using System.Collections.Generic;
using UnityEngine;

namespace OCES.Audio
{
    public class VolumeStepResolver
    {
        readonly Dictionary<uint, int> m_volumeStepCounts = new();
        readonly Dictionary<uint, double> m_volumeStepLastTime = new();

        internal float ResolveVolume(AudioObject audioObject, double time)
        {
            // 计算一下配置的音量是多少
            float baseVolume = Mathf.Pow(10,audioObject.Volume / 20f); 
            
            // 优化版。看看表现，要是确实Mathf.Pow造成性能卡点了就用这个。
            //float baseVolume = audioObject.Volume == 0 ? 1f : Mathf.Pow(10,audioObject.Volume / 20f); 
            
            if (audioObject.VolumeStepThreshold == 0) //没配置VolumeStep
            {
                return baseVolume;
            }

            // 超时了，或者没播过
            if (!this.m_volumeStepLastTime.TryGetValue(audioObject.Id, out double lastVolumeStepTime)
                || time - lastVolumeStepTime > audioObject.VolumeStepThreshold)
            {
                this.m_volumeStepCounts[audioObject.Id] = 0;
                this.m_volumeStepLastTime[audioObject.Id] = time;
                return baseVolume;
            }
            
            //命中了
            int volumeStepCount = this.m_volumeStepCounts[audioObject.Id];
            volumeStepCount = this.m_volumeStepCounts[audioObject.Id] = volumeStepCount + 1;
            this.m_volumeStepLastTime[audioObject.Id] = time;
            return Mathf.Clamp(Mathf.Pow(10, (audioObject.Volume + audioObject.VolumeStep * volumeStepCount) / 20f), 0f, 1f);
        }
    }
}