Funkin/source/funkin/MusicBeatSubstate.hx

package funkin;

import flixel.FlxSubState;
import flixel.util.FlxColor;
import funkin.Conductor.BPMChangeEvent;
import funkin.modding.events.ScriptEvent;
import funkin.modding.module.ModuleHandler;

/**
 * MusicBeatSubstate reincorporates the functionality of MusicBeatState into an FlxSubState.
 */
class MusicBeatSubstate extends FlxSubState
{
	public function new(bgColor:FlxColor = FlxColor.TRANSPARENT)
	{
		super(bgColor);
	}

	private var curStep:Int = 0;
	private var curBeat:Int = 0;
	private var controls(get, never):Controls;

	inline function get_controls():Controls
		return PlayerSettings.player1.controls;

	override function update(elapsed:Float)
	{
		// everyStep();
		var oldStep:Int = curStep;

		updateCurStep();
		curBeat = Math.floor(curStep / 4);

		if (oldStep != curStep && curStep >= 0)
			stepHit();

		super.update(elapsed);
	}

	private function updateCurStep():Void
	{
		var lastChange:BPMChangeEvent = {
			stepTime: 0,
			songTime: 0,
			bpm: 0
		}
		for (i in 0...Conductor.bpmChangeMap.length)
		{
			if (Conductor.songPosition > Conductor.bpmChangeMap[i].songTime)
				lastChange = Conductor.bpmChangeMap[i];
		}

		curStep = lastChange.stepTime + Math.floor(((Conductor.songPosition - Conductor.audioOffset) - lastChange.songTime) / Conductor.stepCrochet);
	}

	public function stepHit():Bool
	{
		var event = new SongTimeScriptEvent(ScriptEvent.SONG_STEP_HIT, curBeat, curStep);

		dispatchEvent(event);

		if (event.eventCanceled)
			return false;

		if (curStep % 4 == 0)
			beatHit();

		return true;
	}

	function dispatchEvent(event:ScriptEvent)
	{
		ModuleHandler.callEvent(event);
	}

	/**
	 * Close this substate and replace it with a different one.
	 */
	public function switchSubState(substate:FlxSubState):Void
	{
		this.close();
		this._parentState.openSubState(substate);
	}

	public function beatHit():Bool
	{
		var event = new SongTimeScriptEvent(ScriptEvent.SONG_BEAT_HIT, curBeat, curStep);

		dispatchEvent(event);

		if (event.eventCanceled)
			return false;

		return true;
	}
}