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

namespace LehrerApp.Desktop.Tests;

/// Tests für 9.1 (heutige Stunden mit Uhrzeit und Raum im Dashboard) und 9.2 (Absprung von einer
/// Stunde). Deckt nur die neue Zeit-/Raum-Auflösung ab, nicht die übrigen, unveränderten
/// Dashboard-Bausteine (Kalender, offene Aufgaben, Fehlzeiten-Warnungen, ...).
public sealed class DashboardViewModelTests
{
    private static PeriodScheduleService NewPeriodSchedule()
    {
        var tempPath = System.IO.Path.Combine(
            System.IO.Path.GetTempPath(), $"lehrerapp-dashboardvm-tests-{Guid.NewGuid():N}");
        Directory.CreateDirectory(tempPath);
        return new PeriodScheduleService(tempPath);
    }

    private static DashboardViewModel BuildVm(LearningGroup group, Lesson lesson,
        FakeTimetableSlots? slots = null, PeriodScheduleService? periodSchedule = null)
    {
        var lessons = new FakeLessons();
        lessons.Add(lesson);
        return new DashboardViewModel(
            new FakeGroups([group]), new FakeSubjects([]), lessons,
            new FakeExams([]), new FakeWorkTasks(), new FakeSessions([]), new FakeEntries(),
            new FakeStudents([]), new FakeDocumentation(),
            slots ?? new FakeTimetableSlots(), periodSchedule ?? NewPeriodSchedule(),
            new AttendanceBalanceService(), new SchoolYearService());
    }

    [Fact]
    public void TodaysLessons_LoestRaumUeberPassendenStundenplanSlotAuf()
    {
        var group = new LearningGroup { Name = "9c" };
        var today = DateOnly.FromDateTime(DateTime.Today);
        var lesson = new Lesson { GroupId = group.Id, Date = today, LessonNumber = 3, Topic = "Redox" };
        var slots = new FakeTimetableSlots();
        slots.Add(new TimetableSlot { GroupId = group.Id, Weekday = today.DayOfWeek, PeriodNumber = 3, Room = "R204" });

        var vm = BuildVm(group, lesson, slots: slots);

        var item = Assert.Single(vm.TodaysLessons);
        Assert.Equal("R204", item.Room);
        Assert.True(item.HasRoom);
    }

    [Fact]
    public void TodaysLessons_OhnePassendenSlot_HatKeinenRaum()
    {
        var group = new LearningGroup { Name = "9c" };
        var today = DateOnly.FromDateTime(DateTime.Today);
        var lesson = new Lesson { GroupId = group.Id, Date = today, LessonNumber = 3, Topic = "Redox" };

        var vm = BuildVm(group, lesson);

        var item = Assert.Single(vm.TodaysLessons);
        Assert.False(item.HasRoom);
        Assert.Equal("", item.Room);
    }

    [Fact]
    public void TodaysLessons_ZeitKommtAusLessonStartTimeWennGesetzt()
    {
        var group = new LearningGroup { Name = "9c" };
        var today = DateOnly.FromDateTime(DateTime.Today);
        var lesson = new Lesson
        {
            GroupId = group.Id, Date = today, LessonNumber = 3, Topic = "Redox",
            StartTime = new TimeOnly(9, 15),
        };
        var periodSchedule = NewPeriodSchedule();
        periodSchedule.SetPeriods([new PeriodTimeEntry { PeriodNumber = 3, Start = new TimeOnly(10, 0), End = new TimeOnly(10, 45) }]);

        var vm = BuildVm(group, lesson, periodSchedule: periodSchedule);

        Assert.Equal("09:15", Assert.Single(vm.TodaysLessons).TimeDisplay);
    }

    [Fact]
    public void TodaysLessons_OhneStartTime_FaelltAufStundenrasterZurueck()
    {
        var group = new LearningGroup { Name = "9c" };
        var today = DateOnly.FromDateTime(DateTime.Today);
        var lesson = new Lesson { GroupId = group.Id, Date = today, LessonNumber = 3, Topic = "Redox" };
        var periodSchedule = NewPeriodSchedule();
        periodSchedule.SetPeriods([new PeriodTimeEntry { PeriodNumber = 3, Start = new TimeOnly(10, 0), End = new TimeOnly(10, 45) }]);

        var vm = BuildVm(group, lesson, periodSchedule: periodSchedule);

        Assert.Equal("10:00", Assert.Single(vm.TodaysLessons).TimeDisplay);
    }

    [Fact]
    public void OpenLesson_RuftNavigationMitGruppenIdAuf()
    {
        var group = new LearningGroup { Name = "9c" };
        var today = DateOnly.FromDateTime(DateTime.Today);
        var lesson = new Lesson { GroupId = group.Id, Date = today, LessonNumber = 3, Topic = "Redox" };
        var vm = BuildVm(group, lesson);

        Guid? navigatedTo = null;
        vm.OnNavigateToLesson = id => navigatedTo = id;

        vm.OpenLessonCommand.Execute(vm.TodaysLessons[0]);

        Assert.Equal(group.Id, navigatedTo);
    }
}