import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.time.LocalDate;

import java.time.format.DateTimeFormatter;

import java.time.temporal.ChronoUnit;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class NadraDB

{

public String CNIC;

public String issued_date;

public String expiry_date;

public static String filename;

public NadraDB(String filename1)

{

this.filename=filename1;

}

public NadraDB(){}

public NadraDB(String CNIC1,String iss_date,String exp_date)

{

this.CNIC=CNIC1;

this.issued_date=iss_date;

this.expiry_date=exp_date;

}

public static List<NadraDB> Load_NBData() {

List<NadraDB> NadraDB = new ArrayList<>();

try {

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

String line;

// Read file line by line

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

// Split the line by comma

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

if (parts.length == 3)

{

String CNIC = parts[0];

String iss_date = parts[1];

String exp_date=parts[2];

// Handle blank value for peak hour unit price (assign null if it's blank)

// Create a MeterPricingInfo object and add to list

NadraDB ndb = new NadraDB(CNIC,iss_date, exp_date);

NadraDB.add(ndb);

}

}

reader.close();

} catch (IOException e) {

e.printStackTrace();

}

return NadraDB;

}

public void displayInfo()

{

System.out.println("CNIC: "+CNIC);

System.out.print("Issued Date: "+issued_date+" ");

System.out.print("Expiry Date: "+expiry_date);

System.out.println();

}

public static void Check_expiry(List<NadraDB> nadraList, List<Customer> customers) {

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");

LocalDate currentDate = LocalDate.now(); // Get the current date

for (Customer customer : customers) {

String customerCNIC = String.valueOf(customer.CNIC); // CNIC from customer

for (NadraDB ndb : nadraList) {

String nadraCNIC = ndb.CNIC; // CNIC from NADRA database

// If CNIC matches

if (customerCNIC.equals(nadraCNIC)) {

// Parse the expiry date from the NADRA database

LocalDate expiryDate = LocalDate.parse(ndb.expiry_date, formatter);

// Calculate the number of days between the current date and the expiry date

long daysUntilExpiry = ChronoUnit.DAYS.between(currentDate, expiryDate);

// Check if the expiry is within the next 30 days

if (daysUntilExpiry > 0 && daysUntilExpiry <= 30) {

System.out.println("Customer ID: " + customer.cus_id + " has a CNIC expiring in " + daysUntilExpiry + " days.");

}

}

}

}

}

public void update_expiry_date(List<NadraDB> nadraList, List<Customer> customers) {

Scanner scanner = new Scanner(System.in);

// Get input from the user

System.out.print("Enter your CNIC number: ");

String inputCNIC = scanner.nextLine();

System.out.print("Enter your Customer number: ");

String inputCustomerID = scanner.nextLine();

// scanner.nextLine(); // Consume the newline

boolean foundCustomer = false;

boolean foundCNIC = false;

// Find the customer with matching CNIC and customer number

for (Customer customer : customers) {

if (customer.CNIC.equals(inputCNIC) && customer.cus_id.equals( inputCustomerID)){

foundCustomer = true;

// Now search for this CNIC in the Nadra database

for (NadraDB ndb : nadraList) {

if (ndb.CNIC.equals(inputCNIC)) {

foundCNIC = true;

// Prompt the user to enter a new expiry date

System.out.print("Enter the new expiry date (dd/MM/yyyy): ");

String newExpiryDate = scanner.nextLine();

// Validate date format

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");

try {

LocalDate parsedDate = LocalDate.parse(newExpiryDate, formatter);

// Update the expiry date in the NadraDB object

ndb.expiry_date = newExpiryDate;

System.out.println("Expiry date updated successfully for CNIC: " + inputCNIC);

// Save the updated data back to the file

saveUpdatedDataToFile(nadraList);

} catch (Exception e) {

System.out.println("Invalid date format. Please enter the date in dd/MM/yyyy format.");

}

break;

}

}

break;

}

}

if (!foundCustomer) {

System.out.println("Customer number or CNIC not found.");

} else if (!foundCNIC) {

System.out.println("CNIC not found in Nadra database.");

}

}

// Method to save the updated data back to the file

public void saveUpdatedDataToFile(List<NadraDB> nadraList) {

try {

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

// Write each entry back to the file

for (NadraDB ndb : nadraList) {

writer.write(ndb.CNIC + "," + ndb.issued_date + "," + ndb.expiry_date);

writer.newLine();

}

writer.close();

System.out.println("Data saved successfully.");

} catch (IOException e) {

System.out.println("Error saving data to file.");

e.printStackTrace();

}

}

}