using System;
using System.Runtime.Serialization;

namespace Tanshu.Accounts.Contracts
{
    [DataContract]
    public class InventoryBO
    {
        [DataMember]
        public Guid InventoryID { get; set; }
        [DataMember]
        public Guid VoucherID { get; set; }
        [DataMember]
        public Guid ProductID { get; set; }
        [DataMember]
        public Guid? ComplexProductID { get; set; }
        private decimal quantity;
        [DataMember]
        public decimal Quantity
        {
            get { return quantity; }
            set
            {
                quantity = value;
                if (amount != null)
                    CalculateAmount();
            }
        }
        private decimal rate;
        [DataMember]
        public decimal Rate
        {
            get { return rate; }
            set
            {
                rate = value;
                if (amount != null)
                    CalculateAmount();
            }
        }
        decimal tax;
        [DataMember]
        public decimal Tax
        {
            get { return tax; }
            set
            {
                tax = value; if (amount != null)
                    CalculateAmount();
            }
        }
        decimal discount;

        [DataMember]
        public decimal Discount
        {
            get { return discount; }
            set
            {
                discount = value; if (amount != null)
                    CalculateAmount();
            }
        }
        decimal? amount;
        
        [DataMember]
        public decimal Amount
        {
            get
            {
                if (!amount.HasValue)
                    CalculateAmount();
                return amount.Value;
            }
        }
        private void CalculateAmount()
        {
            amount = quantity * rate * (1 + tax) * (1 - discount);
        }
        [DataMember]
        public bool IsRateFinal { get; set; }
        [DataMember]
        public bool RateFinal
        {
            get { return IsRateFinal; }
        }
        [DataMember]
        public byte[] timestamp { get; set; }
    }
}