static Scanner input = new Scanner(System.in); // Scanner object

static int ids[];

static String[] registeredCourses;

static String[] courseDetails;

static String[] availableCourse;

public static void admin() {

System.out.print("************************************************\n");

System.out.print("\t\tAdmin Panel\n");

System.out.print("************************************************\n\n");

// Looping the menu

while(true){

System.out.print("\n1. Student Details \n");

System.out.print("2. Course Details \n");

System.out.print("3. Cafe Details \n");

System.out.print("4. Library Details \n");

System.out.print("5. Transport Details \n");

System.out.print("6. Previous Menu \n");

System.out.print("7. Exit \n\n");

System.out.print("Enter your choice : ");

try{

int choice = input.nextInt();

switch(choice){

case 1: {

studentDetails();

break;

}

case 2: {

courseDetails();

break;

}

case 3: {

cafeDetails();

break;

}

case 4: {

libraryDetails();

break;

}

case 5: {

transportDetails();

break;

}

case 6: {

Main.Choices();

break;

}

case 7: {

System.exit(0);

}

default: {

System.out.print("Invalid Data! Try again...\n");

input.nextLine();

}

}

}

catch(Exception e){

System.out.print("Invalid Data! Try again...\n");

input.nextLine();

}

}

}

// Course Details

public static void courseDetails(){

System.out.print("*************************************************\n");

System.out.print("\t\t Course Details \n");

System.out.print("*************************************************\n\n");

input.nextLine();

while(true){

System.out.print("Enter the Student ID(XXXX-XXX-XXX) : ");

String regNumber = input.nextLine().toUpperCase();

if(Pattern.matches("SP\\d{2}-\\w{3}-\\d{3}|FA\\d{2}-\\w{3}-\\d{3}",regNumber)){

try{

File myfile = new File("students_data/courses/"+ regNumber +".txt");

if(myfile.exists()){

manageCourse(regNumber);

}

else{

File ff = new File("students_data/"+regNumber+".txt");

if(ff.exists()){

System.out.print("Student must have to register a course firstly!\n");

break;

}

else{

System.out.print("Student is not registered!\n");

break;

}

}

}

catch(Exception e){

System.out.print(e);

input.nextLine();

}

}

else{

System.out.print("Invalid ID! Try Again....\n");

}

}

}

// ManageCourse

public static void manageCourse(String regNumber){

boolean validInput = false;

while(true){

System.out.print("1. View Registered Courses\n");

System.out.print("2. Add new Course\n");

System.out.print("3. Delete course\n");

System.out.print("4. Previous Menu\n");

System.out.print("5. Exit\n");

System.out.print("Enter choice : ");

try{

int choice = input.nextInt();

switch(choice){

case 1:{

validInput = true;

viewCourse(regNumber);

break;

}

case 2:{

validInput = true;

addCourse(regNumber);

break;

}

case 3:{

validInput = true;

deleteCourse(regNumber);

break;

}

case 4:{

validInput = true;

admin();

break;

}

case 5:{

validInput = true;

System.exit(0);

break;

}

default:{

System.out.print("Invalid input! Try again!!\n");

}

}

}

catch(Exception e){

System.out.print("Invalid input! Try again!!\n");

input.nextLine();

}

}

}

// View Course

public static void viewCourse(String regNumber){

int length = 0;

try{

File file = new File("students_data/courses/"+ regNumber +".txt");

Scanner sc = new Scanner(file);

while(sc.hasNextLine()){

String line = sc.nextLine();

length++;

}

sc.close();

}

catch(Exception e){

System.out.print(e);

}

registeredCourses = new String[length];

System.out.print(regNumber +" registered in following courses : \n");

int[] space = {15,30,15,30};

try{

File file = new File("students_data/courses/"+ regNumber +".txt");

Scanner sc = new Scanner(file);

int i=0,j=0;

System.out.print("\n\n");

System.out.printf("%-5s%-15s%-30s%-15s%-30s%n","ID","Course_Code","Course_Title","Credit_Hours","Instructor");

System.out.println("------------------------------------------------------------------------------------------");

while(sc.hasNextLine()){

System.out.printf("%-5d",i);

String line = sc.nextLine();

registeredCourses[i] = line;

String[] data = line.split(",",4);

for(String item:data){

System.out.printf(("%-"+space[j]+"s"),item);

j++;

}

i++;

j=0;

System.out.println();

}

sc.close();

}

catch(Exception e){

System.out.print(e);

}

System.out.print("\n\n");

}

// Add new Course

public static void addCourse(String regNumber){

int semester = 0;

String sub = "";

try{

sub = regNumber.substring(0,4);

// Eliminating the semester from the st. ID

if(sub.compareTo("SP18")==0){

semester = 8;

}

else if(sub.compareTo("FA18")==0){

semester = 7;

