import java.util.Scanner;
import java.util.*;

import java.util.*;
public class Main
{
    static final int MAX_BILL= 100;
    static Bill[] bills = new Bill[MAX_BILL];
    static int billCount = 0;
    static Scanner scanner = new Scanner(System.in);
    public static void main(String[] args)
    {
            int choice;
            boolean flag = true;
            while(flag)
                {
                    System.out.println("Bill Management System");
                    System.out.println("[1]Add Bill");
                    System.out.println("[2]Update amount details");
                    System.out.println("[3]Delete Bill details");
                    System.out.println("[4]Print all details ");
                    System.out.println("[5]Exit");

                    try {
                        choice = scanner.nextInt();
                    } catch (InputMismatchException e) {
                        System.out.println("Invalid input. Please enter a number.");
                        choice = 0; // Reset choice to avoid errors
                        scanner.nextLine(); // Consume the newline character
                    }

                    switch (choice) {
                        case 1:
                            addBill();
                            break;
                        case 2:
                            updateBillAmount(billCount);
                            break;
                        case 3:
                            deleteBill();
                            break;
                        case 4:
                           selectAllBill(billCount);
                           break;
                        case 5:
                            System.out.println("Thank you");
                            flag=false;
                            break;
                        default:
                            System.out.println("Invalid choice. Please try again.");
                    }

                }



    }

        public static void addBill()
        {
            if (billCount < MAX_BILL) {
                System.out.print("Enter Consumer No: ");
                int consumerNo = scanner.nextInt();scanner.nextLine();
                System.out.print("Enter Due Amount: ");
                double dueAmount = scanner.nextDouble();scanner.nextLine();
                System.out.print("Enter Payable Amount: ");
                double payableAmount = scanner.nextDouble();


                Bill bill = new Bill(consumerNo,dueAmount,payableAmount);
                bills[billCount++] = bill;

                System.out.println("Bill Registration is successful");
            } else {
                System.out.println("Maximum number of bills reached. Cannot add more.");
            }
        }


        public static void deleteBill()
        {
            System.out.print("Enter Consumer No to delete: ");
            int consumerNoToDelete = scanner.nextInt();
            scanner.nextLine(); // Consume the newline character

            for (int i = 0; i < billCount; i++) {
                if (bills[i].getConsumerNo() == consumerNoToDelete) {
                    // Shift
                    for (int j = i; j < billCount - 1; j++) {
                        bills[j] = bills[j + 1];
                    }
                    bills[--billCount] = null; // Remove the last element
                    System.out.println("Customer details are deleted");
                    return;
                }
            }

            System.out.println("Customer not found with the given Consumer ID");
        }

        
        public static void updateBillAmount (int billCount)
        {
            System.out.print("Enter Consumer No to update amount: ");
            int consumerNoToUpdate = scanner.nextInt();
            scanner.nextLine();
            System.out.print("Enter new Due Amount: ");
            double newDueAmount = scanner.nextDouble(); 
            System.out.print("Enter new Payable Amount: ");
            double newPayableAmount = scanner.nextDouble(); 

            for (int i = 0; i < billCount; i++) {
                if (bills[i].getConsumerNo() == consumerNoToUpdate) {
                    bills[i].setDueAmount(newDueAmount);
                    bills[i].setPayableAmount(newPayableAmount);
                    System.out.println("Customer details are updated successfully");
                    return;
                }
            }

            System.out.println("Customer not found");
        }
        
    public static void selectAllBill(int billCount) 
    {
        System.out.println("All bill details:");
        for (int i = 0; i < billCount; i++) {
            if(bills[i]!=null)
            {
            System.out.println("Complain type: "+ bills[i]. getConsumerNo());
            System.out.println("Complain category: "+ bills[i].getDueAmount());
            System.out.println("Landmark: "+ bills[i].getPayableAmount());
            System.out.println();
            System.out.println();
            
            }
        }
    }

         
}


public class Bill {
    private int consumerNo;
    private double dueAmount;
    private double payableAmount;

    public Bill(int consumerNo, double dueAmount, double payableAmount) {
        this.consumerNo = consumerNo;
        this.dueAmount = dueAmount;
        this.payableAmount = payableAmount;
    }

    public int getConsumerNo() {
        return consumerNo;
    }

    public void setConsumerNo(int consumerNo) {
        this.consumerNo = consumerNo;
    }

    public double getDueAmount() {
        return dueAmount;
    }

    public void setDueAmount(double dueAmount) {
        this.dueAmount = dueAmount;
    }

    public double getPayableAmount() {
        return payableAmount;
    }

    public void setPayableAmount(double payableAmount) {
        this.payableAmount = payableAmount;
    }
}