using System.Collections.Generic;
using System.Linq;
using UnityEngine;

[RequireComponent(typeof(AudioSource))]
public class MicrophoneInput : MonoBehaviour
{
    //每秒种产生0.4M数据量
    private LinkedList<float> recordData = new LinkedList<float>();
    private AudioClip microphoneClip;
    private float voiceDetectLevel = 0.2f;

    private void Start()
    {
        startMicRecord();
    }

    private void startMicRecord()
    {
        recordData.Clear();
        isRecordingMic = false;
        microphoneClip = Microphone.Start(null, true, 600, 44100);
        while (!(Microphone.GetPosition(null) > 0))
        {
        }
        Loom.StartSingleThread(getMicData);
    }

    private int lastReadPositio = 0;
    private float myMax;
    private bool isRecordingMic = false;
    private float clipPlayTime;

    private void getMicData()
    {
        Loom.WaitForSeconds(0.4f);
        //todo 加载数据并分析
        int currentPosition = Microphone.GetPosition(null);
        int sz = currentPosition - lastReadPositio;
        if (sz > 1)
        {
            float[] d = new float[(sz - 1)];
            microphoneClip.GetData(d, lastReadPositio);
            float maxValue = 0;
            foreach (float s in d)
            {
                maxValue = maxValue > Mathf.Abs(s) ? maxValue : Mathf.Abs(s);
            }
            myMax = maxValue;
            if (isRecordingMic)
            {
                if (myMax < voiceDetectLevel)
                {
                    //nobody is talking.
                    //todo maybe to relay the recored data.
                    Loom.DispatchToMainThread(replayRecoredData);
                    return;
                }
                foreach (float f in d)
                {
                    recordData.AddLast(f);
                }
            }
            else
            {
                if (myMax > voiceDetectLevel)
                {
                    isRecordingMic = true;
                    recordData.Clear();
                    foreach (float f in d)
                    {
                        recordData.AddLast(f);
                    }
                }
            }
        }
        lastReadPositio = currentPosition;
        //
        getMicData();
    }

    public void replayRecoredData()
    {
        Microphone.End(null);
        float[] clipFloats = new float[recordData.Count];
        int i = 0;
        foreach (var f in recordData)
        {
            clipFloats[i] = f;
            i++;
        }
        AudioClip myClip = AudioClip.Create("tom", clipFloats.Length, 1, 44100, false, false);
        myClip.SetData(clipFloats, 0);
        audio.clip = myClip;
        audio.Play();
        audio.loop = false;
        audio.pitch = 1.2f;
        clipPlayTime = clipFloats.Length / 44100.0f;
        Loom.StartSingleThread(waitToRestartMic);

    }

    private void waitToRestartMic()
    {
        Loom.WaitForSeconds(clipPlayTime);
        startMicRecord();
    }

    private void OnGUI()
    {
        GUI.Label(new Rect(10, 10 * 2, 100, 20), "audio" + audio);
        //        GUI.Label(new Rect(10, 10 * 3, 100, 20), "audio" + audio.clip);
        //        GUI.Label(new Rect(10, 10 * 4, 100, 20), "audio" + audio.clip.samples);
        //        GUI.Label(new Rect(10, 10 * 5, 100, 20), "audio" + audio.clip.samples.ToString());
        GUI.Label(new Rect(10, 10 * 6, 100, 20), "mic pos:" + Microphone.GetPosition(null));
        GUI.Label(new Rect(10, 10 * 7, 100, 20), "myMax:" + myMax);
        GUI.Label(new Rect(10, 10 * 8, 100, 20), "recordData:" + recordData.Count());

    }
}