public String meterType;

public int regularUnitPrice;

public Integer peakHourUnitPrice; // use Integer to handle null values

public int taxPercentage;

public int fixedCharges;

public static String filename;

Tax_tariff_info(String fn)

{

this.filename=fn;

}

Tax_tariff_info(){}

// Constructor

public Tax_tariff_info(String meterType, int regularUnitPrice, Integer peakHourUnitPrice,

int taxPercentage, int fixedCharges) {

this.meterType = meterType;

this.regularUnitPrice = regularUnitPrice;

this.peakHourUnitPrice = peakHourUnitPrice;

this.taxPercentage = taxPercentage;

this.fixedCharges = fixedCharges;

}

// Method to display the meter pricing info

public void displayInfo() {

System.out.println("Meter Type: " + meterType);

System.out.println("Regular Unit Price: " + regularUnitPrice);

System.out.println("Peak Hour Unit Price: " + (peakHourUnitPrice != null ? peakHourUnitPrice : "N/A"));

System.out.println("Tax Percentage: " + taxPercentage + "%");

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

System.out.println();

}

// Getters and Setters for updating fields

public String getMeterType() { return meterType; }

public void setMeterType(String meterType) { this.meterType = meterType; }

public int getRegularUnitPrice() { return regularUnitPrice; }

public void setRegularUnitPrice(int regularUnitPrice) { this.regularUnitPrice = regularUnitPrice; }

public Integer getPeakHourUnitPrice() { return peakHourUnitPrice; }

public void setPeakHourUnitPrice(Integer peakHourUnitPrice) { this.peakHourUnitPrice = peakHourUnitPrice; }

public int getTaxPercentage() { return taxPercentage; }

public void setTaxPercentage(int taxPercentage) { this.taxPercentage = taxPercentage; }

public int getFixedCharges() { return fixedCharges; }

public void setFixedCharges(int fixedCharges) { this.fixedCharges = fixedCharges; }

// Method to load pricing data from file

public static List<Tax_tariff_info> loadPricingData() {

List<Tax_tariff_info> pricingList = 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 == 5)

{

String meterType = parts[0].trim();

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

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

Integer peakHourUnitPrice = parts[2].trim().isEmpty() ? null : Integer.parseInt(parts[2].trim());

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

int fixedCharges = Integer.parseInt(parts[4].trim());

// Create a MeterPricingInfo object and add to list

Tax_tariff_info pricingInfo = new Tax_tariff_info(meterType, regularUnitPrice, peakHourUnitPrice, taxPercentage, fixedCharges);

pricingList.add(pricingInfo);

}

}

reader.close();

} catch (IOException e) {

e.printStackTrace();

}

return pricingList;

}

public static void savePricingData( List<Tax_tariff_info> pricingList) {

try {

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

for (Tax_tariff_info info : pricingList) {

writer.write(info.getMeterType() + "," + info.getRegularUnitPrice() + "," +

(info.getPeakHourUnitPrice() != null ? info.getPeakHourUnitPrice() : "") + "," +

info.getTaxPercentage() + "," + info.getFixedCharges());

writer.newLine();

}

writer.close();

} catch (IOException e) {

e.printStackTrace();

}

}

public void updateOrAddData(List<Tax_tariff_info> pricingList) {

Scanner scanner = new Scanner(System.in);

System.out.println("Would you like to update an existing entry or add a new one? (update/add): ");

String choice = scanner.nextLine().trim().toLowerCase();

if (choice.equals("update")) {

System.out.println("Enter meter type to update: ");

String meterType = scanner.nextLine().trim();

// Find the entry by meter type

for (Tax_tariff_info info : pricingList) {

if (info.getMeterType().equalsIgnoreCase(meterType)) {

System.out.println("Current data for " + meterType + ":");

info.displayInfo();

// Update values

System.out.println("Enter new Regular Unit Price: ");

int newRegularPrice = Integer.parseInt(scanner.nextLine().trim());

info.setRegularUnitPrice(newRegularPrice);

System.out.println("Enter new Peak Hour Unit Price (leave blank if N/A): ");

String peakInput = scanner.nextLine().trim();

Integer newPeakPrice = peakInput.isEmpty() ? null : Integer.parseInt(peakInput);

info.setPeakHourUnitPrice(newPeakPrice);

System.out.println("Enter new Tax Percentage: ");

int newTaxPercentage = Integer.parseInt(scanner.nextLine().trim());

info.setTaxPercentage(newTaxPercentage);

System.out.println("Enter new Fixed Charges: ");

int newFixedCharges = Integer.parseInt(scanner.nextLine().trim());

info.setFixedCharges(newFixedCharges);

savePricingData(pricingList);

System.out.println("Data updated successfully!");

return;

}

}

System.out.println("Meter type not found!");

} else if (choice.equals("add"))

{

if(pricingList.size()==4)

{

System.out.println("There are already four rows You should update them ");

return;

}

System.out.println("Enter new Meter Type: ");

String newMeterType = scanner.nextLine().trim();

System.out.println("Enter Regular Unit Price: ");

int newRegularPrice = Integer.parseInt(scanner.nextLine().trim());

System.out.println("Enter Peak Hour Unit Price (leave blank if N/A): ");

String peakInput = scanner.nextLine().trim();

Integer newPeakPrice = peakInput.isEmpty() ? null : Integer.parseInt(peakInput);

System.out.println("Enter Tax Percentage: ");

int newTaxPercentage = Integer.parseInt(scanner.nextLine().trim());

System.out.println("Enter Fixed Charges: ");

int newFixedCharges = Integer.parseInt(scanner.nextLine().trim());

// Add new entry to the list

Tax_tariff_info newInfo = new Tax_tariff_info(newMeterType, newRegularPrice, newPeakPrice, newTaxPercentage, newFixedCharges);

pricingList.add(newInfo);

savePricingData(pricingList);

System.out.println("New entry added successfully!");

} else {

System.out.println("Invalid choice! Please choose 'update' or 'add'.");

}

}