using LehrerApp.TemplateDesigner;
using Xunit;

namespace LehrerApp.TemplateDesigner.Tests;

public sealed class ProjectLifecycleTests
{
    [Fact]
    public void Reset_ErzeugtEinVollstaendigLeeresUnabhaengigesProjekt()
    {
        var viewModel = new DesignerViewModel();
        viewModel.ImportAsset("logo.png", OnePixelPng);
        viewModel.Placeholders.Add(new("Test", LehrerApp.Templating.PlaceholderType.Text, false, "Wert"));
        viewModel.NewElementType = "IMG";
        viewModel.NewContent = "logo.png";

        viewModel.Reset();

        Assert.Equal("neue-vorlage", viewModel.TemplateId);
        Assert.Equal("PAGE 210 297 mm\n", viewModel.LayoutSource);
        Assert.Empty(viewModel.Placeholders);
        Assert.Empty(viewModel.Assets);
        Assert.Empty(viewModel.AssetItems);
        Assert.Equal("de-DE", viewModel.MetadataItems.Single(x => x.Name == "language").Value);
        Assert.Equal("letter", viewModel.MetadataItems.Single(x => x.Name == "report-type").Value);
        Assert.Null(viewModel.SelectedAsset);
        Assert.Null(viewModel.PreviewImage);
        Assert.Equal("TEXT", viewModel.NewElementType);
        Assert.Equal("$Brieftext", viewModel.NewContent);
        Assert.False(viewModel.CanExport);
    }

    [Fact]
    public void FreieMetadaten_WerdenInDasManifestUebernommen()
    {
        var viewModel = new DesignerViewModel();
        viewModel.MetadataItems.Add(new("school-year", "2026/27"));

        var manifest = viewModel.BuildManifest();

        Assert.Equal("de-DE", manifest.Metadata["language"]);
        Assert.Equal("2026/27", manifest.Metadata["school-year"]);
    }

    [Fact]
    public void PlatzhalterAnlegen_WaehltIhnAusUndUebernimmtBearbeiteteDefinition()
    {
        var viewModel = new DesignerViewModel();
        viewModel.Placeholders.Clear();

        var placeholder = viewModel.AddPlaceholder();
        placeholder.Name = "Sprache";
        placeholder.Type = LehrerApp.Templating.PlaceholderType.Text;
        placeholder.Required = true;
        placeholder.Sample = "Deutsch";

        Assert.Same(placeholder, viewModel.SelectedPlaceholder);
        var definition = Assert.Single(viewModel.BuildManifest().Placeholders);
        Assert.Equal("Sprache", definition.Name);
        Assert.Equal(LehrerApp.Templating.PlaceholderType.Text, definition.Type);
        Assert.True(definition.Required);

        viewModel.RemoveSelectedPlaceholder();
        Assert.Empty(viewModel.Placeholders);
        Assert.Null(viewModel.SelectedPlaceholder);
    }

    [Fact]
    public void DoppeltePlatzhalternamen_WerdenVerstaendlichAbgelehnt()
    {
        var viewModel = new DesignerViewModel();
        viewModel.Placeholders.Clear();
        viewModel.Placeholders.Add(new("Name", LehrerApp.Templating.PlaceholderType.Text, false, "A"));
        viewModel.Placeholders.Add(new("Name", LehrerApp.Templating.PlaceholderType.Text, false, "B"));

        var exception = Assert.Throws<InvalidDataException>(() => viewModel.BuildManifest());

        Assert.Contains("mehrfach", exception.Message);
    }

    private static readonly byte[] OnePixelPng = Convert.FromBase64String(
        "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=");
}