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

namespace LehrerApp.Desktop.Tests;

public sealed class HazardAssessmentWizardViewModelTests
{
    private static HazardAssessmentWizardViewModel Build(HazardAssessment? editing = null) => new(editing, "10c");

    private static string BuildTempPath()
    {
        var path = Path.Combine(Path.GetTempPath(), $"lehrerapp-gbuwizard-tests-{Guid.NewGuid():N}");
        Directory.CreateDirectory(path);
        return path;
    }

    [Fact]
    public void Neu_StartetAufSchritt0OhneKiOhneEditingKennzeichnung()
    {
        var vm = Build();

        Assert.Equal(0, vm.StepIndex);
        Assert.True(vm.IsBasicsStep);
        Assert.True(vm.IsFirstStep);
        Assert.Equal("Gefährdungsbeurteilung erstellen", vm.DialogTitle);
        Assert.False(vm.CanUseAi);
    }

    [Fact]
    public void Next_OhneTitel_BleibtAufSchritt0UndSetztFehler()
    {
        var vm = Build();

        vm.NextCommand.Execute(null);

        Assert.Equal(0, vm.StepIndex);
        Assert.NotEqual("", vm.TitleError);
    }

    [Fact]
    public void Next_MitTitel_GehtEinenSchrittWeiterUndAktualisiertStepFlags()
    {
        var vm = Build();
        vm.Title = "Natrium in Wasser";

        vm.NextCommand.Execute(null);

        Assert.Equal(1, vm.StepIndex);
        Assert.True(vm.IsSubstancesStep);
        Assert.False(vm.IsFirstStep);
        Assert.Equal("", vm.TitleError);
    }

    [Fact]
    public void Back_AufSchritt0_BleibtAufSchritt0()
    {
        var vm = Build();

        vm.BackCommand.Execute(null);

        Assert.Equal(0, vm.StepIndex);
    }

    [Fact]
    public void DurchlaufAllerSchritte_LandetAufZusammenfassung()
    {
        var vm = Build();
        vm.Title = "Natrium in Wasser";

        for (var i = 0; i < vm.StepCount - 1; i++) vm.NextCommand.Execute(null);

        Assert.True(vm.IsSummaryStep);
        Assert.True(vm.IsLastStep);

        vm.NextCommand.Execute(null);
        Assert.True(vm.IsSummaryStep, "Weiter auf dem letzten Schritt darf nicht darüber hinausgehen.");
    }

    [Fact]
    public void AddSubstance_UndRemove_AktualisierenDieListeUndHasSubstances()
    {
        var vm = Build();
        Assert.False(vm.HasSubstances);

        vm.AddSubstanceCommand.Execute(null);
        Assert.True(vm.HasSubstances);
        var item = vm.Substances[0];
        item.Name = "Natrium";
        item.Amount = "ca. 0,5 g";
        item.PictogramOptions.First(o => o.Value == GhsPictogram.Flammable).IsSelected = true;

        item.RemoveCommand.Execute(null);

        Assert.False(vm.HasSubstances);
        Assert.Empty(vm.Substances);
    }

    [Fact]
    public void AddHazard_TrimmtUndLeertDasEingabefeld()
    {
        var vm = Build();

        vm.NewHazard = "  Verätzungsgefahr  ";
        vm.AddHazardCommand.Execute(null);

        Assert.Equal(["Verätzungsgefahr"], vm.Hazards);
        Assert.Equal("", vm.NewHazard);
    }

    [Fact]
    public void AddHazard_MitLeeremTextTutNichts()
    {
        var vm = Build();

        vm.NewHazard = "   ";
        vm.AddHazardCommand.Execute(null);

        Assert.Empty(vm.Hazards);
    }

    [Fact]
    public void RemoveHazard_EntferntGenauDenGenanntenEintrag()
    {
        var vm = Build();
        vm.NewHazard = "A"; vm.AddHazardCommand.Execute(null);
        vm.NewHazard = "B"; vm.AddHazardCommand.Execute(null);

        vm.RemoveHazardCommand.Execute("A");

