FinalsWaterBilling

import java.util.Scanner;
import java.util.ArrayList; //arraylist uses non prmitive data type


public class Defense_WaterBilling {   //class

    static ArrayList<String> name = new ArrayList<String> ();           //setting arraylist as a global varibale to access in the whole parts of the program
    static ArrayList<String> address = new ArrayList<String> ();
    static ArrayList<Double> prevMreading = new ArrayList<Double> ();
    static ArrayList<Double> currMreading = new ArrayList<Double> ();
    static ArrayList<Double> Dues = new ArrayList<Double> ();
    static ArrayList<Double> consumption = new ArrayList<Double> ();
    static ArrayList<String> discount = new ArrayList<String> ();
    static Scanner scr = new Scanner(System.in);     // initializing the scanner as a global variable also

    public static void main(String[] args) {   //the main method includes the while loop for looping the main menu and uses switch statement

        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(); //calling the userdefined methods
                case 1:
                         add();
                         break;//calling the userdefined methods
                case 2:
                         update();
                         break;//calling the userdefined methods
                case 3:
                         display();
                         break;//calling the userdefined methods
                case 4:
                         search();
                         break;//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");
        System.out.println("Enter Your Choice");

    }

        static void add() {
        String name, address;
        double prev, curr, due = 0.0, sub = 0.0;
        int rate;
                      System.out.println("------Create a new user account!------");
                        System.out.println("Name: ");
            name = scr.nextLine();
        Defense_WaterBilling.name.add(name);
               System.out.println("Address: ");
        address = scr.nextLine();
        Defense_WaterBilling.address.add(address);
                 System.out.println("Previous reading: ");
        prev = scr.nextDouble();
        prevMreading.add(prev);
                   System.out.println("Current reading: ");
        curr = scr.nextDouble();
        currMreading.add(curr);
                     System.out.println("[1] Residential");
                       System.out.println("[2] Business");
        rate = scr.nextInt();
        double consumed = curr - prev;
        consumption.add(consumed);
        if (rate == 1) {                    //nested if to get the sub value
            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;
            }
        }
        int yearser;
        System.out.println("how many years in using the service?");
        yearser = scr.nextInt();
        if (yearser >= 15 ) {
            due = sub - (sub * (15/100));
            discount.add("15% promo discount applied!");
        } else {
            due = sub;
            discount.add("No promo discount appllied!");
        }
        Dues.add(due);
    }

        static void update() {
        String name, newName, newAddress;
        System.out.println("------Update a current account------!");
        System.out.println("Name: ");
        name = scr.nextLine();
        int position = 0;
        boolean matched = false;
        for (String profile : Defense_WaterBilling.name) {
            if (profile.contains(name)) {
                matched = true;
                position = Defense_WaterBilling.name.indexOf(profile);
                break;
            } else {
                matched = false;
            }
        }
        if (matched == true) {
            int modify;
            System.out.println("[1] Update name");
            System.out.println("[2] Update address");
            modify = scr.nextInt();
            scr.nextLine();
            switch (modify) {
                case 1:
                    System.out.println("New name: ");
                    newName = scr.nextLine();
                    Defense_WaterBilling.name.set(position, newName);
                    break;
                case 2:
                    System.out.println("New address: ");
                    newAddress = scr.nextLine();
                    address.set(position, newAddress);
                    break;
                default:
                    System.out.println("Unknown command!");
                    break;
            }
        } else {
            System.out.println("No data found");
        }
    }

        static void display() {
        System.out.println("------Show accounts for all users!------");
        for (int i = 0; i < name.size(); i++) {
            System.out.println("Name: " + name.get(i));
            System.out.println("Address: " + address.get(i));
            System.out.println("Previous reading: " + prevMreading.get(i));
            System.out.println("Current reading: " + currMreading.get(i));
            System.out.println("Current consumption: " + consumption.get(i));
            System.out.println("Total payment due: " + Dues.get(i));
            System.out.println("Promo: " + discount.get(i));
            System.out.println("");


        }
    }

        static void search() {
        int position = 0, searchBy;
        String name, address;
        boolean matched = false;
        System.out.println("------Try looking for an account here!------");
        System.out.println("[1] By name");
        System.out.println("[2] By address");
        searchBy = scr.nextInt();
        scr.nextLine();
        switch (searchBy) {
            case 1:
                System.out.println("Name: ");
                name = scr.nextLine();
                for (String profile : Defense_WaterBilling.name) {
                    if (profile.contains(name)) {
                        matched = true;
                        position = Defense_WaterBilling.name.indexOf(profile);
                        break;
                    } else {
                        matched = false;
                    }
                }   break;
            case 2:
                System.out.println("Address: ");
                address = scr.nextLine();
                for (String profile : Defense_WaterBilling.address) {
                    if (profile.contains(address)) {
                        matched = true;
                        position = Defense_WaterBilling.address.indexOf(profile);
                        break;
                    } else {
                        matched = false;
                    }
                }   break;
            default:
                System.out.println("Unknown command");
                break;
        }

        if (matched == true) {
            System.out.println("");
            System.out.println("Name: " + Defense_WaterBilling.name.get(position));
             System.out.println("Address: " + Defense_WaterBilling.address.get(position));
              System.out.println("Previous reading: " + prevMreading.get(position));
               System.out.println("Current reading: " + currMreading.get(position));
                 System.out.println("Current consumption: " + consumption.get(position));
                  System.out.println("Total payment due: " + Dues.get(position));
                    System.out.println("Promo: " + discount.get(position));
                     System.out.println("");

        }
    }

        static int exit() {
        return 0;
    }

}