using FastEndpoints;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.FastEndPoint;
using IceImportBLL.IceImportUploadStagingService;
using IceImportSL.Parameters.Import;
using static GB5Shared.GB5Constant.Constant;

namespace IceImportSL.Endpoints.Import;

// Multipart file upload. Stores the source file via IIceImportUploadStagingService
// (IStorageProvider under the hood) and returns an opaque UploadToken the client passes to
// CommitImport — never the raw storage path. Modeled on
// FrameworkSL.Endpoints.DataSync.ImportFromFile / DMSSL.EndPoints.ESSDocument.UploadDocument.
public class UploadImportFile : BaseEndpoint<UploadImportFileParameters, ResponseStandardDTO<object>>
{
    private readonly IIceImportUploadStagingService _staging;

    public UploadImportFile(IIceImportUploadStagingService staging) => _staging = staging;

    public override void Configure()
    {
        Post("/IceImport/UploadImportFile");
        AllowAnonymous();
        //AllowFileUploads();
    }

    // Mutation endpoint — never cached.
    protected override string? GetCacheKey(UploadImportFileParameters req, LoginDTO login) => null;

    protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(
        UploadImportFileParameters req, LoginDTO login, 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 token = await _staging
                .StageAsync(stream, file.FileName, req.IceMapId, login, ct)
                .ConfigureAwait(false);

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