using FastEndpoints;
using GB5Shared.DTO.Framework.Criteria;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.FastEndPoint;
using MMBLL.Register;
using static GB5Shared.GB5Constant.Constant;

namespace MMSL.EndPoints.Register
{
    // Route matches the legacy GB4 Register.svc/DocumentTraceability endpoint exactly —
    // MWEBSERVICE -1399991650 is repointed at this route (see the MM migration script).
    // Not paged — a partial trace isn't meaningful, same reasoning as BOM Tree.
    public class GetDocumentTraceability : BaseEndpoint<GetDocumentTraceability.GetDocumentTraceabilityParameters, ResponseStandardDTO<object>>
    {
        private readonly IRegisterBLL _RegisterBLL;

        public GetDocumentTraceability(IRegisterBLL registerBLL)
        {
            _RegisterBLL = registerBLL;
        }

        public override void Configure()
        {
            Post("/Register/DocumentTraceability");
            AllowAnonymous();
        }

        public record GetDocumentTraceabilityParameters(
            [property: FromHeader] string Login,
            [property: FromBody] CriteriaDTO CriteriaDTO,
            [property: QueryParam] int FirstNumber,
            [property: QueryParam] int MaxResult
            );

        protected override string? GetCacheKey(GetDocumentTraceabilityParameters req, LoginDTO login) => null;

        protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(GetDocumentTraceabilityParameters req, LoginDTO LoginDTO, CancellationToken ct)
        {
            try
            {
                int pivotAllocationId = ParsePivotAllocationId(req.CriteriaDTO);
                var trace = await _RegisterBLL.GetDocumentTraceability(pivotAllocationId, LoginDTO!, ct);
                return await GB5Shared.ResponseStandard.Response.CreateSuccessResponse(trace, CacheKeyLevel.NOT_REQUIRED, LoginDTO);
            }
            catch (Exception ex)
            {
                return await GB5Shared.ResponseStandard.Response
                    .CreateExceptionError<string>(ex, CacheKeyLevel.NOT_REQUIRED, LoginDTO, ex.Message, 500);
            }
        }

        private static int ParsePivotAllocationId(CriteriaDTO? criteriaDTO)
        {
            if (criteriaDTO?.SectionCriteriaList == null) return -1;
            foreach (var sec in criteriaDTO.SectionCriteriaList)
            {
                foreach (var attr in sec.AttributesCriteriaList)
                {
                    if (attr.FieldValue is null) continue;
                    if (string.Equals(attr.FieldName, "AllocationId", StringComparison.OrdinalIgnoreCase) &&
                        int.TryParse(attr.FieldValue.ToString(), out var id))
                        return id;
                }
            }
            return -1;
        }
    }
}