package integratedlibraryclient;

import ejb.BookAuthorManagerBeanRemote;
import ejb.BookLoanManagerBeanRemote;
import ejb.LibMemberManagerBeanRemote;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import javax.ejb.EJB;
import java.util.*;


public class Main {

    @EJB
    private static LibMemberManagerBeanRemote lmb;
    @EJB
    private static BookAuthorManagerBeanRemote ba;
    @EJB
    private static BookLoanManagerBeanRemote bl;

    public Main(){}

    public static void main(String[] args) {
        Main admin = new Main();
        admin.doILS(args);
    }

    public void doILS(String[] args){
        try{
            String choice = "";
            Scanner sc = new Scanner(System.in);
            while(!choice.equals("0")){
                //main menu
                System.out.println("***************************************");
                System.out.println("Welcome to ILS Admin Portal!");
                System.out.println("***************************************");
                System.out.println("Please enter your choice:");
                System.out.println("1. Add User");
                System.out.println("2. Delete User");
                System.out.println("3. Add Author");
                System.out.println("4. Add Book");
                System.out.println("5. Update Book");
                System.out.println("6. Delete Book");
                System.out.println("7. Checkout Book");
                System.out.println("8. Return Book");
                System.out.println("9. View Reservations");
                System.out.println("10. View Checkouts");
                System.out.println("11. View Fines");
                System.out.println("12. Process Request");
                System.out.println("0: Exit");

                System.out.print("Enter Choice: ");
                BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                choice = br.readLine();

                if(choice.equals("1")){
                    addUser(sc);
                } else if(choice.equals("2")){
                    deleteUser(sc);
                } else if(choice.equals("3")){
                    addAuthor(sc);
                } else if(choice.equals("4")){
                    addBook(sc);
                } else if(choice.equals("5")){
                    updateBook(sc);
                } else if(choice.equals("6")){
                    deleteBook(sc);
                } else if(choice.equals("7")){
                    checkoutBook(sc);
                } else if(choice.equals("8")){
                    returnBook(sc);
                } else if(choice.equals("9")){
                    viewReservation(sc);
                } else if(choice.equals("10")){
                    viewCheckout(sc);
                } else if(choice.equals("11")){
                    viewFine(sc);
                } else if(choice.equals("12")){
                    processRequest(sc);
                } else if(choice.equals("0")){
                    return;
                } else{
                    return;
                }
            }

        }catch(Exception ex){
            System.err.println("Caught an unexpected exception!");
        }
    }

    private void addUser(Scanner sc){
        try{
            System.out.println("---ADD USER---");
            System.out.print("Enter User Name: ");
            String inName = sc.nextLine();
            System.out.print("Enter Default Password: ");
            String inPass = sc.nextLine();
            System.out.print("Enter Default Password Again: ");
            String inPass2 = sc.nextLine();
            System.out.print("Enter Contact Number: ");
            String inContact = sc.nextLine();
            System.out.print("Enter E-mail: ");
            String inEmail = sc.nextLine();
            System.out.print("Enter Address: ");
            String inAddress = sc.nextLine();

            String result = lmb.createMember(inName, inPass, inContact, inEmail, inAddress, inPass2);

            System.out.println(result);
        } catch(Exception ex) {
            System.out.println("\nFailed to create member because " + ex.getMessage() + "\n");
        }
    }

    private void deleteUser(Scanner sc){
        try{
            System.out.println("---ADD USER---");
            System.out.print("Enter User Name: ");
            String username = sc.nextLine();
            String result = lmb.deleteMember(username);
            System.out.println(result);
        } catch (Exception ex){
            System.out.println("\n Failed to delete user becase " + ex.getMessage() + "\n");
        }
    }

    private void addAuthor(Scanner sc){
        try{
            System.out.println("---ADD AUTHOR---");
            System.out.print("Enter Author Name: ");
            String inAuthorName = sc.nextLine();
            System.out.print("Enter Author's Description: ");
            String inAuthorDesc = sc.nextLine();

            String authorID = ba.createAuthor(inAuthorName, inAuthorDesc);

            System.out.println("\nAuthor added successfully!\n");

            System.out.println("Author ID: " + authorID);
        } catch (Exception ex){
            System.out.println("\n Failed to create author becase " + ex.getMessage() + "\n");
        }
    }

    private void addBook(Scanner sc){
        try{
            System.out.println("---ADD BOOK---");
            System.out.print("Enter Title: ");
            String inTitle = sc.nextLine();

