package;

import flixel.FlxG;
import flixel.FlxState;
import flixel.FlxSprite;
import flixel.graphics.frames.FlxAtlasFrames;
import flixel.util.FlxTimer;

import openfl.utils.Assets;
import lime.utils.Assets as LimeAssets;
import lime.utils.AssetBundle;
import lime.utils.AssetLibrary;
import lime.utils.AssetManifest;
import lime.app.Future;
import lime.app.Promise;

import haxe.io.Path;

class LoadingState extends MusicBeatState
{
	inline static var MIN_TIME = 1.0;
	
	var target:FlxState;
	var stopMusic = false;
	var callbacks:MultiCallback;
	
	var logo:FlxSprite;
	var gfDance:FlxSprite;
	var danceLeft = false;
	
	function new(target:FlxState, stopMusic:Bool)
	{
		super();
		this.target = target;
		this.stopMusic = stopMusic;
	}
	
	override function create()
	{
		logo = new FlxSprite(-150, -100);
		logo.frames = FlxAtlasFrames.fromSparrow('assets/images/logoBumpin.png', 'assets/images/logoBumpin.xml');
		logo.antialiasing = true;
		logo.animation.addByPrefix('bump', 'logo bumpin', 24);
		logo.animation.play('bump');
		logo.updateHitbox();
		// logoBl.screenCenter();
		// logoBl.color = FlxColor.BLACK;

		gfDance = new FlxSprite(FlxG.width * 0.4, FlxG.height * 0.07);
		gfDance.frames = FlxAtlasFrames.fromSparrow('assets/images/gfDanceTitle.png', 'assets/images/gfDanceTitle.xml');
		gfDance.animation.addByIndices('danceLeft', 'gfDance', [30, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14], "", 24, false);
		gfDance.animation.addByIndices('danceRight', 'gfDance', [15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29], "", 24, false);
		gfDance.antialiasing = true;
		add(gfDance);
		add(logo);
		
		// function onSongsManifestInit()
		// {
			callbacks = new MultiCallback(onLoad);
			var introComplete = callbacks.add("introComplete");
			checkLoadSong(getSongPath());
			checkLoadSong(getVocalPath());
			checkLibrary("shared");
			if (PlayState.storyWeek > 0)
				checkLibrary("week" + PlayState.storyWeek);
			else
				checkLibrary("tutorial");
			
			var fadeTime = 0.5;
			FlxG.camera.fade(FlxG.camera.bgColor, fadeTime, true);
			new FlxTimer().start(fadeTime + MIN_TIME, function(_) introComplete());
		// }
		
		// initSongsManifest(onSongsManifestInit);
	}
	
	function checkLoadSong(path:String)
	{
		if (!Assets.cache.hasSound(path))
		{
			var library = Assets.getLibrary("songs");
			final symbolPath = path.split(":").pop();
			@:privateAccess
			library.types.set(symbolPath, SOUND);
			@:privateAccess
			library.pathGroups.set(symbolPath, [library.__cacheBreak(symbolPath)]);
			var callback = callbacks.add("song:" + path);
			Assets.loadSound(path).onComplete(function (_) { callback(); });
		}
	}
	
	function checkLibrary(library:String)
	{
		if (Assets.getLibrary(library) == null)
		{
			var callback = callbacks.add("library:" + library);
			Assets.loadLibrary(library).onComplete(function (_) { callback(); });
		}
	}
	
	override function beatHit()
	{
		super.beatHit();
		
		logo.animation.play('bump');
		danceLeft = !danceLeft;
		
		if (danceLeft)
			gfDance.animation.play('danceRight');
		else
			gfDance.animation.play('danceLeft');
	}
	
	override function update(elapsed:Float)
	{
		super.update(elapsed);
	}
	
	function onLoad()
	{
		if (stopMusic && FlxG.sound.music != null)
			FlxG.sound.music.stop();
		
