Add study session goals and summaries

api/QuestionsApi/Models/CreditModels.cs

@@ -109,6 +109,7 @@ public static class CreditReasonCodes
     public const string MasteryStrong = "mastery_strong";
     public const string MasteryMastered = "mastery_mastered";
     public const string ExamSimulationComplete = "exam_simulation_complete";
+    public const string SessionGoalComplete = "session_goal_complete";
     public const string Purchase = "purchase";
 }
 

api/QuestionsApi/Models/ExamSimulation.cs

@@ -119,6 +119,8 @@ public class ExamSimulationStateResponse
     public List<QuestionResponse> ReviewQuestions { get; set; } = [];
     public CreditStatusResponse? Credits { get; set; }
     public List<CreditAward> CreditAwards { get; set; } = [];
+    public StudySessionProgress? StudySessionProgress { get; set; }
+    public StudySessionSummary? SessionSummary { get; set; }
 }
 
 public class ExamSimulationReadinessResponse

api/QuestionsApi/Models/QuestionRequests.cs

@@ -51,4 +51,5 @@ public class FirstQuestionAttemptRequest
     public List<string> PresentedChoiceIds { get; set; } = [];
     public int DurationSeconds { get; set; }
     public bool MetTimeLimit { get; set; } = true;
+    public string? StudySessionId { get; set; }
 }

api/QuestionsApi/Models/QuestionResponse.cs

@@ -147,6 +147,8 @@ public class FirstQuestionAttemptResponse
     public RatingChangeResponse? Rating { get; set; }
     public CreditStatusResponse? Credits { get; set; }
     public List<CreditAward> CreditAwards { get; set; } = [];
+    public StudySessionProgress? StudySessionProgress { get; set; }
+    public StudySessionSummary? SessionSummary { get; set; }
 }
 
 public class SkipQuestionResponse

api/QuestionsApi/Models/ReviewQueueModels.cs

@@ -73,6 +73,7 @@ public sealed class ReviewQueueAttemptRequest
     public string ChoiceId { get; set; } = "";
     public List<string> PresentedChoiceIds { get; set; } = [];
     public int DurationSeconds { get; set; }
+    public string? StudySessionId { get; set; }
 }
 
 public sealed class ReviewQueueAttemptResponse
@@ -83,6 +84,8 @@ public sealed class ReviewQueueAttemptResponse
     public int PendingCount { get; set; }
     public CreditStatusResponse? Credits { get; set; }
     public List<CreditAward> CreditAwards { get; set; } = [];
+    public StudySessionProgress? StudySessionProgress { get; set; }
+    public StudySessionSummary? SessionSummary { get; set; }
 }
 
 public sealed class ReviewQueueRecordResult

api/QuestionsApi/Models/StudySessionModels.cs

@@ -0,0 +1,106 @@
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization.Attributes;
+
+namespace QuestionsApi.Models;
+
+public static class StudyGoalTypes
+{
+    public const string QuestionCount = "question_count";
+    public const string Duration = "duration";
+    public const string WeakSystem = "weak_system";
+    public const string DueReviews = "due_reviews";
+    public const string SimulationBlock = "simulation_block";
+    public static readonly HashSet<string> All = [QuestionCount, Duration, WeakSystem, DueReviews, SimulationBlock];
+}
+
+public static class StudySessionStates
+{
+    public const string Active = "active";
+    public const string Completed = "completed";
+    public const string EndedEarly = "ended_early";
+    public const string Interrupted = "interrupted";
+}
+
+public sealed class StudySession
+{
+    [BsonId]
+    [BsonRepresentation(BsonType.ObjectId)]
+    public string? Id { get; set; }
+    public string UserId { get; set; } = "";
+    public string ClientSessionId { get; set; } = "";
+    public string GoalType { get; set; } = StudyGoalTypes.QuestionCount;
+    public string Mode { get; set; } = "Tutor";
+    public string Step3System { get; set; } = "";
+    public int TargetValue { get; set; } = 10;
+    public string State { get; set; } = StudySessionStates.Active;
+    public int QuestionsCompleted { get; set; }
+    public int Correct { get; set; }
+    public int ReviewsCompleted { get; set; }
+    public int Recovered { get; set; }
+    public int CoinsEarned { get; set; }
+    public List<CreditAward> CoinAwards { get; set; } = [];
+    public List<string> AppliedEventIds { get; set; } = [];
+    public int? InitialMasteryScore { get; set; }
+    public string InitialMasteryState { get; set; } = "";
+    public int? FinalMasteryScore { get; set; }
+    public string FinalMasteryState { get; set; } = "";
+    public int? InitialReadiness { get; set; }
+    public int? FinalReadiness { get; set; }
+    public string SimulationId { get; set; } = "";
+    public int? SimulationBlock { get; set; }
+    public DateTime CreatedUtc { get; set; }
+    public DateTime UpdatedUtc { get; set; }
+    public DateTime? TargetEndUtc { get; set; }
+    public DateTime? CompletedUtc { get; set; }
+}
+
+public sealed class CreateStudySessionRequest
+{
+    public string ClientSessionId { get; set; } = "";
+    public string GoalType { get; set; } = StudyGoalTypes.QuestionCount;
+    public int TargetValue { get; set; } = 10;
+    public string Mode { get; set; } = "Tutor";
+    public string Step3System { get; set; } = "";
+}
+
+public sealed class StudySessionProgress
+{
+    public string Id { get; set; } = "";
+    public string State { get; set; } = "";
+    public string GoalType { get; set; } = "";
+    public int TargetValue { get; set; }
+    public int CompletedValue { get; set; }
+    public int QuestionsCompleted { get; set; }
+    public int SecondsRemaining { get; set; }
+    public bool GoalReached { get; set; }
+}
+
+public sealed class StudySessionSummary
+{
+    public string Id { get; set; } = "";
+    public string State { get; set; } = "";
+    public string GoalType { get; set; } = "";
+    public int TargetValue { get; set; }
+    public int CompletedValue { get; set; }
+    public int QuestionsCompleted { get; set; }
+    public int Correct { get; set; }
+    public int Accuracy { get; set; }
+    public int ReviewsCompleted { get; set; }
+    public int Recovered { get; set; }
+    public int ElapsedSeconds { get; set; }
+    public int CoinsEarned { get; set; }
+    public List<CreditAward> CoinAwards { get; set; } = [];
+    public string Step3System { get; set; } = "";
+    public int? MasteryScoreChange { get; set; }
+    public string InitialMasteryState { get; set; } = "";
+    public string FinalMasteryState { get; set; } = "";
+    public int? ReadinessChange { get; set; }
+    public string ReadinessExplanation { get; set; } = "A completed exam simulation is required to update readiness.";
+    public bool GoalBonusAwarded { get; set; }
+}
+
+public sealed class StudySessionEnvelope
+{
+    public StudySessionProgress Progress { get; set; } = new();
+    public StudySessionSummary? Summary { get; set; }
+}