        Assert.Equal(["B"], vm.Hazards);
    }

    [Fact]
    public void AddProtectiveMeasure_TrimmtUndLeertDasEingabefeld()
    {
        var vm = Build();

        vm.NewProtectiveMeasure = "  Schutzbrille  ";
        vm.AddProtectiveMeasureCommand.Execute(null);

        Assert.Equal(["Schutzbrille"], vm.ProtectiveMeasures);
        Assert.Equal("", vm.NewProtectiveMeasure);
    }

    [Fact]
    public void Save_OhneTitel_SetztFehlerUndSpringtZurueckAufSchritt0()
    {
        var vm = Build();
        vm.Title = "Etwas";
        vm.NextCommand.Execute(null); // Schritt 1
        vm.Title = "   ";

        vm.SaveCommand.Execute(null);

        Assert.Null(vm.Result);
        Assert.Equal(0, vm.StepIndex);
        Assert.NotEqual("", vm.TitleError);
    }

    [Fact]
    public void Save_BautVollstaendigesErgebnisAusAllenSchritten()
    {
        var vm = Build();
        vm.Title = "Natrium in Wasser";
        vm.GroupLabel = "10c";
        vm.DateText = "12.09.2026";
        vm.KindName = "Lehrerversuch";
        vm.Procedure = "Kurzbeschreibung";
        vm.AddSubstanceCommand.Execute(null);
        vm.Substances[0].Name = "Natrium";
        vm.Substances[0].Amount = "ca. 0,5 g";
        vm.Substances[0].HStatements = "H260";
        vm.Substances[0].PictogramOptions.First(o => o.Value == GhsPictogram.Flammable).IsSelected = true;
        vm.NewHazard = "Verpuffung"; vm.AddHazardCommand.Execute(null);
        vm.NewProtectiveMeasure = "Schutzbrille"; vm.AddProtectiveMeasureCommand.Execute(null);
        vm.FirstAid = "Wasser spülen";
        vm.Disposal = "Abreagieren lassen";
        vm.Notes = "Hinweis";

        vm.SaveCommand.Execute(null);

        Assert.NotNull(vm.Result);
        var result = vm.Result!;
        Assert.Equal("Natrium in Wasser", result.Title);
        Assert.Equal("10c", result.GroupLabel);
        Assert.Equal(new DateOnly(2026, 9, 12), result.Date);
        Assert.Equal(ExperimentKind.Lehrerversuch, result.Kind);
        var substance = Assert.Single(result.Substances);
        Assert.Equal("Natrium", substance.Name);
        Assert.Equal([GhsPictogram.Flammable], substance.GhsPictograms);
        Assert.Equal(["Verpuffung"], result.Hazards);
        Assert.Equal(["Schutzbrille"], result.ProtectiveMeasures);
        Assert.Equal("Wasser spülen", result.FirstAid);
        Assert.Equal("Abreagieren lassen", result.Disposal);
        Assert.Equal("Hinweis", result.Notes);
        Assert.False(result.IsAiAssisted);
    }

    [Fact]
    public void Konstruktor_MitEditingLaedtAlleFelderVor()
    {
        var editing = new HazardAssessment
        {
            Title = "Bestehende GBU",
            GroupLabel = "9a",
            Date = new DateOnly(2026, 1, 15),
            Kind = ExperimentKind.Schuelerversuch,
            Procedure = "Ablauf",
            Substances = [new HazardSubstance { Name = "Salzsäure", GhsPictograms = [GhsPictogram.Corrosive] }],
            Hazards = ["Verätzung"],
            ProtectiveMeasures = ["Handschuhe"],
            FirstAid = "Erste Hilfe Text",
            Disposal = "Entsorgungstext",
            Notes = "Notiz",
            IsAiAssisted = true,
        };

        var vm = Build(editing);

