LehrerApp/LehrerApp.Desktop.Tests/ExamCoverSheetTests.cs

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

namespace LehrerApp.Desktop.Tests;

public sealed class ExamCoverSheetTests : IDisposable
{
    private readonly string _directory = Path.Combine(Path.GetTempPath(), $"lehrerapp-cover-tests-{Guid.NewGuid():N}");
    private readonly LearningGroup _group = new() { Name = "9 Ch G", SchoolYear = "2025/26", GradeLevel = 9 };
    private readonly Student _anna = new() { FirstName = "Anna", LastName = "Adler" };
    private readonly Student _ben = new() { FirstName = "Ben", LastName = "Bauer" };
    private readonly Exam _exam;
    private readonly FakeResults _results = new();

    private const string Layout = """
        PAGE 210 297 mm
        #pragma format-version 3
        #pragma page-template first
        TEXT 20 20 $Student.Name size=12
        #pragma flow-slot body x=20 y=40 w=170 h=230
        #pragma end-page-template
        #pragma content-flow body
        TEXT $Exam.Title size=14
        FLOWDRAWBOX $Exam.PointsTable w=170 h=120 fit=content gap=10
        TEXT "Gesamtpunkte: $Result.Points von $Exam.MaxPoints Punkte" size=11 gap=8
        TEXT "Note: $Result.Grade" size=14 gap=4
        #pragma end-content-flow
        """;

    public ExamCoverSheetTests()
    {
        Directory.CreateDirectory(_directory);
        _exam = new Exam
        {
            GroupId = _group.Id, Title = "Atombau und PSE", Date = new DateOnly(2025, 12, 18), ExamNumber = 1,
            Tasks =
            [
                new() { Nr = 1, MaxPoints = 5 }, new() { Nr = 2, MaxPoints = 12 },
                new() { Nr = 3, MaxPoints = 3, IsBonus = true },
            ],
            GradingKey = [new() { Grade = "1", MinPercent = 90 }, new() { Grade = "6", MinPercent = 0 }],
        };
    }

    [Fact]
    public void PointsTable_BrichtBeiFesterSpaltenbreiteInWeitereBloeckeUm()
    {
        var eight = Enumerable.Range(1, 8).Select(n => new ExamCoverTaskColumn(n.ToString(), n, false, null)).ToList();

        var oneBlock = ExamPointsTableDrawingBuilder.Build(eight.Take(6).ToList(), 170);
        var twoBlocks = ExamPointsTableDrawingBuilder.Build(eight, 170);

        Assert.Equal(6, ExamPointsTableDrawingBuilder.ColumnsPerBlock(170));
        Assert.True(twoBlocks.ContentHeight > 2 * oneBlock.ContentHeight);
        // Spalten bleiben gleich breit - der zweite Block verkleinert nichts.
        Assert.Equal(Widths(oneBlock), Widths(twoBlocks));
        Assert.All(twoBlocks.Commands.OfType<DrawRectangle>(), r => Assert.True(r.X + r.Width <= 170));
    }

    [Fact]
    public void PointsTable_Bonusaufgabe_OhneNummerMitPlusVorDerPunktzahl()
    {
        var drawing = ExamPointsTableDrawingBuilder.Build(
        [
            new("1", 5, false, 4.5), new("", 3, true, 1),
        ]);

        var texts = drawing.Commands.OfType<DrawStringEx>().Select(x => x.Text).ToList();
        Assert.Equal(["Aufgabe", "Max. Punktzahl", "Punktzahl", "Nr. 1", "5", "4,5", "Bonus", "+3", "1"], texts);
    }

    [Fact]
    public void PointsTable_VorlageInPunkt_SkaliertDenMillimeterEntwurf()
    {
        List<ExamCoverTaskColumn> columns = [new("1", 5, false, null)];
        var scale = 72f / 25.4f;

        var millimeters = ExamPointsTableDrawingBuilder.Build(columns, 170);
        var points = ExamPointsTableDrawingBuilder.Build(columns, 170 * scale, scale);

        Assert.Equal(millimeters.ContentHeight * scale, points.ContentHeight, 2);
    }

    [Fact]
    public void Dialog_ZeigtNurDeckblattVorlagen_AusBeidenBibliotheken()
    {
        var letters = Store(); var worksheets = Store();
        Import(letters, "brief", "Brief", null);
        Import(letters, "deckblatt-a", "Deckblatt A", TemplateReportTypes.ExamCover);
        Import(worksheets, "deckblatt-b", "Deckblatt B", TemplateReportTypes.ExamCover);

        var vm = Build([letters, worksheets]);

        Assert.Equal(["Deckblatt A", "Deckblatt B"], vm.Templates.Select(x => x.Name));
    }

    [Fact]
    public void Dialog_VorDerKorrektur_BlankoVorausgewaehlt_NachBeginnAusgefuellt()
    {
        Assert.False(Build([Store()]).FillResults);

