package funkin.game;

import flixel.math.FlxPoint;
import flixel.sound.FlxSound;
import flixel.tweens.FlxTween;
import flixel.util.FlxSignal.FlxTypedSignal;
import funkin.backend.chart.ChartData;
import funkin.backend.scripting.events.note.*;
import funkin.backend.system.Conductor;
import funkin.backend.system.Controls;

/**
 * Group of strums, that contains the strums and notes.
 * Used in PlayState.
**/
class StrumLine extends FlxTypedGroup<Strum> {
	/**
	 * Signal that triggers whenever a note is hit. Similar to onPlayerHit and onDadHit, except strumline specific.
	 * To add a listener, do
	 * `strumLine.onHit.add(function(e:NoteHitEvent) {});`
	 */
	public var onHit:FlxTypedSignal<NoteHitEvent->Void> = new FlxTypedSignal<NoteHitEvent->Void>();
	/**
	 * Signal that triggers whenever a note is missed. Similar to onPlayerMiss, except strumline specific.
	 * To add a listener, do
	 * `strumLine.onMiss.add(function(e:NoteMissEvent) {});`
	 */
	public var onMiss:FlxTypedSignal<NoteMissEvent->Void> = new FlxTypedSignal<NoteMissEvent->Void>();
	/**
	 * Signal that triggers whenever a note is being updated. Similar to onNoteUpdate, except strumline specific.
	 * To add a listener, do
	 * `strumLine.onNoteUpdate.add(function(e:NoteUpdateEvent) {});`
	 */
	public var onNoteUpdate:FlxTypedSignal<NoteUpdateEvent->Void> = new FlxTypedSignal<NoteUpdateEvent->Void>();
	/**
	 * Signal that triggers whenever a note is being deleted. Similar to onNoteDelete, except strumline specific.
	 * To add a listener, do
	 * `strumLine.onNoteDelete.add(function(e:SimpleNoteEvent) {});`
	 */
	public var onNoteDelete:FlxTypedSignal<SimpleNoteEvent->Void> = new FlxTypedSignal<SimpleNoteEvent->Void>();
	/**
	 * Array containing all of the characters "attached" to those strums.
	 */
	public var characters:Array<Character>;
	/**
	 * Whenever this strumline is controlled by cpu or not.
	 */
	public var cpu(default, set):Bool = false;
	/**
	 * Whenever this strumline is from the opponent side or the player side.
	 */
	public var opponentSide:Bool = false;
	/**
	 * Controls assigned to this strumline.
	 */
	public var controls:Controls = null;
	/**
	 * Chart JSON data assigned to this StrumLine (Codename format)
	 */
	public var data:ChartStrumLine = null;
	/**
	 * Whenever Ghost Tapping is enabled.
	 */
	@:isVar public var ghostTapping(get, set):Null<Bool> = null;
	/**
	 * Group of all of the notes in this strumline. Using `forEach` on this group will only loop through the first notes for performance reasons.
	 */
	public var notes:NoteGroup;
	/**
	 * Whenever alt animation is enabled on this strumline.
	 */
	public var altAnim(get, set):Bool;
	/**
	 * Which animation suffix on characters that should be used when hitting notes.
	 */
	public var animSuffix(default, set):String = "";
	/**
	 * TODO: Write documentation about this being a variable that can help when making multi key
	 */
	public var strumAnimPrefix = ["left", "down", "up", "right"];
	/**
	 * Vocals sound (Vocals.ogg). Used for individual vocals per strumline.
	 */
	public var vocals:FlxSound;
	/**
	 * Extra data that can be added to the strum line.
	**/
	public var extra:Map<String, Dynamic> = [];

	private function get_ghostTapping() {
		if (this.ghostTapping != null) return this.ghostTapping;
		if (PlayState.instance != null) return PlayState.instance.ghostTapping;
		return false;
	}

	private inline function set_ghostTapping(b:Bool):Bool
		return this.ghostTapping = b;


	private var startingPos:FlxPoint = FlxPoint.get(0,0);
	/**
	 * The scale of the strums.
	 * If called after generate, the strums wont be scaled.
	 * You can only change it in the Charter.
	**/
	public var strumScale:Float = 1;

	public function new(characters:Array<Character>, startingPos:FlxPoint, strumScale:Float, cpu:Bool = false, opponentSide:Bool = true, ?controls:Controls, ?vocalPrefix:String = "") {
		super();
		this.characters = characters;
		this.startingPos = startingPos;
		this.strumScale = strumScale;
		this.cpu = cpu;
		this.opponentSide = opponentSide;
		this.controls = controls;
		this.notes = new NoteGroup();

		var v = Paths.voices(PlayState.SONG.meta.name, PlayState.difficulty, vocalPrefix);
		vocals = vocalPrefix != "" ? FlxG.sound.load(Options.streamedVocals ? Assets.getMusic(v) : v) : new FlxSound();
		vocals.persist = false;
	}

