Add server-authoritative RZ Coin rewards

api/QuestionsApi/Controllers/ExamSimulationsController.cs

@@ -9,7 +9,10 @@ namespace QuestionsApi.Controllers;
 [ApiController]
 [Route("api/exam-simulations")]
 [Authorize(Roles = "USER,SUPER")]
-public class ExamSimulationsController(ExamSimulationStore simulations, CreditStore credits) : ControllerBase
+public class ExamSimulationsController(
+    ExamSimulationStore simulations,
+    CreditStore credits,
+    MasteryAwardService masteryAwards) : ControllerBase
 {
     [HttpGet("readiness")]
     public async Task<IActionResult> Readiness() => Ok(await simulations.GetReadinessAsync(UserId()));
@@ -132,7 +135,23 @@ public class ExamSimulationsController(ExamSimulationStore simulations, CreditSt
     {
         var simulation = await simulations.GetOwnedAsync(id, UserId());
         if (simulation is null) return NotFound();
-        try { return Ok(await simulations.ToResponseAsync(await simulations.SubmitBlockAsync(simulation))); }
+        try
+        {
+            var userId = UserId();
+            await masteryAwards.PrepareAsync(userId);
+            simulation = await simulations.SubmitBlockAsync(simulation);
+            var response = await simulations.ToResponseAsync(simulation);
+            if (simulation.State == ExamSimulationStates.Completed && !simulation.IsSample)
+            {
+                var result = await credits.AwardAsync(userId, new CreditAwardRequest(
+                    $"simulation:{simulation.Id}", 10, CreditReasonCodes.ExamSimulationComplete,
+                    "Completed a Step 3 exam simulation", "exam_simulation", simulation.Id ?? "", false));
+                if (result.Award is not null) response.CreditAwards.Add(result.Award);
+                response.CreditAwards.AddRange(await masteryAwards.AwardPromotionsAsync(userId));
+                response.Credits = await credits.GetStatusAsync(userId);
+            }
+            return Ok(response);
+        }
         catch (InvalidOperationException exception) { return Conflict(exception.Message); }
     }