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

namespace LehrerApp.Desktop.Tests;

public sealed class ParticipationSessionEditingTests
{
    [Fact]
    public void Bearbeitungsdialog_AendertBestehendeSessionOhneVerknuepfungenZuErsetzen()
    {
        var session = new ParticipationSession
        {
            GroupId = Guid.NewGuid(),
            Date = new DateOnly(2026, 8, 19),
            Comment = "Sitzplan",
            LessonId = Guid.NewGuid(),
            CompetencyCodes = ["K1"],
        };
        var vm = new AddSessionDialogViewModel(session)
        {
            DateText = "20.08.2026",
            Comment = "Elektrische Stromkreise",
        };

        vm.SaveCommand.Execute(null);

        Assert.Same(session, vm.Result);
        Assert.Equal(new DateOnly(2026, 8, 20), session.Date);
        Assert.Equal("Elektrische Stromkreise", session.Comment);
        Assert.NotNull(session.LessonId);
        Assert.Equal(["K1"], session.CompetencyCodes);
    }

    [Fact]
    public async Task BearbeitenBefehl_SpeichertSessionUndAktualisiertAnzeige()
    {
        var group = new LearningGroup { Name = "8a", SchoolYear = "2026/27" };
        var session = new ParticipationSession
        {
            GroupId = group.Id,
            Date = new DateOnly(2026, 8, 19),
            Comment = "Sitzplan",
        };
        var sessions = new FakeSessions([session]);
        var vm = new ParticipationTabViewModel(
            sessions, new FakeEntries(), new FakeAspects(), new FakeStudents([]),
            new FakeMemberships([]), new FakeGroups([group]), new FakeCompetencyDomains());
        vm.OnEditSession = existing =>
        {
            existing.Comment = "Nachbesprechung Elektrizität";
            return Task.FromResult<ParticipationSession?>(existing);
        };
        vm.Initialize(group.Id, group.SchoolYear);

        await vm.EditSessionCommand.ExecuteAsync(null);

        Assert.Equal(session.Id, vm.SelectedSession?.Id);
        Assert.Equal("Nachbesprechung Elektrizität", sessions.GetById(session.Id)?.Comment);
        Assert.Contains("Nachbesprechung Elektrizität", vm.SelectedSessionDisplay);
    }

    [Fact]
    public async Task LoeschenBefehl_FragtBestaetigungAbUndEntferntSessionMitsamtBewertungen()
    {
        var group = new LearningGroup { Name = "8a", SchoolYear = "2026/27" };
        var session = new ParticipationSession { GroupId = group.Id, Date = new DateOnly(2026, 8, 19) };
        var sessions = new FakeSessions([session]);
        var entries = new FakeEntries();
        entries.Add(new ParticipationEntry { SessionId = session.Id, StudentId = Guid.NewGuid() });
        var vm = new ParticipationTabViewModel(
            sessions, entries, new FakeAspects(), new FakeStudents([]),
            new FakeMemberships([]), new FakeGroups([group]), new FakeCompetencyDomains());
        vm.Initialize(group.Id, group.SchoolYear);
        vm.SelectedSession = vm.Sessions.Single(s => s.Id == session.Id);

        int? passedEntryCount = null;
        vm.OnConfirmDeleteSession = (_, count) =>
        {
            passedEntryCount = count;
            return Task.FromResult(true);
        };

        await vm.DeleteSessionCommand.ExecuteAsync(null);

        Assert.Equal(1, passedEntryCount);
        Assert.Null(sessions.GetById(session.Id));
    }

    [Fact]
    public async Task LoeschenBefehl_BrichtBeiAbgelehnterBestaetigungAb()
    {
        var group = new LearningGroup { Name = "8a", SchoolYear = "2026/27" };
        var session = new ParticipationSession { GroupId = group.Id, Date = new DateOnly(2026, 8, 19) };
        var sessions = new FakeSessions([session]);
        var vm = new ParticipationTabViewModel(
            sessions, new FakeEntries(), new FakeAspects(), new FakeStudents([]),
            new FakeMemberships([]), new FakeGroups([group]), new FakeCompetencyDomains());
        vm.Initialize(group.Id, group.SchoolYear);
        vm.SelectedSession = vm.Sessions.Single(s => s.Id == session.Id);
        vm.OnConfirmDeleteSession = (_, _) => Task.FromResult(false);

        await vm.DeleteSessionCommand.ExecuteAsync(null);

        Assert.NotNull(sessions.GetById(session.Id));
    }
}