498 lines
17 KiB
C#
498 lines
17 KiB
C#
using DramaLing.Api.Data;
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using DramaLing.Api.Models.Entities;
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using DramaLing.Api.Services;
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using Microsoft.EntityFrameworkCore;
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namespace DramaLing.Api.Services;
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/// <summary>
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/// 學習會話服務介面
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/// </summary>
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public interface IStudySessionService
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{
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Task<StudySession> StartSessionAsync(Guid userId);
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Task<CurrentTestDto> GetCurrentTestAsync(Guid sessionId);
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Task<SubmitTestResponseDto> SubmitTestAsync(Guid sessionId, SubmitTestRequestDto request);
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Task<NextTestDto> GetNextTestAsync(Guid sessionId);
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Task<ProgressDto> GetProgressAsync(Guid sessionId);
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Task<StudySession> CompleteSessionAsync(Guid sessionId);
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}
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/// <summary>
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/// 學習會話服務實現
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/// </summary>
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public class StudySessionService : IStudySessionService
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{
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private readonly DramaLingDbContext _context;
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private readonly ILogger<StudySessionService> _logger;
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private readonly IReviewModeSelector _reviewModeSelector;
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public StudySessionService(
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DramaLingDbContext context,
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ILogger<StudySessionService> logger,
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IReviewModeSelector reviewModeSelector)
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{
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_context = context;
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_logger = logger;
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_reviewModeSelector = reviewModeSelector;
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}
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/// <summary>
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/// 開始新的學習會話
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/// </summary>
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public async Task<StudySession> StartSessionAsync(Guid userId)
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{
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_logger.LogInformation("Starting new study session for user {UserId}", userId);
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// 獲取到期詞卡
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var dueCards = await GetDueCardsAsync(userId);
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if (!dueCards.Any())
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{
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throw new InvalidOperationException("No due cards available for study");
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}
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// 獲取用戶CEFR等級
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var user = await _context.Users.FindAsync(userId);
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var userCEFRLevel = user?.EnglishLevel ?? "A2";
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// 創建學習會話
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var session = new StudySession
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{
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Id = Guid.NewGuid(),
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UserId = userId,
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SessionType = "mixed", // 混合模式
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StartedAt = DateTime.UtcNow,
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Status = SessionStatus.Active,
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TotalCards = dueCards.Count,
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CurrentCardIndex = 0
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};
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_context.StudySessions.Add(session);
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// 為每張詞卡創建學習進度記錄
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int totalTests = 0;
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for (int i = 0; i < dueCards.Count; i++)
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{
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var card = dueCards[i];
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var wordCEFRLevel = card.DifficultyLevel ?? "A2";
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var plannedTests = _reviewModeSelector.GetPlannedTests(userCEFRLevel, wordCEFRLevel);
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var studyCard = new StudyCard
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{
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Id = Guid.NewGuid(),
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StudySessionId = session.Id,
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FlashcardId = card.Id,
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Word = card.Word,
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PlannedTests = plannedTests,
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Order = i,
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StartedAt = DateTime.UtcNow
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};
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_context.StudyCards.Add(studyCard);
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totalTests += plannedTests.Count;
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}
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session.TotalTests = totalTests;
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// 設置第一個測驗
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if (session.StudyCards.Any())
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{
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var firstCard = session.StudyCards.OrderBy(c => c.Order).First();
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session.CurrentTestType = firstCard.PlannedTests.First();
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}
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await _context.SaveChangesAsync();
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_logger.LogInformation("Study session created: {SessionId}, Cards: {CardCount}, Tests: {TestCount}",
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session.Id, session.TotalCards, session.TotalTests);
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return session;
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}
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/// <summary>
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/// 獲取當前測驗
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/// </summary>
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public async Task<CurrentTestDto> GetCurrentTestAsync(Guid sessionId)
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{
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var session = await GetSessionWithDetailsAsync(sessionId);
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if (session == null || session.Status != SessionStatus.Active)
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{
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throw new InvalidOperationException("Session not found or not active");
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}
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var currentCard = session.StudyCards.OrderBy(c => c.Order).Skip(session.CurrentCardIndex).FirstOrDefault();
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if (currentCard == null)
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{
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throw new InvalidOperationException("No current card found");
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}
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var flashcard = await _context.Flashcards
