/*
* Copyright (c) 2023 Vaughn Nugent
* 
* Library: VNLib
* Package: Emails.Transactional
* File: MailTransferAgent.cs 
*
* MailTransferAgent.cs is part of Emails.Transactional which is part of the larger 
* VNLib collection of libraries and utilities.
*
* Emails.Transactional is free software: you can redistribute it and/or modify 
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 2 of the License,
* or (at your option) any later version.
*
* Emails.Transactional is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License 
* along with Emails.Transactional. If not, see http://www.gnu.org/licenses/.
*/

using System;
using System.Threading;
using System.Threading.Tasks;

using VNLib.Plugins;
using VNLib.Plugins.Extensions.Loading;

namespace Emails.Transactional.Mta
{
    [ConfigurationName("mta")]
    internal sealed class MailTransferAgent: IMailTransferAgent
    {
        private readonly IMailTransferAgent _agent;

        public MailTransferAgent(PluginBase plugin, IConfigScope config)
        {
            //Recover config
            string? agentType = config.GetRequiredProperty("type", e => e.GetString())?.ToLowerInvariant();

            _agent = agentType switch
            {
                "smtp" => plugin.GetOrCreateSingleton<SmtpProvider>(),
                "resend" => plugin.GetOrCreateSingleton<ResendMta>(),
                _ => throw new NotSupportedException("The specified MTA type is not supported"),
            };
        }

        public Task<MtaResult> SendEmailAsync(EmailTransaction transaction, IEmailMessageData message, CancellationToken cancellation = default)
        {
            return _agent.SendEmailAsync(transaction, message, cancellation);
        }
    }
}