ADOFAIRenderer/Util/FolderDialogUtil.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using MelonLoader;

namespace ADOFAIRenderer.Util;

internal static class FolderDialogUtil
{
    public static void OpenFolderBrowser(string initialDirectory, Action<string?> onSelected)
    {
        var syncContext = SynchronizationContext.Current;

        Task.Run(() =>
        {
            string? selected = null;
            try
            {
                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                {
                    selected = OpenWindowsFolderBrowser(initialDirectory);
                }
                else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
                {
                    selected = OpenMacFolderBrowser(initialDirectory);
                }
                else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
                {
                    selected = OpenLinuxFolderBrowser(initialDirectory);
                }
            }
            catch (Exception ex)
            {
                MelonLogger.Warning($"[FolderDialogUtil] Failed to open folder browser: {ex.Message}");
            }

            if (syncContext != null)
            {
                syncContext.Post(_ => onSelected(selected), null);
            }
            else
            {
                onSelected(selected);
            }
        });
    }

    private static string? OpenWindowsFolderBrowser(string initialDirectory)
    {
        try
        {
            var escapedDir = initialDirectory.Replace("'", "''");
            var script = $@"
[System.Reflection.Assembly]::LoadWithPartialName('System.Windows.Forms') | Out-Null
$f = New-Object System.Windows.Forms.FolderBrowserDialog
$f.Description = 'Select Output Directory'
if ([System.IO.Directory]::Exists('{escapedDir}')) {{
    $f.SelectedPath = '{escapedDir}'
}}
$f.ShowNewFolderButton = $true
if ($f.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) {{
    [Console]::Write($f.SelectedPath)
}}";

            var bytes = System.Text.Encoding.Unicode.GetBytes(script);
            var base64 = Convert.ToBase64String(bytes);

            var startInfo = new ProcessStartInfo
            {
                FileName = "powershell.exe",
                Arguments = $"-NoProfile -NonInteractive -ExecutionPolicy Bypass -EncodedCommand {base64}",
                CreateNoWindow = true,
                UseShellExecute = false,
                RedirectStandardOutput = true,
                WindowStyle = ProcessWindowStyle.Hidden
            };

            using var process = Process.Start(startInfo);
            if (process == null) return null;

            var output = process.StandardOutput.ReadToEnd().Trim();
            process.WaitForExit();

            return !string.IsNullOrEmpty(output) && Directory.Exists(output) ? output : null;
        }
        catch (Exception ex)
        {
            MelonLogger.Warning($"[FolderDialogUtil] Windows folder dialog error: {ex.Message}");
            return null;
        }
    }

    private static string? OpenMacFolderBrowser(string initialDirectory)
    {
        try
        {
            var escaped = initialDirectory.Replace("\"", "\\\"");
            var script = $"POSIX path of (choose folder with prompt \"Select Output Directory\" default location \"{escaped}\")";

            var startInfo = new ProcessStartInfo
            {
                FileName = "osascript",
                CreateNoWindow = true,
                UseShellExecute = false,
                RedirectStandardOutput = true,
                WindowStyle = ProcessWindowStyle.Hidden
            };
            startInfo.ArgumentList.Add("-e");
            startInfo.ArgumentList.Add(script);

            using var process = Process.Start(startInfo);
            if (process == null) return null;

            var output = process.StandardOutput.ReadToEnd().Trim();
            process.WaitForExit();

            return !string.IsNullOrEmpty(output) && Directory.Exists(output) ? output : null;
        }
        catch
        {
            return null;
        }
    }

    private static string? OpenLinuxFolderBrowser(string initialDirectory)
    {
        try
        {
            var startInfo = new ProcessStartInfo
            {
                FileName = "zenity",
                CreateNoWindow = true,
                UseShellExecute = false,
                RedirectStandardOutput = true,
                WindowStyle = ProcessWindowStyle.Hidden
            };
            startInfo.ArgumentList.Add("--file-selection");
            startInfo.ArgumentList.Add("--directory");
            startInfo.ArgumentList.Add("--title=Select Output Directory");
            if (!string.IsNullOrEmpty(initialDirectory) && Directory.Exists(initialDirectory))
            {
                startInfo.ArgumentList.Add($"--filename={initialDirectory}");
            }

            using var process = Process.Start(startInfo);
            if (process == null) return null;

            var output = process.StandardOutput.ReadToEnd().Trim();
            process.WaitForExit();

            return !string.IsNullOrEmpty(output) && Directory.Exists(output) ? output : null;
        }
        catch
        {
            return null;
        }
    }
}