import java.util.Scanner;

import java.io.IOException;

import java.io.*;

import java.util.*;

import java.io.BufferedWriter;

import java.io.BufferedReader;

import java.io.FileWriter;

import java.io.FileReader;

public class BillingInfo

{

public String cus_id;

int billing_month;

int curr_reg_meter;

int curr_reg_peak;

String reading_date;

int cost_of_elec;

int sales_tax;

int fixed_charges;

int total_amnt;

String due_date;

String bill_paid_status;

String payment_date;

public BillingInfo(){}

public BillingInfo(String cus_id,int billing_m, int curr_reg_meter, int curr_reg_peak, String reading_date,

int cost_of_elec, int sales_tax, int fixed_charges, int total_amnt,

String due_date, String bill_paid_status, String payment_date) {

this.cus_id = cus_id;

this.billing_month=billing_m;

this.curr_reg_meter = curr_reg_meter;

this.curr_reg_peak = curr_reg_peak;

this.reading_date = reading_date;

this.cost_of_elec = cost_of_elec;

this.sales_tax = sales_tax;

this.fixed_charges = fixed_charges;

this.total_amnt = total_amnt;

this.due_date = due_date;

this.bill_paid_status = bill_paid_status;

this.payment_date = payment_date;

}

public void displayBillingInfo() {

System.out.println("Customer ID: " + cus_id);

System.out.println("Billing_Month is "+billing_month);

System.out.println("Current Regular Meter Reading: " + curr_reg_meter);

System.out.println("Current Peak Meter Reading: " + curr_reg_peak);

System.out.println("Reading Date: " + reading_date);

System.out.println("Cost of Electricity: " + cost_of_elec);

System.out.println("Sales Tax: " + sales_tax);

System.out.println("Fixed Charges: " + fixed_charges);

System.out.println("Total Amount: " + total_amnt);

System.out.println("Due Date: " + due_date);

System.out.println("Bill Paid Status: " + bill_paid_status);

System.out.println("Payment Date: " + payment_date);

System.out.println();

}

public static List<BillingInfo> loadBillingData(String filename) {

List<BillingInfo> billingList = new ArrayList<>();

try {

BufferedReader reader = new BufferedReader(new FileReader(filename));

String line;

// Read file line by line

while ((line = reader.readLine()) != null) {

// Remove any extra spaces and split line into parts by comma

String[] parts = line.split(",");

if (parts.length == 12) {

String cus_id = parts[0];

int billing_month=Integer.parseInt(parts[1]);

int curr_reg_meter = Integer.parseInt(parts[2]);

int curr_reg_peak = Integer.parseInt(parts[3]);

String reading_date = parts[4];

int cost_of_elec = Integer.parseInt(parts[5]);

int sales_tax = Integer.parseInt(parts[6]);

int fixed_charges = Integer.parseInt(parts[7]);

int total_amnt = Integer.parseInt(parts[8]);

String due_date = parts[9];

String bill_paid_status = parts[10];

String payment_date = parts[11].trim().equals("0") ? "" : parts[11].trim(); // Handle '0' as empty payment date

// Create new BillingInfo object and add to list

BillingInfo billingInfo = new BillingInfo(cus_id,billing_month, curr_reg_meter, curr_reg_peak, reading_date,

cost_of_elec, sales_tax, fixed_charges, total_amnt, due_date, bill_paid_status, payment_date);

billingList.add(billingInfo);

}

}

reader.close();

} catch (IOException e) {

e.printStackTrace();

}

return billingList;

}

public void Show_Bill_reports(List<BillingInfo> billingInfos)

{

int count1=0;

int count2=0;

for (BillingInfo billingInfo : billingInfos)

{

if(billingInfo.bill_paid_status.equals("paid"))

{

count1++;

}

else

{

count2++;

}

}

System.out.println("The amount of Paid Bills "+count1);

System.out.println("The amount of Unpaid Bills is "+count2);

}

public void view_bill(List<BillingInfo> billingInfos) {

Scanner scanner = new Scanner(System.in);

// Prompt user for customer ID

System.out.print("Enter Customer ID to view the bill: ");

String customerId = scanner.nextLine();

boolean billFound = false;

