Program 4

import java.util.*;
import java.io.*;
public class AsTheCrowFlies {
    public static Scanner stdin = null;
    public static void main(String[] args) {
        while (true){
            menu();
        }
    }
    public static void menu() {
        //Displays the menu
        System.out.println("1. Load available cities from a file");
        System.out.println("2. Display available cities");
        System.out.println("3. Create a trip");
        System.out.println("4. Add a city to available cities");
        System.out.println("5. Exit Program");
        System.out.println("Enter choice as integer [1-5]: ");
        stdin = new Scanner(System.in);
        int choice = getMenuChoice(stdin);
        while (choice < 6 && choice>=0 ) {
            //Checks if the input is valid
            if (choice!=0) {
                //Executes if the menu choice is 1
                if(choice == 1) {
                    loadFromFile(stdin);
                    break;
                }

                /*System.out.print("Enter the filename: ");
                    stdin = new Scanner(System.in);
                    while(stdin.hasNext()) {
                        System.out.println("swiggity");
                        System.out.println("poon");
                        String filename = stdin.nextLine();
                        loadFromFile(stdin,filename);
                        break;
                    }
                    System.out.println("doot doot");
                 */



                //Executes if the menu choice is 2
                else if (choice==2) {
                    //displayAvailableCities();
                    break;
                }
                //Executes if the menu choice is 3
                else if(choice==3) {
                    //Creates an instance of Trip
                    Trip trip = new Trip();
                    break;
                }
                //Executes if the menu choice is 44
                else if(choice==4) {
                    break;
                }
                //Executes if the menu choice is 5
                else if(choice==5) {
                    System.out.println("Thankyou for your business.");
                    break;
                }
            }

            //Displays invalid input message
            else {
                while (choice==0){
                    System.out.println("Enter choice as integer [1-5]: ");
                    choice = getMenuChoice(stdin);
                }
                break;

            }
        }
    }


    //Method used to read the input for the menu choice
    public static int getMenuChoice (Scanner input) {
        int menuChoice = 0;
        if (input.hasNextInt()){
            menuChoice += input.nextInt();
            //String clear = input.nextLine();
            if (menuChoice < 5 && menuChoice > 0) {
                return menuChoice;
            }
            else {
                System.out.println("Invalid input. Try again.");
                return 0;
            }
        }
        else if (input.hasNextLine()) {
            String clear = input.nextLine();
            System.out.println("Invalid input. Try again.");
            return 0;
        }
        return 0;
    }


    public static void  loadFromFile (Scanner stdin) {
        Scanner scanner = null;
        System.out.print("Enter the filename: ");
        String filename = "";
        if (stdin.hasNext()) {
            filename = stdin.nextLine();
        }

        //filename = scanner.nextLine();
        int cityCount = 0;
        try {
            scanner = new Scanner(new File(filename));
            while (scanner.hasNextLine()) {
                String line = scanner.nextLine();
                String state = line.substring(0, line.indexOf(','));
                String name = line.substring(0, line.indexOf(','));
                String lattitude = line.substring(0, line.indexOf(','));
                String longitude = line.substring(0, (line.length()-1));
                City newCity = new City(state,name,
                        Double.parseDouble(lattitude),
                        Double.parseDouble(longitude));
                Trip.addCity(newCity);
                cityCount++;

            }
        } catch (FileNotFoundException e) {
            System.out.println("Unable to read file.");
        }
        System.out.println(cityCount + " cities added");
        System.out.println();
    }


}