package cruise_boarding_sys;

import java.util.Arrays;
import java.util.Scanner;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.BufferedReader;
import java.io.FileReader;

public class BoardingSys {

    //declaring scanner to take input
    static Scanner kb = new Scanner(System.in);

    public static void main(String[] args) throws Exception {



        //declaring cabin array
        String[] cabins = new String[12];

        while(true) {
            System.out.println("Enter option: "
                    + "\nA - to add cabin crew, "
                    + "\nV - to view all cabins,"
                    + "\nE - print empty cabins,"
                    + "\nD - delete customer from cabin,"
                    + "\nF - find cabin using Customer name,"
                    + "\nS - store program data into file,"
                    + "\nL - load program data from the file,"
                    + "\nO - view passengers in alphabetical order");

            char option = kb.next().charAt(0); // reads String from keyboard and save it into option
            System.out.println("You selected option: " + option);
            kb.nextLine(); //fixes issues with nextLine()
            //code for option A

            switch (option) {
                case 'A':
                    cabins = addCustomer(cabins);
                    break;
                case 'V':
                    printCabins(cabins);
                    break;
                case 'E':
                    printEmptyCabins(cabins);
                    break;
                case 'D':
                    cabins = deleteCustomerFromCabin(cabins);
                    break;
                case 'F':
                    findCabinWithCusName(cabins);
                    break;
                case 'S':
                    storeDataInFile(cabins);
                    break;
                case 'L':
                    cabins = loadProgramData();
                    break;
                case 'O':
                    viewPassengerInOrder(cabins);
                    break;
                default:
                    System.out.println("Invalid option");
                    break;
            }
        }
    }
    private static void viewPassengerInOrder(String[] cabins) {

        String[] cabinsSorted = new String[12];

        for(int i =0; i<cabins.length;i++) {
            if(!(cabins[i]== null)) {
                for(int j=i+1; j<cabins.length; j++) {
                    //compares each elements of the array to all the remaining elements
                    if(!(cabins[j]==null)) {
                        if(cabins[i].compareTo(cabins[j])>0) {

                            //swap elements with each other
                            String temp = cabins[i];
                            cabins[i] = cabins[j];
                            cabins[j] = temp;
                        }
                    }

                }
            }

        }

        System.out.println("Viewing all cabins: ");
        for(int i=0;i<cabins.length;i++) {
            if(!(cabins[i] == null)) {
                System.out.println(cabins[i]);
            }
        }


    }
    private static String[] loadProgramData() throws Exception {
        System.out.println("Loading data from CabinData.txt");
        BufferedReader reader = new BufferedReader(new FileReader("CabinData.txt"));
        String[] cabins = new String[12];
        for (int i=0; i<cabins.length;i++) {
            String cabinCus = reader.readLine();
            //if cabinCus is string null, transform it to NULL type
            if(cabinCus.equals("null")) {
                cabins[i] = null;
            }else {
                cabins[i] = cabinCus;
            }

        }
        reader.close();
        return cabins;
    }
    private static void storeDataInFile(String[] cabins) throws Exception {
        System.out.println("Saving data in CabinData.txt");
        BufferedWriter writer = new BufferedWriter(new FileWriter("CabinData.txt", false));
        for(int i=0;i<cabins.length;i++) {
            String message = cabins[i];
             writer.write(message);
             writer.newLine();
        }
        writer.flush();
        System.out.println("Data successfully saved");

    }
    private static void findCabinWithCusName(String[] cabins) {
        System.out.println("Enter customer name:");
        String cusName = kb.nextLine();
        boolean found = false;
        for(int i=0; i<cabins.length;i++) {
            //check to see if its not null first so we can use .equals to check the customer name
            //Cannot invoke "String.equals(Object)" because "cabins[i]" is null
            if(!(cabins[i] == null)) {
                if(cabins[i].equals(cusName)) {
                    System.out.println("Customer " + cusName + " is in cabin " + (i+1));
                    found = true;
                    break;
                }
            }
        }
        if(!found) {
            System.out.println("Customer " + cusName + " is not on the ship.");
        }


    }
    private static String[] deleteCustomerFromCabin(String[] cabins) {

        //delete customer by cabin index/id
        System.out.println("Please enter the index of the cabin you would like to empty: ");
        int cabinIndex = kb.nextInt() - 1;
        System.out.println("Customer "+ cabins[cabinIndex] +" has been removed from the cabin");
        cabins[cabinIndex] = null;
        return cabins;

    }
    private static void printEmptyCabins(String[] cabins) {
        System.out.println("Viewing all empty cabins: ");
        for(int i=0;i<cabins.length;i++) {
            if(cabins[i] == null) {
                System.out.println("Cabin number: " + (i+1) + " is empty.");
            }
        }
    }
    private static void printCabins(String[] cabins) {
        System.out.println("Viewing all cabins: ");
        for(int i=0;i<cabins.length;i++) {
            System.out.println("Cabin number: " + (i+1) + " is ocuppied by: " + cabins[i]);
        }

    }
    //add customer method that takes the old cabins array and returns the new cabins array
    private static String[] addCustomer(String[] cabins) {

        //check if customer is entered
        boolean entered = false;
        int cabinSpot = 0;
        String cusName = "";
        //iterate through cabin indexes in order to insert new cus
        for(int i=0;i<cabins.length;i++) {
            //check if cabin is empty
            if(cabins[i] == null) {
                //customer entered cabin
                entered = true;
                //ask for cus name
                System.out.println("Please enter customer name");
                //read cus name
                cusName = kb.nextLine();
                //save cus name into the cabin on the specific index
                cabins[i] = cusName;
                cabinSpot = i+1;
                break;
            }
        }
        if(!entered /* entered == false */) {
            System.out.println("There are no empty cabins");
        }else {
            System.out.println("Customer entered cabin " + cabinSpot + " and it's name is: "  + cusName);
        }

        return cabins;
    }
}