oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/Bill.java


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package lk.ac.pdn.ceit.pos.entities;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

public class Bill {

    private List<LineItem> lineItems = new ArrayList<>();
    private Cashier cashier;

    private int id;
    private BigDecimal total = new BigDecimal("0.00");
    private BigDecimal tax;
    private BigDecimal cashByCustomer;
    private BigDecimal balance;

    public Bill() {
    }

    public Cashier getCashier() {
        return cashier;
    }

    public void setCashier(Cashier cashier) {
        this.cashier = cashier;
    }

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }

    public BigDecimal getTotal() {
        return total;
    }

    public BigDecimal getTax() {
        return tax;
    }

    public void setTax(BigDecimal tax) {
        this.tax = tax;
    }

    public BigDecimal getCashByCustomer() {
        return cashByCustomer;
    }
    public void setCashByCustomer(BigDecimal cashByCustomer) {
        this.cashByCustomer = cashByCustomer;
    }

    public BigDecimal getBalance() {
        return balance;
    }

    @Override
    public String toString() {
        return "Bill [id=" + id + ", total=" + total + ", tax=" + tax + ", cashByCustomer=" + cashByCustomer
                + ", balance=" + balance + "]";
    }

    public void addLineItem(LineItem lineItem) {
        lineItems.add(lineItem);

        // Update total
        for (LineItem _lineItem : lineItems) {
            total = total.add(_lineItem.getUnitPrice().multiply(BigDecimal.valueOf(_lineItem.getQuantity())));
        }
    }

    public List<LineItem> getLineItems() {
        // TODO: Do a deep copy and return to avoid external modification of line items.
        // We return an immutable copy to avoid external world adding LineItems.
        return List.copyOf(lineItems);
    }
}