	/**
	 * Generates the notes for the strumline.
	**/
	public function generate(strumLine:ChartStrumLine, ?startTime:Float) {
		// TODO: implement double generate call support if needed

		var total = 0;
		if (strumLine.notes != null) for(note in strumLine.notes) {
			if (startTime != null && startTime > note.time)
				continue;

			total++;

			if (note.sLen > Conductor.stepCrochet * 0.75) {
				var len:Float = note.sLen;
				while(len > 10) {
					total++;
					len -= Math.min(len, Conductor.stepCrochet);
				}
			}
		}

		notes.preallocate(total);

		var il = 0;

		var prev:Note = null;

		if (strumLine.notes != null) for(note in strumLine.notes) {
			if (startTime != null && startTime > note.time)
				continue;

			notes.members[total-(il++)-1] = prev = new Note(this, note, false, prev);

			if (note.sLen > Conductor.stepCrochet * 0.75) {
				var len:Float = note.sLen;
				var curLen:Float = 0;
				while(len > 10) {
					curLen = Math.min(len, Conductor.stepCrochet);
					notes.members[total-(il++)-1] = prev = new Note(this, note, true, curLen, note.sLen - len, prev);
					len -= curLen;

					if (prev != null && prev.sustainParent != null)
						prev.sustainParent.tailCount++;
				}
			}
		}
		notes.sortNotes();

		var scrollSpeed = strumLine.scrollSpeed;
		if(scrollSpeed == null) if (PlayState.instance != null) scrollSpeed = PlayState.instance.scrollSpeed;
		if(scrollSpeed == null) scrollSpeed = 1;

		// TODO: Make this work by accounting zoom and scroll speed changes  - Nex
		/*var limit = FlxG.height / 0.45;
		notes.limit = limit / scrollSpeed;
			OR
		notes.limit = Flags.DEFAULT_NOTE_MS_LIMIT / scrollSpeed;*/
	}

	public override function update(elapsed:Float) {
		super.update(elapsed);
		notes.update(elapsed);
	}

	public override function draw() {
		super.draw();
		notes.cameras = cameras;
		notes.draw();
	}

	/**
	 * Updates the notes.
	**/
	public inline function updateNotes() {
		__updateNote_songPos = Conductor.songPosition;
		if(__updateNote_event == null) __updateNote_event = PlayState.instance.__updateNote_event;
		notes.forEach(updateNote);
	}

	var __updateNote_strum:Strum;
	var __updateNote_songPos:Float;
	var __updateNote_event:NoteUpdateEvent;
	/**
	 * Updates a note.
	 * This updates the position, state, and handles the input.
	**/
	public function updateNote(daNote:Note) {
		__updateNote_strum = members[daNote.noteData];
		if (__updateNote_strum == null) return;

		__updateNote_event.recycle(daNote, FlxG.elapsed, __updateNote_strum);
		onNoteUpdate.dispatch(__updateNote_event);
		if (__updateNote_event.cancelled) return;

		if (__updateNote_event.__updateHitWindow) {
			var hitWindow = Flags.USE_LEGACY_TIMING ? PlayState.instance.hitWindow : PlayState.instance.ratingManager.lastHitWindow;
			daNote.canBeHit = (daNote.strumTime > __updateNote_songPos - (hitWindow * daNote.latePressWindow)
				&& daNote.strumTime < __updateNote_songPos + (hitWindow * daNote.earlyPressWindow));

			if (daNote.strumTime < __updateNote_songPos - hitWindow && !daNote.wasGoodHit)
				daNote.tooLate = true;
		}

		if (cpu && __updateNote_event.__autoCPUHit && !daNote.avoid && !daNote.wasGoodHit && daNote.strumTime < __updateNote_songPos)
			PlayState.instance.goodNoteHit(this, daNote);

		if (daNote.wasGoodHit && daNote.isSustainNote && daNote.strumTime + daNote.sustainLength < __updateNote_songPos && !daNote.noSustainClip) {
			deleteNote(daNote);
			return;
		}

		if (daNote.tooLate) {
			if (!cpu) PlayState.instance.noteMiss(this, daNote);
			else deleteNote(daNote);
			return;
		}


