatureFlag to true and tell the user the information has been entered correctly
	    				if ((check1=='/') && (check2 =='/')){
	    					System.out.println("\t Date of Birth has been entered Correctly");
	    					MatureFlag = true;
	    				}
	    				//If the 2'nd and 5'th characters are not "/", but it is 10 characters, make the user re-input the data.
	    				else{
	    					System.out.println("\tError, Incorrect Input\n\nPlease enter dd/mm/yyyy");
	    				}
	    			}//end else
    				}//end while
				//Create Mature Student
    			s1[i] = new MatureStudent(Name,ID,Address,a1[i],Date_Of_Birth);
    		}//end if
    		else{
    			//Create Student
    			s1[i] = new Student(Name,ID,Address,a1[i]);
    		}//end if
		}//end forloop of inputting data

		//Reset Choice
    	choice =0;

    	//While loop, keeps going until the user chooses to quit.
		while (choice !=3){
    		//Prompt the user for his choice
			System.out.println("");
    		System.out.println("\t\t\t Please, Select an option: ");
    		System.out.println("\t 1]View Course Details");
    		System.out.println("\t 2]Edit Course/Personal Details");
    		System.out.println("\t 3]Quit");
    		//Validate the next Input
			strchoice = input.next();
			choice = validate(strchoice,1);

			//User has chosen to View Course Info, Prompt him for ID
			if(choice == 1){
				System.out.print("Which Applicant's Course Info, Do you wish to see?");
				System.out.print("Enter that student's ID");
				struserID = input.next();
				userID = validate(struserID,2);
    			for(int i = 0;i<s1.length;i++){
    				//If user prompt matches ID
    				if(userID == s1[i].getID()){
    					//Change matureFlag
	    				MatureFlag = true;
	    				System.out.println("ID Found");
	    				//Hold onto the position the array is on.
	    				sub = i;
	    				break;
    				}//end if
    				}//end for
    				//If flag = False, then ID not found
    			if (MatureFlag == false){
    				System.out.println("\t ID entered, Does not match ID.");
    				System.out.println("\t The program will now shut down.");
    				System.exit(0);
    			}//end if
    			//If mature flag = true, then ID does match, and you can print the details.
    			else{
    				System.out.print(s1[sub].toString());
    				}//end else
			}//end if choice 1

			//If user chose to Edit Personal/
			else if(choice==2){
				//promt the user to enter ID
				System.out.print("Enter Applicants  ID to Display : ");
				struserID = input.nextLine();
				userID = validate(struserID,2);

    			//if useID and ID- match print users details outside the loop
    			for(int i = 0;i<s1.length;i++){
    				if(userID == s1[i].getID()){
    					//change the value of the MatureFlag
	    				MatureFlag = true;
	    				System.out.println("ID Found");
	    				//hold onto i, this is where the users details are stored in the array
	    				sub = i;
	    				//break out of the loop
	    				break;

    				}//end if userID == ID[i]
    			}//end for
    			//If id's do not match, then exit the program
    			if (MatureFlag == false){
    				System.out.println("\n---ID Number Doesnt Match, Goodbye---\n");
    				System.exit(0);
    			}//end if

	    		else{
					while(menu != 5){
    					//Show the menu, and Prompt the user for input
    					System.out.println("");
    					System.out.println("\t\t\t Please, Select an option: ");
    					System.out.println("\t 1]View Application Details");
    					System.out.println("\t 2]View Personal Details");
    					System.out.println("\t 3]Change Application Details");
    					System.out.println("\t 4]Change Personal Details");
    					System.out.println("\t 5]Quit");
						strmchoice = input.nextLine();

						mchoice = validate(strmchoice,3);

						if(mchoice == 1){
							System.out.print(a1[sub].toString());
						}//end choice = 1
						else if(mchoice == 2){
							System.out.print(s1[sub].getInfo());
						}//end choice = 2
						else if(mchoice == 3){
							System.out.print("Enter 1 to Change Course Or 2 to Change Course ID : ");
							strchangeap = input.nextLine();
							changeap = validate(strchangeap,5);
							if(changeap == 1){
								System.out.print("Enter Course Name :");
								NewCourseName = input.nextLine();
								a1[sub].setCourse_Name(NewCourseName);
							}//end if
							if(changeap == 2){
								System.out.print("Enter Course ID : ");
								strnewcourseID = input.nextLine();
								NewCourseID = validate(strnewcourseID,4);
								a1[sub].setCourse_Number(NewCourseID);
							}//end if
						}//end choice = 3

