using LehrerApp.Templating;
using Xunit;

namespace LehrerApp.Templating.Tests;

public sealed class ConstantPlaceholderTests
{
    [Fact]
    public void Resolver_KonstanterWertUeberschreibtExternenWert()
    {
        var manifest = new TemplateManifest
        {
            Placeholders = [new("Hinweis", PlaceholderType.Multiline, true, true, "Interner Langtext")],
        };
        var external = new Dictionary<string, PlaceholderValue>
        { ["Hinweis"] = new MultilineValue("Extern manipuliert") };

        var resolved = TemplateDataResolver.Resolve(manifest, external);

        Assert.Equal("Interner Langtext", Assert.IsType<MultilineValue>(resolved["Hinweis"]).Value);
    }

    [Fact]
    public void Renderer_BenoetigtFuerKonstantenPflichtwertKeineExternenDatenUndUnterstuetztHervorhebung()
    {
        var manifest = new TemplateManifest
        {
            Id = "konstant", Name = "Konstant",
            Placeholders = [new("Hinweis", PlaceholderType.Multiline, true, true,
                "Dieser Text lebt im Paket.", Bold: true, Italic: true, Underline: true)],
        };
        var layout = new LayoutParser().Parse("PAGE 210 297 mm\nTEXTBOX 20 20 170 50 $Hinweis size=11");
        var template = new LoadedTemplate(manifest, layout, new Dictionary<string, byte[]>());

        var pdf = new QuestTemplateRenderer().RenderToPdf(template, new EmptyProvider());

        Assert.Equal("%PDF", System.Text.Encoding.ASCII.GetString(pdf, 0, 4));
    }

    [Fact]
    public void Validate_BehandeltKonstantenPflichtwertAlsInternErfuellt()
    {
        var manifest = new TemplateManifest
        {
            Placeholders =
            [
                new("Intern", PlaceholderType.Text, true, true, "Fest"),
                new("Extern", PlaceholderType.Text, true),
            ],
        };
        var template = new LoadedTemplate(manifest, new(210, 297, "mm", []), new Dictionary<string, byte[]>());

        var result = new TemplateLoader().Validate(template, new Dictionary<string, PlaceholderType>());

        Assert.Single(result.Issues);
        Assert.Contains("Extern", result.Issues[0].Message);
    }

    [Fact]
    public void PaketRoundtrip_BehaeltKonstantenWertUndTextformatierung()
    {
        var path = Path.Combine(Path.GetTempPath(), $"constant-{Guid.NewGuid():N}.lavorlage");
        try
        {
            var manifest = new TemplateManifest
            {
                Id = "konstant", Name = "Konstant",
                Placeholders = [new("Baustein", PlaceholderType.Text, false, true, "Fest im Paket",
                    Bold: true, Italic: false, Underline: true)],
            };
            TemplatePackage.Create(path, manifest, "PAGE 210 297 mm\nTEXT 20 20 $Baustein",
                new Dictionary<string, byte[]>());

            var definition = Assert.Single(new TemplateLoader().LoadFromPackage(path).Manifest.Placeholders);

            Assert.True(definition.IsConstant);
            Assert.Equal("Fest im Paket", definition.ConstantValue);
            Assert.True(definition.Bold);
            Assert.True(definition.Underline);
        }
        finally { if (File.Exists(path)) File.Delete(path); }
    }

    [Fact]
    public void RichTextParser_UnterstuetztVerschachtelteHervorhebungUndExternePlatzhalter()
    {
        var runs = TemplateRichText.Parse("Hallo [b]Familie [i]${Student.LastName}[/i][/b]!");

        var placeholder = Assert.Single(runs, x => x.IsPlaceholder);
        Assert.Equal("Student.LastName", placeholder.Placeholder);
        Assert.True(placeholder.Bold);
        Assert.True(placeholder.Italic);
        Assert.False(placeholder.Underline);
        Assert.Throws<InvalidDataException>(() => TemplateRichText.Parse("[b]nicht geschlossen"));
    }

    [Fact]
    public void ExternerWertWirdImKonstantenRichTextNichtAlsMarkupInterpretiert()
    {
        var manifest = new TemplateManifest
        {
            Id = "sicher", Name = "Sicher",
            Placeholders =
            [
                new("Baustein", PlaceholderType.Multiline, true, true,
                    "Sehr geehrte Familie [b]${Student.LastName}[/b],"),
                new("Student.LastName", PlaceholderType.Text, true),
            ],
        };
        var template = new LoadedTemplate(manifest,
            new LayoutParser().Parse("PAGE 210 297 mm\nTEXTBOX 20 20 170 50 $Baustein"),
            new Dictionary<string, byte[]>());
        var provider = new ValuesProvider(new Dictionary<string, PlaceholderValue>
        { ["Student.LastName"] = new TextValue("[u]nicht als Markup geöffnet") });

        var pdf = new QuestTemplateRenderer().RenderToPdf(template, provider);

        Assert.Equal("%PDF", System.Text.Encoding.ASCII.GetString(pdf, 0, 4));
    }

    [Fact]
    public void KonstantenValidierung_MeldetNichtDeklarierteEingebettetePlatzhalter()
    {
        var manifest = new TemplateManifest
        {
            Placeholders = [new("Baustein", PlaceholderType.Text, false, true, "Hallo ${Unbekannt}")],
        };

        var issue = Assert.Single(TemplateDataResolver.ValidateConstants(manifest));

        Assert.Contains("Unbekannt", issue);
    }

    private sealed class EmptyProvider : ITemplateDataProvider
    {
        public IReadOnlyDictionary<string, PlaceholderValue> GetValues() =>
            new Dictionary<string, PlaceholderValue>();
    }

    private sealed class ValuesProvider(IReadOnlyDictionary<string, PlaceholderValue> values) : ITemplateDataProvider
    {
        public IReadOnlyDictionary<string, PlaceholderValue> GetValues() => values;
    }
}