namespace MBN_STOCK_WEBVIEW.LegacyWeb.Tests;

public sealed class LegacyPlayoutWebContractTests
{
    private static readonly string RepositoryRoot = FindRepositoryRoot();
    private static readonly string WebRoot = Path.Combine(
        RepositoryRoot,
        "src",
        "MBN_STOCK_WEBVIEW.LegacyParityApp",
        "Web");
    private static readonly string Markup = File.ReadAllText(
        Path.Combine(WebRoot, "index.html"));
    private static readonly string Script = File.ReadAllText(
        Path.Combine(WebRoot, "playout-ui.js"));

    [Fact]
    public void ShellExposesOriginalPlayoutBackgroundAndFadeControls()
    {
        foreach (var id in new[]
                 {
                     "playout-connection-state",
                     "playout-background-none",
                     "playout-background-file",
                     "playout-background-name",
                     "playout-fade-duration",
                     "playout-prepare",
                     "playout-take-in",
                     "playout-next",
                     "playout-take-out",
                     "playout-status"
                 })
        {
            Assert.Contains($"id=\"{id}\"", Markup, StringComparison.Ordinal);
        }

        Assert.Contains("PREPARE", Markup, StringComparison.Ordinal);
        Assert.Contains("TAKE IN", Markup, StringComparison.Ordinal);
        Assert.Contains("NEXT", Markup, StringComparison.Ordinal);
        Assert.Contains("TAKE OUT", Markup, StringComparison.Ordinal);
        var fadeMarkup = ExtractElement(Markup, "playout-fade-duration", "</select>");
        Assert.Equal(20, CountOccurrences(fadeMarkup, "<option value="));
        Assert.Contains("<script src=\"playout-ui.js\"></script>", Markup,
            StringComparison.Ordinal);
    }

    [Fact]
    public void PlayoutWebLayerSendsCommandIntentOnly()
    {
        foreach (var intent in new[]
                 {
                     "prepare-playout",
                     "take-in",
                     "next-playout",
                     "take-out",
                     "choose-background",
                     "toggle-background",
                     "set-fade-duration"
                 })
        {
            Assert.Contains($"\"{intent}\"", Script, StringComparison.Ordinal);
        }

        Assert.DoesNotContain("fetch(", Script, StringComparison.Ordinal);
        Assert.DoesNotContain("localStorage", Script, StringComparison.Ordinal);
        Assert.DoesNotContain("sessionStorage", Script, StringComparison.Ordinal);
        Assert.DoesNotContain("filePath", Script, StringComparison.Ordinal);
        Assert.DoesNotContain("sceneCode", Script, StringComparison.Ordinal);
        Assert.Contains("post(\"prepare-playout\", {})", Script,
            StringComparison.Ordinal);
        Assert.Contains("post(\"take-in\", {})", Script, StringComparison.Ordinal);
        Assert.Contains("post(\"next-playout\", {})", Script, StringComparison.Ordinal);
        Assert.Contains("post(\"take-out\", {})", Script, StringComparison.Ordinal);
    }

    [Fact]
    public void OriginalGlobalShortcutsAreIsolatedFromOpenDialogs()
    {
        Assert.Contains("hasOpenDialog()", Script, StringComparison.Ordinal);
        Assert.Contains("event.key === \"F2\"", Script, StringComparison.Ordinal);
        Assert.Contains("event.key === \"F3\"", Script, StringComparison.Ordinal);
        Assert.Contains("event.key === \"F8\"", Script, StringComparison.Ordinal);
        Assert.Contains("event.key === \"Escape\"", Script, StringComparison.Ordinal);
        Assert.Contains("event.repeat || hasOpenDialog()", Script,
            StringComparison.Ordinal);
    }

    [Fact]
    public void ButtonsFollowNativePhaseCallbackAndOutcomeState()
    {
        Assert.Contains("playout.outcomeUnknown !== true", Script,
            StringComparison.Ordinal);
        Assert.Contains("const canPrepareToggle = playout.phase === \"idle\"", Script,
            StringComparison.Ordinal);
        Assert.Contains("const canTakeIn = playout.phase === \"prepared\"", Script,
            StringComparison.Ordinal);
        Assert.Contains("playout.phase === \"idle\" && hasPlaylist", Script,
            StringComparison.Ordinal);
        Assert.Contains("playout.phase !== \"program\"", Script,
            StringComparison.Ordinal);
        Assert.Contains("playout.isPlayCompletionPending === true", Script,
            StringComparison.Ordinal);
        Assert.Contains("playout.nextKind === \"none\"", Script,
            StringComparison.Ordinal);
    }

    private static int CountOccurrences(string source, string value)
    {
        var count = 0;
        var offset = 0;
        while ((offset = source.IndexOf(value, offset, StringComparison.Ordinal)) >= 0)
        {
            count++;
            offset += value.Length;
        }

        return count;
    }

    private static string ExtractElement(string source, string id, string closingTag)
    {
        var start = source.IndexOf($"id=\"{id}\"", StringComparison.Ordinal);
        Assert.True(start >= 0, $"Element '{id}' was not found.");
        var end = source.IndexOf(closingTag, start, StringComparison.Ordinal);
        Assert.True(end >= 0, $"Closing tag for '{id}' was not found.");
        return source[start..(end + closingTag.Length)];
    }

    private static string FindRepositoryRoot()
    {
        var current = new DirectoryInfo(AppContext.BaseDirectory);
        while (current is not null)
        {
            if (File.Exists(Path.Combine(current.FullName, "MBN_STOCK_WEBVIEW.sln")))
            {
                return current.FullName;
            }

            current = current.Parent;
        }

        throw new DirectoryNotFoundException("Repository root was not found.");
    }
}