using DMSBLL.ESSDocument;
using FastEndpoints;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.FastEndPoint;
using static GB5Shared.GB5Constant.Constant;

namespace DMSSL.EndPoints.ESSDocument
{
    /// <summary>
    /// Receives a multipart/form-data file upload from an employee.
    /// Employee identity is always resolved from the Login header — never from form data.
    /// Max upload size enforced at Kestrel level (configure in Program.cs if needed).
    /// </summary>
    public class UploadDocument : BaseEndpoint<UploadDocument.UploadDocumentParameters, ResponseStandardDTO<object>>
    {
        public readonly IESSDocumentBLL _ESSDocumentBLL;

        public UploadDocument(IESSDocumentBLL essDocumentBLL)
        {
            _ESSDocumentBLL = essDocumentBLL;
        }

        public record UploadDocumentParameters(
            [property: FromHeader] string Login,
            [property: QueryParam] int DocumentTypeId,
            [property: QueryParam] int? PeriodYear,
            [property: QueryParam] int? PeriodMonth,
            [property: QueryParam] string? DisplayName
        );

        public override void Configure()
        {
            Post("/ESSDocument/UploadDocument");
            AllowAnonymous();
            AllowFileUploads();
        }

        protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(
            UploadDocumentParameters req, LoginDTO loginDTO, CancellationToken ct)
        {
            try
            {
                var file = HttpContext.Request.Form.Files.FirstOrDefault();
                if (file is null || file.Length == 0)
                    throw new ArgumentException("No file provided or file is empty.");

                await using var stream = file.OpenReadStream();

                var result = await _ESSDocumentBLL.UploadDocument(
                    stream,
                    file.FileName,
                    file.ContentType,
                    file.Length,
                    req.DocumentTypeId,
                    req.PeriodYear,
                    req.PeriodMonth,
                    req.DisplayName,
                    loginDTO,
                    ct);

                return await GB5Shared.ResponseStandard.Response.CreateSuccessResponse(
                    result, CacheKeyLevel.NOT_REQUIRED, loginDTO);
            }
            catch (Exception ex)
            {
                return await GB5Shared.ResponseStandard.Response.CreateExceptionError<string>(
                    ex, CacheKeyLevel.NOT_REQUIRED, loginDTO, ex.Message, 500);
            }
        }
    }
}