using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using MelonLoader;

namespace ADOFAIRenderer.Util
{
    public static class OSNotification
    {
        /// <summary>
        /// Sends a native desktop notification on Windows, macOS, or Linux.
        /// If a folder path is provided, it attempts to add an action button to open the folder on Windows and Linux.
        /// </summary>
        public static void Show(string title, string message, string? folderPath = null)
        {
            try
            {
                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                {
                    ShowWindowsNotification(title, message, folderPath);
                }
                else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
                {
                    ShowMacNotification(title, message);
                }
                else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
                {
                    ShowLinuxNotification(title, message, folderPath);
                }
            }
            catch (Exception ex)
            {
                MelonLogger.Warning($"[OSNotification] 알림을 보내지 못했습니다: {ex.Message}");
            }
        }

        private static void ShowWindowsNotification(string title, string message, string? folderPath)
        {
            // XML-escape the title and message to prevent XML syntax errors (e.g. from '&', '<', '>', '"', '\'')
            string xmlTitle = System.Security.SecurityElement.Escape(title)!;
            string xmlMessage = System.Security.SecurityElement.Escape(message)!;

            string toastXml;
            string psScript;

            if (!string.IsNullOrEmpty(folderPath))
            {
                var nonNullFolder = folderPath;
                var escapedFolder = nonNullFolder.Replace("'", "''");
                
                // UWP Toast XML using protocol activation.
                // Clicking the body (launch) or the button (arguments) will invoke the custom 'adofai-renderer://' protocol.
                toastXml = $@"
<toast launch=""adofai-renderer://"" activationType=""protocol"">
  <visual>
    <binding template=""ToastGeneric"">
      <text>{xmlTitle}</text>
      <text>{xmlMessage}</text>
    </binding>
  </visual>
  <actions>
    <action content=""렌더 폴더 열기"" arguments=""adofai-renderer://"" activationType=""protocol""/>
  </actions>
</toast>
".Replace("\r\n", "").Replace("\n", "").Trim();

                // Build a PowerShell script that registers a custom protocol 'adofai-renderer' in HKCU (no admin rights needed),
                // mapping it to invoke PowerShell and open the folder, then sends the notification and exits immediately.
                psScript = 
                    $"$protocolPath = 'HKCU:\\Software\\Classes\\adofai-renderer';\n" +
                    $"if (-not (Test-Path $protocolPath)) {{\n" +
                    $"  $null = New-Item -Path $protocolPath -Force;\n" +
                    $"  $null = New-ItemProperty -Path $protocolPath -Name 'URL Protocol' -Value '' -PropertyType String -Force;\n" +
                    $"}}\n" +
                    $"Set-Item -Path $protocolPath -Value 'URL:adofai-renderer Protocol' | Out-Null;\n" +
                    $"$cmdPath = \"$protocolPath\\shell\\open\\command\";\n" +
                    $"if (-not (Test-Path $cmdPath)) {{ $null = New-Item -Path $cmdPath -Force; }}\n" +
                    $"$command = 'powershell.exe -NoProfile -NonInteractive -WindowStyle Hidden -Command \"Invoke-Item ''{escapedFolder}''\"';\n" +
                    $"Set-Item -Path $cmdPath -Value $command | Out-Null;\n" +
                    $"[Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] | Out-Null;\n" +
                    $"$xml = [Windows.Data.Xml.Dom.XmlDocument]::new();\n" +
                    $"$xml.LoadXml('{toastXml}');\n" +
                    $"[Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier('ADOFAI Renderer').Show([Windows.UI.Notifications.ToastNotification]::new($xml))";
            }
            else
            {
                // Simple UWP Toast XML without actions.
                toastXml = $@"
<toast>
  <visual>
    <binding template=""ToastGeneric"">
      <text>{xmlTitle}</text>
      <text>{xmlMessage}</text>
    </binding>
  </visual>
</toast>
".Replace("\r\n", "").Replace("\n", "").Trim();

                psScript = 
                    $"[Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] | Out-Null;\n" +
                    $"$xml = [Windows.Data.Xml.Dom.XmlDocument]::new();\n" +
                    $"$xml.LoadXml('{toastXml}');\n" +
                    $"[Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier('ADOFAI Renderer').Show([Windows.UI.Notifications.ToastNotification]::new($xml))";
            }

            // Encode the script to UTF-16LE Base64 and run it via PowerShell -EncodedCommand.
            // This guarantees that any special characters (double quotes, backslashes, ampersands, etc.) in the title/message
            // do not break the command-line parsing or cause syntax errors.
            byte[] bytes = System.Text.Encoding.Unicode.GetBytes(psScript);
            string base64 = Convert.ToBase64String(bytes);

            RunProcess("powershell.exe", $"-NoProfile -NonInteractive -EncodedCommand {base64}");
        }

        private static void ShowMacNotification(string title, string message)
        {
            string escapedTitle = title.Replace("\"", "\\\"");
            string escapedMessage = message.Replace("\"", "\\\"");

            string args = $"-e \"display notification \\\"{escapedMessage}\\\" with title \\\"{escapedTitle}\\\"\"";
            RunProcess("osascript", args);
        }

        private static void ShowLinuxNotification(string title, string message, string? folderPath)
        {
            var escapedTitle = title.Replace("\"", "\\\"");
            var escapedMessage = message.Replace("\"", "\\\"");

            if (!string.IsNullOrEmpty(folderPath))
            {
                var nonNullFolder = folderPath;
                // Linux notify-send supports action buttons since v1.2.
                // It prints the action name to standard output when clicked.
                var args = $"-a \"ADOFAI Renderer\" --action=\"open_folder=렌더 폴더 열기\" \"{escapedTitle}\" \"{escapedMessage}\"";
                
                System.Threading.Tasks.Task.Run(() =>
                {
                    try
                    {
                        var startInfo = new ProcessStartInfo
                        {
                            FileName = "notify-send",
                            Arguments = args,
                            CreateNoWindow = true,
                            UseShellExecute = false,
                            RedirectStandardOutput = true,
                            WindowStyle = ProcessWindowStyle.Hidden
                        };

                        using var process = new Process();
                        process.StartInfo = startInfo;
                        process.Start();
                        string output = process.StandardOutput.ReadToEnd().Trim();
                        // If user clicked the button, open the folder using default file manager
                        if (output == "open_folder")
                        {
                            RunProcess("xdg-open", $"\"{nonNullFolder.Replace("\"", "\\\"")}\"");
                        }
                    }
                    catch (Exception ex)
                    {
                        MelonLogger.Warning($"[OSNotification] 리눅스 알림 처리 실패: {ex.Message}");
                    }
                });
            }
            else
            {
                var args = $"-a \"ADOFAI Renderer\" \"{escapedTitle}\" \"{escapedMessage}\"";
                RunProcess("notify-send", args);
            }
        }

        private static void RunProcess(string fileName, string arguments)
        {
            var startInfo = new ProcessStartInfo
            {
                FileName = fileName,
                Arguments = arguments,
                CreateNoWindow = true,       // CREATE_NO_WINDOW flag
                UseShellExecute = false,     // Direct execution
                WindowStyle = ProcessWindowStyle.Hidden
            };

            using var process = new Process();
            process.StartInfo = startInfo;
            process.Start();
        }
    }
}