monorepo/LCU.API.Internal.MemberPreferencesApi/LCU.Library.Internal.MemberPreferencesApiModels/Requests/MemberOptinRequest.cs

using LCU.Library.Internal.MemberPreferencesApiModels.Entities;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace LCU.Library.Internal.MemberPreferencesApiModels.Requests
{
    public class MemberOptinRequest : IValidatableObject
    {
        [Required] public string UserId { get; set; }
        public string Email { get; set; }
        [Required] public string Value { get; set; }
        [Required] public string LegalReference { get; set; }

        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            var results = new List<ValidationResult>();

            if (!string.Equals(Value, DeliveryPreference.Electronic, StringComparison.InvariantCultureIgnoreCase) &&
                !string.Equals(Value, DeliveryPreference.Paper, StringComparison.InvariantCultureIgnoreCase))
            {
                results.Add(new ValidationResult(
                    $"Invalid Option for Unified Opt-In Preference",
                    new[] { "Value" }));
            }

            if (string.Equals(Value, DeliveryPreference.Electronic, StringComparison.InvariantCultureIgnoreCase))
            {
                if (string.IsNullOrWhiteSpace(Email))
                {
                    results.Add(new ValidationResult("Email is required when Opting in", new[] { "Email" }));
                }
                else
                {
                    try
                    {
                        var unused = new System.Net.Mail.MailAddress(Email);
                    }
                    catch
                    {
                        results.Add(new ValidationResult("Invalid Email Format", new[] { "Email" }));
                    }
                }
            }

            return results;
        }

        public bool IsElectronicRequest()
        {
            return string.Equals(Value, DeliveryPreference.Electronic, StringComparison.InvariantCultureIgnoreCase);
        }

        public bool IsPaperRequest()
        {
            return string.Equals(Value, DeliveryPreference.Paper, StringComparison.InvariantCultureIgnoreCase);
        }
    }
}