using TMSDAL.DTO.Assessment;
using TMSDAL.DTO.AttemptResponse;

namespace TMSBLL.Assessment
{
    public class EvaluationResultDTO
    {
        // False means "not evaluated" — the response stays pending (IsCorrect = -1) for a human
        // grader via the existing EvaluateAssessmentAttempt endpoint. The default
        // AssessmentAnswerEvaluationService always returns this.
        public bool Evaluated { get; set; }
        public bool IsCorrect { get; set; }
        public short MarksAwarded { get; set; }
    }

    // Extension point for AI-assisted evaluation of subjective (non-objective) answers — e.g.
    // essay-type ShortAnswer questions flagged RequiresManualEvaluation. The default
    // implementation is a no-op (response stays pending for a human grader); a real AI evaluator
    // is registered later purely via DI, with no change to SubmitAssessmentAttempt's calling code.
    public interface IAssessmentAnswerEvaluationService
    {
        Task<EvaluationResultDTO> EvaluateAsync(AttemptResponseDTO response, AssessmentQuestionDTO question, CancellationToken ct);
    }

    // Named to match assembly-scan's Foo->IFoo auto-registration convention (AsMatchingInterface) —
    // a "NoOp"-prefixed name here would silently fail to register, leaving AssessmentAttemptBLL
    // unconstructable (confirmed live via HRFinanceHost's /health DI pre-flight check).
    public class AssessmentAnswerEvaluationService : IAssessmentAnswerEvaluationService
    {
        public Task<EvaluationResultDTO> EvaluateAsync(AttemptResponseDTO response, AssessmentQuestionDTO question, CancellationToken ct)
            => Task.FromResult(new EvaluationResultDTO { Evaluated = false });
    }
}