}

else if(sub.compareTo("SP19")==0){

semester = 6;

}

else if(sub.compareTo("FA19")==0){

semester = 5;

}

else if(sub.compareTo("SP20")==0){

semester = 4;

}

else if(sub.compareTo("SP20")==0){

semester = 3;

}

else if(sub.compareTo("SP21")==0){

semester = 2;

}

else if(sub.compareTo("FA21")==0){

semester = 1;

}

// finding total_courses in file

int total_courses = 0;

try{

File file = new File("courses/"+ semester +".txt");

Scanner sc = new Scanner(file);

while(sc.hasNextLine()){

String line = sc.nextLine();

total_courses++;

}

sc.close();

}

catch(Exception e){

System.out.print(e);

}

courseDetails = new String[total_courses];

// Stroring data in a array.

try{

File file = new File("courses/"+ semester +".txt");

Scanner sc = new Scanner(file);

int i=0;

while(sc.hasNextLine()){

String line = sc.nextLine();

courseDetails[i] = line;

i++;

}

sc.close();

}

catch(Exception e){

System.out.print(e);

}

// filtering data in a array.

try{

File file = new File("students_data/courses/"+ regNumber +".txt");

Scanner sc = new Scanner(file);

while(sc.hasNextLine()){

String line = sc.nextLine();

for(int i=0;i<courseDetails.length;i++){

if(courseDetails[i].compareTo(line)==0){

courseDetails[i] = "";

}

}

}

sc.close();

}

catch(Exception e){

System.out.print(e);

}

// Didplaying available courses

int[] space = {15,30,15,30};

int size=0;

try{

int i=0,j=0;

System.out.print("\n\n");

System.out.printf("%-5s%-15s%-30s%-15s%-30s%n","ID","Course_Code","Course_Title","Credit_Hours","Instructor");

System.out.println("------------------------------------------------------------------------------------------");

for(String line : courseDetails){

if(line!=""){

System.out.printf("%-5d",i);

String[] data = line.split(",",4);

size++;

for(String item:data){

System.out.printf(("%-"+space[j]+"s"),item);

j++;

}

i++;

j=0;

System.out.println();

}

}

}

catch(Exception e){

System.out.print(e);

}

availableCourse = new String[size];

int index=0;

for(int y=0;y<courseDetails.length;y++){

if(courseDetails[y]!=""){

availableCourse[index] = courseDetails[y];

index++;

}

}

while(true){

try{

System.out.print("\nHow many courses student wants to add more :");

int amount = input.nextInt();

if(amount>availableCourse.length || amount<0){

System.out.print("Invalid input\n");

continue;

}

else if(amount==0){

break;

}

// Storing course ids in array..

int x=0;

String[] toRegister = new String[amount];

boolean alreadyAdded = false;

while(true){

try{

alreadyAdded = false;

System.out.print("\n*************course"+(x+1)+"*******************\n");

System.out.print("Enter choice :");

int choice = input.nextInt();

for(int z=0;z<x;z++){

if(toRegister[z].compareTo(availableCourse[choice])==0){

alreadyAdded = true;

break;

}

}

if(alreadyAdded){

System.out.print("Already Registered!\n");

continue;

}

else if(choice<availableCourse.length && choice>=0){

toRegister[x] = availableCourse[choice];

x++;

if(x==amount){

break;

}

}

else{

System.out.print("Invalid Id, Try again!\n");

continue;

}

}

catch(Exception e){

System.out.print(e);

}

}

try{

FileWriter fileWriter = new FileWriter("students_data/courses/"+ regNumber +".txt",true);

int j=0;

for(String e:toRegister){

fileWriter.write(e+"\n");

}

fileWriter.close();

System.out.println("Courses Added Successfully!");

break;

}

catch(Exception e){

System.out.print(e);

}

}

catch(Exception e){

System.out.print("Invalid input! Try again");

input.nextLine();

}

}

}

catch(Exception e){

System.out.print("error occurred!\n");

}

}

// Delete Course

public static void deleteCourse(String regNumber){

viewCourse(regNumber);

int remainingCourses = 0;

int canDelete = registeredCourses.length-4;

while(true){

System.out.print("You can drop only "+(canDelete)+" courses because student must have pick 4 courses!\n");

try{

if(canDelete==0){

System.out.print("You can't drop any course\n");

break;

}

System.out.print("\nHow many courses student wants to drop :");

int amount = input.nextInt();

remainingCourses = registeredCourses.length-amount;

if(amount>canDelete){

System.out.print("You can drop only "+(canDelete)+" courses because student must have pick 4 courses!\n");

continue;

}

else if(amount<0){

System.out.print("Invalid input! Try again!\n");

continue;

