using FastEndpoints;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.FastEndPoint;
using QMSBLL.Matrix;
using static GB5Shared.GB5Constant.Constant;

namespace QMSSL.EndPoints.Matrix
{
    public class SaveSetSerialGenration
        : BaseEndpoint<SaveSetSerialGenration.Params, ResponseStandardDTO<object>>
    {
        private readonly IMatrixBLL _bll;
        public SaveSetSerialGenration(IMatrixBLL bll) => _bll = bll;

        public override void Configure()
        {
            Post("/Matrix/SaveSetSerialGenration");
            AllowAnonymous();
            Description(x => x
                .WithTags("Matrix")
                .WithSummary("Save Set & Serial Generation")
                .WithDescription("Matrix-independent SAVE: persists the same per-item, per-set serials " +
                    "shown by GenerateMatrixLots into TLOT and TLOTDETAIL only — does not touch TMATRIX, " +
                    "TMATRIXINPUT, or TMATRIXOUTPUT. Caller passes AllotedAllocationId (e.g. from " +
                    "GetSelectListAllocationWithItem) instead of MatrixId. SetsToGenerate controls how many " +
                    "sets to save (0 = all remaining ungenerated sets). SelectedSerials (optional) lets the " +
                    "caller deselect specific serial tiles shown in the FG View before saving — key is the " +
                    "FG item's ItemId, value is the list of RunningNumbers to actually keep/issue for that " +
                    "item this run; the count must exactly equal QtyPerSet × SetsToGenerate for that item. " +
                    "Any generated number NOT in the list for an item that HAS an entry is still written (so " +
                    "the sequence never reissues it) but marked skipped/available instead of issued, and can " +
                    "be picked up later via GetSkippedSerials. Omit an ItemId entirely (or omit " +
                    "SelectedSerials) to keep the old all-generated-numbers-issued behavior. " +
                    "Irreversible — call GenerateMatrixLots first to review before calling this."));
        }

        public record RequestBody(
            int AllotedAllocationId,
            int SetsToGenerate,
            Dictionary<int, HashSet<int>>? SelectedSerials = null);

        public record Params(
            [property: FromHeader] string Login,
            [property: FromBody] RequestBody Body);

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

        protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(
            Params req, LoginDTO login, CancellationToken ct)
        {
            try
            {
                var result = await _bll.SaveSetSerialGenerationAsync(
                    req.Body.AllotedAllocationId, req.Body.SetsToGenerate, login, ct,
                    req.Body.SelectedSerials);

                return await GB5Shared.ResponseStandard.Response
                    .CreateSuccessResponse(result, CacheKeyLevel.NOT_REQUIRED, login);
            }
            catch (InvalidOperationException ex)
            {
                // Includes the "please retry" message for a concurrent-save collision
                // (see SaveSetSerialGenerationAsync) — a caller input/timing problem,
                // not a server fault, so 400 not 500.
                return await GB5Shared.ResponseStandard.Response
                    .CreateExceptionError<string>(ex, CacheKeyLevel.NOT_REQUIRED, login, ex.Message, 400);
            }
            catch (Exception ex)
            {
                return await GB5Shared.ResponseStandard.Response
                    .CreateExceptionError<string>(ex, CacheKeyLevel.NOT_REQUIRED, login, ex.Message, 500);
            }
        }
    }
}