import java.util.Scanner;
public class WaterBilling {

       static String name,address;
       static double prevReading,currReading,sub = 0.0,due = 0.0,consumed;
       static int rate,yearser;
       static Scanner scr = new Scanner(System.in);

    public static void main (String[]args){

         int mainMenu = -1;
        while (mainMenu != 0) {   //while loop for looping the menu until the user press exit
            menu();  //calling the menu user defined method
            mainMenu = scr.nextInt(); //getting user choice
            scr.nextLine();
            switch (mainMenu) {
                case 0:
                       exit();
                       break;
                            //calling the userdefined methods
                case 1:
                       add();
                       break;
                        //calling the userdefined methods
                case 2:
                           //calling the userdefined methods
                case 3:
                        display();
                        break;//calling the userdefined methods
                case 4:
                           //calling the userdefined methods
                default: System.out.println("Out of range");
            }
        }
    }

        static void menu() {                   //the menu output
        System.out.println("-------[Water Billing System]-------");
        System.out.println("[1] Create a new user account.");
        System.out.println("[2] Update a current account");
        System.out.println("[3] Show accounts for all users.");
        System.out.println("[4] Try looking for an account here.");
        System.out.println("[0] Exit");

    }
        static void add(){
            System.out.println("Name: ");
                       name = scr.nextLine();
            System.out.println("Address: ");
                       address = scr.nextLine();
            System.out.println("Previous Meter Reading: ");
                       prevReading = scr.nextDouble();
            System.out.println("Current Meter Reading: ");
                       currReading = scr.nextDouble();
                    consumed = currReading - prevReading;
            System.out.println("[1] Residential");
            System.out.println("[2] Business");
                   rate = scr.nextInt();
        if (rate == 1) {
            if (consumed > 10) {
                sub = 200 + ((consumed - 10) * 30);
            }
            if (consumed <= 10) {
                sub = 200;
            }
        } else if (rate == 2) {
            if (consumed > 20) {
                sub = 500 + ((consumed - 20) * 50);
            }
            if (consumed <= 20) {
                sub = 500;
            }
        System.out.println("how many years in using the service?");
        yearser = scr.nextInt();
        if (yearser >= 15 ) {
            due = sub - (sub * (15/100));
            System.out.println("15% promo discount applied!");
        } else {
            due = sub;
           System.out.println("No promo discount appllied!");
        }
        }



       }

       static void display(){
           System.out.println("Name: "+name);
           System.out.println("Address: "+address);
           System.out.println("Previous Meter Reading: "+prevReading);
           System.out.println("Current Meter Reading: "+currReading);
           System.out.println("Total Payment Due: "+due);
       }

     static int exit() {
        return 0;
    }

}