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

namespace LehrerApp.Desktop.Tests;

/// Tests für den Schnellüberblick im Auswahl-Panel der Gruppenliste (Nutzer-Feedback:
/// "oberhalb der Buttonliste ein paar Daten auswerfen. Nächste Stunde, nächste Arbeit,
/// wichtige Todos").
public sealed class GroupListViewModelTests
{
    private static GroupListViewModel BuildVm(LearningGroup group, FakeLessons? lessons = null,
        FakeExams? exams = null, FakeWorkTasks? tasks = null) =>
        new(new FakeGroups([group]), new FakeSubjects([]), new SchoolYearService(),
            lessons ?? new FakeLessons(), exams ?? new FakeExams([]), tasks ?? new FakeWorkTasks());

    [Fact]
    public void SelectedGroup_OhneDatenZeigtKeinenSchnellueberblick()
    {
        var group = new LearningGroup { Name = "9c" };
        var vm = BuildVm(group);

        vm.SelectedGroup = vm.Groups.Count > 0 ? vm.Groups[0] : new GroupListItem(group, "");

        Assert.False(vm.QuickHasAnything);
    }

    [Fact]
    public void SelectedGroup_ZeigtNaechsteGeplanteStundeUndKlausur()
    {
        var group = new LearningGroup { Name = "9c" };
        var today = DateOnly.FromDateTime(DateTime.Today);
        var lessons = new FakeLessons();
        lessons.Add(new Lesson { GroupId = group.Id, Date = today.AddDays(3), Topic = "Redox", Status = LessonStatus.Planned });
        var exams = new FakeExams([new Exam { GroupId = group.Id, Date = today.AddDays(10), Title = "Klausur 1" }]);
        var vm = BuildVm(group, lessons: lessons, exams: exams);

        vm.SelectedGroup = new GroupListItem(group, "");

        Assert.True(vm.QuickHasNextLesson);
        Assert.Contains("Redox", vm.QuickNextLessonLabel);
        Assert.True(vm.QuickHasNextExam);
        Assert.Contains("Klausur 1", vm.QuickNextExamLabel);
        Assert.True(vm.QuickHasAnything);
    }

    [Fact]
    public void SelectedGroup_ZeigtOffeneAufgabenDieserGruppeSortiertNachFaelligkeit()
    {
        var group = new LearningGroup { Name = "9c" };
        var today = DateOnly.FromDateTime(DateTime.Today);
        var tasks = new FakeWorkTasks();
        tasks.Add(new WorkTask { GroupId = group.Id, Title = "Bald fällig", DueDate = today.AddDays(1), Status = WorkTaskStatus.Open });
        tasks.Add(new WorkTask { GroupId = group.Id, Title = "Erledigt", DueDate = today, Status = WorkTaskStatus.Done });
        tasks.Add(new WorkTask { GroupId = Guid.NewGuid(), Title = "Andere Gruppe", DueDate = today, Status = WorkTaskStatus.Open });
        var vm = BuildVm(group, tasks: tasks);

        vm.SelectedGroup = new GroupListItem(group, "");

        Assert.True(vm.QuickHasTasks);
        Assert.Equal("Bald fällig", Assert.Single(vm.QuickTasks).Title);
    }

    [Fact]
    public void SelectedGroup_Zuruecksetzen_LeertSchnellueberblick()
    {
        var group = new LearningGroup { Name = "9c" };
        var today = DateOnly.FromDateTime(DateTime.Today);
        var exams = new FakeExams([new Exam { GroupId = group.Id, Date = today.AddDays(10), Title = "Klausur 1" }]);
        var vm = BuildVm(group, exams: exams);
        vm.SelectedGroup = new GroupListItem(group, "");
        Assert.True(vm.QuickHasAnything);

        vm.SelectedGroup = null;

        Assert.False(vm.QuickHasAnything);
        Assert.Empty(vm.QuickTasks);
    }
}