            System.out.print("Enter Number of Authors: ");
            int numAuthors = sc.nextInt();

            String[] authorArr = new String[numAuthors];

            for(int i=0; i<numAuthors; i++){
                System.out.print("Enter ID of Author: ");
                authorArr[i] = sc.next();
            }
            sc.nextLine();
            System.out.print("Enter Publisher: ");
            String inPub = sc.nextLine();
            System.out.print("Enter Publication Year: ");
            int inPubYear = sc.nextInt();
            sc.nextLine();
            System.out.print("Enter ISBN: ");
            String inISBN = sc.nextLine();
            System.out.print("Enter Copy No: ");
            int inCopyNo = sc.nextInt();

            sc.nextLine();

            String result = ba.createBook(inTitle, inPub, inPubYear, inISBN, inCopyNo, authorArr);
            System.out.println(result);

        } catch(Exception ex) {
            System.out.println("\nFailed to create book because " + ex.getMessage() + "\n");
        }
    }

    private void updateBook(Scanner sc){
        try{
            System.out.println("---UPDATE BOOK---");
            System.out.print("Enter ISBN: ");
            String oldISBN = sc.nextLine();
            System.out.print("Enter Copy Number: ");
            int oldCopyNo = sc.nextInt();
            sc.nextLine();
            System.out.println("---Enter Details of New Book---");
            System.out.print("Enter New Title: ");
            String newTitle = sc.nextLine();
            System.out.print("Enter New Publisher: ");
            String newPub = sc.nextLine();
            System.out.print("Enter New Publication Year: ");
            int newPubYear = sc.nextInt();
            sc.nextLine();
            System.out.print("Enter New ISBN: ");
            String newISBN = sc.nextLine();
            System.out.print("Enter New Copy Number: ");
            int newCopyNo = sc.nextInt();
            System.out.print("Enter New Number of Authors: ");
            int newNumAuthors = sc.nextInt();
            sc.nextLine();
            String[] authorArr = new String[newNumAuthors];

            for(int i=0; i<newNumAuthors; i++){
                System.out.print("Enter ID of Author " + (i+1) + ":");
                authorArr[i] = sc.next();
            }
            sc.nextLine();

            String result = ba.updateBook(oldISBN, oldCopyNo, newTitle, newPub, newPubYear, newISBN, newCopyNo, authorArr);
            System.out.println(result);
        }catch(Exception ex){
            System.out.println("\nFailed to update book because " + ex.getMessage() + "\n");
        }
    }

    public void deleteBook(Scanner sc){
        try {
            System.out.println("---DELETE BOOK---");
            System.out.print("Enter ISBN: ");
            String isbn = sc.nextLine();
            System.out.print("Enter Copy No: ");
            int copyNo = sc.nextInt();
            sc.nextLine();
            String result = ba.deleteBook(isbn, copyNo);
            System.out.println(result);
        } catch (Exception ex) {
            System.out.println("\nFailed to delete book because " + ex.getMessage() + "\n");

        }
    }

    public void checkoutBook(Scanner sc){
        try {
            System.out.println("---CHECKOUT BOOK---");
            System.out.print("Enter Username: ");
            String username = sc.nextLine();
            System.out.print("Enter ISBN: ");
            String isbn = sc.nextLine();
            System.out.print("Enter Copy No: ");
            int copyNo = sc.nextInt();
            sc.nextLine();
            String dueDate = bl.checkoutBook(username, isbn, copyNo);
            if(dueDate.equals("Book currently unavailable")){
                System.out.println(dueDate);
            }
            else {
                System.out.println("Book successfully checkout!");
                System.out.println("Due date: " + dueDate);
            }
        } catch (Exception ex) {
            System.out.println("\nFailed to checkout book because " + ex.getMessage() + "\n");
        }
    }

    public void returnBook(Scanner sc){
        try {
            System.out.println("---RETURN BOOK---");
            System.out.print("Enter ISBN: ");
            String isbn = sc.nextLine();
            System.out.print("Enter Copy No: ");
            int copyNo = sc.nextInt();
            sc.nextLine();
            int days = bl.returnBook(isbn, copyNo);
            if(days > 0)
                System.out.println("Book overdue. Fine successfully created");
            else if(days == -1)
                System.out.println("Error, no checkout for the book");

