btcpayserver/BTCPayServer/Models/ServerViewModels/EmailsViewModel.cs

using System.ComponentModel.DataAnnotations;
using BTCPayServer.Services.Mails;
using BTCPayServer.Validation;

namespace BTCPayServer.Models.ServerViewModels
{
    public class EmailsViewModel
    {
        public EmailSettings Settings { get; set; }
        public EmailSettings FallbackSettings { get; set; }
        public bool PasswordSet { get; set; }
        
        [MailboxAddress]
        [Display(Name = "Test Email")]
        public string TestEmail { get; set; }

        public EmailsViewModel()
        {
        }

        public EmailsViewModel(EmailSettings settings, EmailSettings fallbackSettings = null)
        {
            Settings = settings;
            FallbackSettings = fallbackSettings;
            PasswordSet = !string.IsNullOrEmpty(settings?.Password);
        }
        
        public bool IsSetup() => Settings?.IsComplete() is true;
        public bool IsFallbackSetup() => FallbackSettings?.IsComplete() is true;
        public bool UsesFallback() => IsFallbackSetup() && Settings == FallbackSettings;
    }
}