using LehrerApp.Core.Interfaces;
using LehrerApp.Core.Models;

namespace LehrerApp.Desktop.Tests;

// Einfache In-Memory-Fakes der Repository-Schnittstellen, damit ViewModel-Tests ohne echte
// LiteDB-Anbindung laufen. Bewusst schlank gehalten: nur was die getesteten ViewModels brauchen.

public class FakeStudents(List<Student> all) : IStudentRepository
{
    public Student? GetById(Guid id) => all.FirstOrDefault(s => s.Id == id);
    public List<Student> GetAll(bool includeInactive = false) => all;
    public List<Student> GetByGroup(Guid groupId) => all;
    public void Save(Student student) { }
    public void Delete(Guid id) { }
}

public class FakeMemberships(List<GroupMembership> all) : IGroupMembershipRepository
{
    public List<GroupMembership> GetByStudent(Guid studentId) => all.Where(m => m.StudentId == studentId).ToList();
    public List<GroupMembership> GetByGroup(Guid groupId) => all.Where(m => m.GroupId == groupId).ToList();
    public GroupMembership? GetByStudentAndGroup(Guid studentId, Guid groupId) =>
        all.FirstOrDefault(m => m.StudentId == studentId && m.GroupId == groupId);
    public void Save(GroupMembership membership) { }
    public void Delete(Guid id) { }
}

public class FakeSessions(List<ParticipationSession> all) : IParticipationSessionRepository
{
    public List<ParticipationSession> GetByGroup(Guid groupId) => all.Where(s => s.GroupId == groupId).ToList();
    public ParticipationSession? GetById(Guid id) => all.FirstOrDefault(s => s.Id == id);
    public void Save(ParticipationSession session) { }
    public void Delete(Guid id) { }
}

public class FakeEntries : IParticipationRepository
{
    private readonly List<ParticipationEntry> _all = [];
    public void Add(ParticipationEntry e) => _all.Add(e);
    public List<ParticipationEntry> GetBySession(Guid sessionId) => _all.Where(e => e.SessionId == sessionId).ToList();
    public List<ParticipationEntry> GetByStudent(Guid studentId) => _all.Where(e => e.StudentId == studentId).ToList();
    public ParticipationEntry? GetBySessionAndStudent(Guid sessionId, Guid studentId) =>
        _all.FirstOrDefault(e => e.SessionId == sessionId && e.StudentId == studentId);
    public void Save(ParticipationEntry entry)
    {
        _all.RemoveAll(e => e.Id == entry.Id);
        _all.Add(entry);
    }
    public void SaveMany(List<ParticipationEntry> entries) { foreach (var e in entries) Save(e); }
    public void DeleteBySession(Guid sessionId) => _all.RemoveAll(e => e.SessionId == sessionId);
}

public class FakeAspects : IParticipationAspectRepository
{
    public List<ParticipationAspect> GetDefaults() => [];
    public List<ParticipationAspect> GetByGroup(Guid groupId) => [];
    public void Save(ParticipationAspect aspect) { }
    public void Delete(Guid id) { }
}

public class FakeGrades : IGradeRepository
{
    private readonly List<Grade> _all = [];
    public void Add(Grade g) => _all.Add(g);
    public List<Grade> GetByStudentAndGroup(Guid studentId, Guid groupId) =>
        _all.Where(g => g.StudentId == studentId && g.GroupId == groupId).ToList();
    public List<Grade> GetByGroup(Guid groupId) => _all.Where(g => g.GroupId == groupId).ToList();
    public void Save(Grade grade)
    {
        _all.RemoveAll(g => g.Id == grade.Id);
        _all.Add(grade);
    }
    public void Delete(Guid id) => _all.RemoveAll(g => g.Id == id);
}

public class FakeExams(List<Exam> all) : IExamRepository
{
    public Exam? GetById(Guid id) => all.FirstOrDefault(e => e.Id == id);
    public List<Exam> GetByGroup(Guid groupId) => all.Where(e => e.GroupId == groupId).ToList();
    public void Save(Exam exam) { }
    public void Delete(Guid id) { }
}

public class FakeResults : IExamResultRepository
{
    private readonly List<ExamResult> _all = [];
    // Upsert-Semantik nach ExamId+StudentId, wie der reale unique Index es erzwingt.
    public void Add(ExamResult r)
    {
        _all.RemoveAll(x => x.ExamId == r.ExamId && x.StudentId == r.StudentId);
        _all.Add(r);
    }
    public List<ExamResult> GetByExam(Guid examId) => _all.Where(r => r.ExamId == examId).ToList();
    public List<ExamResult> GetByStudent(Guid studentId) => _all.Where(r => r.StudentId == studentId).ToList();
    public ExamResult? GetByExamAndStudent(Guid examId, Guid studentId) =>
        _all.FirstOrDefault(r => r.ExamId == examId && r.StudentId == studentId);
    public void Save(ExamResult result) { }
    public void SaveMany(List<ExamResult> results) { }
}

public class FakeSchemes : IGradingSchemeRepository
{
    private readonly Dictionary<Guid, GradingScheme> _byGroup = [];
    private readonly Dictionary<GroupType, GradingScheme> _byType = [];
    public void SetForGroup(Guid groupId, GradingScheme s) => _byGroup[groupId] = s;
    public void SetDefault(GroupType type, GradingScheme s) => _byType[type] = s;
    public GradingScheme? GetByGroup(Guid groupId) => _byGroup.GetValueOrDefault(groupId);
    public GradingScheme? GetDefaultForType(GroupType type) => _byType.GetValueOrDefault(type);
    public void Save(GradingScheme scheme) { }
    public void Delete(Guid id) { }
}

public class FakeReportGrades : IReportGradeRepository
{
    private readonly List<ReportGrade> _all = [];
    public int SavedCount { get; private set; }
    public List<ReportGrade> GetByGroup(Guid groupId) => _all.Where(r => r.GroupId == groupId).ToList();
    public ReportGrade? GetByStudentGroupPeriod(Guid studentId, Guid groupId, string period) =>
        _all.FirstOrDefault(r => r.StudentId == studentId && r.GroupId == groupId && r.Period == period);
    public void Save(ReportGrade grade)
    {
        _all.RemoveAll(r => r.Id == grade.Id);
        _all.Add(grade);
        SavedCount++;
    }
    public void Delete(Guid id) => _all.RemoveAll(r => r.Id == id);
}