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 FakeGradingKeyTemplates : IGradingKeyTemplateRepository
{
    private readonly List<GradingKeyTemplate> _all = [];
    public List<GradingKeyTemplate> GetAll() => _all;
    public List<GradingKeyTemplate> GetByGradingSystem(GradingSystem system) =>
        _all.Where(t => t.GradingSystem == system).ToList();
    public GradingKeyTemplate? GetById(Guid id) => _all.FirstOrDefault(t => t.Id == id);
    public void Save(GradingKeyTemplate template) { _all.RemoveAll(t => t.Id == template.Id); _all.Add(template); }
    public void Delete(Guid id) => _all.RemoveAll(t => t.Id == id);
}

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 FakeGroups(List<LearningGroup> all) : IGroupRepository
{
    public LearningGroup? GetById(Guid id) => all.FirstOrDefault(g => g.Id == id);
    public List<LearningGroup> GetAll(bool includeInactive = false) => all;
    public List<LearningGroup> GetBySchoolYear(string schoolYear, bool includeInactive = false) => all;
    public void Save(LearningGroup group) { }
    public void Delete(Guid id) { }
}

public class FakeDocumentation : IDocumentationRepository
{
    private readonly List<Documentation> _all = [];
    public void Add(Documentation d) => _all.Add(d);
    public List<Documentation> GetByStudent(Guid studentId) =>
        _all.Where(d => d.StudentId == studentId && !d.IsDeleted).ToList();
    public List<Documentation> GetByStudentAndType(Guid studentId, DocumentationType type) =>
        _all.Where(d => d.StudentId == studentId && d.Type == type && !d.IsDeleted).ToList();
    public List<Documentation> GetAll() => _all.Where(d => !d.IsDeleted).ToList();
    public void Save(Documentation doc) { _all.RemoveAll(d => d.Id == doc.Id); _all.Add(doc); }
    public void Delete(Guid id) { var d = _all.FirstOrDefault(x => x.Id == id); if (d is not null) d.IsDeleted = true; }
    public void HardDelete(Guid id) => _all.RemoveAll(d => d.Id == id);
}

public class FakeAttachmentStorage : IAttachmentStorage
{
    private readonly Dictionary<string, byte[]> _blobs = [];
    public string Upload(string fileName, Stream content)
    {
        using var ms = new MemoryStream();
        content.CopyTo(ms);
        var id = Guid.NewGuid().ToString("N");
        _blobs[id] = ms.ToArray();
        return id;
    }
    public Stream? OpenRead(string storageId) => _blobs.TryGetValue(storageId, out var b) ? new MemoryStream(b) : null;
    public void Delete(string storageId) => _blobs.Remove(storageId);
}

public class FakeUnits : IUnitRepository
{
    private readonly List<Unit> _all = [];
    public void Add(Unit u) => _all.Add(u);
    public Unit? GetById(Guid id) => _all.FirstOrDefault(u => u.Id == id);
    public List<Unit> GetByGroup(Guid groupId) =>
        _all.Where(u => u.GroupId == groupId).OrderBy(u => u.StartDate).ToList();
    public void Save(Unit unit) { _all.RemoveAll(u => u.Id == unit.Id); _all.Add(unit); }
    public void Delete(Guid id) => _all.RemoveAll(u => u.Id == id);
}

public class FakeLessons : ILessonRepository
{
    private readonly List<Lesson> _all = [];
    public void Add(Lesson l) => _all.Add(l);
    public List<Lesson> GetByUnit(Guid unitId) =>
        _all.Where(l => l.UnitId == unitId).OrderBy(l => l.Date).ThenBy(l => l.LessonNumber).ToList();
    public List<Lesson> GetByGroupAndDate(Guid groupId, DateOnly date) =>
        _all.Where(l => l.GroupId == groupId && l.Date == date).ToList();
    public List<Lesson> GetByGroupAndRange(Guid groupId, DateOnly from, DateOnly to) =>
        _all.Where(l => l.GroupId == groupId && l.Date >= from && l.Date <= to).OrderBy(l => l.Date).ToList();
    public void Save(Lesson lesson) { _all.RemoveAll(l => l.Id == lesson.Id); _all.Add(lesson); }
    public void Delete(Guid id) => _all.RemoveAll(l => l.Id == id);
}