						else if(mchoice == 4){
							System.out.print("Enter 1 to Change Student Name Or 2 to Change Student ID : ");
							strchangest = input.nextLine();
							changest = validate(strchangest,5);
							if(changest == 1){
								System.out.print("Enter Course Name :");
								NewStudentName = input.nextLine();
								s1[sub].setName(NewStudentName);
							}//end if
							if(changest == 2){
								System.out.print("Enter Student ID : ");
								strnewstudentID = input.nextLine();
								NewStudentID = validate(strnewstudentID,2);
								s1[sub].setID(NewStudentID);
							}//end if
						}//end choice = 4
						else{
							break;
						}//end if
    				}//end while
    			}//end else
    		}//end choice

    			else{
    				//Write all info to a file
					BufferedWriter Information = null;
					String loc1 = "Info.doc";

					try{
						Information = new BufferedWriter (new FileWriter(loc1,true));
						}catch(Exception e){
						System.out.println("Cannot save to file");
					}

					//not Names.length, it will be collegeStudents (or the Name of your student array)
	  	  			for (int i = 0;i<s1.length;i++){
		  	 			try{
							Information.newLine();
							Information.write(s1[i].toString());
							//not Names.length, it will be collegeStudents (or the Name of your student array)
							if(i==s1.length-1){
								Information.newLine();
								Information.close();
								Date d = new Date();
								System.out.println("\nFile Updated on " + d.toString() + "\n");
							}//end if

						}//end try
						catch(Exception ex){
							System.out.println("Could not access file");
						}//end catch
					}//end for
					//End of writing to a file
					//System.out.println("\nFile updated\n");
					System.out.println("Thank you for using the program\n\n");
					System.exit(0);
    			}//end if
		}//end while

    }//end main method

	public static int validate(String x,int y){
    	if(y==1){
    		while(!x.matches("[1-3]")){
    			java.awt.Toolkit.getDefaultToolkit().beep();
    			System.out.println("Error,Digits Between 1 to 3 Only");
    			System.out.print("\nSelect An Option\n1) View Course/Personal Details\n2) Edit Course/Personal Details\n3)Exit\n>");
    			x = input.nextLine();
    		}//end while for validate loginmenu
    		return Integer.parseInt(x);
		}//end if y==1

    	else if(y==2){
			while(!x.matches("\\d{3}")){
				java.awt.Toolkit.getDefaultToolkit().beep();
				System.out.print("Error, 3 digits only\n\nEnter ID : ");
				x = input.nextLine();
			}//end while
			return Integer.parseInt(x);
    	}//end if y==2

    	else if(y==3){
    		while(!x.matches("[1-5]")){
    			java.awt.Toolkit.getDefaultToolkit().beep();
    			System.out.println("\n_-_-_Error, Numbers 1-5 Only_-_-_\n");
    			System.out.print("\nSelect An Option\n1) View Application Details\n2) View Personal Details\n3) Change Application Details\n4) Change Personal Details\n5) Exit\n>");
    			x = input.nextLine();
    		}//end while
    		return Integer.parseInt(x);
    	}//end if y==3

    	else if(y==4){
    		while(!x.matches("\\d+")){
    			java.awt.Toolkit.getDefaultToolkit().beep();
    			System.out.println("Error,Digits Only");
    			System.out.print("\n*******Enter Number of Students*******\n>");
				x = input.nextLine();
    		}//end while
    		return Integer.parseInt(x);
    	}//end if==4

    	else if(y==5){
    			while(!x.matches("[1-2]")){
    			java.awt.Toolkit.getDefaultToolkit().beep();
    			System.out.println("Error,Digits Between 1 to 2 Only");
    			System.out.print("Enter 1 to Change Course Or 2 to Change Course ID : ");
    			x = input.nextLine();
    		}//end while for validate loginmenu
    		return Integer.parseInt(x);
    	}
    	return Integer.parseInt(x);

    }//end validate method
}//end class