using System.Text.Json;
using FastEndpoints;
using FrameworkBLL.EntityViewer;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.FastEndPoint;
using static GB5Shared.GB5Constant.Constant;

namespace FrameworkSL.Endpoints.EntityViewer
{
    // The Entity Viewer's real read: resolve the Active LayoutSchema JSON for
    // an entity — a TenantId-scoped override wins over the global default.
    public class GetEntityLayout
        : BaseEndpoint<GetEntityLayout.Params, GB5Shared.DTO.Framework.ResponseStandard.ResponseStandardDTO<object>>
    {
        private readonly IEntityLayoutBLL _Bll;

        public GetEntityLayout(IEntityLayoutBLL bll) => _Bll = bll;

        public override void Configure()
        {
            Get("/EntityViewer/GetEntityLayout");
            AllowAnonymous();
        }

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

        protected override string? GetCacheKey(Params req, LoginDTO loginDTO)
            => KeyGenerator.KeyGeneration(req.EntityCode, EntityConstant.ENTITYLAYOUT, CacheKeyLevel.CLIENT_LEVEL, loginDTO);

        protected override async Task<GB5Shared.DTO.Framework.ResponseStandard.ResponseStandardDTO<object>> ExecuteAsync(
            Params req, LoginDTO loginDTO, CancellationToken ct)
        {
            try
            {
                var result = await _Bll.GetActiveLayout(req.EntityCode, loginDTO, ct);

                // The FE expects the parsed LayoutSchema (with a top-level "sections" array)
                // directly as the response body, not the EntityLayoutVersionDTO wrapper whose
                // SnapshotJson field carries that schema as a serialized string.
                object? layout = string.IsNullOrWhiteSpace(result?.SnapshotJson)
                    ? null
                    : JsonSerializer.Deserialize<JsonElement>(result.SnapshotJson);

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