		FlxG.switchState(target);
	}
	
	static function getSongPath()
	{
		return Paths.inst(PlayState.SONG.song);
	}
	
	static function getVocalPath()
	{
		return Paths.voices(PlayState.SONG.song);
	}
	
	inline static public function loadAndSwitchState(target:FlxState, stopMusic = false)
	{
		FlxG.switchState(getNextState(target, stopMusic));
	}
	
	static function getNextState(target:FlxState, stopMusic = false):FlxState
	{
		#if js
		var loaded = isSoundLoaded(getSongPath())
			&& (!PlayState.SONG.needsVoices || isSoundLoaded(getVocalPath()))
			&& isLibraryLoaded("shared");
		
		if (!loaded)
			return new LoadingState(target, stopMusic);
		#end
		if (stopMusic && FlxG.sound.music != null)
			FlxG.sound.music.stop();
		
		return target;
	}
	
	#if js
	static function isSoundLoaded(path:String):Bool
	{
		return Assets.cache.hasSound(path);
	}
	
	static function isLibraryLoaded(library:String):Bool
	{
		return Assets.getLibrary(library) != null;
	}
	#end
	
	override function destroy()
	{
		super.destroy();
		
		callbacks = null;
	}
	
	
	/**
	 * creates the song manifest without loading all the songs so we can load them individually
	 * @param onComplete called on load
	 * @return Future<AssetLibrary>
	 */
	static function initSongsManifest(onComplete:Void->Void):Future<AssetLibrary>
	{
		final id = "songs";
		var promise = new Promise<AssetLibrary>();

		// #if (tools && !display && !macro)
		var library = LimeAssets.getLibrary(id);

		if (library != null)
		{
			onComplete();
			return Future.withValue(library);
		}
		
		var path = id;
		var rootPath = null;
		
		// @:privateAccess
		// if (LimeAssets.bundlePaths.exists(id))
		// {
		// 	AssetBundle.loadFromFile(bundlePaths.get(id)).onComplete(function(bundle)
		// 	{
		// 		if (bundle == null)
		// 		{
		// 			promise.error("Cannot load bundle for library \"" + id + "\"");
		// 			return;
		// 		}

		// 		var library = AssetLibrary.fromBundle(bundle);

		// 		if (library == null)
		// 		{
		// 			promise.error("Cannot open library \"" + id + "\"");
		// 		}
		// 		else
		// 		{
		// 			libraries.set(id, library);
		// 			library.onChange.add(LimeAssets.onChange.dispatch);
		// 			promise.completeWith(Future.withValue(library));
		// 			onComplete();
		// 		}
		// 	}).onError(function(_)
		// 	{
		// 		promise.error("There is no asset library with an ID of \"" + id + "\"");
		// 	});
		// }
		// else
		// {
			@:privateAccess
			final libraryPaths = LimeAssets.libraryPaths;
			if (libraryPaths.exists(id))
			{
				path = libraryPaths[id];
				rootPath = Path.directory(path);
			}
			else
			{
				if (StringTools.endsWith(path, ".bundle"))
				{
					rootPath = path;
					path += "/library.json";
				}
				else
				{
					rootPath = Path.directory(path);
				}
				@:privateAccess
				path = LimeAssets.__cacheBreak(path);
			}

			AssetManifest.loadFromFile(path, rootPath).onComplete(function(manifest)
			{
				if (manifest == null)
				{
					promise.error("Cannot parse asset manifest for library \"" + id + "\"");
					return;
				}

				var library = AssetLibrary.fromManifest(manifest);

				if (library == null)
				{
					promise.error("Cannot open library \"" + id + "\"");
				}
				else
				{
					@:privateAccess
					LimeAssets.libraries.set(id, library);
					library.onChange.add(LimeAssets.onChange.dispatch);
					promise.completeWith(Future.withValue(library));
					onComplete();
				}
			}).onError(function(_)
			{
				promise.error("There is no asset library with an ID of \"" + id + "\"");
			});
		// }
		// #end

		return promise.future;
	}
}

class MultiCallback
{
	public var callback:Void->Void;
	public var logId:String = null;
	public var length(default, null) = 0;
	public var numRemaining(default, null) = 0;
	
	var unfired = new Map<String, Void->Void>();
	var fired = new Array<String>();
	
	public function new (callback:Void->Void, logId:String = null)
	{
		this.callback = callback;
		this.logId = logId;
	}
	
	public function add(id = "untitled")
	{
		id = '$length:$id';
		length++;
		numRemaining++;
		var func:Void->Void = null;
		func = function ()
		{
			if (unfired.exists(id))
			{
				unfired.remove(id);
				fired.push(id);
				numRemaining--;
				
				if (logId != null)
					log('fired $id, $numRemaining remaining');
				
				if (numRemaining == 0)
				{
					if (logId != null)
						log('all callbacks fired');
					callback();
				}
			}
			else
				log('already fired $id');
		}
		unfired[id] = func;
		return func;
	}
	
	inline function log(msg):Void
	{
		if (logId != null)
			trace('$logId: $msg');
	}
	
	public function getFired() return fired.copy();
	public function getUnfired() return [for (id in unfired) id];
}