// Iterate through the list of billing info to find the matching customer ID

for (BillingInfo billingInfo : billingInfos) {

if (billingInfo.cus_id.equals(customerId)) {

// Display billing information

billingInfo.displayBillingInfo();

billFound = true;

break; // Exit the loop once the bill is found and displayed

}

}

if (!billFound) {

System.out.println("No bill found for Customer ID: " + customerId);

}

}

public void update_status(List<BillingInfo> billingInfos, List<Customer> cusInfos) {

Scanner scanner = new Scanner(System.in);

// Prompt user for Customer ID

System.out.print("Enter Customer ID to update bill status: ");

String customerId = scanner.nextLine();

boolean billingInfoFound = false;

boolean customerInfoFound = false;

// Find the corresponding BillingInfo and update the bill paid status

for (BillingInfo billingInfo : billingInfos) {

if (billingInfo.cus_id.equals(customerId)) {

billingInfoFound = true;

// Display current bill status

System.out.println("Current Bill Paid Status: " + billingInfo.bill_paid_status);

// Update bill status

if (billingInfo.bill_paid_status.equals("unpaid")) {

billingInfo.bill_paid_status = "paid"; // Update to paid

System.out.println("Bill status updated to 'paid'.");

// Now update the corresponding customer information if customer is domestic

for (Customer customer : cusInfos) {

if (customer.cus_id.equals(customerId)) {

customerInfoFound = true;

if (customer.Cus_type == 'D') { // Check if customer is domestic

// Prompt the user to enter the updated regular and peak hour units

System.out.print("Enter the updated regular hour units: ");

customer.reg_hour_units = scanner.nextInt();

if (customer.Meter_type.equalsIgnoreCase("3Phase")) {

System.out.print("Enter the updated peak hour units: ");

customer.peak_hour_units = scanner.nextInt();

}

System.out.println("Updated regular and peak hour units have been saved for the customer.");

}

break;

}

}

} else {

System.out.println("Bill is already marked as paid.");

}

break;

}

}

if (!billingInfoFound) {

System.out.println("No billing information found for Customer ID: " + customerId);

} else if (!customerInfoFound) {

System.out.println("No customer information found for Customer ID: " + customerId);

}

// Save updated billing information and customer information back to files

saveBillingData(billingInfos, "C:\\Users\\city\\Desktop\\java\\LESCO_Billing_System_in_Java\\data\\BillingInfo.txt");

saveCustomerData(cusInfos, "C:\\Users\\city\\Desktop\\java\\LESCO_Billing_System_in_Java\\data\\CustomerInfo.txt");

}

// Method to save updated billing information back to the file

// Method to save updated billing information back to the file

private void saveBillingData(List<BillingInfo> billingInfos, String filename) {

try {

BufferedWriter writer = new BufferedWriter(new FileWriter(filename));

// Write each billing info back to the file

for (BillingInfo billingInfo : billingInfos) {

writer.write(billingInfo.cus_id + "," + billingInfo.billing_month + "," + billingInfo.curr_reg_meter + "," + billingInfo.curr_reg_peak + ","

+ billingInfo.reading_date + "," + billingInfo.cost_of_elec + "," + billingInfo.sales_tax + ","

+ billingInfo.fixed_charges + "," + billingInfo.total_amnt + "," + billingInfo.due_date + ","

+ billingInfo.bill_paid_status + "," + (billingInfo.payment_date.equals("") ? "0" : billingInfo.payment_date));

writer.newLine();

}

writer.close();

System.out.println("Billing data updated and saved successfully.");

} catch (IOException e) {

e.printStackTrace();

System.out.println("Error updating billing data.");

}

}

// Method to save updated customer information back to the file

private void saveCustomerData(List<Customer> cusInfos, String filename) {

try {

BufferedWriter writer = new BufferedWriter(new FileWriter(filename));

// Write each customer info back to the file

for (Customer customer : cusInfos) {

writer.write(customer.cus_id + "," + customer.CNIC + "," + customer.Name + "," + customer.Address + ","

+ customer.Phone_no + "," + customer.Cus_type + "," + customer.Meter_type + "," + customer.connec_date + ","

+ customer.reg_hour_units + "," + customer.peak_hour_units);

writer.newLine();

}

writer.close();

System.out.println("Customer data updated and saved successfully.");

} catch (IOException e) {

e.printStackTrace();

System.out.println("Error updating customer data.");

}

}

}