using System;
using System.Runtime.Serialization;

namespace Tanshu.Accounts.Contracts
{
    public class SalesBillItemBO
    {
        public Guid productID;
        public string Name { get; set; }
        private decimal price;
        private decimal quantity;
        private decimal discount;
        private decimal printed;

        public SalesBillItemBO()
        {
            quantity = 1;
            discount = 0;
            printed = 0;
            serviceCharge = 0.1M;
        }

        public decimal Price
        {
            get { return price; }
            set
            {
                if (value < 0)
                    throw new ArgumentException("Price has to be non-negative greater than zero.");
                else
                    price = value;
            }
        }
        public decimal Quantity
        {
            get { return quantity; }
            set
            {
                if (value <= 0)
                    throw new ArgumentException("Quantity has to be non-negative greater than zero.");
                quantity = value;

            }
        }

        public decimal Discount
        {
            get { return discount; }
            set
            {
                if (value < 0)
                    throw new ArgumentException("Discount has to be non-negative greater than or equal to zero.");
                else if (value > 1)
                    throw new ArgumentException("Discount has to be less than one.");
                else
                    discount = value;
            }
        }

        public decimal Tax { get; set; }

        private decimal serviceCharge;
        public decimal ServiceCharge
        {
            get { return serviceCharge; }
            set
            {
                if (value < 0)
                    throw new ArgumentException("Service Charge has to be non-negative greater than or equal to zero.");
                else if (value > 1)
                    throw new ArgumentException("Service Charge has to be less than one.");
                else
                    serviceCharge = value;
            }

        }

        #region Calculated Amounts
        public decimal ServiceChargeAmount
        {
            get
            {
                return quantity * price * (1 - discount) * serviceCharge;
            }
        }
        public decimal TaxAmount
        {
            get
            {
                return quantity * price * (1 - discount) * (1 + serviceCharge) * Tax;
            }
        }
        public decimal DiscountAmount
        {
            get
            {
                return quantity * price * discount;
            }
        }
        public decimal GrossAmount
        {
            get
            {
                return quantity * price * (1 - discount);
            }
        }
        public decimal Value
        {
            get
            {
                return price * quantity * (1 - discount) * (1 + serviceCharge) * (1 + Tax);
            }
        }

        #endregion
        public decimal Printed
        {
            get { return printed; }
            set
            {
                if (value < 0)
                    throw new ArgumentException("Printed has to be non-negative greater than or equal to zero.");
                else
                    printed = value;
            }
        }


        public decimal Additional
        {
            get
            {
                return quantity - printed;
            }
        }

        public bool isNew = true;

        public string Display
        {
            get
            {
                string output = string.Format("{0} @ Rs. {1:#.##}", Name, price);
                if (discount != 0)
                    output += string.Format(" - {0:#.##%}", discount);
                return output;
            }
        }
    }
}