        Assert.Equal("Gefährdungsbeurteilung bearbeiten", vm.DialogTitle);
        Assert.Equal("Bestehende GBU", vm.Title);
        Assert.Equal("9a", vm.GroupLabel);
        Assert.Equal("15.01.2026", vm.DateText);
        Assert.Equal("Schülerversuch", vm.KindName);
        Assert.Equal("Ablauf", vm.Procedure);
        var substance = Assert.Single(vm.Substances);
        Assert.Equal("Salzsäure", substance.Name);
        Assert.True(substance.PictogramOptions.Single(o => o.Value == GhsPictogram.Corrosive).IsSelected);
        Assert.Equal(["Verätzung"], vm.Hazards);
        Assert.Equal(["Handschuhe"], vm.ProtectiveMeasures);
        Assert.Equal("Erste Hilfe Text", vm.FirstAid);
        Assert.Equal("Entsorgungstext", vm.Disposal);
        Assert.Equal("Notiz", vm.Notes);
        Assert.True(vm.IsAiAssisted);
    }

    [Fact]
    public void CanUseAi_OhneKiAbhaengigkeiten_IstFalseUndSubstanzenKoennenNichtRecherchieren()
    {
        var vm = Build();
        vm.AddSubstanceCommand.Execute(null);

        Assert.False(vm.CanUseAi);
        Assert.False(vm.Substances[0].CanResearch);
    }

    [Fact]
    public void CanUseAi_MitAngemeldeterKiUndUnitUndLesson_IstTrueUndSubstanzenKoennenRecherchieren()
    {
        var aiSettings = new AiSettingsService(BuildTempPath());
        aiSettings.SetEnabled(true);
        aiSettings.SetCredentialsAndToken("sebastian", "token-abc");
        var ai = new AiPlanningService(new HttpClient(), new FakeLessons(), new FakeGroups([]),
            new FakeSubjects([]), new FakeCompetencyDomains(), new FakeAlternativeLessonPaths([]));
        var unit = new Unit { Title = "Redoxreaktionen" };
        var lesson = new Lesson { Topic = "Natrium in Wasser" };

        var vm = new HazardAssessmentWizardViewModel(null, "10c", ai, aiSettings, unit, lesson);
        vm.AddSubstanceCommand.Execute(null);

        Assert.True(vm.CanUseAi);
        Assert.True(vm.Substances[0].CanResearch);
    }
}

public sealed class HazardSubstanceEditItemTests
{
    [Fact]
    public async Task Research_OhneOnResearch_TutNichtsUndBleibtOhneFehler()
    {
        var item = new HazardSubstanceEditItem { Name = "Natrium" };

        await item.ResearchCommand.ExecuteAsync(null);

        Assert.Equal("", item.ResearchError);
        Assert.False(item.IsResearching);
    }

    [Fact]
    public async Task Research_OhneNamen_SetztFehlerUndRuftDelegateNicht()
    {
        var called = false;
        var item = new HazardSubstanceEditItem
        {
            Name = "  ",
            OnResearch = _ => { called = true; return Task.FromResult(new AiSubstanceResearchResponse()); },
        };

        await item.ResearchCommand.ExecuteAsync(null);

        Assert.False(called);
        Assert.Equal("Stoffname eingeben.", item.ResearchError);
    }

    [Fact]
    public async Task Research_UebernimmtAlleFelderAusDerAntwort()
    {
        var item = new HazardSubstanceEditItem { Name = "Natrium" };
        item.OnResearch = name =>
        {
            Assert.Equal("Natrium", name);
            return Task.FromResult(new AiSubstanceResearchResponse
            {
                Name = "Natrium",
                Cas = "7440-23-5",
                SignalWord = "Gefahr",
                HStatements = "H260",
                PStatements = "P223, P231+P232",
                ActivityRestriction = "Für Schüler ab der 5. Klasse freigegeben",
                GhsPictograms = ["GHS02", "GHS05"],
            });
        };

        await item.ResearchCommand.ExecuteAsync(null);

