namespace TMSDAL.DTO.Assessment
{
    public class SessionAssessmentDTO
    {
        public int AssessmentId { get; set; }

        public int ProgrammeId { get; set; }
        public string? ProgrammeCode { get; set; }
        public string? ProgrammeTitle { get; set; }

        public int ProgrammeSessionId { get; set; }
        public string? SessionCode { get; set; }
        public string? SessionTitle { get; set; }

        public int SessionTopicId { get; set; }
        public string? TopicCode { get; set; }
        public string? TopicTitle { get; set; }

        public string AssessmentTitle { get; set; } = string.Empty;

        public byte AssessmentType { get; set; }
        public byte AssessmentMode { get; set; } // 0 = Simple, 1 = Structured

        public byte IsPreAssessment { get; set; }
        public byte IsPostAssessment { get; set; }

        public short PassThresholdPct { get; set; }
        public short MaxAttempts { get; set; }
        public int DurationMins { get; set; }

        public int TotalMarks { get; set; }

        public byte IsLmsDelivered { get; set; }
        public int LmsAssessmentId { get; set; }

        public byte RandomiseQuestions { get; set; }
        public byte ShowAnswersOnComplete { get; set; }

        public byte IsActive { get; set; }

        public int TenantId { get; set; }

        // Optional standard fields (for GET/update scenarios)
        public short Version { get; set; }
        public byte Status { get; set; }
        public short SortOrder { get; set; }
        public byte SourceType { get; set; }

        // MODE BASED
        public List<AssessmentQuestionDTO>? Questions { get; set; }   // Simple
        public AssessmentPaperDTO? Paper { get; set; }                // Structured
        public int ModifiedById { get; set; }
        public DateTime ModifiedOn { get; set; }
        public int CreatedById { get; set; }
        public DateTime CreatedOn { get; set; }
    }

    public class AssessmentQuestionDTO
    {
        public int AssessmentQuestionId { get; set; }
        public int AssessmentId { get; set; }

        public short SlNo { get; set; }

        public string QuestionText { get; set; } = string.Empty;
        public byte QuestionType { get; set; }

        public string? OptionsJson { get; set; }   // ✅ Correct as per DB
        public string CorrectAnswer { get; set; } = string.Empty;

        public short Marks { get; set; }

        public string? Explanation { get; set; }
        public byte RequiresManualEvaluation { get; set; }
        public int TenantId { get; set; }
    }
    public class AssessmentPaperDTO
    {
        public int AssessmentPaperId { get; set; }
        public int AssessmentId { get; set; }

        public string PaperTitle { get; set; } = string.Empty;

        public byte SelectionMode { get; set; }   // 0 Fixed, 1 Random, 2 Weighted
        public int TotalQuestions { get; set; }
        public int DurationMins { get; set; }

        public byte RandomiseOrder { get; set; }
        public byte ShowOneAtTime { get; set; }
        public byte AllowReview { get; set; }

        public byte IsLmsDelivered { get; set; }
        public int LmsAssessmentId { get; set; }

        public List<PaperSectionDTO>? Sections { get; set; }
    }
    public class PaperSectionDTO
    {
        // =====================================================
        // PRIMARY KEY
        // =====================================================
        public int PaperSectionId { get; set; }

        // =====================================================
        // PARENT FK
        // =====================================================
        public int AssessmentPaperId { get; set; }

        /// <summary>
        /// Joined from MASSESSMENTPAPER — display reference for FK
        /// </summary>
        public string? PaperTitle { get; set; }

        // =====================================================
        // SEQUENCE
        // =====================================================
        public short SlNo { get; set; } = 1;

        // =====================================================
        // BUSINESS COLUMNS
        // =====================================================
        public string SectionTitle { get; set; } = string.Empty;

        public short QuestionCount { get; set; } = 5;

        /// <summary>
        /// -1 = Any, 0 = MCQ, 1 = TrueFalse, 2 = ShortAnswer,
        /// 3 = Essay, 4 = Matching, 5 = FillInTheBlank
        /// </summary>
        public short QuestionTypeFilter { get; set; } = -1;

        /// <summary>
        /// -1 = Any, 0 = Easy, 1 = Medium, 2 = Hard
        /// </summary>
        public short DifficultyFilter { get; set; } = -1;

        public string? IndustryTagFilter { get; set; }

        /// <summary>
        /// JSON array of SkillIds e.g. [1, 2, 3]
        /// </summary>
        public string? SkillTagFilter { get; set; }

        /// <summary>
        /// JSON array of topic tags e.g. ["Safety", "Compliance"]
        /// </summary>
        public string? TopicTagFilter { get; set; }

        /// <summary>
        /// Taxonomy bridge (Quiz roadmap Phase 0, sub-phase 3). -1 = Any. Dual-read alongside
        /// TopicTagFilter — see QuestionBankQB.GET_QUESTIONS_FOR_SECTION.
        /// </summary>
        public int CourseIdFilter { get; set; } = -1;
        public int SubjectIdFilter { get; set; } = -1;
        public int TopicIdFilter { get; set; } = -1;

        public short MarksPerQuestion { get; set; } = 1;

        // =====================================================
        // CHILD COLLECTION — populated on demand only
        // =====================================================
        public List<QuestionBankItemDTO>? Questions { get; set; }
    }


    public class QuestionBankItemDTO
    {
        public int QuestionBankId { get; set; }

        public string QuestionTitle { get; set; } = string.Empty;
        public string QuestionText { get; set; } = string.Empty;

        /// <summary>
        /// 0 = MCQ, 1 = TrueFalse, 2 = ShortAnswer,
        /// 3 = Essay, 4 = Matching, 5 = FillInTheBlank
        /// </summary>
        public byte QuestionType { get; set; }

        /// <summary>
        /// JSON array of answer options
        /// </summary>
        public string? OptionsJson { get; set; }

        public string CorrectAnswer { get; set; } = string.Empty;

        public short Marks { get; set; }

        /// <summary>
        /// 0 = Easy, 1 = Medium, 2 = Hard
        /// </summary>
        public byte Difficulty { get; set; }

        public string? IndustryTag { get; set; }
        public string? SkillTags { get; set; }  // JSON array of SkillIds
        public string? TopicTags { get; set; }  // JSON array of topic tags
        public string? ExplanationText { get; set; }

        /// <summary>Taxonomy bridge (Quiz roadmap Phase 0, sub-phase 3). -1 = unassigned.</summary>
        public int TopicId { get; set; } = -1;

        public byte IsActive { get; set; }
        public int TenantId { get; set; }
    }
}