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

namespace Shared.Engine
{
    /// <summary>
    /// https://github.com/BtbN/FFmpeg-Builds/releases
    /// </summary>
    public static class FFmpeg
    {
        #region InitializationAsync
        static bool disableInstall = false;

        async public static Task<bool> InitializationAsync()
        {
            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
            {
                #region Windows
                if (File.Exists("data/ffmpeg.exe") && File.Exists("data/ffprobe.exe"))
                {
                    Console.WriteLine("FFmpeg: Initialization");
                    return true;
                }

                if (RuntimeInformation.ProcessArchitecture != Architecture.X64 && RuntimeInformation.ProcessArchitecture != Architecture.Arm64)
                {
                    Console.WriteLine("FFmpeg: Architecture unknown");
                    return false;
                }

                if (disableInstall)
                    return true;

                disableInstall = true;
                string arh = RuntimeInformation.ProcessArchitecture == Architecture.X64 ? "64" : "arm64";

                foreach (string fileName in new string[] { "ffmpeg", "ffprobe" })
                {
                    if (File.Exists($"data/{fileName}.exe"))
                        continue;

                    if (!await Http.DownloadFile($"https://github.com/immisterio/ffmpeg/releases/download/ffmpeg2/{fileName}-win{arh}-gpl.exe", $"data/{fileName}.exe"))
                        File.Delete($"data/{fileName}.exe");
                }

                bool success = File.Exists("data/ffmpeg.exe") && File.Exists("data/ffprobe.exe");

                Console.WriteLine(success ? "FFmpeg: Initialization" : "FFmpeg: error download");
                disableInstall = false;
                return success;
                #endregion
            }
            else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
            {
                #region Linux
                if ((File.Exists("data/ffmpeg") && File.Exists("data/ffprobe")) || File.Exists("/bin/ffmpeg"))
                {
                    Console.WriteLine("FFmpeg: Initialization");
                    return true;
                }

                string version = await Bash.Run("ffmpeg -version");
                if (version == null || !version.Contains("FFmpeg developers"))
                {
                    if (disableInstall)
                        return true;

                    disableInstall = true;

                    if (RuntimeInformation.ProcessArchitecture == Architecture.X64 || RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
                    {
                        string arh = RuntimeInformation.ProcessArchitecture == Architecture.X64 ? "64" : "arm64";

                        foreach (string fileName in new string[] { "ffmpeg", "ffprobe" })
                        {
                            if (File.Exists($"data/{fileName}"))
                                continue;

                            if (!await Http.DownloadFile($"https://github.com/immisterio/ffmpeg/releases/download/ffmpeg2/{fileName}-linux{arh}-gpl", $"data/{fileName}"))
                            {
                                File.Delete($"data/{fileName}");
                                continue;
                            }

                            Bash.Invoke($"chmod +x {Path.Join(Directory.GetCurrentDirectory(), $"data/{fileName}")}");
                        }

                        bool success = File.Exists("data/ffmpeg") && File.Exists("data/ffprobe");

                        await Task.Delay(1000); // Wait for chmod to complete
                        Console.WriteLine(success ? "FFmpeg: Initialization" : "FFmpeg: error download");
                        disableInstall = false;
                        return success;
                    }
                    else
                    {
                        await Bash.Run("apt update && apt install -y ffmpeg");
                        version = await Bash.Run("ffmpeg -version");
                        if (version == null || !version.Contains("FFmpeg developers"))
                        {
                            Console.WriteLine("FFmpeg: error install ffmpeg");
                            disableInstall = false;
                            return false;
                        }
                    }
                }

                Console.WriteLine("FFmpeg: Initialization");
                return true;
                #endregion
            }

            Console.WriteLine("FFmpeg: OS unknown");
            return false;
        }
        #endregion

        #region RunAsync
        async public static ValueTask<(string outputData, string errorData)> RunAsync(string comand, string workingDirectory = null, ProcessPriorityClass? priorityClass = null)
        {
            try
            {
                var process = new Process();
                process.StartInfo.UseShellExecute = false;
                process.StartInfo.RedirectStandardOutput = true;
                process.StartInfo.RedirectStandardError = true;
                process.StartInfo.FileName = AppInit.Win32NT ? "data/ffmpeg.exe" : File.Exists("data/ffmpeg") ? "data/ffmpeg" : "ffmpeg";
                process.StartInfo.Arguments = comand;
                process.StartInfo.WorkingDirectory = workingDirectory;
                process.Start();

                if (priorityClass != null)
                {
                    try
                    {
                        process.PriorityClass = (ProcessPriorityClass)priorityClass;
                    }
                    catch (InvalidOperationException)
                    {
                        // Процесс завершился до установки приоритета
                    }
                    catch(Exception ex)
                    {
                        Console.WriteLine("FFmpeg: " + ex.Message);
                    }
                }

                string outputData = string.Empty, errorData = string.Empty;

                process.OutputDataReceived += (sender, args) =>
                {
                    if (!string.IsNullOrEmpty(args.Data))
                        outputData += args.Data + "\n";
                };

                process.ErrorDataReceived += (sender, args) =>
                {
                    if (!string.IsNullOrEmpty(args.Data))
                        errorData += args.Data + "\n";
                };

                process.BeginOutputReadLine();
                process.BeginErrorReadLine();

                await process.WaitForExitAsync();

                return (outputData, errorData);
            }
            catch 
            {
                return default;
            }
        }
        #endregion
    }
}