using System.Diagnostics;
using Toak.Core;
using Toak.Core.Interfaces;

namespace Toak.Audio;

public class FfmpegAudioRecorder(IRecordingStateTracker stateTracker, INotifications notifications) : IAudioRecorder
{
    private readonly string _wavPath = Constants.Paths.RecordingWavFile;
    private readonly IRecordingStateTracker _stateTracker = stateTracker;
    private readonly INotifications _notifications = notifications;

    public string GetWavPath() => _wavPath;

    public void StartRecording()
    {
        if (File.Exists(_wavPath))
        {
            Logger.LogDebug($"Deleting old audio file: {_wavPath}");
            File.Delete(_wavPath);
        }

        Logger.LogDebug("Starting ffmpeg to record audio...");

        var pInfo = new ProcessStartInfo
        {
            FileName = Constants.Commands.AudioFfmpeg,
            Arguments = $"-f pulse -i default -ac 1 -ar 16000 \"{_wavPath}\"",
            UseShellExecute = false,
            CreateNoWindow = true,
            RedirectStandardOutput = true,
            RedirectStandardError = true
        };

        var process = Process.Start(pInfo);
        if (process != null)
        {
            _stateTracker.SetRecording(process.Id);
            _notifications.Notify("Recording Started (FFmpeg)");
        }
    }

    public void StopRecording()
    {
        var pid = _stateTracker.GetRecordingPid();
        if (!pid.HasValue) return;
        Logger.LogDebug($"Found active ffmpeg process with PID {pid.Value}. Attempting to stop...");
        try
        {
            var process = Process.GetProcessById(pid.Value);
            if (process.HasExited) return;
            // Gracefully stop ffmpeg using SIGINT to ensure WAV headers are finalizing cleanly
            Process.Start(new ProcessStartInfo
            {
                FileName = Constants.Commands.ProcessKill,
                Arguments = $"-INT {pid.Value}",
                CreateNoWindow = true,
                UseShellExecute = false
            })?.WaitForExit();

            process.WaitForExit(2000); // give it a moment to flush
        }
        catch (Exception ex)
        {
            // Process might already be dead
            Console.WriteLine($"[FfmpegAudioRecorder] Error stopping ffmpeg: {ex.Message}");
        }
        finally
        {
            _stateTracker.ClearRecording();
        }
    }
}