}

else if(amount==0 || canDelete==0){

System.out.print("No course can be dropped!\n");

break;

}

// Storing course ids in array..

int x=0;

while(true){

try{

if(x==amount){

break;

}

System.out.print("\n*************course"+(x+1)+"*******************\n");

System.out.print("Enter choice :");

int choice = input.nextInt();

if(choice<registeredCourses.length){

if(registeredCourses[choice]==""){

System.out.print("Same course can't be delete twice or more!\n");

continue;

}

else{

registeredCourses[choice]="";

x++;

}

}

else{

System.out.print("Invalid Id, Try again!\n");

continue;

}

}

catch(Exception e){

System.out.print("Invalid input! Try again...");

input.nextLine();

}

}

try{

FileWriter fileWriter = new FileWriter("students_data/courses/"+ regNumber +".txt");

fileWriter.write("");

fileWriter.close();

}

catch(Exception e){

System.out.print(e);

}

}

catch(Exception e){

System.out.print("Invalid input! Try again\n");

input.nextLine();

continue;

}

try{

FileWriter ff = new FileWriter("students_data/courses/"+ regNumber +".txt",true);

for(int i=0;i<registeredCourses.length;i++){

if(registeredCourses[i]!=""){

ff.write(registeredCourses[i]+"\n");

}

}

ff.close();

}

catch(Exception e){

System.out.print(e);

}

System.out.print("Courses deleted Successfully!\n");

break;

}

}

// Student details

public static void studentDetails(){

System.out.print("*************************************************\n");

System.out.print("\t\t Student Details \n");

System.out.print("*************************************************\n\n");

input.nextLine();

while(true){

System.out.print("Enter the Student ID(XXXX-XXX-XXX) : ");

String regNumber = input.nextLine().toUpperCase();

if(Pattern.matches("SP\\d{2}-\\w{3}-\\d{3}|FA\\d{2}-\\w{3}-\\d{3}",regNumber)){

try{

File file = new File("students_data/"+regNumber+".txt");

if(file.exists()){

Scanner sc = new Scanner(file);

System.out.print("\n");

while(sc.hasNextLine()){

String line = sc.nextLine();

String[] data = line.split(":");

System.out.printf("%-20s%-10s%s%n",data[0].toUpperCase(),":",data[1]);

}

System.out.print("\n******************************************************************\n");

sc.close();

break;

}

else{

System.out.print("No Record Found\n");

break;

}

}

catch(Exception e){

System.out.print(e);

input.nextLine();

}

}

else{

System.out.print("Invalid ID! Try Again....\n");

}

}

}

// Cafe Details

public static void cafeDetails(){

System.out.print("*************************************************\n");

System.out.print("\t\t Cafe Details \n");

System.out.print("*************************************************\n\n");

input.nextLine();

String regNumber="";

while(true){

System.out.print("Enter the Student ID(XXXX-XXX-XXX) : ");

regNumber = input.nextLine().toUpperCase();

if(Pattern.matches("SP\\d{2}-\\w{3}-\\d{3}|FA\\d{2}-\\w{3}-\\d{3}",regNumber)){

try{

File file = new File("cafe/CafeBills/FinalBills/"+regNumber+".txt");

if(file.exists()){

Scanner sc = new Scanner(file);

System.out.print("\n");

int i=1;

while(sc.hasNextLine()){

String line = sc.nextLine();

System.out.print(line+"\n");

}

System.out.print("*****************************************************\n");

sc.close();

break;

}

else{

System.out.print("No Record Found\n");

break;

}

}

catch(Exception e){

System.out.print(e);

input.nextLine();

}

}

else{

System.out.print("Invalid ID! Try Again....\n");

}

}

// Displaying menu..

while(true) {

System.out.print("\n1. DesiFood Bill Details \n");

System.out.print("2. FastFood Bill Details \n");

System.out.print("3. Coffee Bill Details \n");

System.out.print("4. SoftDrinks Bill Details \n");

System.out.print("5. Juices Bill Drink \n");

System.out.print("6. Exit \n\n");

System.out.print("Enter your choice : ");

boolean flag = false;

try{

int choice = input.nextInt();

switch(choice){

case 1: {

System.out.print("********** Desi Food Bill *********\n");

try{

File file = new File("cafe/CafeBills/DesiFood/"+regNumber+".txt");

if(file.exists()){

Scanner sc = new Scanner(file);

System.out.print("\n");

int i=1;

while(sc.hasNextLine()){

String line = sc.nextLine();

System.out.print(line+"\n");

}

System.out.print("*****************************************************\n");

sc.close();

break;

}

else{

System.out.print("No Record Found\n");

break;

}

}

catch(Exception e){

System.out.print(e);

input.nextLine();

}

break;

