import java.util.Scanner;
import java.util.ArrayList;
import java.util.Random;

public class FinalProject {

    static ArrayList<String> names = new ArrayList<String> ();
    static ArrayList<String> addresses = new ArrayList<String> ();
    static ArrayList<Double> prevReadings = new ArrayList<Double> ();
    static ArrayList<Double> currReadings = new ArrayList<Double> ();
    static ArrayList<Double> paymentDues = new ArrayList<Double> ();
    static ArrayList<Integer> since = new ArrayList<Integer> ();
    static ArrayList<Double> consumptions = new ArrayList<Double> ();
    static ArrayList<String> discounts = new ArrayList<String> ();
    static Scanner input = new Scanner(System.in);

    public static void main(String[] args) {
        Random months = new Random();
        int currentMonth = months.nextInt((12 - 1) + 1)+1;
        int mainMenu = -1;
        final int month = currentMonth;
        System.out.println("Current month: " + currentMonth);
        while (mainMenu != 0) {
            menu();
            mainMenu = input.nextInt();
            input.nextLine();
            switch (mainMenu) {
                case 0:
                    exit();
                    break;
                case 1:
                    add(month);
                    break;
                case 2:
                    update();
                    break;
                case 3:
                    display();
                    break;
                case 4:
                    search();
                    break;
                case 8:
                    System.out.println("Current month: " + month);
                    break;
                default:
                    System.out.println("Out of range");
                    main(args);
                    break;
            }
        }
    }

        static void menu() {
        System.out.println("Water Billing System");
        System.out.println("[1] Add new account");
        System.out.println("[2] Update existing account");
        System.out.println("[3] Display all accounts");
        System.out.println("[4] Search for account");
        System.out.println("[0] Exit");
        System.out.print(">>> ");
    }

        static void add(int quarter) {
        Random rng = new Random();
        String name, address;
        double prev, curr, due = 0.0, sub = 0.0;
        int rate;
        System.out.println("Add new user!");
        System.out.println("Name: ");
        name = input.nextLine();
        names.add(name);
        System.out.println("Address: ");
        address = input.nextLine();
        addresses.add(address);
        System.out.println("Previous reading: ");
        prev = input.nextDouble();
        prevReadings.add(prev);
        System.out.println("Current reading: ");
        curr = input.nextDouble();
        currReadings.add(curr);
        System.out.println("[1] Residential");
        System.out.println("[2] Business");
        System.out.print(">>> ");
        rate = input.nextInt();
        double consumed = curr - prev;
        consumptions.add(consumed);
        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;
            }
        }
        int yearInService = rng.nextInt(26);
        since.add(yearInService);
        if (yearInService >= 15 && (quarter == 1 || quarter == 4 || quarter == 7 || quarter == 10)) {
            due = sub - (sub * (15/100));
            discounts.add("15% promo discount applied!");
        } else {
            due = sub;
            discounts.add("No promo discount appllied!");
        }
        paymentDues.add(due);
    }

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

        static void display() {
        System.out.println("All accounts!");
        for (int i = 0; i < names.size(); i++) {
            System.out.println("Name: " + names.get(i));
            System.out.println("Address: " + addresses.get(i));
            System.out.println("Previous reading: " + prevReadings.get(i));
            System.out.println("Current reading: " + currReadings.get(i));
            System.out.println("Current consumption: " + consumptions.get(i));
            System.out.println("Total payment due: " + paymentDues.get(i));

        }
    }

        static void search() {
        int position = 0, searchBy;
        String name, address;
        boolean matched = false;
        System.out.println("Search an account!");
        System.out.println("[1] By name");
        System.out.println("[2] By address");
        System.out.print(">>> ");
        searchBy = input.nextInt();
        input.nextLine();
        if (searchBy == 1) {
            System.out.print("Name: ");
            name = input.nextLine();
            for (String profile : names) {
                if (profile.contains(name)) {
                    matched = true;
                    position = names.indexOf(profile);
                    break;
                } else {
                    matched = false;
                }
            }
        } else if (searchBy == 2) {
            System.out.print("Address: ");
            address = input.nextLine();
            for (String profile : addresses) {
                if (profile.contains(address)) {
                    matched = true;
                    position = addresses.indexOf(profile);
                    break;
                } else {
                    matched = false;
                }
            }
        } else {
            System.out.println("Unknown command");
        }

        if (matched == true) {
            System.out.println(
                                "Name: " + names.get(position) +
                            "\nAddress: " + addresses.get(
position) +
                "\nCustomer since: " + (2022 -
 since.get(position)) +
                "\nPrevious reading: " + prevReadings.get(position) +
                "\nCurrent reading: " + currReadings.get(position) +
                "\nCurrent consumption: " + consumptions.get(position) +
                                "\nTotal payment due: " + paymentDues.get(position) +
                                "\nPromo: " + discounts.get(position) +
                "\n"
                                        );
        }
    }

        static int exit() {
        return 0;
    }

}