using TinyTUI.Autocomplete;
using TinyTUI.Components;
using TinyTUI.Input;
using TinyTUI.Rendering;
using TinyTUI.Terminal.Images;
using TinyTUI.Text;

namespace TinyTUI.Tests.Components;

public sealed class ComponentRegressionTests
{
    private readonly TerminalTextMeasurer _measurer = new();

    [Fact]
    public void FocusableComponentsOnlyRenderCursorMarkerWhenFocused()
    {
        var input = new TinyTUI.Components.Input(_measurer) { Prompt = "> " };
        Assert.DoesNotContain(CursorMarker.Marker, input.Render(20)[0], StringComparison.Ordinal);
        input.Focused = true;
        Assert.Contains(CursorMarker.Marker, input.Render(20)[0], StringComparison.Ordinal);

        var editor = new Editor(_measurer) { Placeholder = "type here" };
        Assert.DoesNotContain(CursorMarker.Marker, editor.Render(20)[0], StringComparison.Ordinal);
        editor.Focused = true;
        Assert.Contains(CursorMarker.Marker, editor.Render(20)[0], StringComparison.Ordinal);

        var list = new SelectList(_measurer);
        list.SetItems(["alpha", "beta"]);
        Assert.DoesNotContain(CursorMarker.Marker, list.Render(20)[0], StringComparison.Ordinal);
        list.Focused = true;
        Assert.Contains(CursorMarker.Marker, list.Render(20)[0], StringComparison.Ordinal);
    }

    [Fact]
    public void BasicLayoutComponentsClampAndPadRenderedLines()
    {
        Assert.Equal(3, new Spacer(3).Render(10).Count);
        Assert.Empty(new Spacer(-1).Render(10));

        var truncated = new TruncatedText("abcdef\nignored", _measurer)
        {
            PaddingX = 1,
            PaddingY = 1,
        };
        var lines = truncated.Render(6);

        Assert.Equal(3, lines.Count);
        Assert.Equal(6, _measurer.GetWidth(lines[1]));
        // TruncatedText 是单行组件 这里确认换行后的内容不会泄漏到渲染结果
        Assert.Contains("abc", lines[1], StringComparison.Ordinal);
        Assert.DoesNotContain("ignored", string.Concat(lines), StringComparison.Ordinal);
    }

    [Fact]
    public void CancellableLoaderCancelsTokenAndRunsCallback()
    {
        using var loader = new CancellableLoader(keybindings: KeybindingRegistry.CreateDefault());
        var canceled = false;
        loader.OnCanceled = () => canceled = true;

        loader.HandleInput(new TuiInputEvent(TuiInputEventKind.Key, KeyNames.Escape));

        Assert.True(loader.IsCanceled);
        Assert.True(loader.Token.IsCancellationRequested);
        Assert.True(canceled);
    }

    [Fact]
    public void SlashCommandAutocompleteCanRenderConfirmAndCancel()
    {
        var editor = new Editor(_measurer)
        {
            AutocompleteProvider = new SlashCommandAutocompleteProvider(
            [
                new SlashCommand("help", "show help"),
                new SlashCommand("history", "show history"),
            ]),
        };

        editor.HandleInput(new TuiInputEvent(TuiInputEventKind.Text, "/h"));
        Assert.True(editor.IsAutocompleteActive);
        Assert.Contains(editor.RenderAutocomplete(40), line => line.Contains("help", StringComparison.Ordinal));

        editor.HandleInput(new TuiInputEvent(TuiInputEventKind.Key, KeyNames.Down));
        editor.HandleInput(new TuiInputEvent(TuiInputEventKind.Key, KeyNames.Tab));
        Assert.Equal("/history ", editor.Value);
        Assert.False(editor.IsAutocompleteActive);

        editor.Value = "/h";
        editor.HandleInput(new TuiInputEvent(TuiInputEventKind.Key, KeyNames.Tab));
        editor.HandleInput(new TuiInputEvent(TuiInputEventKind.Key, KeyNames.Escape));
        Assert.False(editor.IsAutocompleteActive);
        Assert.Equal("/h", editor.Value);
    }

    [Fact]
    public void ImageComponentRendersKittySequenceAndFallback()
    {
        var imageService = new TerminalImageService();
        imageService.SetCapabilities(new TerminalCapabilities(ImageProtocol.Kitty, true, true));
        imageService.SetCellDimensions(new CellDimensions(10, 10));
        Assert.Equal(new ImageCellSize(2, 2), imageService.CalculateCellSize(new ImageDimensions(20, 20), 2));
        Assert.Equal(new ImageDimensions(2, 3), imageService.TryGetDimensions(Png2x3, "image/png"));

        var image = new Image([1, 2, 3, 4], "image/png", imageService: imageService, dimensions: new ImageDimensions(20, 20))
        {
            MaxWidthCells = 2,
        };
        var imageLines = image.Render(4);

        Assert.Equal(2, imageLines.Count);
        Assert.True(image.ImageId is > 0);
        Assert.StartsWith("\e_G", imageLines[0], StringComparison.Ordinal);
        Assert.Contains(",C=1,", imageLines[0], StringComparison.Ordinal);
        Assert.True(TerminalImageService.IsImageLine($"prefix {imageLines[0]} suffix"));

        imageService.SetCapabilities(TerminalCapabilities.Conservative);
        var fallback = new Image([1, 2, 3], "image/jpeg", imageService: imageService, dimensions: new ImageDimensions(8, 9))
        {
            FileName = "photo.jpg",
        }.Render(80)[0];
        Assert.Contains("[Image: photo.jpg [image/jpeg] 8x9]", fallback, StringComparison.Ordinal);
    }

    private static readonly byte[] Png2x3 = Convert.FromBase64String(
        "iVBORw0KGgoAAAANSUhEUgAAAAIAAAADCAIAAADZrBkAAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAFElEQVR4nGNgYGBgYGBgYGBgAAAABQABJzQnCgAAAABJRU5ErkJggg==");
}