		if (__updateNote_event.strum == null) return;
		if (__updateNote_event.__reposNote) __updateNote_event.strum.updateNotePosition(daNote);

		if (daNote.isSustainNote) {
			daNote.updateSustain(__updateNote_event.strum);
		}
	}

	var __pressed:Array<Bool> = [];
	var __justPressed:Array<Bool> = [];
	var __justReleased:Array<Bool> = [];
	var __notePerStrum:Array<Note> = [];

	function __inputProcessPressed(note:Note) {
		if (__pressed[note.strumID] && note.isSustainNote && note.strumTime < __updateNote_songPos && !note.wasGoodHit && note.sustainParent.wasGoodHit) {
			PlayState.instance.goodNoteHit(this, note);
		}
	}
	function __inputProcessJustPressed(note:Note) {
		if (__justPressed[note.strumID] && !note.isSustainNote && !note.wasGoodHit && note.canBeHit) {
			var cur = __notePerStrum[note.strumID];
			var songPos = __updateNote_songPos;

			var noteDist = Math.abs(note.strumTime - songPos);
			var curDist = cur != null ? Math.abs(cur.strumTime - songPos) : 999999;

			var notePenalty = note.avoid ? 1 : 0;
			var curPenalty = (cur != null && cur.avoid) ? 1 : 0;

			if (cur == null
				|| notePenalty < curPenalty
				|| (notePenalty == curPenalty && noteDist < curDist))
				__notePerStrum[note.strumID] = note;
		}
	}

	/**
	 * Updates the input for the strumline, and handles the input.
	 * @param id The ID of the strum
	**/
	public function updateInput(id:Int = 0) {
		updateNotes();

		if (cpu) return;

		if (__pressed.length != members.length) {
			__pressed.resize(members.length);
			__justPressed.resize(members.length);
			__justReleased.resize(members.length);
		}

		for (i in 0...members.length) {
			__pressed[i] = members[i].__getPressed(this);
			__justPressed[i] = members[i].__getJustPressed(this);
			__justReleased[i] = members[i].__getJustReleased(this);
		}

		var event = EventManager.get(InputSystemEvent).recycle(__pressed, __justPressed, __justReleased, this, id);
		if (PlayState.instance != null) PlayState.instance.gameAndCharsEvent("onInputUpdate", event);
		if (event.cancelled) return;

		__pressed = CoolUtil.getDefault(event.pressed, []);
		__justPressed = CoolUtil.getDefault(event.justPressed, []);
		__justReleased = CoolUtil.getDefault(event.justReleased, []);

		__notePerStrum = cast new haxe.ds.Vector(members.length); // [for(_ in 0...members.length) null];

		if (__pressed.contains(true)) {
			if (__justPressed.contains(true)) {
				notes.forEachAlive(__inputProcessJustPressed);

				if (!ghostTapping) for (k => pr in __justPressed) if (pr && __notePerStrum[k] == null)
					PlayState.instance.noteMiss(this, null, k, ID); // FUCK YOU

				for (e in __notePerStrum)
					if (e != null)
						PlayState.instance.goodNoteHit(this, e);
			}

			for (c in characters)
				if (c.lastAnimContext != DANCE)
					c.__lockAnimThisFrame = true;

			notes.forEachAlive(__inputProcessPressed);
		}

		forEach(function(str:Strum) {
			str.updatePlayerInput(__pressed[str.ID], __justPressed[str.ID], __justReleased[str.ID]);
		});

		PlayState.instance.gameAndCharsCall("onPostInputUpdate");
	}

	/**
	 * Adds/removes health to/from the strumline.
	 * If the strumline is an opponent strumline, it will subtract the health, otherwise it will add the health.
	 * @param health The amount of health to add/remove
	**/
	public inline function addHealth(health:Float)
		PlayState.instance.health += health * (opponentSide ? -1 : 1);

	/**
	 * Generates strums, and adds them to the strumline.
	 * @param amount The amount of strums to generate (-1 for the default amount)
	**/
	public inline function generateStrums(amount:Int = -1) {
		if(amount == -1) amount = Flags.DEFAULT_STRUM_AMOUNT;
		for (i in 0...amount)
			add(createStrum(i));
	}

	override function destroy() {
		super.destroy();
		if(startingPos != null)
			startingPos.put();
		notes = FlxDestroyUtil.destroy(notes);
	}

