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

namespace LehrerApp.Desktop.Tests;

public sealed class GroupDetailViewModelTests
{
    private static (GroupDetailViewModel Vm, FakeExams Exams, FakeWorkTasks Tasks) Build(LearningGroup group, Exam exam)
    {
        var exams = new FakeExams([exam]);
        var tasks = new FakeWorkTasks();
        var groups = new FakeGroups([group]);
        var students = new FakeStudents([]);
        var memberships = new FakeMemberships([]);
        var subjects = new FakeSubjects([]);
        var grades = new FakeGrades();

        var vm = new GroupDetailViewModel(groups, students, memberships, subjects, exams, grades, tasks,
            new ParticipationTabViewModel(new FakeSessions([]), new FakeEntries(), new FakeAspects(),
                students, memberships, groups, new FakeCompetencyDomains()),
            new GradeOverviewTabViewModel(grades, exams, new FakeResults(), students, memberships, new GradingService()),
            new PlanningTabViewModel(new FakeUnits(), new FakeLessons(), groups, subjects,
                new FakeCompetencyDomains(), TestSupport.BuildAiSettingsService(), new FakeSessions([])),
            new CompetencyOverviewTabViewModel(new FakeUnits(), exams, new FakeResults(),
                new FakeCompetencyDomains(), students, new CompetencyAnalysisService()),
            new SeatingPlanTabViewModel(new FakeSeatingPlans(), students, memberships,
                new FakeSessions([]), new FakeEntries(), new FakeAspects()),
            new GroupDocumentationTabViewModel(new FakeDocumentation(), students, groups));

        vm.LoadGroup(group.Id);
        vm.SelectedExam = vm.Exams.First(e => e.Id == exam.Id);
        return (vm, exams, tasks);
    }

    [Fact]
    public void SetExamStatus_PlannedZuConducted_ErstelltKorrekturAufgabe()
    {
        var group = new LearningGroup { Name = "8a", SchoolYear = "2025/26" };
        var exam = new Exam { GroupId = group.Id, Title = "Klausur 1", Date = new DateOnly(2026, 3, 10) };
        var (vm, _, tasks) = Build(group, exam);

        vm.SetExamStatusCommand.Execute(ExamStatus.Conducted);

        var task = Assert.Single(tasks.GetAll());
        Assert.Equal("Klausur korrigieren: Klausur 1", task.Title);
        Assert.Equal(TaskCategory.Correction, task.Category);
        Assert.Equal(group.Id, task.GroupId);
        Assert.Equal(new DateOnly(2026, 3, 24), task.DueDate);
    }

    [Fact]
    public void SetExamStatus_ConductedErneutGesetzt_ErstelltKeineZweiteAufgabe()
    {
        var group = new LearningGroup { Name = "8a", SchoolYear = "2025/26" };
        var exam = new Exam { GroupId = group.Id, Title = "Klausur 1", Date = new DateOnly(2026, 3, 10) };
        var (vm, _, tasks) = Build(group, exam);

        vm.SetExamStatusCommand.Execute(ExamStatus.Conducted);
        vm.SelectedExam = vm.Exams.First(e => e.Id == exam.Id);
        vm.SetExamStatusCommand.Execute(ExamStatus.Conducted);

        Assert.Single(tasks.GetAll());
    }

    [Fact]
    public void SetExamStatus_DirektAufGraded_ErstelltKeineAufgabe()
    {
        var group = new LearningGroup { Name = "8a", SchoolYear = "2025/26" };
        var exam = new Exam { GroupId = group.Id, Title = "Klausur 1", Date = new DateOnly(2026, 3, 10) };
        var (vm, _, tasks) = Build(group, exam);

        vm.SetExamStatusCommand.Execute(ExamStatus.Graded);

        Assert.Empty(tasks.GetAll());
    }
}