using Toak.Core.Interfaces;

namespace Toak.Core;

public class StateTracker : IRecordingStateTracker
{
    private readonly string _stateFilePath = Constants.Paths.StateFile;

    public bool IsRecording()
    {
        return File.Exists(_stateFilePath);
    }

    public void SetRecording(int ffmpegPid)
    {
        Logger.LogDebug($"Setting recording state with PID {ffmpegPid}");
        File.WriteAllText(_stateFilePath, $"{ffmpegPid}\n{DateTime.UtcNow.Ticks}");
    }

    public int? GetRecordingPid()
    {
        if (File.Exists(_stateFilePath))
        {
            var lines = File.ReadAllLines(_stateFilePath);
            if (lines.Length > 0 && int.TryParse(lines[0], out var pid))
            {
                Logger.LogDebug($"Read recording PID {pid} from state file");
                return pid;
            }
        }
        return null;
    }

    public DateTime? GetRecordingStartTime()
    {
        if (File.Exists(_stateFilePath))
        {
            var lines = File.ReadAllLines(_stateFilePath);
            if (lines.Length > 1 && long.TryParse(lines[1], out var ticks))
            {
                return new DateTime(ticks, DateTimeKind.Utc);
            }
        }
        return null;
    }

    public void ClearRecording()
    {
        if (File.Exists(_stateFilePath))
        {
            Logger.LogDebug("Clearing recording state file");
            File.Delete(_stateFilePath);
        }
    }
}