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.FirstOrDefaultAsync(f => f.Id == currentCard.FlashcardId);
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return new CurrentTestDto
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{
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SessionId = sessionId,
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TestType = session.CurrentTestType ?? "flip-memory",
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Card = new CardDto
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{
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Id = flashcard!.Id,
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Word = flashcard.Word,
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Translation = flashcard.Translation,
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Definition = flashcard.Definition,
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Example = flashcard.Example,
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ExampleTranslation = flashcard.ExampleTranslation,
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Pronunciation = flashcard.Pronunciation,
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DifficultyLevel = flashcard.DifficultyLevel
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},
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Progress = new ProgressSummaryDto
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{
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CurrentCardIndex = session.CurrentCardIndex,
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TotalCards = session.TotalCards,
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CompletedTests = session.CompletedTests,
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TotalTests = session.TotalTests,
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CompletedCards = session.CompletedCards
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}
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};
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}
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/// <summary>
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/// 提交測驗結果
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/// </summary>
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public async Task<SubmitTestResponseDto> SubmitTestAsync(Guid sessionId, SubmitTestRequestDto request)
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{
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var session = await GetSessionWithDetailsAsync(sessionId);
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if (session == null || session.Status != SessionStatus.Active)
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{
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throw new InvalidOperationException("Session not found or not active");
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}
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var currentCard = session.StudyCards.OrderBy(c => c.Order).Skip(session.CurrentCardIndex).FirstOrDefault();
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if (currentCard == null)
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{
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throw new InvalidOperationException("No current card found");
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}
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// 記錄測驗結果
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var testResult = new TestResult
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{
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Id = Guid.NewGuid(),
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StudyCardId = currentCard.Id,
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TestType = request.TestType,
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IsCorrect = request.IsCorrect,
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UserAnswer = request.UserAnswer,
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ConfidenceLevel = request.ConfidenceLevel,
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ResponseTimeMs = request.ResponseTimeMs,
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CompletedAt = DateTime.UtcNow
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};
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_context.TestResults.Add(testResult);
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// 更新會話進度
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session.CompletedTests++;
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// 檢查當前詞卡是否完成所有測驗
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var completedTestsForCard = await _context.TestResults
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.Where(tr => tr.StudyCardId == currentCard.Id)
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.CountAsync() + 1; // +1 因為當前測驗還未保存
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if (completedTestsForCard >= currentCard.PlannedTestsCount)
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{
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// 詞卡完成，觸發SM2算法更新
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currentCard.IsCompleted = true;
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currentCard.CompletedAt = DateTime.UtcNow;
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session.CompletedCards++;
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await UpdateFlashcardWithSM2Async(currentCard, testResult);
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}
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await _context.SaveChangesAsync();
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return new SubmitTestResponseDto
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{
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Success = true,
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IsCardCompleted = currentCard.IsCompleted,
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Progress = new ProgressSummaryDto
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{
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CurrentCardIndex = session.CurrentCardIndex,
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TotalCards = session.TotalCards,
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CompletedTests = session.CompletedTests,
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TotalTests = session.TotalTests,
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CompletedCards = session.CompletedCards
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}
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};
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}
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/// <summary>
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/// 獲取下一個測驗
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/// </summary>
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public async Task<NextTestDto> GetNextTestAsync(Guid sessionId)
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{
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var session = await GetSessionWithDetailsAsync(sessionId);
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if (session == null || session.Status != SessionStatus.Active)
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{
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throw new InvalidOperationException("Session not found or not active");
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}
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var currentCard = session.StudyCards.OrderBy(c => c.Order).Skip(session.CurrentCardIndex).FirstOrDefault();
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if (currentCard == null)
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{
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return new NextTestDto { HasNextTest = false, Message = "All cards completed" };
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}
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// 檢查當前詞卡是否還有未完成的測驗
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var completedTestTypes = await _context.TestResults
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.Where(tr => tr.StudyCardId == currentCard.Id)
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.Select(tr => tr.TestType)
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.ToListAsync();
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var nextTestType = currentCard.PlannedTests.FirstOrDefault(t => !completedTestTypes.Contains(t));
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if (nextTestType != null)
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{
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// 當前詞卡還有測驗
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session.CurrentTestType = nextTestType;
