using System.Linq;
using FastEndpoints;
using GB5Shared.DTO.Framework.Criteria;
using GB5Shared.DTO.Framework.Logging;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.DTO.Report;
using GB5Shared.FastEndPoint;
using MMBLL.BOM;
using static GB5Shared.GB5Constant.Constant;

namespace MMSL.EndPoints.BOM
{
    // Route matches the legacy GB4 BOM.svc/Tree endpoint exactly — MWEBSERVICE -1399999813 is
    // repointed at this route (see the MM migration script). Live query every call — no caching,
    // no materialized/cached tree — per the plan's explicit direction (structural BOM/master changes
    // must be immediately visible, and cache-invalidation-on-structural-change is itself risky).
    public class GetBOMTree : BaseEndpoint<GetBOMTree.GetBOMTreeParameters, ResponseStandardDTO<object>>
    {
        private readonly IBOMBLL _BOMBLL;

        public GetBOMTree(IBOMBLL IBOMBLL)
        {
            _BOMBLL = IBOMBLL;
        }

        public override void Configure()
        {
            Post("/BOM/Tree");
            AllowAnonymous();
        }

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

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

        protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(GetBOMTreeParameters req, LoginDTO LoginDTO, CancellationToken ct)
        {
            try
            {
                var (bomId, quantityForBom) = ParseCriteria(req.ReportCallingDTO.CriteriaDTO);
                var tree = await _BOMBLL.GetBOMTree(bomId, quantityForBom, LoginDTO!, ct);
                return await GB5Shared.ResponseStandard.Response.CreateSuccessResponse(tree, 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 BomId, decimal QuantityForBom) ParseCriteria(CriteriaDTO? criteriaDTO)
        {
            int bomId = -1;
            decimal quantityForBom = 1;
            if (criteriaDTO?.SectionCriteriaList == null) return (bomId, quantityForBom);

            foreach (var sec in criteriaDTO.SectionCriteriaList)
            {
                foreach (var attr in sec.AttributesCriteriaList ?? [])
                {
                    if (attr.FieldValue is null) continue;
                    switch (attr.FieldName?.ToLowerInvariant())
                    {
                        case "bomid":
                            if (int.TryParse(attr.FieldValue.ToString(), out var b)) bomId = b;
                            break;
                        case "quantityforbom":
                            if (decimal.TryParse(attr.FieldValue.ToString(), out var q) && q > 0) quantityForBom = q;
                            break;
                    }
                }
            }
            return (bomId, quantityForBom);
        }
    }
}