public class FakeSubjects(List<Subject> all) : ISubjectRepository
{
    public List<Subject> GetAll() => all;
    public Subject? GetById(Guid id) => all.FirstOrDefault(s => s.Id == id);
    public Subject? GetByName(string name) => all.FirstOrDefault(s => s.Name == name);
    public void Save(Subject subject) { }
    public void Delete(Guid id) { }
}

public class FakeCompetencyDomains : ICompetencyDomainRepository
{
    public List<CompetencyDomain> GetBySubjectAndGrade(Guid subjectId, int gradeLevel) => [];
    public CompetencyDomain? GetById(Guid id) => null;
    public void Save(CompetencyDomain domain) { }
    public void Delete(Guid id) { }
    public void DeleteBySubjectAndGrade(Guid subjectId, int gradeLevel) { }
}

public class FakeShorthandCodes(List<ShorthandCode> all) : IShorthandCodeRepository
{
    public List<ShorthandCode> GetAll() => all;
    public void Save(ShorthandCode code) { }
    public void Delete(Guid id) { }
}

public class FakeAlternativeLessonPaths(List<AlternativeLessonPath> all) : IAlternativeLessonPathRepository
{
    public List<AlternativeLessonPath> GetAll() => all;
    public AlternativeLessonPath? GetById(Guid id) => all.FirstOrDefault(p => p.Id == id);
    public void Save(AlternativeLessonPath path) { all.RemoveAll(p => p.Id == path.Id); all.Add(path); }
    public void Delete(Guid id) => all.RemoveAll(p => p.Id == id);
}

public class FakeTimetableSlots : ITimetableSlotRepository
{
    private readonly List<TimetableSlot> _all = [];
    public void Add(TimetableSlot s) => _all.Add(s);
    public List<TimetableSlot> GetAll() => _all.ToList();
    public List<TimetableSlot> GetByGroup(Guid groupId) => _all.Where(s => s.GroupId == groupId).ToList();
    public void Save(TimetableSlot slot)
    {
        var occupied = _all.FirstOrDefault(s => s.Weekday == slot.Weekday && s.PeriodNumber == slot.PeriodNumber);
        if (occupied is not null && occupied.Id != slot.Id)
            throw new InvalidOperationException("Diese Stunde ist bereits belegt.");
        _all.RemoveAll(s => s.Id == slot.Id);
        _all.Add(slot);
    }
    public void Delete(Guid id) => _all.RemoveAll(s => s.Id == id);
}

public class FakeSchoolHolidays : ISchoolHolidayRepository
{
    private readonly List<SchoolHoliday> _all = [];
    public void Add(SchoolHoliday h) => _all.Add(h);
    public List<SchoolHoliday> GetAll() => _all.ToList();
    public void Save(SchoolHoliday holiday) { _all.RemoveAll(h => h.Id == holiday.Id); _all.Add(holiday); }
    public void Delete(Guid id) => _all.RemoveAll(h => h.Id == id);
}

public class FakeSupervisionDuties : ISupervisionDutyRepository
{
    private readonly List<SupervisionDuty> _all = [];
    public void Add(SupervisionDuty d) => _all.Add(d);
    public List<SupervisionDuty> GetAll() => _all.ToList();
    public void Save(SupervisionDuty duty)
    {
        var occupied = _all.FirstOrDefault(d => d.Weekday == duty.Weekday && d.AfterPeriod == duty.AfterPeriod);
        if (occupied is not null && occupied.Id != duty.Id)
            throw new InvalidOperationException("Für diese Pause ist bereits eine Aufsicht eingetragen.");
        _all.RemoveAll(d => d.Id == duty.Id);
        _all.Add(duty);
    }
    public void Delete(Guid id) => _all.RemoveAll(d => d.Id == id);
}

public class FakeSubstitutionEntries : ISubstitutionEntryRepository
{
    private readonly List<SubstitutionEntry> _all = [];
    public void Add(SubstitutionEntry e) => _all.Add(e);
    public List<SubstitutionEntry> GetAll() => _all.ToList();
    public List<SubstitutionEntry> GetByDate(DateOnly date) => _all.Where(e => e.Date == date).ToList();
    public void Save(SubstitutionEntry entry) { _all.RemoveAll(e => e.Id == entry.Id); _all.Add(entry); }
    public void Delete(Guid id) => _all.RemoveAll(e => e.Id == 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);
}