package model;

import java.util.Objects;

/**

* Represents a product in the POS system.

* Contains product information including pricing, inventory, and

* categorization.

*/

public class Product {

// Instance variables

private String productId;

private String name;

private String category;

private double originalPrice;

private double salePrice;

private double priceByUnit;

private double priceByCarton;

private int quantity;

private int soldQuantity;

// Constants

private static final double MIN_PRICE = 0.0;

private static final int MIN_QUANTITY = 0;

/**

* Default constructor

*/

public Product() {

this.soldQuantity = 0;

}

/**

* Constructor with all product details

*

* @param productId unique identifier for the product

* @param name product name

* @param category product category

* @param originalPrice original price of the product

* @param salePrice sale price of the product

* @param priceByUnit price per unit

* @param priceByCarton price per carton

* @param quantity available quantity in stock

*/

public Product(String productId, String name, String category,

double originalPrice, double salePrice, double priceByUnit,

double priceByCarton, int quantity) {

this.productId = productId;

this.name = name;

this.category = category;

this.originalPrice = validatePrice(originalPrice, "Original price");

this.salePrice = validatePrice(salePrice, "Sale price");

this.priceByUnit = validatePrice(priceByUnit, "Price by unit");

this.priceByCarton = validatePrice(priceByCarton, "Price by carton");

this.quantity = validateQuantity(quantity);

this.soldQuantity = 0;

}

/**

* Constructor for product with minimal information

*

* @param productId unique identifier for the product

* @param quantity available quantity in stock

*/

public Product(String productId, int quantity) {

this.productId = productId;

this.quantity = validateQuantity(quantity);

this.soldQuantity = 0;

}

/**

* Constructor for product with basic information

*

* @param productId unique identifier for the product

* @param name product name

* @param quantity available quantity in stock

*/

public Product(String productId, String name, int quantity) {

this.productId = productId;

this.name = name;

this.quantity = validateQuantity(quantity);

this.soldQuantity = 0;

}

// Validation methods

private double validatePrice(double price, String fieldName) {

if (price < MIN_PRICE) {

throw new IllegalArgumentException(fieldName + " cannot be negative");

}

return price;

}

private int validateQuantity(int quantity) {

if (quantity < MIN_QUANTITY) {

throw new IllegalArgumentException("Quantity cannot be negative");

}

return quantity;

}

// Business logic methods

/**

* Check if product is in stock

*

* @return true if quantity > 0, false otherwise

*/

public boolean isInStock() {

return quantity > 0;

}

/**

* Check if product is low in stock (less than 10 units)

*

* @return true if quantity < 10, false otherwise

*/

public boolean isLowStock() {

return quantity < 10;

}

/**

* Calculate the profit margin percentage

*

* @return profit margin as percentage, or 0 if original price is 0

*/

public double getProfitMargin() {

if (originalPrice <= 0) {

return 0.0;

}

return ((salePrice - originalPrice) / originalPrice) * 100;

}

/**

* Get the total value of current stock

*

* @return total value (quantity * sale price)

*/

public double getStockValue() {

return quantity * salePrice;

}

/**

* Update sold quantity for this product

*

* @param soldQuantity quantity sold

*/

public void setSoldQuantity(int soldQuantity) {

this.soldQuantity = validateQuantity(soldQuantity);

}

/**

* Get the quantity sold

*

* @return sold quantity

*/

public int getSoldQuantity() {

return soldQuantity;

}

// Static factory method for parsing from string

/**

* Parse a Product from a comma-separated string

*

* @param line comma-separated string containing product data

* @return Product object

* @throws IllegalArgumentException if the string format is invalid

*/

public static Product parse(String line) {

try {

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

if (parts.length != 8) {

throw new IllegalArgumentException(

"Invalid product data format. Expected 8 fields, got " + parts.length);

}

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

String name = parts[1].trim();

String category = parts[2].trim();

double originalPrice = Double.parseDouble(parts[3].trim());

double salePrice = Double.parseDouble(parts[4].trim());

double priceByUnit = Double.parseDouble(parts[5].trim());

double priceByCarton = Double.parseDouble(parts[6].trim());

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

return new Product(productId, name, category, originalPrice, salePrice, priceByUnit, priceByCarton,

quantity);

} catch (NumberFormatException e) {

throw new IllegalArgumentException("Failed to parse numeric values in product data: " + line, e);

} catch (Exception e) {

throw new IllegalArgumentException("Failed to parse product: " + line, e);

}

}

// Getters and Setters

public String getProductId() {

return productId;

}

public void setProductId(String productId) {

this.productId = productId;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getCategory() {

return category;

}

public void setCategory(String category) {

this.category = category;

}

public double getOriginalPrice() {

return originalPrice;

}

public void setOriginalPrice(double originalPrice) {

this.originalPrice = validatePrice(originalPrice, "Original price");

}

public double getSalePrice() {

return salePrice;

}

public void setSalePrice(double salePrice) {

this.salePrice = validatePrice(salePrice, "Sale price");

}

public double getPriceByUnit() {

return priceByUnit;

}

public void setPriceByUnit(double priceByUnit) {

this.priceByUnit = validatePrice(priceByUnit, "Price by unit");

}

public double getPriceByCarton() {

return priceByCarton;

}

public void setPriceByCarton(double priceByCarton) {

this.priceByCarton = validatePrice(priceByCarton, "Price by carton");

}

public int getQuantity() {

return quantity;

}

public void setQuantity(int quantity) {

this.quantity = validateQuantity(quantity);

}

// Object methods

@Override

public String toString() {

return String.join(",",

productId != null ? productId : "",

name != null ? name : "",

category != null ? category : "",

String.valueOf(originalPrice),

String.valueOf(salePrice),

String.valueOf(priceByUnit),

String.valueOf(priceByCarton),

String.valueOf(quantity));

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null || getClass() != obj.getClass())

return false;

Product product = (Product) obj;

return Objects.equals(productId, product.productId);

}

@Override

public int hashCode() {

return Objects.hash(productId);

}

}