        _results.Add(new ExamResult { ExamId = _exam.Id, StudentId = _anna.Id, Points = [4, 10, 0], TotalPoints = 14 });

        Assert.True(Build([Store()]).FillResults);
    }

    [Fact]
    public void Dialog_AbwesenderSchueler_IstStandardmaessigAbgewaehlt()
    {
        _results.Add(new ExamResult { ExamId = _exam.Id, StudentId = _ben.Id, Absent = true });

        var vm = Build([Store()]);

        Assert.True(vm.Students.Single(s => s.Model.Id == _anna.Id).IsIncluded);
        Assert.False(vm.Students.Single(s => s.Model.Id == _ben.Id).IsIncluded);
    }

    [Fact]
    public async Task Generate_SchreibtEinSammelPdfMitEinerSeiteJeSchueler()
    {
        _results.Add(new ExamResult
        { ExamId = _exam.Id, StudentId = _anna.Id, Points = [4.5, 12, 1], TotalPoints = 17.5 });
        var store = Store();
        Import(store, "deckblatt", "Deckblatt", TemplateReportTypes.ExamCover);
        var vm = Build([store]);
        var output = Path.Combine(_directory, "deckblaetter.pdf");

        Assert.True(await vm.GenerateAsync(output));

        using var document = UglyToad.PdfPig.PdfDocument.Open(output);
        Assert.Equal(2, document.NumberOfPages);
        var anna = Normalize(document.GetPage(1).Text);
        var ben = Normalize(document.GetPage(2).Text);
        Assert.Contains(Normalize(_anna.FullName), anna);
        Assert.Contains(Normalize(_ben.FullName), ben);
        Assert.Contains("AtombauundPSE", anna);
        // Bonusaufgabe zählt nicht zur erreichbaren Punktzahl; erreichte Bonuspunkte schon.
        Assert.Contains("Gesamtpunkte:17,5von17Punkte", anna);
        Assert.Contains("Note:1", anna);
        Assert.Contains("+3", anna);
        // Ben ist noch nicht korrigiert: Linien zum Ausfüllen statt Punkten und Note.
        Assert.Contains($"Gesamtpunkte:{ExamCoverPlaceholderBuilder.BlankPoints}von17Punkte", ben);
        Assert.Contains("1 davon ohne Punkte und Note", vm.StatusMessage);
        Assert.False(vm.IsGenerating);
        Assert.True(vm.CanGenerate);
    }

    [Fact]
    public async Task Generate_OhnePunkteEintragen_BleibtAuchBeiKorrigiertenBlanko()
    {
        _results.Add(new ExamResult
        { ExamId = _exam.Id, StudentId = _anna.Id, Points = [4.5, 12, 1], TotalPoints = 17.5 });
        var store = Store();
        Import(store, "deckblatt", "Deckblatt", TemplateReportTypes.ExamCover);
        var vm = Build([store]);
        vm.FillResults = false;
        var output = Path.Combine(_directory, "blanko.pdf");

        Assert.True(await vm.GenerateAsync(output));

        using var document = UglyToad.PdfPig.PdfDocument.Open(output);
        Assert.DoesNotContain("17,5", Normalize(document.GetPage(1).Text));
    }

    [Fact]
    public async Task Generate_ZuVieleAufgabenFuerEineSeite_WarntImStatus()
    {
        _exam.Tasks = Enumerable.Range(1, 80).Select(n => new ExamTask { Nr = n, MaxPoints = 1 }).ToList();
        var store = Store();
        Import(store, "deckblatt", "Deckblatt", TemplateReportTypes.ExamCover);
        var vm = Build([store]);

        Assert.True(await vm.GenerateAsync(Path.Combine(_directory, "lang.pdf")));

        Assert.Contains("passen nicht auf eine Seite", vm.StatusMessage);
    }

    [Theory]
    [InlineData(GroupType.Course, Niveau.E, "E-Kurs")]
    [InlineData(GroupType.Course, Niveau.G, "G-Kurs")]
    [InlineData(GroupType.Course, Niveau.Foerder, "")]
    [InlineData(GroupType.Course, null, "")]
    [InlineData(GroupType.Class, Niveau.G, "")]
    public void CourseLabel_NurImKursMitEOderGNiveau(GroupType type, Niveau? niveau, string expected) =>
        Assert.Equal(expected, ExamCoverPlaceholderBuilder.CourseLabel(new LearningGroup { Type = type }, niveau));

    [Fact]
    public void Platzhalter_KursAusKlausurOderMitgliedschaft_KuerzelAusDemDialog()
    {
        _group.Type = GroupType.Course;
        var store = Store();
        Import(store, "deckblatt", "Deckblatt", TemplateReportTypes.ExamCover);
        var template = store.Load(store.GetTemplates().Single());

