using AnalyticsBLL.BICatalog;
using FastEndpoints;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.FastEndPoint;
using static GB5Shared.GB5Constant.Constant;

namespace AnalyticsSL.EndPoints.BI
{
    // Computed-field picker for the config UI, scoped to one dataset — sibling of
    // GetDimensionsForDataset/GetMeasuresForDataset. See BICatalogBLL.GetComputedFieldsForDataset.
    public class GetComputedFieldsForDataset
        : BaseEndpoint<GetComputedFieldsForDataset.Params, ResponseStandardDTO<object>>
    {
        private readonly IBICatalogBLL _bll;

        public GetComputedFieldsForDataset(IBICatalogBLL bll) => _bll = bll;

        public override void Configure()
        {
            Get("/BI/GetComputedFieldsForDataset");
            AllowAnonymous();
        }

        public record Params(
            [property: QueryParam] int BICatalogId,
            [property: FromHeader] string Login
        );

        // "-computed" suffix is load-bearing, same reason GetMeasuresForDataset's own "-measures"
        // suffix is: BaseEndpoint's cache key has no route/endpoint-type component, so without a
        // distinguishing suffix this collides with GetDimensionsForDataset/GetMeasuresForDataset
        // for the same BICatalogId.
        protected override string? GetCacheKey(Params req, LoginDTO login)
            => KeyGenerator.KeyGeneration($"{req.BICatalogId}-computed", EntityConstant.OBJECTBICATALOG, CacheKeyLevel.CLIENT_LEVEL, login);

        protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(
            Params req, LoginDTO login, CancellationToken ct)
        {
            try
            {
                var result = await _bll.GetComputedFieldsForDataset(req.BICatalogId, login, ct).ConfigureAwait(false);
                return await GB5Shared.ResponseStandard.Response
                    .CreateSuccessResponse(result, CacheKeyLevel.CLIENT_LEVEL, login);
            }
            catch (Exception ex)
            {
                return await GB5Shared.ResponseStandard.Response
                    .CreateExceptionError<string>(ex, CacheKeyLevel.CLIENT_LEVEL, login, ex.Message, 500);
            }
        }
    }
}