using System;
using System.Runtime.Serialization;
using FluentNHibernate.Mapping;
using System.Collections.Generic;
using Tanshu.Accounts.Contracts;

namespace Tanshu.Accounts.Entities
{
    public class Inventory
    {
        public virtual int InventoryID { get; set; }
        public virtual Voucher Voucher { get; set; }
        public virtual Product Product { get; set; }

        private decimal quantity;
        public virtual decimal Quantity
        {
            get { return quantity; }
            set
            {
                quantity = value;
                if (amount != null)
                    CalculateAmount();
            }
        }

        private decimal rate;
        public virtual decimal Rate
        {
            get { return rate; }
            set
            {
                rate = value;
                if (amount != null)
                    CalculateAmount();
            }
        }

        decimal tax;
        public virtual decimal Tax
        {
            get { return tax; }
            set
            {
                tax = value;
                if (amount != null)
                    CalculateAmount();
            }
        }

        decimal discount;
        public virtual decimal Discount
        {
            get { return discount; }
            set
            {
                discount = value;
                if (amount != null)
                    CalculateAmount();
            }
        }

        private decimal serviceCharge;
        public virtual decimal ServiceCharge
        {
            get { return serviceCharge; }
            set
            {
                discount = value;
                if (amount != null)
                    CalculateAmount();
            }

        }

        [Cascade]
        public virtual IList<InventoryModifier> InventoryModifier { get; set; }

        decimal? amount;
        public virtual decimal Amount
        {
            get
            {
                if (!amount.HasValue)
                    CalculateAmount();
                return amount.Value;
            }
            set
            { }
        }

        //public decimal DiscountAmount
        //{
        //    get
        //    {
        //        return quantity * rate * (1 + tax) * (1 + serviceCharge) * discount;
        //    }
        //}
        protected void CalculateAmount()
        {
            amount = quantity * rate * (1 + tax) * (1 + serviceCharge) * (1 - discount);
        }
        public Inventory()
        {
            InventoryModifier = new List<InventoryModifier>();
        }
    }
}