using LehrerApp.TemplateDesigner;
using Xunit;

namespace LehrerApp.TemplateDesigner.Tests;

public sealed class AssetManagementTests
{
    private static readonly byte[] OnePixelPng = Convert.FromBase64String(
        "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=");

    [Fact]
    public void Import_ZeigtMetadatenUndBenenntKollisionenUm()
    {
        var viewModel = new DesignerViewModel();

        var first = viewModel.ImportAsset("mein logo.png", OnePixelPng);
        var second = viewModel.ImportAsset("mein logo.png", OnePixelPng);

        Assert.Equal("mein-logo.png", first.Name);
        Assert.Equal("mein-logo-2.png", second.Name);
        Assert.Equal("1 × 1 px", first.Dimensions);
        Assert.Equal(2, viewModel.AssetItems.Count);
    }

    [Fact]
    public void AlsImageEinfuegen_VerwendetKoordinatenUndAktualisiertReferenzzaehler()
    {
        var viewModel = new DesignerViewModel
        { NewX = "15", NewY = "18", NewWidth = "32", NewHeight = "14" };
        viewModel.ImportAsset("logo.png", OnePixelPng);

        viewModel.InsertSelectedAssetAsImage();

        Assert.Contains("IMG logo.png 15 18 32 14 scale=100%", viewModel.LayoutSource);
        Assert.Equal(1, viewModel.SelectedAsset!.UsageCount);
    }

    [Fact]
    public void AlsImageEinfuegen_SchreibtProzentualeSkalierung()
    {
        var viewModel = new DesignerViewModel { NewImageScale = "37,5" };
        viewModel.ImportAsset("logo.png", OnePixelPng);

        viewModel.InsertSelectedAssetAsImage();

        Assert.Contains("scale=37.5%", viewModel.LayoutSource);
    }

    [Fact]
    public void Entfernen_LoeschtAssetUndAlleLayoutReferenzen()
    {
        var viewModel = new DesignerViewModel();
        viewModel.ImportAsset("logo.png", OnePixelPng);
        viewModel.InsertSelectedAssetAsImage();

        viewModel.RemoveSelectedAsset();

        Assert.Empty(viewModel.AssetItems);
        Assert.Empty(viewModel.Assets);
        Assert.DoesNotContain("IMG logo.png", viewModel.LayoutSource);
    }

    [Fact]
    public void Ersetzen_BehältDateinamenUndLayoutReferenzen()
    {
        var viewModel = new DesignerViewModel();
        viewModel.ImportAsset("logo.png", OnePixelPng);
        viewModel.InsertSelectedAssetAsImage();

        viewModel.ReplaceSelectedAsset(OnePixelPng);

        Assert.Equal("logo.png", Assert.Single(viewModel.AssetItems).Name);
        Assert.Contains("IMG logo.png", viewModel.LayoutSource);
        Assert.Equal(1, viewModel.SelectedAsset!.UsageCount);
    }
}