using Unity.BossRoom.Utils;
using UnityEngine;
using UnityEngine.Audio;

namespace Unity.BossRoom.Audio
{
    /// <summary>
    /// Initializes the game's AudioMixer to use volumes stored in preferences. Provides
    /// a public function that can be called when these values change.
    /// </summary>
    public class AudioMixerConfigurator : MonoBehaviour
    {
        [SerializeField]
        private AudioMixer m_Mixer;

        [SerializeField]
        private string m_MixerVarMainVolume = "OverallVolume";

        [SerializeField]
        private string m_MixerVarMusicVolume = "MusicVolume";

        public static AudioMixerConfigurator Instance { get; private set; }

        /// <summary>
        /// The audio sliders use a value between 0.0001 and 1, but the mixer works in decibels -- by default, -80 to 0.
        /// To convert, we use log10(slider) multiplied by 20. Why 20? because log10(.0001)*20=-80, which is the
        /// bottom range for our mixer, meaning it's disabled.
        /// </summary>
        private const float k_VolumeLog10Multiplier = 20;

        private void Awake()
        {
            Instance = this;
            DontDestroyOnLoad(gameObject);
        }

        private void Start()
        {
            // note that trying to configure the AudioMixer during Awake does not work, must be initialized in Start
            Configure();
        }

        public void Configure()
        {
            m_Mixer.SetFloat(m_MixerVarMainVolume, GetVolumeInDecibels(ClientPrefs.GetMasterVolume()));
            m_Mixer.SetFloat(m_MixerVarMusicVolume, GetVolumeInDecibels(ClientPrefs.GetMusicVolume()));
        }

        private float GetVolumeInDecibels(float volume)
        {
            if (volume <= 0) // sanity-check in case we have bad prefs data
            {
                volume = 0.0001f;
            }
            return Mathf.Log10(volume) * k_VolumeLog10Multiplier;
        }
    }
}