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

namespace LehrerApp.Desktop.Tests;

public sealed class SettingsViewModelTests
{
    private static SettingsViewModel BuildViewModel(FakeSchoolHolidays? holidays = null)
    {
        // Bewusst kein "using": SchoolCalendarSettingsService liest den Pfad erst bei SetState,
        // das Verzeichnis muss über die Lebensdauer des ViewModels bestehen bleiben.
        var tempPath = System.IO.Path.Combine(
            System.IO.Path.GetTempPath(), $"lehrerapp-settingsvm-tests-{Guid.NewGuid():N}");
        Directory.CreateDirectory(tempPath);

        return new SettingsViewModel(
            new FakeSubjects([]), new FakeCompetencyDomains(), new FakeGradingKeyTemplates(),
            new FakeSchemes(), new GradingService(), new BackupService(tempPath),
            new DatabaseEncryptionService(), new AppLockService(tempPath),
            new LiteDbContext(new MemoryStream()), new PrivacySettingsService(tempPath),
            new FakeDocumentation(), new FakeStudents([]), new FakeShorthandCodes([]),
            holidays ?? new FakeSchoolHolidays(), new SchoolCalendarSettingsService(tempPath));
    }

    [Fact]
    public void AddSchoolHoliday_GueltigeEingabe_WirdGespeichertUndInListeAngezeigt()
    {
        var holidays = new FakeSchoolHolidays();
        var vm = BuildViewModel(holidays);
        vm.NewHolidayName = "Sommerferien";
        vm.NewHolidayStartText = "01.07.2026";
        vm.NewHolidayEndText = "10.08.2026";

        vm.AddSchoolHolidayCommand.Execute(null);

        Assert.Single(holidays.GetAll());
        Assert.Single(vm.SchoolHolidayEntries);
    }

    [Fact]
    public void AddSchoolHoliday_EndeVorBeginn_SetztFehlerUndSpeichertNicht()
    {
        var holidays = new FakeSchoolHolidays();
        var vm = BuildViewModel(holidays);
        vm.NewHolidayName = "Ungültig";
        vm.NewHolidayStartText = "10.08.2026";
        vm.NewHolidayEndText = "01.07.2026";

        vm.AddSchoolHolidayCommand.Execute(null);

        Assert.Empty(holidays.GetAll());
        Assert.NotEqual("", vm.HolidayDateError);
    }

    [Fact]
    public void AddSchoolHoliday_FehlenderName_SetztFehlerUndSpeichertNicht()
    {
        var holidays = new FakeSchoolHolidays();
        var vm = BuildViewModel(holidays);
        vm.NewHolidayStartText = "01.07.2026";
        vm.NewHolidayEndText = "10.08.2026";

        vm.AddSchoolHolidayCommand.Execute(null);

        Assert.Empty(holidays.GetAll());
        Assert.NotEqual("", vm.HolidayNameError);
    }

    [Fact]
    public void RemoveSchoolHoliday_EntferntEintragAusRepositoryUndListe()
    {
        var holidays = new FakeSchoolHolidays();
        var holiday = new SchoolHoliday { Name = "Herbstferien", StartDate = new DateOnly(2026, 10, 12), EndDate = new DateOnly(2026, 10, 24) };
        holidays.Add(holiday);
        var vm = BuildViewModel(holidays);

        vm.RemoveSchoolHolidayCommand.Execute(vm.SchoolHolidayEntries[0]);

        Assert.Empty(holidays.GetAll());
        Assert.Empty(vm.SchoolHolidayEntries);
    }

    [Fact]
    public void SelectedStateName_Aendern_PersistiertUeberSchoolCalendarSettings()
    {
        var tempPath = System.IO.Path.Combine(
            System.IO.Path.GetTempPath(), $"lehrerapp-settingsvm-state-tests-{Guid.NewGuid():N}");
        Directory.CreateDirectory(tempPath);
        var calendarSettings = new SchoolCalendarSettingsService(tempPath);

        var vm = new SettingsViewModel(
            new FakeSubjects([]), new FakeCompetencyDomains(), new FakeGradingKeyTemplates(),
            new FakeSchemes(), new GradingService(), new BackupService(tempPath),
            new DatabaseEncryptionService(), new AppLockService(tempPath),
            new LiteDbContext(new MemoryStream()), new PrivacySettingsService(tempPath),
            new FakeDocumentation(), new FakeStudents([]), new FakeShorthandCodes([]),
            new FakeSchoolHolidays(), calendarSettings);

        vm.SelectedStateName = "Bayern";

        Assert.Equal(GermanState.BY, calendarSettings.State);
    }
}