WebView2EnvironmentManager.cs

using Microsoft.Web.WebView2.Core;

namespace PiPCrunchy;

/// <summary>
/// Singleton manager for shared WebView2 environment
/// Ensures all windows use the same environment instance
/// </summary>
public static class WebView2EnvironmentManager
{
    private static CoreWebView2Environment? _sharedEnvironment;
    private static readonly object _lock = new object();

    /// <summary>
    /// Gets or creates the shared WebView2 environment
    /// </summary>
    public static async Task<CoreWebView2Environment> GetEnvironmentAsync()
    {
        if (_sharedEnvironment != null)
        {
            return _sharedEnvironment;
        }

        lock (_lock)
        {
            // Double-check after acquiring lock
            if (_sharedEnvironment != null)
            {
                return _sharedEnvironment;
            }
        }

        // Create environment outside lock to avoid blocking
        var userDataFolder = System.IO.Path.Combine(
            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
            "PiPStream",
            "WebView2Data"
        );

        // Performance optimization: Configure environment with additional options
        var environmentOptions = new CoreWebView2EnvironmentOptions
        {
            AdditionalBrowserArguments =
                "--disable-background-timer-throttling " +  // Prevent throttling of background tabs
                "--disable-renderer-backgrounding " +       // Keep renderer active
                "--disable-backgrounding-occluded-windows " + // Don't throttle hidden windows
                "--disable-features=msSmartScreenProtection " + // Reduce overhead
                "--disable-extensions " +  // No extensions needed
                "--disable-background-networking"  // Reduce network overhead
        };

        var environment = await CoreWebView2Environment.CreateAsync(
            null, userDataFolder, environmentOptions
        );

        lock (_lock)
        {
            _sharedEnvironment = environment;
        }

        return environment;
    }
}