using UnityEngine;
using System.Collections;

/*
-----------------------
 
 AmbienceEmitter()
 
-----------------------
*/
public class AmbienceEmitter : MonoBehaviour {

	public SoundFXRef[]		ambientSounds = new SoundFXRef[0];
	public bool				autoActivate = true;
	[Tooltip("Automatically play the sound randomly again when checked.  Should be OFF for looping sounds")]
	public bool				autoRetrigger = true;
	[MinMax( 2.0f, 4.0f, 0.1f, 10.0f )]
	public Vector2			randomRetriggerDelaySecs = new Vector2( 2.0f, 4.0f );
	[Tooltip( "If defined, the sounds will randomly play from these transform positions, otherwise the sound will play from this transform" )]
	public Transform[]		playPositions = new Transform[0];
	private bool			activated = false;
	private int				playingIdx = -1;
	private float			nextPlayTime = 0.0f;
	private float			fadeTime = 0.25f;
	private int				lastPosIdx = -1;

	/*
	-----------------------
	Awake()
	-----------------------
	*/
	void Awake() {
		if ( autoActivate ) {
			activated = true;
			nextPlayTime = Time.time + Random.Range( randomRetriggerDelaySecs.x, randomRetriggerDelaySecs.y );
		}
		// verify all the play positions are valid
		foreach ( Transform t in playPositions ) {
			if ( t == null ) {
				Debug.LogWarning( "[AmbienceEmitter] Invalid play positions in " + name );
				playPositions = new Transform[0];
				break;
			}
		}
	}

	/*
	-----------------------
	Update()
	-----------------------
	*/
	void Update() {
		if ( activated ) {
			if ( ( playingIdx == -1 ) || autoRetrigger ) {
				if ( Time.time >= nextPlayTime ) {
					Play();
					if ( !autoRetrigger ) {
						activated = false;
					}
				}
			}
		}
	}

	/*
	-----------------------
	OnTriggerEnter()
	-----------------------
	*/
	public void OnTriggerEnter( Collider col ) {
		activated = !activated;
	}

	/*
	-----------------------
	Play()
	-----------------------
	*/
	public void Play() {
		Transform transformToPlayFrom = transform;
		if ( playPositions.Length > 0 ) {
			int idx = Random.Range( 0, playPositions.Length );
			while ( ( playPositions.Length > 1 ) && ( idx == lastPosIdx ) ) {
				 idx = Random.Range( 0, playPositions.Length );
			}
			transformToPlayFrom = playPositions[idx];
			lastPosIdx = idx;
		}
		playingIdx = ambientSounds[Random.Range(0, ambientSounds.Length)].PlaySoundAt( transformToPlayFrom.position );
		if ( playingIdx != -1 ) {
			AudioManager.FadeInSound( playingIdx, fadeTime );
			nextPlayTime = Time.time + Random.Range( randomRetriggerDelaySecs.x, randomRetriggerDelaySecs.y );
		}
	}

	/*
	-----------------------
	EnableEmitter()
	-----------------------
	*/
	public void EnableEmitter( bool enable ) {
		activated = enable;
		if ( enable ) {
			Play();
		} else {
			if ( playingIdx != -1 ) {
				AudioManager.FadeOutSound( playingIdx, fadeTime );
			}
		}

	}

}