using LehrerApp.Core.Models;
using LehrerApp.Desktop.ViewModels.Groups;
using Xunit;

namespace LehrerApp.Desktop.Tests;

public sealed class TeachingModeViewModelTests
{
    private static SeatingPlanTabViewModel BuildSeatingPlan(Guid groupId, FakeSessions? sessions = null,
        List<Student>? students = null, List<GroupMembership>? memberships = null,
        List<SeatingPlan>? plans = null) =>
        new(new FakeSeatingPlans(plans ?? [new SeatingPlan { GroupId = groupId, Name = "Standard", Rows = 1, Columns = 1 }]),
            new FakeStudents(students ?? []), new FakeMemberships(memberships ?? []),
            sessions ?? new FakeSessions([]), new FakeEntries(), new FakeAspects());

    [Fact]
    public void Konstruktor_LaedtVerlaufsplanUndInitialisiertSitzplanFuerDieGruppe()
    {
        var group = new LearningGroup { Name = "Q1 Chemie" };
        var lesson = new Lesson
        {
            GroupId = group.Id, Date = DateOnly.FromDateTime(DateTime.Today), Topic = "Redox",
            Phases = [new LessonPhaseStep { Name = "Einstieg", DurationMinutes = 10, Activity = "Impuls" }],
        };
        var seatingPlan = BuildSeatingPlan(group.Id);

        var vm = new TeachingModeViewModel(lesson, group, new FakeAlternativeLessonPaths([]), seatingPlan);

        Assert.Equal("Q1 Chemie", vm.GroupName);
        Assert.Equal("Redox", vm.LessonInfo.Topic);
        Assert.Single(vm.LessonInfo.PhaseGroups.Single().Phases);
        Assert.True(vm.SeatingPlan.HasSelectedPlan);
    }

    [Fact]
    public void Konstruktor_VerknuepftDieSitzungMitDieserStunde()
    {
        var group = new LearningGroup { Name = "Q1 Chemie" };
        var lesson = new Lesson
        { GroupId = group.Id, Date = DateOnly.FromDateTime(DateTime.Today), Topic = "Redox" };
        var sessions = new FakeSessions([]);
        var seatingPlan = BuildSeatingPlan(group.Id, sessions);

        var vm = new TeachingModeViewModel(lesson, group, new FakeAlternativeLessonPaths([]), seatingPlan);

        var created = Assert.Single(sessions.GetByGroup(group.Id));
        Assert.Equal(lesson.Id, created.LessonId);
        Assert.Equal(vm.SeatingPlan.SelectedSession?.Id, created.Id);
    }

    [Fact]
    public void Konstruktor_BereitsExistierendeVerknuepfteSitzung_WirdWiederverwendet()
    {
        var group = new LearningGroup { Name = "Q1 Chemie" };
        var lesson = new Lesson
        { GroupId = group.Id, Date = DateOnly.FromDateTime(DateTime.Today), Topic = "Redox" };
        var existing = new ParticipationSession
        { GroupId = group.Id, Date = lesson.Date, LessonId = lesson.Id, Comment = "Redox" };
        var sessions = new FakeSessions([existing]);
        var seatingPlan = BuildSeatingPlan(group.Id, sessions);

        var vm = new TeachingModeViewModel(lesson, group, new FakeAlternativeLessonPaths([]), seatingPlan);

        Assert.Single(sessions.GetByGroup(group.Id));
        Assert.Equal(existing.Id, vm.SeatingPlan.SelectedSession?.Id);
    }

    /// Eine archivierte Gruppe darf im Unterrichtsmodus nicht bearbeitbar sein - genau wie in der
    /// normalen Gruppenansicht (GroupDetailViewModel.IsReadOnly).
    [Fact]
    public void Konstruktor_ArchivierteGruppe_InitialisiertSitzplanSchreibgeschuetzt()
    {
        var group = new LearningGroup { Name = "Q1 Chemie", IsActive = false };
        var lesson = new Lesson
        { GroupId = group.Id, Date = DateOnly.FromDateTime(DateTime.Today), Topic = "Redox" };
        var seatingPlan = BuildSeatingPlan(group.Id);

        var vm = new TeachingModeViewModel(lesson, group, new FakeAlternativeLessonPaths([]), seatingPlan);

        Assert.False(vm.SeatingPlan.IsEditable);
    }
}