extends Tween

const fadeMusicTime = 0.8;
const lowVolume = - 80;
const defaultVolume:float = 0.0;
var bgmStream:AudioStreamPlayer;

var darkChild:Sprite;

func _ready():
	bgmStream = self.get_child(0);
	bgmStream.bus = "BGM";
	
	loopEnable = false;

func PlayBGM(bgmPath):
	PrepareLoopVersion(bgmPath);

	bgmStream.volume_db = lowVolume;
	bgmStream.stream = load(bgmPath);
	
	var _temp = self.interpolate_property(bgmStream, "volume_db", lowVolume, defaultVolume, fadeMusicTime, Tween.TRANS_EXPO, 0)
	if bgmPath == "res://resources/audio/bgm/25.ogg":
		bgmStream.play(1.5);
	else :
		bgmStream.play(0.0);
	_temp = self.start();

func StopBGM():

	var _temp = self.interpolate_property(bgmStream, "volume_db", defaultVolume, lowVolume, fadeMusicTime, Tween.TRANS_LINEAR, 0)
	_temp = self.start();
	loopEnable = false
	yield (self, "tween_all_completed");
	if bgmStream.stream != null:
		bgmStream.stream.resource_path = ""
	bgmStream.stream = null;

func ChangeBGM(bgmPath2):
	if bgmStream.stream != null and bgmStream.stream.resource_path == bgmPath2:
		return ;
	
	var bgmPath3 = bgmPath2.trim_suffix(".ogg") + "_loop.ogg"
	
	if bgmStream.stream.resource_path == bgmPath2 or bgmStream.stream.resource_path == bgmPath3:
		return ;

	StopBGM();
	yield (self, "tween_all_completed")
	PlayBGM(bgmPath2);

func SetNextTriptych(bgmPath):
	loopEnable = true;
	bgmStream.stream.set_loop_mode(0);
	loopVersionPath = bgmPath;

var dict = {
	"res://resources/audio/bgm/14.ogg":"res://resources/audio/bgm/14_loop.ogg", 
	"res://resources/audio/bgm/17.ogg":"res://resources/audio/bgm/17_loop.ogg", 
	"res://resources/audio/bgm/18.ogg":"res://resources/audio/bgm/18_loop.ogg", 
	"res://resources/audio/bgm/19.ogg":"res://resources/audio/bgm/19_loop.ogg", 
	"res://resources/audio/bgm/20.ogg":"res://resources/audio/bgm/20_loop.ogg", 
	"res://resources/audio/bgm/21.ogg":"res://resources/audio/bgm/21_loop.ogg", 
	"res://resources/audio/bgm/22.ogg":"res://resources/audio/bgm/22_loop.ogg", 
	"res://resources/audio/bgm/23.ogg":"res://resources/audio/bgm/23_loop.ogg", 
	"res://resources/audio/bgm/26.ogg":"res://resources/audio/bgm/26_loop.ogg", 
}

var loopEnable;
var loopVersionPath;

func PrepareLoopVersion(bgmPath):
	if dict.has(bgmPath):
		loopVersionPath = dict[bgmPath];
		loopEnable = true;
	else :
		loopVersionPath = "";
		loopEnable = false;




func _on_BGMStreamPlayer_finished():
	if loopEnable:
		bgmStream.stream = load(loopVersionPath);
		bgmStream.play(0.0);
		loopEnable = false;