timed revision

Mindforge.API/Services/FlashcardService.cs

@@ -98,6 +98,61 @@ namespace Mindforge.API.Services
             return await _flashcardRepository.GetCardsForLibrariesAsync(libraryIds);
         }
 
+        public async Task<FlashcardRagDashboard> GetRagStatusAsync()
+        {
+            var now = DateTime.UtcNow;
+            var cards = await _flashcardRepository.GetAllCardsWithLibraryAsync();
+
+            var ragCards = cards
+                .Select(card => BuildRagCard(card, now))
+                .ToList();
+
+            var subjectGroups = ragCards
+                .GroupBy(card => card.Subject, StringComparer.OrdinalIgnoreCase)
+                .OrderBy(group => group.Key, StringComparer.OrdinalIgnoreCase)
+                .Select(subjectGroup =>
+                {
+                    var subSubjectGroups = subjectGroup
+                        .GroupBy(card => card.SubSubject, StringComparer.OrdinalIgnoreCase)
+                        .OrderBy(group => group.Key, StringComparer.OrdinalIgnoreCase)
+                        .Select(subSubjectGroup =>
+                        {
+                            var subSubjectCards = subSubjectGroup.ToList();
+                            return new FlashcardRagSubSubjectGroup
+                            {
+                                SubSubject = subSubjectGroup.Key,
+                                Summary = BuildSummary(subSubjectCards),
+                                Cards = subSubjectCards
+                            };
+                        })
+                        .ToList();
+
+                    return new FlashcardRagSubjectGroup
+                    {
+                        Subject = subjectGroup.Key,
+                        Summary = BuildSummary(subjectGroup),
+                        SubSubjects = subSubjectGroups
+                    };
+                })
+                .ToList();
+
+            return new FlashcardRagDashboard
+            {
+                GeneratedAt = now,
+                Subjects = subjectGroups
+            };
+        }
+
+        public async Task RecordReviewAnswerAsync(long cardId, bool correct)
+        {
+            if (cardId <= 0)
+            {
+                throw new UserException("Card de revisao invalido.");
+            }
+
+            await _flashcardRepository.RecordReviewAnswerAsync(cardId, correct);
+        }
+
         private async Task<IReadOnlyList<FlashcardDraftCard>> GenerateCardsForFileAsync(
             string filePath,
             string fileContent,
@@ -228,6 +283,120 @@ namespace Mindforge.API.Services
             return segments[0];
         }
 
+        private static string ExtractSubSubject(string filePath)
+        {
+            var normalized = filePath.Replace('\\', '/');
+            var segments = normalized.Split('/', StringSplitOptions.RemoveEmptyEntries);
+            if (segments.Length <= 2)
+            {
+                return "Geral";
+            }
+
+            var concursosIndex = Array.FindIndex(
+                segments,
+                segment => segment.Equals("concursos", StringComparison.OrdinalIgnoreCase)
+                    || segment.Equals("concurso", StringComparison.OrdinalIgnoreCase));
+
+            var subjectIndex = concursosIndex >= 0 && concursosIndex + 1 < segments.Length
+                ? concursosIndex + 1
+                : 0;
+
+            var subSubjectStart = subjectIndex + 1;
+            var subSubjectEnd = segments.Length - 1;
+
+            if (subSubjectStart >= subSubjectEnd)
+            {
+                return "Geral";
+            }
+
+            return string.Join(" / ", segments[subSubjectStart..subSubjectEnd]);
+        }
+
+        private static FlashcardRagCard BuildRagCard(FlashcardCardWithLibrary card, DateTime referenceTime)
+        {
+            var subject = string.IsNullOrWhiteSpace(card.Subject)
+                ? ExtractSubject(card.FilePath)
+                : card.Subject;
+            var subSubject = ExtractSubSubject(card.FilePath);
+            var totalAnswers = card.CorrectCount + card.IncorrectCount;
+            var performanceRate = totalAnswers == 0
+                ? 0
+                : (double)card.CorrectCount / totalAnswers;
+
+            return new FlashcardRagCard
+            {
+                CardId = card.Id,
+                LibraryId = card.LibraryId,
+                FileName = card.FileName,
+                Subject = subject,
+                SubSubject = subSubject,
+                Front = card.Front,
+                Back = card.Back,
+                CorrectCount = card.CorrectCount,
+                IncorrectCount = card.IncorrectCount,
+                TotalAnswers = totalAnswers,
+                PerformanceRate = performanceRate,
+                LastReviewedAt = card.LastReviewedAt,
+                RagStatus = DetermineRagStatus(card.LastReviewedAt, performanceRate, referenceTime)
+            };
+        }
+
+        private static string DetermineRagStatus(DateTime? lastReviewedAt, double performanceRate, DateTime referenceTime)
+        {
+            if (!lastReviewedAt.HasValue)
+            {
+                return "Grey";
+            }
+
+            var lastReviewUtc = lastReviewedAt.Value.ToUniversalTime();
+            var elapsedDays = (referenceTime.Date - lastReviewUtc.Date).TotalDays;
+
+            if (elapsedDays >= 40 || performanceRate < 0.4)
+            {
+                return "Red";
+            }
+
+            if (elapsedDays >= 30 || performanceRate <= 0.6)
+            {
+                return "Amber";
+            }
+
+            if (elapsedDays < 30 && performanceRate > 0.6)
+            {
+                return "Green";
+            }
+
+            return "Amber";
+        }
+
+        private static FlashcardRagSummary BuildSummary(IEnumerable<FlashcardRagCard> cards)
+        {
+            var cardList = cards.ToList();
+            var greenCount = cardList.Count(card => card.RagStatus == "Green");
+            var amberCount = cardList.Count(card => card.RagStatus == "Amber");
+            var redCount = cardList.Count(card => card.RagStatus == "Red");
+            var greyCount = cardList.Count(card => card.RagStatus == "Grey");
+            var activeCount = greenCount + amberCount + redCount;
+
+            var greenPercentage = activeCount == 0
+                ? 0
+                : Math.Round((double)greenCount / activeCount * 100, 2);
+            var attentionPercentage = activeCount == 0
+                ? 0
+                : Math.Round((double)(amberCount + redCount) / activeCount * 100, 2);
+
+            return new FlashcardRagSummary
+            {
+                GreenCount = greenCount,
+                AmberCount = amberCount,
+                RedCount = redCount,
+                GreyCount = greyCount,
+                ActiveCount = activeCount,
+                GreenPercentage = greenPercentage,
+                AttentionPercentage = attentionPercentage
+            };
+        }
+
         private class FlashcardJsonPayload
         {
             public List<FlashcardJsonCard> Flashcards { get; set; } = [];