// ***********************************************************************
// Assembly         : FCS.Lib.Vies
// Author           : FH
// Created          : 04-01-2022
//
// Last Modified By : FH
// Last Modified On : 04-01-2022
// ***********************************************************************
// <copyright file="ViesHttpRequest.cs" company="">
//    Copyright (C) 2022 FCS Frede's Computer Services.
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU Affero General Public License as
//    published by the Free Software Foundation, either version 3 of the
//    License, or (at your option) any later version.
//
//    This program 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 Affero General Public License for more details.
//
//    You should have received a copy of the GNU Affero General Public License
//    along with this program.  If not, see [https://www.gnu.org/licenses]
// </copyright>
// <summary></summary>
// ***********************************************************************
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

namespace FCS.Lib.Vies
{
    /// <summary>
    /// http request to vies registrar
    /// </summary>
    public class ViesHttpRequest
    {
        /// <summary>
        /// Async http request to vies registrar
        /// </summary>
        /// <param name="endpoint"></param>
        /// <param name="countryCode"></param>
        /// <param name="vatNumber"></param>
        /// <param name="userAgent"></param>
        /// <returns>Vies Response View model</returns>
        /// <see cref="ViesResponseView"/>
        /// <remarks>Service http://ec.europa.eu/taxation_customs/vies/services/checkVatService</remarks>
        public async Task<ViesResponseView> GetResponseAsync(string endpoint, string countryCode, string vatNumber, string userAgent)
        {

            var xml = new StringBuilder();
            xml.Append($"<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:urn=\"urn:ec.europa.eu:taxud:vies:services:checkVat:types\">");
            xml.Append($"<soapenv:Header/>");
            xml.Append($"<soapenv:Body>");
            xml.Append($"<urn:checkVat>");
            xml.Append($"<urn:countryCode>{countryCode.ToUpperInvariant()}</urn:countryCode>");
            xml.Append($"<urn:vatNumber>{vatNumber}</urn:vatNumber>");
            xml.Append($"</urn:checkVat>");
            xml.Append($"</soapenv:Body>");
            xml.Append($"</soapenv:Envelope>");

            using var content = new StringContent(xml.ToString(), Encoding.UTF8, "text/xml");

            using var client = new HttpClient();
            using var viesRequest = new HttpRequestMessage(HttpMethod.Post, endpoint);
            viesRequest.Headers.Add("SOAPAction", "");
            viesRequest.Headers.Add("User-Agent", userAgent);
            viesRequest.Content = content;
            var response = await client.SendAsync(viesRequest).ConfigureAwait(true);
            var xmlResult = await response.Content.ReadAsStringAsync().ConfigureAwait(true);

            return new ViesResponseView
            {
                Code = response.StatusCode,
                IsSuccessStatusCode = response.IsSuccessStatusCode,
                Message = xmlResult
            };
        }
    }
}