/*
* Copyright (c) 2023 Vaughn Nugent
* 
* Library: VNLib
* Package: Emails.Transactional.Client
* File: TransactionalEmailConfig.cs 
*
* TransactionalEmailConfig.cs is part of Emails.Transactional.Client which is part of the larger 
* VNLib collection of libraries and utilities.
*
* Emails.Transactional.Client 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.Client 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.Client. If not, see http://www.gnu.org/licenses/.
*/

using System;
using System.Collections.Generic;

namespace Emails.Transactional.Client
{
    /// <summary>
    /// A global configuration object for transactional email clients
    /// </summary>
    public class TransactionalEmailConfig
    {
        /// <summary>
        /// An email id template/translation table for email template-ids
        /// </summary>
        public IReadOnlyDictionary<string, string> TemplateIdLookup { get; private set; }
     
        /// <summary>
        /// Sets the template lookup table for the current instance
        /// </summary>
        /// <param name="templates">The template-id lookup table to referrence</param>
        /// <returns>A referrence to the current object (fluent api)</returns>
        /// <exception cref="ArgumentNullException"></exception>
        public TransactionalEmailConfig WithTemplates(IReadOnlyDictionary<string, string> templates)
        {
            TemplateIdLookup = templates ?? throw new ArgumentNullException(nameof(templates));
            return this;
        }

        /// <summary>
        /// Gets a new <see cref="EmailTransactionRequest"/> from the specifed
        /// template name.
        /// </summary>
        /// <param name="templateName"></param>
        /// <returns></returns>
        /// <exception cref="KeyNotFoundException"></exception>
        /// <exception cref="ArgumentNullException"></exception>
        public EmailTransactionRequest GetTemplateRequest(string templateName)
        {
            //get the template from its template name
            string templateId = TemplateIdLookup[templateName];
            return new EmailTransactionRequest(templateId);
        }
    }
}