	/**
	 * Creates a strum and returns the created strum (needs to be added manually).
	 * @param i Index of the strum
	 * @param animPrefix (Optional) Animation prefix (`left` = `arrowLEFT`, `left press`, `left confirm`).
	 * @param spritePath (Optional) The sprite's graphic path if you don't want the default one.
	 * @param playIntroAnimation (Optional) Whenever the intro animation should be played, by default might be `true` under certain conditions.
	 */
	public function createStrum(i:Int, ?animPrefix:String, ?spritePath:String, ?playIntroAnimation:Bool) {
		if (animPrefix == null)
			animPrefix = strumAnimPrefix[i % strumAnimPrefix.length];
		var babyArrow:Strum = new Strum(startingPos.x + (Note.swagWidth * strumScale * (data.strumSpacing != null ? data.strumSpacing : 1) * i), startingPos.y + (Note.swagWidth*0.5) - (Note.swagWidth * strumScale * 0.5));
		babyArrow.ID = i;
		babyArrow.strumLine = this;

		if(data.scrollSpeed != null)
			babyArrow.scrollSpeed = data.scrollSpeed;

		var event = EventManager.get(StrumCreationEvent).recycle(babyArrow, PlayState.instance.strumLines.members.indexOf(this), i, animPrefix);
		event.__doAnimation = playIntroAnimation == null ? (!MusicBeatState.skipTransIn && (PlayState.instance != null ? PlayState.instance.introLength > 0 : true)) : playIntroAnimation;
		if (spritePath != null) event.sprite = spritePath;
		if (PlayState.instance != null) event = PlayState.instance.gameAndCharsEvent("onStrumCreation", event);

		if (!event.cancelled) {
			babyArrow.frames = Paths.getFrames(event.sprite);
			babyArrow.animation.addByPrefix('green', 'arrowUP');
			babyArrow.animation.addByPrefix('blue', 'arrowDOWN');
			babyArrow.animation.addByPrefix('purple', 'arrowLEFT');
			babyArrow.animation.addByPrefix('red', 'arrowRIGHT');

			babyArrow.antialiasing = true;
			babyArrow.setGraphicSize(Std.int((babyArrow.width * Flags.DEFAULT_NOTE_SCALE) * strumScale));

			babyArrow.animation.addByPrefix('static', 'arrow${event.animPrefix.toUpperCase()}');
			babyArrow.animation.addByPrefix('pressed', '${event.animPrefix} press', 24, false);
			babyArrow.animation.addByPrefix('confirm', '${event.animPrefix} confirm', 24, false);
		}

		babyArrow.cpu = cpu;
		babyArrow.updateHitbox();
		babyArrow.scrollFactor.set();

		if (event.__doAnimation)
		{
			babyArrow.y -= 10;
			babyArrow.alpha = 0;
			FlxTween.tween(babyArrow, {y: babyArrow.y + 10, alpha: 1}, 1, {ease: FlxEase.circOut, startDelay: 0.5 + (0.2 * i * (4 / (data.keyCount != null ? data.keyCount : 4)))});
		}
		babyArrow.playAnim('static');

		insert(i, babyArrow);

		if (PlayState.instance != null) PlayState.instance.gameAndCharsEvent("onPostStrumCreation", event);

		return babyArrow;
	}

	/**
	 * Deletes a note from this strumline.
	 * @param note Note to delete
	 */
	public function deleteNote(note:Note) {
		if (note == null) return;
		var event:SimpleNoteEvent = EventManager.get(SimpleNoteEvent).recycle(note);
		onNoteDelete.dispatch(event);
		if (!event.cancelled) {
			if (note.isSustainNote && note.sustainParent != null && note.sustainParent.tailCount > 0)
				note.sustainParent.tailCount--;
			note.kill();
			notes.remove(note, true);
			note.destroy();
		}
	}

	public static inline function calculateStartingXPos(hudXRatio:Float, scale:Float, spacing:Float, keyCount:Int) {
		return (FlxG.width * hudXRatio) - ((Note.swagWidth * scale * ((keyCount/2)-0.5) * spacing) + Note.swagWidth * 0.5 * scale);
	}

	/**
	 * SETTERS & GETTERS
	 */
	#if REGION
	private inline function set_cpu(b:Bool):Bool {
		for(s in members)
			if (s != null)
				s.cpu = b;
		return cpu = b;
	}
	private inline function set_animSuffix(str:String):String {
		for(s in members)
			if (s != null)
				s.animSuffix = str;
		return animSuffix = str;
	}
	private inline function set_altAnim(b:Bool):Bool {
		animSuffix = b ? "-alt" : "";
		return b;
	}
	private inline function get_altAnim():Bool {
		return animSuffix == "-alt";
	}
	#end
}