using CSharpFunctionalExtensions;

using FluentValidation;

using System;

using System.Runtime.Serialization;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var value1 = "pidTDUP_D_GREEN3PB";

        Validate(value1, nameof(value1));

        var value2 = "pidTDUP_D_GREEN3P3PE";

        Validate(value2, nameof(value2));

        var value3 = "pidTDUP_D_GREEN3PB ";

        Validate(value3, nameof(value3));

        var value4 = " pidTDUP_D_GREEN3P3PE";

        Validate(value4, nameof(value4));

    }

    public static void Validate(string Value, string nameOfInput)

    {

        var result = IsValid(Value);

​

        if (result.IsFailure)

        {

            Console.WriteLine(nameOfInput);

            throw new ValidationException(result.Error);

        }

    }

    public static Result IsValid(string value)

    {

        if (value is null)

        {

            return Result.Failure("The Product ID value is NULL");

        }

​

        if (!value.StartsWith("pid"))

        {

            return Result.Failure("The pid identifier is not in the  productid");

        }

​

        Array validChannels = Enum.GetValues(typeof(ProductChannels));

​

        //Now let's see if it matches a channel

        foreach (var productChannel in validChannels)

        {

            if (value.EndsWith(CleanString(productChannel?.ToString() ?? string.Empty)))

            {

                return Result.Success();

            }

        }

​

        return Result.Failure($"The channel is not present in the productid - input: {value}");

    }

    private static string CleanString(string originalValue)

    {

        return originalValue.Replace("_", "");

    }

}

​

[DataContract]

    [Flags]

    public enum ProductChannels

    {

        [EnumMember(Value = "None")]

        None = 0,

        [EnumMember(Value = "1st_Party_ECommerce")]

        _1PE = 1,

        [EnumMember(Value = "1st_Party_B2B")]

        _1PR = 2,

        [EnumMember(Value = "3rd_Party_B2B")]

        _3PB = 4,

        [EnumMember(Value = "3rd_Party_Retail")]

        _3PR = 8,

        [EnumMember(Value = "3rd_Party_Ecommerce")]

        _3PE = 16,

        [EnumMember(Value = "Customer_Service")]

        _0CS = 32,

    }