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await _context.SaveChangesAsync();
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return new NextTestDto
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{
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HasNextTest = true,
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TestType = nextTestType,
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SameCard = true,
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Message = $"Next test: {nextTestType}"
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};
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}
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else
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{
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// 當前詞卡完成，移到下一張詞卡
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session.CurrentCardIndex++;
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if (session.CurrentCardIndex < session.TotalCards)
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{
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var nextCard = session.StudyCards.OrderBy(c => c.Order).Skip(session.CurrentCardIndex).FirstOrDefault();
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session.CurrentTestType = nextCard?.PlannedTests.FirstOrDefault();
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await _context.SaveChangesAsync();
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return new NextTestDto
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{
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HasNextTest = true,
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TestType = session.CurrentTestType!,
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SameCard = false,
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Message = "Moving to next card"
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};
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}
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else
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{
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// 所有詞卡完成
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session.Status = SessionStatus.Completed;
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session.EndedAt = DateTime.UtcNow;
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await _context.SaveChangesAsync();
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return new NextTestDto
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{
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HasNextTest = false,
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Message = "Session completed"
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};
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}
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}
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}
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/// <summary>
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/// 獲取詳細進度
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/// </summary>
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public async Task<ProgressDto> GetProgressAsync(Guid sessionId)
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{
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var session = await GetSessionWithDetailsAsync(sessionId);
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if (session == null)
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{
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throw new InvalidOperationException("Session not found");
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}
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var cardProgress = session.StudyCards.Select(card => new CardProgressDto
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{
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CardId = card.FlashcardId,
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Word = card.Word,
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PlannedTests = card.PlannedTests,
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CompletedTestsCount = card.TestResults.Count,
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IsCompleted = card.IsCompleted,
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Tests = card.TestResults.Select(tr => new TestProgressDto
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{
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TestType = tr.TestType,
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IsCorrect = tr.IsCorrect,
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CompletedAt = tr.CompletedAt
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}).ToList()
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}).ToList();
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return new ProgressDto
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{
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SessionId = sessionId,
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Status = session.Status.ToString(),
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CurrentCardIndex = session.CurrentCardIndex,
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TotalCards = session.TotalCards,
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CompletedTests = session.CompletedTests,
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TotalTests = session.TotalTests,
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CompletedCards = session.CompletedCards,
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Cards = cardProgress
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};
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}
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/// <summary>
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/// 完成學習會話
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/// </summary>
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public async Task<StudySession> CompleteSessionAsync(Guid sessionId)
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{
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var session = await GetSessionWithDetailsAsync(sessionId);
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if (session == null)
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{
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throw new InvalidOperationException("Session not found");
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}
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session.Status = SessionStatus.Completed;
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session.EndedAt = DateTime.UtcNow;
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await _context.SaveChangesAsync();
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_logger.LogInformation("Study session completed: {SessionId}", sessionId);
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return session;
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}
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// Helper Methods
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private async Task<StudySession?> GetSessionWithDetailsAsync(Guid sessionId)
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{
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return await _context.StudySessions
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.Include(s => s.StudyCards)
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.ThenInclude(sc => sc.TestResults)
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.Include(s => s.StudyCards)
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.ThenInclude(sc => sc.Flashcard)
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.FirstOrDefaultAsync(s => s.Id == sessionId);
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}
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private async Task<List<Flashcard>> GetDueCardsAsync(Guid userId, int limit = 50)
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{
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var today = DateTime.Today;
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return await _context.Flashcards
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.Where(f => f.UserId == userId &&
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(f.NextReviewDate <= today || f.Repetitions == 0))
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.OrderBy(f => f.NextReviewDate)
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.Take(limit)
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.ToListAsync();
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}
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private async Task UpdateFlashcardWithSM2Async(StudyCard studyCard, TestResult latestResult)
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{
