using System;
using Tanshu.Accounts.Entities;
using System.Collections.Generic;

namespace Tanshu.Accounts.Contracts
{
    public class BillItemValue
    {
        public int ProductID { get; set; }
        public string Name { get; set; }
        public decimal Price { get; set; }
        public decimal FullPrice { get; set; }
        public decimal Quantity { get; set; }
        private decimal _discount;
        public Product Product { get; private set; }

        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.");
                if (value > 1)
                    throw new ArgumentException("Discount has to be less than one.");
                _discount = value;
            }
        }

        public bool IsScTaxable { get; set; }

        public decimal ServiceTax { get; set; }
        public decimal ServiceTaxAmount
        {
            get
            {
                if (IsScTaxable)
                    return Quantity * Price * (1 - Discount) * (1 + ServiceCharge) * ServiceTax;
                return Quantity * Price * (1 - Discount) * ServiceTax;
            }
        }

        public decimal Vat { get; set; }
        public decimal VatAmount
        {
            get
            {
                if (IsScTaxable)
                    return Quantity * Price * (1 - Discount) * (1 + ServiceCharge) * Vat;
                return Quantity * Price * (1 - Discount) * Vat;
            }
        }

        public decimal ServiceCharge { get; set; }
        public decimal ServiceChargeAmount
        {
            get
            {
                return Quantity * Price * (1 - Discount) * ServiceCharge;
            }
        }

        public decimal DiscountAmount
        {
            get
            {
                return Quantity * Price * Discount;
            }
        }

        public decimal GrossAmount
        {
            get
            {
                return Quantity * Price * (1 - Discount);
            }
        }

        public bool Printed { get; set; }

        public decimal Value
        {
            get
            {
                if (IsScTaxable)
                    return Quantity * Price * (1 - Discount) * (1 + ServiceCharge) * (1 + ServiceTax + Vat);
                return Quantity * Price * (1 - Discount) * (1 + ServiceCharge + ServiceTax + Vat);
            }
        }

        public string Display
        {
            get
            {
                var output = string.Format("{0} @ Rs. {1:#.##}", Name, Price);
                if (_discount != 0)
                    output += string.Format(" - {0:#.##%}", _discount);
                if (Modifiers != null)
                    foreach (var item in Modifiers)
                        output += string.Format("\n\r  --  {0}", item.Name);
                return output;

                //if (Price == 0)
                //    return string.Format(" -- {0}", Name);
                //string output = string.Format("{0} @ Rs. {1:#.##}", Name, Price);
                //if (discount != 0)
                //    output += string.Format(" - {0:#.##%}", discount);
                //return output;
            }
        }
        public override string ToString()
        {
            return string.Format("{0} - {1}", ProductID, Name);
        }
        public IList<Modifier> Modifiers { get; set; }
        public BillItemValue(Product product)
        {
            Modifiers = new List<Modifier>();
            if (product != null)
            {
                Product = product;
                ProductID = product.ProductID;
                Name = product.Units == string.Empty ? product.Name : product.Name + " (" + product.Units + ")";
                Quantity = 1;
                Price = product.Price;
                FullPrice = product.FullPrice;
                IsScTaxable = product.IsScTaxable;
                ServiceTax = product.ServiceTax.Rate;
                Vat = product.Vat.Rate;
                ServiceCharge = product.ServiceCharge;
                Discount = 0;
                Printed = false;
            }
        }
        public BillItemValue()
        {
            Product = null;
            ProductID = 0;
            Discount = 0;
            Name = "== New Kot ==";
            Price = 0;
            FullPrice = 0;
            Printed = true;
            Quantity = 0;
            Vat = -1;
            ServiceCharge = 0;
        }

        public BillItemValue(Kot kot)
        {
            Product = null;
            ProductID = kot.KotID;
            Discount = 0;
            Name = string.Format("Kot: {0} / {1:dd-MMM HH:mm} ({2})", kot.Code, kot.Date, kot.User.Name);
            Price = 0;
            FullPrice = 0;
            Printed = true;
            Quantity = 0;
            Vat = -1;
            ServiceCharge = 0;
        }

    }
}