using NAudio.CoreAudioApi;
using NAudio.CoreAudioApi.Interfaces;
using System;
using System.Threading;

namespace VolumeAdjuster
{
    class Program
    {
        private static DateTime lastVolumeChangeTime = DateTime.MinValue;
        private static bool volumeAdjusted = false;
        private static int channelToAdjust = 0; // 0 for left, 1 for right
        private static float adjustmentPercentage = 0.75f; // 25% lower

        static void Main(string[] args)
        {
            Console.WriteLine("Which channel should be lower? (0 for left, 1 for right):");
            channelToAdjust = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("By what percentage should the selected channel be lower? (Enter a value between 0 and 100):");
            adjustmentPercentage = 1 - (Convert.ToSingle(Console.ReadLine()) / 100);

            AdjustVolumeOnUserChange();
        }

        static void AdjustVolumeOnUserChange()
        {
            var deviceEnumerator = new MMDeviceEnumerator();
            var defaultDevice = deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);

            defaultDevice.AudioEndpointVolume.OnVolumeNotification += AudioEndpointVolume_OnVolumeNotification;

            Console.WriteLine("Listening for volume changes. Press any key to exit...");
            Console.ReadKey(); // Keep the application running
        }

        private static void AudioEndpointVolume_OnVolumeNotification(AudioVolumeNotificationData data)
        {
            if (volumeAdjusted)
            {
                return;
            }

            DateTime now = DateTime.Now;

            // Delay for at least 1 second between changes
            if ((now - lastVolumeChangeTime).TotalSeconds < 1)
            {
                return;
            }

            if (data.Muted == false && data.MasterVolume > 0) // Ensure volume is not muted and greater than zero
            {
                float currentVolume = data.MasterVolume; // Get the current master volume
                float adjustedVolume = currentVolume * adjustmentPercentage; // Adjust the volume

                // Adjust the selected channel volume
                var deviceEnumerator = new MMDeviceEnumerator();
                var defaultDevice = deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
                defaultDevice.AudioEndpointVolume.Channels[channelToAdjust].VolumeLevelScalar = adjustedVolume;

                Console.WriteLine($"Volume changed. Master Volume: {currentVolume * 100}%, Adjusted Channel: {adjustedVolume * 100}%");

                // Update the last volume change time and set the flag
                lastVolumeChangeTime = DateTime.Now;
                volumeAdjusted = true;
            }

            // Reset the volumeAdjusted flag after 2 seconds to allow further adjustments
            Timer timer = new Timer(ResetVolumeAdjustedFlag, null, 2000, Timeout.Infinite);
        }

        private static void ResetVolumeAdjustedFlag(object state)
        {
            volumeAdjusted = false;
        }
    }
}