DeutschLernen/GermanApp/Infrastructure/Data/Repositories/QuizRepository.cs

using GermanApp.Domain.Entities;
using GermanApp.Domain.Interfaces;
using GermanApp.Infrastructure.Data.DbContext;
using Microsoft.EntityFrameworkCore;

namespace GermanApp.Infrastructure.Data.Repositories;

/// <summary>
/// Entity Framework Core implementation of IQuizRepository.
/// This is part of the Infrastructure layer.
/// </summary>
public class QuizRepository : IQuizRepository
{
    private readonly AppDbContext _context;

    public QuizRepository(AppDbContext context)
    {
        _context = context;
    }

    public async Task<Quiz?> GetByIdAsync(int id, CancellationToken cancellationToken = default)
    {
        return await _context.Quizzes
            .Include(q => q.Lesson)
            .FirstOrDefaultAsync(q => q.Id == id, cancellationToken);
    }

    public async Task<IReadOnlyList<Quiz>> GetAllAsync(CancellationToken cancellationToken = default)
    {
        return await _context.Quizzes
            .Include(q => q.Lesson)
            .AsNoTracking()
            .ToListAsync(cancellationToken);
    }

    public async Task<Quiz> AddAsync(Quiz entity, CancellationToken cancellationToken = default)
    {
        await _context.Quizzes.AddAsync(entity, cancellationToken);
        await _context.SaveChangesAsync(cancellationToken);
        return entity;
    }

    public async Task UpdateAsync(Quiz entity, CancellationToken cancellationToken = default)
    {
        _context.Quizzes.Update(entity);
        await _context.SaveChangesAsync(cancellationToken);
    }

    public async Task DeleteAsync(Quiz entity, CancellationToken cancellationToken = default)
    {
        _context.Quizzes.Remove(entity);
        await _context.SaveChangesAsync(cancellationToken);
    }

    public async Task<bool> ExistsAsync(int id, CancellationToken cancellationToken = default)
    {
        return await _context.Quizzes
            .AnyAsync(q => q.Id == id, cancellationToken);
    }

    public async Task<IReadOnlyList<Quiz>> GetByLessonAsync(int lessonId, CancellationToken cancellationToken = default)
    {
        return await _context.Quizzes
            .Include(q => q.Lesson)
            .Where(q => q.LessonId == lessonId)
            .OrderBy(q => q.Id)
            .AsNoTracking()
            .ToListAsync(cancellationToken);
    }

    public async Task<IReadOnlyList<Quiz>> GetAllOrderedAsync(CancellationToken cancellationToken = default)
    {
        return await _context.Quizzes
            .Include(q => q.Lesson)
            .OrderBy(q => q.Lesson.Order)
            .ThenBy(q => q.Id)
            .AsNoTracking()
            .ToListAsync(cancellationToken);
    }

    public async Task<IReadOnlyList<Quiz>> GetActiveByLessonAsync(int lessonId, CancellationToken cancellationToken = default)
    {
        return await _context.Quizzes
            .Include(q => q.Lesson)
            .Where(q => q.LessonId == lessonId && q.IsActive)
            .OrderBy(q => q.Id)
            .AsNoTracking()
            .ToListAsync(cancellationToken);
    }

    public async Task<Quiz?> GetWithQuestionsAsync(int id, CancellationToken cancellationToken = default)
    {
        return await _context.Quizzes
            .Include(q => q.Lesson)
            .Include(q => q.Questions.OrderBy(qq => qq.Order))
            .ThenInclude(qq => qq.Options.OrderBy(o => o.Order))
            .FirstOrDefaultAsync(q => q.Id == id, cancellationToken);
    }

    public async Task<Quiz?> GetFirstByLessonAsync(int lessonId, CancellationToken cancellationToken = default)
    {
        return await _context.Quizzes
            .Include(q => q.Lesson)
            .Where(q => q.LessonId == lessonId && q.IsActive)
            .OrderBy(q => q.Id)
            .FirstOrDefaultAsync(cancellationToken);
    }

    public async Task<bool> ExistsByLessonAsync(int lessonId, CancellationToken cancellationToken = default)
    {
        return await _context.Quizzes
            .AnyAsync(q => q.LessonId == lessonId, cancellationToken);
    }
}