        Assert.Equal("Natrium", item.Name);
        Assert.Equal("7440-23-5", item.Cas);
        Assert.Equal("Gefahr", item.SignalWord);
        Assert.Equal("H260", item.HStatements);
        Assert.Equal("P223, P231+P232", item.PStatements);
        Assert.Equal("Für Schüler ab der 5. Klasse freigegeben", item.ActivityRestriction);
        Assert.True(item.PictogramOptions.Single(o => o.Value == GhsPictogram.Flammable).IsSelected);
        Assert.True(item.PictogramOptions.Single(o => o.Value == GhsPictogram.Corrosive).IsSelected);
        Assert.False(item.PictogramOptions.Single(o => o.Value == GhsPictogram.Toxic).IsSelected);
        Assert.False(item.IsResearching);
        Assert.Equal("", item.ResearchError);
    }

    [Fact]
    public async Task Research_BeiFehler_SetztResearchErrorUndBehaeltAlteFelderUnveraendert()
    {
        var item = new HazardSubstanceEditItem { Name = "Unbekannt", HStatements = "H999" };
        item.OnResearch = _ => throw new AiBackendException("Nicht genügend KI-Guthaben. Bitte Guthaben aufladen.");

        await item.ResearchCommand.ExecuteAsync(null);

        Assert.Equal("Nicht genügend KI-Guthaben. Bitte Guthaben aufladen.", item.ResearchError);
        Assert.Equal("H999", item.HStatements);
        Assert.False(item.IsResearching);
    }
}

public sealed class ExperimentKindDisplayTests
{
    [Theory]
    [InlineData(ExperimentKind.Lehrerversuch, "Lehrerversuch")]
    [InlineData(ExperimentKind.Schuelerversuch, "Schülerversuch")]
    [InlineData(ExperimentKind.Demonstrationsversuch, "Demonstrationsversuch")]
    public void Label_UndFromLabel_SindZueinanderInvers(ExperimentKind kind, string label)
    {
        Assert.Equal(label, ExperimentKindDisplay.Label(kind));
        Assert.Equal(kind, ExperimentKindDisplay.FromLabel(label));
    }

    [Fact]
    public void FromLabel_UnbekanntFaelltAufLehrerversuchZurueck() =>
        Assert.Equal(ExperimentKind.Lehrerversuch, ExperimentKindDisplay.FromLabel("Unbekannt"));

    [Theory]
    [InlineData("Schuelerversuch", ExperimentKind.Schuelerversuch)]
    [InlineData("Demonstrationsversuch", ExperimentKind.Demonstrationsversuch)]
    [InlineData("etwas anderes", ExperimentKind.Lehrerversuch)]
    public void FromWireValue_LiestDenUnmarkiertenEnumNamenDerKiAntwort(string wire, ExperimentKind expected) =>
        Assert.Equal(expected, ExperimentKindDisplay.FromWireValue(wire));
}

public sealed class GhsPictogramDisplayTests
{
    [Theory]
    [InlineData(GhsPictogram.Explosive, "GHS01")]
    [InlineData(GhsPictogram.Corrosive, "GHS05")]
    [InlineData(GhsPictogram.Environmental, "GHS09")]
    public void Code_LiefertDenErwartetenGhsCode(GhsPictogram value, string code) =>
        Assert.Equal(code, GhsPictogramDisplay.Code(value));

    [Fact]
    public void FromCode_IstFallUnabhaengigUndTrimmt() =>
        Assert.Equal(GhsPictogram.Corrosive, GhsPictogramDisplay.FromCode(" ghs05 "));

    [Fact]
    public void FromCode_UnbekannterCodeLiefertNull() =>
        Assert.Null(GhsPictogramDisplay.FromCode("GHS99"));

    [Fact]
    public void BuildOptions_MarkiertNurDieUebergebenenAlsAusgewaehlt()
    {
        var options = GhsPictogramDisplay.BuildOptions([GhsPictogram.Toxic, GhsPictogram.Flammable]);

        Assert.Equal(9, options.Count);
        Assert.True(options.Single(o => o.Value == GhsPictogram.Toxic).IsSelected);
        Assert.True(options.Single(o => o.Value == GhsPictogram.Flammable).IsSelected);
        Assert.False(options.Single(o => o.Value == GhsPictogram.Corrosive).IsSelected);
    }
}