using HandlebarsDotNet;

using System;

​

public class Program

{

    public static void Main()

    {

        Handlebars.RegisterHelper("formatCurrency", (writer, context, parameters) =>

        {

            if (Decimal.TryParse(parameters[0].ToString(), out decimal amount))

            {

                writer.WriteSafeString(amount.ToString("C"));

            }

        });

​

        var source = @"

[

  { ""Title"": ""Receipt ID"", ""Value"": ""{{ReceiptId}}"" },

  { ""Title"": ""Total"", ""Value"": ""{{formatCurrency Amount}}"" },

{{#each ReceiptItems}}

  { ""Title"": ""Item #{{@index}} PLU"", ""Value"": ""{{PLU}}"" },

  { ""Title"": ""Item #{{@index}} Quantity"", ""Value"": ""{{Qty}} unit(s)"" }{{#unless @last}},{{/unless}}

{{/each}}

]";

​

        var template = Handlebars.Compile(source);

​

        var receipt = new Receipt

        {

            ReceiptId = Guid.NewGuid(),

            Amount = 123.45m,

            ReceiptItems = new ReceiptItem[] { new(){PLU = 123, Qty = 3.33m}, new(){PLU = 321, Qty = 1} },

        };

​

        var result = template(receipt);

        Console.WriteLine(result.Trim());

    }

    public class Receipt {

        public Guid ReceiptId { get; set;}

        public decimal Amount {get; set;}

        public string? SomeText {get; set;}

        public ReceiptItem[] ReceiptItems {get; set;} = Array.Empty<ReceiptItem>();

    }

    public class ReceiptItem 

    {

        public int PLU {get; set;}

        public decimal Qty {get; set;}

    }

}

​