using System;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var orderItemString = "[    {       \"reference\": \"0199999026\",      \"name\": \"Tygprover Kokt ull 100% ull hel karta\",        \"quantity\": 1,        \"unit\": \"pcs\",      \"unitPrice\": 1600,        \"taxRate\": 2500,      \"taxAmount\": 400,     \"grossTotalAmount\": 2000,     \"netTotalAmount\": 1600    },  {       \"reference\": \"0105011025\",      \"name\": \"Tunn vadmal 205/03 mellangrå\",     \"quantity\": 2,        \"unit\": \"pcs\",      \"unitPrice\": 13200,       \"taxRate\": 2500,      \"taxAmount\": 6600,        \"grossTotalAmount\": 33000,        \"netTotalAmount\": 26400   },  {       \"reference\": \"0100000860\",      \"name\": \"Tunn vadmal 231/01 mörk olivgrön\",     \"quantity\": 1,        \"unit\": \"pcs\",      \"unitPrice\": 13200,       \"taxRate\": 2500,      \"taxAmount\": 3300,        \"grossTotalAmount\": 16500,        \"netTotalAmount\": 13200   },  {       \"reference\": \"0100000398\",      \"name\": \"Tunn vadmal 273/02 lila\",      \"quantity\": 0.8,      \"unit\": \"pcs\",      \"unitPrice\": 13200,       \"taxRate\": 2500,      \"taxAmount\": 2640,        \"grossTotalAmount\": 13200,        \"netTotalAmount\": 10560   },  {       \"reference\": \"0100000374\",      \"name\": \"Tunn vadmal 217/01 gråblå\",        \"quantity\": 0.8,      \"unit\": \"pcs\",      \"unitPrice\": 13200,       \"taxRate\": 2500,      \"taxAmount\": 2640,        \"grossTotalAmount\": 13200,        \"netTotalAmount\": 10560   },  {       \"reference\": \"*\",       \"name\": \"Fraktavgift\",      \"quantity\": 1,        \"unit\": \"pcs\",      \"unitPrice\": 4720,        \"taxRate\": 2500,      \"taxAmount\": 1180,        \"grossTotalAmount\": 5900,     \"netTotalAmount\": 4720    }]";

        var paymentAmount = 83800;

        var orderItems = JsonConvert.DeserializeObject<List<OrderItem>>(orderItemString);

        Console.WriteLine("Number of order items : " + orderItems.Count());

        Console.WriteLine();

        Validate(paymentAmount, orderItems);

        Console.WriteLine();

        /*  

        List<OrderItem> orderItems = new List<OrderItem> {

            new OrderItem {

                UnitPrice = 132.0m,

                Quantity = 1,

                TaxRate = 25.0m,

                TaxAmount = 33.00m,

                NetTotalAmount =    132.00m,

                GrossTotalAmount = 165.00m

            },

            new OrderItem {

                UnitPrice = 132.0m,

                Quantity = 2,

                TaxRate = 25.0m,

                TaxAmount = 66.00m,

                NetTotalAmount =    264.00m,

                GrossTotalAmount = 330.00m

            },

            new OrderItem {

                UnitPrice = 132.0m,

                Quantity = 0.8m,

                TaxRate = 25.0m,

                TaxAmount = 26.40m,

                NetTotalAmount =    105.60m,

                GrossTotalAmount = 132.00m

            }

        };

        */

         int itemIndex  = 1;

         foreach (var orderItem in orderItems)

         {          

              var vatPerUnit = Math.Round(orderItem.TaxAmount / orderItem.Quantity, 3);

              //if (orderItem.Quantity > 0 && orderItem.Quantity < 1)

              //{

                //  vatPerUnit = Math.Round(1 / orderItem.Quantity) * orderItem.TaxAmount;

              //}

             /*

             List<OrderItemAfterPay> orderItemsAfterPay= new List<OrderItemAfterPay>();

             orderItemsAfterPay.Add(new OrderItemAfterPay(

                 orderItem.UnitPrice,

                 orderItem.UnitPrice + vatPerUnit,

                 orderItem.Quantity,

                 orderItem.TaxRate,

                 vatPerUnit

             ));

             */

             Console.WriteLine("--------------------------------Order item - "+itemIndex+"---------------------------------------");

             Console.WriteLine();

             Console.WriteLine("Name:                              "+ orderItem.Name);

             Console.WriteLine("Reference                          "+ orderItem.Reference);          

             Console.WriteLine();

             Console.WriteLine("Net amount per unit:               "+ orderItem.UnitPrice);

             Console.WriteLine("Gorss amount per unit:             "+ (orderItem.UnitPrice + vatPerUnit));

             Console.WriteLine("Quantity:                          "+ orderItem.Quantity);

             Console.WriteLine("Tax Rate:                          "+ orderItem.TaxRate);

             Console.WriteLine("Tax amount:                        "+ vatPerUnit);

             Console.WriteLine();

             itemIndex++;

         }  

             Console.WriteLine("===========================================================================");

             Console.WriteLine();

             Console.WriteLine("Total Net amount:                  "+ orderItems.Sum(x => x.NetTotalAmount));

             Console.WriteLine("Total Gross amount:                "+ orderItems.Sum(y => y.GrossTotalAmount));

             Console.WriteLine("Order amount:                      "+ paymentAmount);

             Console.WriteLine();

    }

    public class OrderItem {

        public string Name {get; set;}

        public string Reference {get; set;}

        public decimal UnitPrice {get; set;}

        public decimal Quantity {get; set;}

        public decimal TaxRate {get; set;}

        public decimal TaxAmount {get; set;}

        public decimal NetTotalAmount {get; set;}

        public decimal GrossTotalAmount {get; set;}

    }

    private static void Validate(decimal paymentAmount,List<OrderItem> orderItems)

    {

        int itemIndex  = 1;

        foreach(var orderItem in orderItems)

        {   

            if(orderItem.TaxRate <=0 || orderItem.TaxAmount <=0)

            {               

                Console.WriteLine("Tax details missing for item : " + itemIndex);

            }

​

            if(orderItem.NetTotalAmount != (orderItem.Quantity * orderItem.UnitPrice))

            {

                Console.WriteLine("Mismatch in NetTotalAmount calculation for item : " + itemIndex);

            }

​

            if(orderItem.GrossTotalAmount != orderItem.NetTotalAmount + orderItem.TaxAmount)

            {

                Console.WriteLine("Mismatch in NetTotalAmount calculation for item : " + itemIndex);

            }           

            itemIndex++;

        }

        if ( orderItems.Sum(x => x.GrossTotalAmount) != paymentAmount)

        {

            Console.WriteLine("Mismatch in order total gross vs order amount.");

        }

    }

    /*

    public class OrderItemAfterPay {

        public OrderItemAfterPay(decimal netUnitAmt, decimal grossUnitAmt, decimal qty, decimal taxRate, decimal vatUnitAmt)

        {

            NetUnitAmt = netUnitAmt;

            GrossUnitAmt = grossUnitAmt;

            Qty = qty;

            TaxRate = taxRate;

            VatUnitAmt = vatUnitAmt;

        }

        public decimal NetUnitAmt {get; set;}

        public decimal GrossUnitAmt {get; set;}

        public decimal Qty {get; set;}

        public decimal TaxRate {get; set;}

        public decimal VatUnitAmt {get; set;}

    }

    */

}