using FastEndpoints;
using FrameworkBLL.DataSync;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.FastEndPoint;
using Microsoft.AspNetCore.Http;
using static GB5Shared.GB5Constant.Constant;

namespace FrameworkSL.Endpoints.DataSync
{
    public class ValidateImportFile : EndpointWithoutRequest<ResponseStandardDTO<object>>
    {
        private readonly IDataSyncImportBLL _bll;

        public ValidateImportFile(IDataSyncImportBLL bll) => _bll = bll;

        public override void Configure()
        {
            Post("/DataSync/ValidateImportFile");
            AllowAnonymous();
            AllowFileUploads();
        }

        public override async Task<ResponseStandardDTO<object>> ExecuteAsync(CancellationToken ct)
        {
            var loginHeader = HttpContext.Request.Headers["Login"].FirstOrDefault()
                ?? throw new InvalidOperationException("Login header is missing.");
            var login = System.Text.Json.JsonSerializer.Deserialize<LoginDTO>(loginHeader)
                ?? throw new InvalidOperationException("Login header contains invalid JSON.");

            var file = HttpContext.Request.Form.Files.FirstOrDefault()
                ?? throw new InvalidOperationException("No file uploaded.");

            try
            {
                await using var stream = file.OpenReadStream();
                var preview = await _bll.ValidateImportFileAsync(stream, login, ct).ConfigureAwait(false);
                return await GB5Shared.ResponseStandard.Response.CreateSuccessResponse(
                    preview, CacheKeyLevel.NOT_REQUIRED, login);
            }
            catch (Exception ex)
            {
                return await GB5Shared.ResponseStandard.Response.CreateExceptionError<string>(
                    ex, CacheKeyLevel.NOT_REQUIRED, login, ex.Message, 500);
            }
        }
    }
}