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var flashcard = await _context.Flashcards.FindAsync(studyCard.FlashcardId);
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if (flashcard == null) return;
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// 計算詞卡的綜合表現
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var allResults = await _context.TestResults
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.Where(tr => tr.StudyCardId == studyCard.Id)
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.ToListAsync();
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var correctCount = allResults.Count(r => r.IsCorrect);
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var totalTests = allResults.Count;
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var accuracy = totalTests > 0 ? (double)correctCount / totalTests : 0;
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// 使用現有的SM2Algorithm
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var quality = accuracy >= 0.8 ? 5 : accuracy >= 0.6 ? 4 : accuracy >= 0.4 ? 3 : 2;
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var sm2Input = new SM2Input(quality, flashcard.EasinessFactor, flashcard.Repetitions, flashcard.IntervalDays);
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var sm2Result = SM2Algorithm.Calculate(sm2Input);
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// 更新詞卡
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flashcard.EasinessFactor = sm2Result.EasinessFactor;
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flashcard.Repetitions = sm2Result.Repetitions;
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flashcard.IntervalDays = sm2Result.IntervalDays;
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flashcard.NextReviewDate = sm2Result.NextReviewDate;
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flashcard.MasteryLevel = SM2Algorithm.CalculateMastery(sm2Result.Repetitions, sm2Result.EasinessFactor);
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flashcard.TimesReviewed++;
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if (accuracy >= 0.7) flashcard.TimesCorrect++;
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flashcard.LastReviewedAt = DateTime.UtcNow;
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_logger.LogInformation("Updated flashcard {Word} with SM2: Mastery={Mastery}, NextReview={NextReview}",
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flashcard.Word, flashcard.MasteryLevel, sm2Result.NextReviewDate);
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}
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}
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// DTOs
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public class CurrentTestDto
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{
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public Guid SessionId { get; set; }
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public string TestType { get; set; } = string.Empty;
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public CardDto Card { get; set; } = new();
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public ProgressSummaryDto Progress { get; set; } = new();
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}
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public class SubmitTestRequestDto
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{
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public string TestType { get; set; } = string.Empty;
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public bool IsCorrect { get; set; }
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public string? UserAnswer { get; set; }
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public int? ConfidenceLevel { get; set; }
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public int ResponseTimeMs { get; set; }
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}
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public class SubmitTestResponseDto
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{
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public bool Success { get; set; }
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public bool IsCardCompleted { get; set; }
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public ProgressSummaryDto Progress { get; set; } = new();
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public string Message { get; set; } = string.Empty;
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}
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public class NextTestDto
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{
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public bool HasNextTest { get; set; }
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public string? TestType { get; set; }
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public bool SameCard { get; set; }
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public string Message { get; set; } = string.Empty;
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}
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public class ProgressDto
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{
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public Guid SessionId { get; set; }
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public string Status { get; set; } = string.Empty;
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public int CurrentCardIndex { get; set; }
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public int TotalCards { get; set; }
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public int CompletedTests { get; set; }
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public int TotalTests { get; set; }
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public int CompletedCards { get; set; }
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public List<CardProgressDto> Cards { get; set; } = new();
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}
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public class CardProgressDto
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{
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public Guid CardId { get; set; }
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public string Word { get; set; } = string.Empty;
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public List<string> PlannedTests { get; set; } = new();
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public int CompletedTestsCount { get; set; }
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public bool IsCompleted { get; set; }
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public List<TestProgressDto> Tests { get; set; } = new();
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}
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public class TestProgressDto
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{
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public string TestType { get; set; } = string.Empty;
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public bool IsCorrect { get; set; }
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public DateTime CompletedAt { get; set; }
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}
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public class ProgressSummaryDto
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{
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public int CurrentCardIndex { get; set; }
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public int TotalCards { get; set; }
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public int CompletedTests { get; set; }
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public int TotalTests { get; set; }
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public int CompletedCards { get; set; }
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}
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public class CardDto
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{
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public Guid Id { get; set; }
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public string Word { get; set; } = string.Empty;
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public string Translation { get; set; } = string.Empty;
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public string Definition { get; set; } = string.Empty;
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public string Example { get; set; } = string.Empty;
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public string ExampleTranslation { get; set; } = string.Empty;
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public string Pronunciation { get; set; } = string.Empty;
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public string DifficultyLevel { get; set; } = string.Empty;
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} |