}

case 2: {

System.out.print("********** Fast Food Bill *********\n");

try{

File file = new File("cafe/CafeBills/FastFood/"+regNumber+".txt");

if(file.exists()){

Scanner sc = new Scanner(file);

System.out.print("\n");

int i=1;

while(sc.hasNextLine()){

String line = sc.nextLine();

System.out.print(line+"\n");

}

System.out.print("*****************************************************\n");

sc.close();

break;

}

else{

System.out.print("No Record Found\n");

break;

}

}

catch(Exception e){

System.out.print(e);

input.nextLine();

}

break;

}

case 3: {

System.out.print("********** Coffee Bill *********\n");

try{

File file = new File("cafe/CafeBills/MyCoffee/"+regNumber+".txt");

if(file.exists()){

Scanner sc = new Scanner(file);

System.out.print("\n");

int i=1;

while(sc.hasNextLine()){

String line = sc.nextLine();

System.out.print(line+"\n");

}

System.out.print("*****************************************************\n");

sc.close();

break;

}

else{

System.out.print("No Record Found\n");

break;

}

}

catch(Exception e){

System.out.print(e);

input.nextLine();

}

break;

}

case 4: {

System.out.print("********** SoftDrinks Bill *********\n");

try{

File file = new File("cafe/CafeBills/MySoftDrinks/"+regNumber+".txt");

if(file.exists()){

Scanner sc = new Scanner(file);

System.out.print("\n");

int i=1;

while(sc.hasNextLine()){

String line = sc.nextLine();

System.out.print(line+"\n");

}

System.out.print("*****************************************************\n");

sc.close();

break;

}

else{

System.out.print("No Record Found\n");

break;

}

}

catch(Exception e){

System.out.print(e);

input.nextLine();

}

break;

}

case 5: {

System.out.print("********** Juices Bill *********\n");

try{

File file = new File("cafe/CafeBills/MyJuiceOrPlantDrink/"+regNumber+".txt");

if(file.exists()){

Scanner sc = new Scanner(file);

System.out.print("\n");

int i=1;

while(sc.hasNextLine()){

String line = sc.nextLine();

System.out.print(line+"\n");

}

System.out.print("*****************************************************\n");

sc.close();

break;

}

else{

System.out.print("No Record Found\n");

break;

}

}

catch(Exception e){

System.out.print(e);

input.nextLine();

}

break;

}

case 6: {

System.out.print("\n");

flag = true;

break;

}

default: {

System.out.print("Invalid Data! Try again...\n");

input.nextLine();

}

}

if(flag){

break;

}

}

catch(Exception e){

System.out.print("Invalid Data! Try again...\n");

input.nextLine();

}

}

}

// Library Details

public static void libraryDetails(){

System.out.print("*************************************************\n");

System.out.print("\t\t Library Details \n");

System.out.print("*************************************************\n\n");

input.nextLine();

while(true){

System.out.print("Enter the Student ID(XXXX-XXX-XXX) : ");

String regNumber = input.nextLine().toUpperCase();

if(Pattern.matches("SP\\d{2}-\\w{3}-\\d{3}|FA\\d{2}-\\w{3}-\\d{3}",regNumber)){

try{

File file = new File("library/BorrowedBooks/"+regNumber+".txt");

if(file.exists()){

Scanner sc = new Scanner(file);

System.out.print("\n");

System.out.print("Following books has been borrowed : \n");

int i=1;

while(sc.hasNextLine()){

String line = sc.nextLine();

System.out.print(i+". "+line+"\n");

}

System.out.print("*****************************************************\n");

sc.close();

break;

}

else{

System.out.print("No Record Found\n");

break;

}

}

catch(Exception e){

System.out.print(e);

}

}

else{

System.out.print("Invalid ID! Try Again....\n");

}

}

}

// Transport Details

public static void transportDetails(){

System.out.print("*************************************************\n");

System.out.print("\t\t Transport Details \n");

System.out.print("*************************************************\n\n");

input.nextLine();

while(true){

System.out.print("Enter the Student ID(XXXX-XXX-XXX) : ");

String regNumber = input.nextLine().toUpperCase();

if(Pattern.matches("SP\\d{2}-\\w{3}-\\d{3}|FA\\d{2}-\\w{3}-\\d{3}",regNumber)){

try{

File file = new File("transport/TransportFiles/"+regNumber+".txt");

if(file.exists()){

Scanner sc = new Scanner(file);

System.out.print("\n");

int i=1;

while(sc.hasNextLine()){

String line = sc.nextLine();

System.out.print(line+"\n");

}

System.out.print("*****************************************************\n");

sc.close();

break;

}

else{

System.out.print("No Record Found\n");

break;

}

}

catch(Exception e){

System.out.print(e);

input.nextLine();

}

}

else{

System.out.print("Invalid ID! Try Again....\n");

}

}

}

}