            System.out.println("Book successfully returned!");
        } catch (Exception ex) {
            System.out.println("\nFailed to checkout book because " + ex.getMessage() + "\n");
        }
    }

    public void viewReservation(Scanner sc){
        try {
            System.out.println("---VIEW RESERVATIONS---");
            System.out.print("Enter ISBN: ");
            String isbn = sc.nextLine();
            System.out.print("Enter Copy No: ");
            int copyNo = sc.nextInt();
            sc.nextLine();
            String returnMsg = (String) bl.viewReservations(isbn, copyNo).get(0);
            ArrayList results = bl.viewReservations(isbn, copyNo);
            int size =  bl.viewReservations(isbn, copyNo).size();

            if(returnMsg.equals("Error! Incorrect book details") || returnMsg.equals("No reservations found!")){
                System.out.println(returnMsg);
            } else {
                System.out.println("BookTitle: " + returnMsg);
                for(int i=1; i<size; i++){
                    Object o = results.get(i);
                    String reservation = (String) o;
                    StringTokenizer st = new StringTokenizer(reservation, " # ");

                    System.out.println(st.nextToken());
                    System.out.println("Username: " + st.nextToken());
                    System.out.println("Email: " + st.nextToken());
                    System.out.println("Reservation Time: " + st.nextToken() + " " + st.nextToken());
                    System.out.println("Note: " + st.nextToken());
                }
            }
        } catch (Exception ex) {
            System.out.println("\nFailed to checkout book because " + ex.getMessage() + "\n");
        }
    }

    public void viewCheckout(Scanner sc){
        try {
            System.out.println("---VIEW CURRENT CHECKOUTS---\n");

            if(bl.viewCheckouts().get(0).equals("No checkout found!")){
                System.out.println("No checkout found!");
            }
            else {
                for(Object o: bl.viewCheckouts()){
                    String checkout = (String) o;
                    StringTokenizer st = new StringTokenizer(checkout, " # ");
                        System.out.println("ISBN: " + st.nextToken());
                        System.out.println("Copy No: " + st.nextToken());
                        System.out.println("Title: " + st.nextToken());
                        System.out.println("Username: " + st.nextToken());
                        System.out.println("E-mail Address: " + st.nextToken());
                        System.out.println("Loan Date: " + st.nextToken());
                        System.out.println("Due Date: " + st.nextToken() + "\n\n");
                }
            }
        } catch (Exception ex) {
            System.out.println("\nFailed to get checkout books because " + ex.getMessage() + "\n");
        }
    }

    public void viewFine(Scanner sc){
        try {
            System.out.println("---VIEW FINES---\n");

            if(bl.viewFines().get(0).equals("No fine found!")){
                System.out.println("No fine found!");
            }
            else {
                for(Object o: bl.viewFines()){
                    String fine = (String) o;
                    String[] fineS = fine.split("#");
                        System.out.println("FineID: " + fineS[0]);
                        System.out.println("Fine Date: " + fineS[1]);
                        System.out.println("Fine Amount: " + fineS[2]);
                        System.out.println("Username: " + fineS[3]);
                        System.out.println("E-mail Address: " + fineS[4] + "\n\n");
                }
            }

        } catch (Exception ex) {
            System.out.println("\nFailed to view fine because " + ex.getMessage() + "\n");
        }
    }

    public void processRequest(Scanner sc){
        try {
            System.out.println("---VIEW REQUESTS---\n");

            if(bl.viewRequest().get(0).equals("No request found!")){
                System.out.println("No request found!");
            }
            else {
                for(Object o: bl.viewRequest()){
                    String req = (String) o;
                    StringTokenizer st = new StringTokenizer(req, " # ");
                    System.out.println("Request ID: " + st.nextToken());
                    System.out.println("Username: " + st.nextToken());
                    System.out.println("Time: " + st.nextToken());
                    System.out.println("Message: " + st.nextToken() + "\n");
                }

                System.out.print("Enter the request to be processed: ");
                String requestID = sc.nextLine();
                System.out.print("Change the status to: ");
                String status = sc.nextLine();
                System.out.print("Comment: ");
                String comment = sc.nextLine();
                String result = bl.processRequest(requestID, status, comment);

                System.out.println(result);
            }
        } catch (Exception ex) {
            System.out.println("\nFailed to get request because " + ex.getMessage() + "\n");
        }
    }
}