using UnityEngine;
using System.Linq;
using System.Collections;
using VA;


public class VAUListener : MonoBehaviour {

    public string listenername = "Listener";
    public int maxreverbZones = 2;
    public string VAAudioRenderer = "MyBinauralArtificialReverb";
    private int Listener;
    private VANet _VA = null;
    private Quaternion q;
    private Transform t;
    private AudioReverbZone[] reverbZones;
    private float currentArtificialReverberationTime = 0f;
    private float shadowReverbTime;
    private VAUAuralizationMode globalAuraMode;

    public delegate void ReverbTimeChangedDelegate(double reverbTime);
    public event ReverbTimeChangedDelegate ReverbTimeChanged;

    public int ID
    {
        get
        {
            return Listener;
        }
    }

    // Use this for initialization
    void Start()
    {
        _VA = VAUAdapter.VA;
        Listener = _VA.CreateListener(listenername);
        listenername += " " + Listener;
        _VA.SetListenerAuralizationMode(Listener, "all");
        Debug.Log("[VAU]" + listenername + " created");
        _VA.SetListenerHRIRDataset(Listener, VAUAdapter.DefaultHRIR);
        SetListenerPositionOrientation();
        _VA.SetArtificalReverbarationTime(VAAudioRenderer, 0.3f);
        reverbZones = FindObjectsOfType(typeof(AudioReverbZone)) as AudioReverbZone[];
        globalAuraMode = FindObjectOfType<VAUAdapter>().gameObject.GetComponent<VAUAuralizationMode>();
    }

    void OnEnable()
    {
        if (GetComponent<VAUAuralizationMode>() != null)
            GetComponent<VAUAuralizationMode>().AuraStringChanged += OnListenerAuralizationModeChanged;
    }
	
	// Update is called once per frame
	void Update ()
    {
        SetListenerPositionOrientation();
        SetActiveReverbZones();
    }

    //uses the View- and Up-Vector to transmit the position of the listener to VA
    void SetListenerPositionOrientation()
    {
        _VA = VAUAdapter.VA;
        t = GetComponent<Transform>();
        q = t.rotation;
        Vector3 up = q * Vector3.up;
        Vector3 view = q * Vector3.forward;
        Vector3 view_ogl = new Vector3(view.x, view.y, -view.z);
        Vector3 up_ogl = new Vector3(up.x, up.y, -up.z);
        _VA.SetListenerPosition(Listener, t.transform.position.x, t.transform.position.y, -t.transform.position.z);
        _VA.SetListenerOrientationVU(Listener, view_ogl.x, view_ogl.y, view_ogl.z, up_ogl.x, up_ogl.y, up_ogl.z);
    }

    void SetActiveReverbZones()
    {
        if (reverbZones == null)
            return;

        float actReverbTime = 0f;
        int i = 0;
        foreach (AudioReverbZone reverbZone in reverbZones)
        {
            if (i >= maxreverbZones)
                break;
            float actDistance = Vector3.Distance(reverbZone.transform.position, gameObject.transform.position);
            if ((actDistance < reverbZone.maxDistance))
            {
                if (actDistance > reverbZone.minDistance)
                {
                    actReverbTime += reverbZone.decayTime * (reverbZone.maxDistance - actDistance) / (reverbZone.maxDistance - reverbZone.minDistance);
                }
                else
                {
                    actReverbTime += reverbZone.decayTime;
                }
                i++;
            }
        }
        if (shadowReverbTime == actReverbTime)
            return;

        
        if (actReverbTime < 0.3f)
            globalAuraMode.DiffuseDecay = false;
        else
            globalAuraMode.DiffuseDecay = true;

        shadowReverbTime = actReverbTime;

        if (i > 0)
            actReverbTime /= i;

        if (ReverbTimeChanged != null)
            ReverbTimeChanged(actReverbTime);

        _VA.SetArtificalReverbarationTime(VAAudioRenderer, actReverbTime);

    }

    void OnListenerAuralizationModeChanged(string AuraMode)
    {
        _VA.SetListenerAuralizationMode(Listener, AuraMode);
    }

    void OnDisable()
    {
        if (GetComponent<VAUAuralizationMode>() != null)
            GetComponent<VAUAuralizationMode>().AuraStringChanged -= OnListenerAuralizationModeChanged;
    }

    void OnDestroy()
    {
        if (_VA.IsConnected())
        {
            _VA.DeleteListener(Listener);
        }
    }
}