        Dictionary<string, PlaceholderValue> Values(Niveau? studentNiveau) => ExamCoverPlaceholderBuilder.Build(
            _exam, _group, "Chemie", _anna, null, false, new GradingService(), template, new DateOnly(2026, 1, 1),
            studentNiveau, " MON HED ");

        Assert.Equal(new TextValue("E-Kurs"), Values(Niveau.E)["Exam.Course"]);
        Assert.Equal(new TextValue("MON HED"), Values(null)["Teacher.Abbreviation"]);
        _exam.Niveau = Niveau.G;
        Assert.Equal(new TextValue("G-Kurs"), Values(Niveau.E)["Exam.Course"]);
    }

    [Fact]
    public void Platzhalter_TitelAusDemDialog_LeerNimmtDenKlausurtitel()
    {
        var store = Store();
        Import(store, "deckblatt", "Deckblatt", TemplateReportTypes.ExamCover);
        var template = store.Load(store.GetTemplates().Single());

        Dictionary<string, PlaceholderValue> Values(string? title) => ExamCoverPlaceholderBuilder.Build(
            _exam, _group, "Chemie", _anna, null, false, new GradingService(), template, new DateOnly(2026, 1, 1),
            title: title);

        Assert.Equal(new TextValue("Klassenarbeit Nr. 1"), Values(" Klassenarbeit Nr. 1 ")["Exam.Title"]);
        Assert.Equal(new TextValue("Atombau und PSE"), Values("  ")["Exam.Title"]);
        Assert.Equal(new TextValue("Atombau und PSE"), Values(null)["Exam.Title"]);
    }

    [Fact]
    public void Dialog_TitelIstMitDemKlausurtitelVorbelegt()
    {
        var store = Store();
        Import(store, "deckblatt", "Deckblatt", TemplateReportTypes.ExamCover);

        var vm = Build([store]);

        Assert.Equal("Atombau und PSE", vm.CoverTitle);
        vm.CoverTitle = "Klassenarbeit Nr. 1";
        Assert.Equal("Atombau und PSE", _exam.Title);
    }

    // Der Vorlagen-Designer bietet genau diesen Katalog an - liefert die Hauptapp einen Namen
    // nicht oder mit anderem Typ, scheitert die Vorlage erst beim Drucken.
    [Fact]
    public void Platzhalter_DeckenDenKatalogDesDesignersMitGleichenTypenAb()
    {
        var store = Store();
        Import(store, "deckblatt", "Deckblatt", TemplateReportTypes.ExamCover);
        var template = store.Load(store.GetTemplates().Single());

        var values = ExamCoverPlaceholderBuilder.Build(_exam, _group, "Chemie", _anna, null, false,
            new GradingService(), template, new DateOnly(2026, 1, 1));

        Assert.All(ExamCoverPlaceholders.All, known =>
        {
            Assert.True(values.ContainsKey(known.Name), $"{known.Name} fehlt");
            Assert.Equal(known.Type, values[known.Name].Type);
        });
    }

    [Fact]
    public void TeacherSettings_SpeichertDasKuerzel()
    {
        new TeacherSettingsService(_directory).SaveAbbreviation(" HED ");

        Assert.Equal("HED", new TeacherSettingsService(_directory).LoadAbbreviation());
    }

    private static string Normalize(string text) => text.Replace(" ", "");
    private static List<float> Widths(DrawingValue drawing) =>
        drawing.Commands.OfType<DrawRectangle>().Select(r => r.Width).Distinct().Order().ToList();

    private ExamCoverSheetDialogViewModel Build(IReadOnlyList<TemplateStore> stores) =>
        new(_exam, _group, "Chemie", new FakeStudents([_anna, _ben]), new FakeMemberships([]), _results,
            new GradingService(), stores, new QuestTemplateRenderer());

    private TemplateStore Store() => new(Path.Combine(_directory, $"store-{Guid.NewGuid():N}"));

    private void Import(TemplateStore store, string id, string name, string? reportType)
    {
        var source = Path.Combine(_directory, $"{Guid.NewGuid():N}.lavorlage");
        var manifest = new TemplateManifest
        {
            Id = id, Name = name,
            Placeholders =
            [
                new("Student.Name", PlaceholderType.Text), new("Exam.Title", PlaceholderType.Text),
                new("Exam.MaxPoints", PlaceholderType.Text), new("Result.Points", PlaceholderType.Text),
                new("Result.Grade", PlaceholderType.Text),
                new(ExamPointsTableDrawingBuilder.PlaceholderName, PlaceholderType.Drawing),
            ],
        };
        if (reportType is not null) manifest.Metadata[TemplateMetadataKeys.ReportType] = reportType;
        TemplatePackage.Create(source, manifest, Layout, new Dictionary<string, byte[]>());
        store.Import(source);
    }

    public void Dispose() { if (Directory.Exists(_directory)) Directory.Delete(_directory, true); }
}