using System.Text;
using GB5Shared.FileUpload;
using Microsoft.AspNetCore.Mvc;

namespace FrameworkSL.Controllers.FileUpload
{

    [ApiController]
    [Route("api/receive/ariba")]
    public class AribaFileReceive : ControllerBase
    {
        private readonly FileStorage _store;

        public AribaFileReceive(FileStorage store)
        {
            _store = store;
        }

        [HttpPost]
        public async Task<IActionResult> Receive()
        {
            var payloadId = Request.Headers["cXML-payloadID"].ToString();
            if (string.IsNullOrWhiteSpace(payloadId))
                payloadId = "no-payload-id";

            // MULTIPART (cXML + PDF)
            if (Request.ContentType != null &&
                Request.ContentType.StartsWith("multipart"))
            {
                var form = await Request.ReadFormAsync();

                // cXML PART
                var cxml = form["cxml"].ToString();
                if (!string.IsNullOrEmpty(cxml))
                {
                    var bytes = Encoding.UTF8.GetBytes(cxml);
                    await _store.SaveAsync(
                        new MemoryStream(bytes),
                        $"{payloadId}.xml",
                        "ariba"
                    );
                }

                // ATTACHMENT PART
                foreach (var file in form.Files)
                {
                    await _store.SaveAsync(
                        file.OpenReadStream(),
                        file.FileName,
                        "ariba"
                    );
                }
            }
            // RAW cXML
            else
            {
                using var reader = new StreamReader(Request.Body);
                var xml = await reader.ReadToEndAsync();

                var bytes = Encoding.UTF8.GetBytes(xml);
                await _store.SaveAsync(
                    new MemoryStream(bytes),
                    $"{payloadId}.xml",
                    "ariba"
                );
            }

            return Content(SuccessCxml(payloadId), "text/xml");
        }
        [NonAction]
        private string SuccessCxml(string payloadId) =>
    $@"<?xml version=""1.0"" encoding=""UTF-8""?>
<cXML payloadID=""{payloadId}"" timestamp=""{DateTime.UtcNow:o}"">
  <Response>
    <Status code=""200"" text=""OK"">Received</Status>
  </Response>
</cXML>";
    }
}