/////////////////////////////////////////
//
// Mouse
//
var Mouse = function (screen, size) {
	this.Screen = screen;
	this.Size = size || {
		X: screen.width,
		Y: screen.height
	};

	this.Down = false;
	this.StartPosition = {
		X: 0,
		Y: 0
	};
	this.EndPosition = {
		X: 0,
		Y: 0
	};

	this.Screen.addEventListener("mousedown", this.OnMouseDown.bind(this), false);
	this.Screen.addEventListener("mousemove", this.OnMouseMove.bind(this), false);
	this.Screen.addEventListener("mouseup", this.OnMouseUp.bind(this), false);
	this.Screen.addEventListener("mouseleave", this.OnMouseLeave.bind(this),
		false);
	this.Screen.addEventListener("touchstart", this.OnTouchStart.bind(this),
		false);
	this.Screen.addEventListener("touchmove", this.OnTouchMove.bind(this), false);
	this.Screen.addEventListener("touchend", this.OnTouchEnd.bind(this), false);
	this.Screen.addEventListener("touchcancel", this.OnTouchEnd.bind(this), false);
};
Mouse.prototype = {
	GetEventPoistion: function (positionEvent) {
		var position = {
			X: positionEvent.X,
			Y: positionEvent.Y
		};
		var element = this.Screen;
		while (element) {
			position.X -= element.offsetLeft;
			position.Y -= element.offsetTop;
			element = element.offsetParent;
		}
		position.X = (position.X / this.Screen.offsetWidth) * this.Size.X;
		position.Y = (position.Y / this.Screen.offsetHeight) * this.Size.Y;
		return position;
	},
	OnMouseDown: function (event) {
		var position = this.GetEventPoistion({
			X: event.clientX,
			Y: event.clientY
		});
		this.RealDown = true;
		this.Down = true;
		this.StartPosition.X = position.X;
		this.StartPosition.Y = position.Y;
		this.EndPosition.X = position.X;
		this.EndPosition.Y = position.Y;
	},
	OnMouseMove: function (event) {
		if (this.RealDown === false) {
			return;
		}
		var position = this.GetEventPoistion({
			X: event.clientX,
			Y: event.clientY
		});
		this.RealDown = true;
		this.Down = true;
		this.EndPosition.X = position.X;
		this.EndPosition.Y = position.Y;
	},
	OnMouseUp: function (event) {
		var position = this.GetEventPoistion({
			X: event.clientX,
			Y: event.clientY
		});
		this.RealDown = false;
		this.EndPosition.X = position.X;
		this.EndPosition.Y = position.Y;
	},
	OnMouseLeave: function () {
		this.RealDown = false;
		this.Down = false;
	},
	OnTouchStart: function (event) {
		var position = this.GetEventPoistion({
			X: event.touches[0].clientX,
			Y: event.touches[0].clientY
		});
		this.RealDown = true;
		this.Down = true;
		this.StartPosition.X = position.X;
		this.StartPosition.Y = position.Y;
		this.EndPosition.X = position.X;
		this.EndPosition.Y = position.Y;
	},
	OnTouchMove: function (event) {
		if (this.RealDown === false) {
			return;
		}
		var position = this.GetEventPoistion({
			X: event.touches[0].clientX,
			Y: event.touches[0].clientY
		});
		this.RealDown = true;
		this.Down = true;
		this.EndPosition.X = position.X;
		this.EndPosition.Y = position.Y;
	},
	OnTouchEnd: function () {
		this.RealDown = false;
	},
	Update: function () {
		if (this.RealDown === false) {
			this.Down = false;
		}
	},
	Cancel: function () {
		this.RealDown = false;
		this.Down = false;
	},
	Debug: false
};


/////////////////////////////////////////
//
// Vec2D
//
var Vec2D = {
	Scale: function (vecIn, scale) {
		return {
			X: vecIn.X * scale,
			Y: vecIn.Y * scale
		};
	},
	Normalize: function (vecIn) {
		var len =
			Math.sqrt(
				(vecIn.X * vecIn.X) +
				(vecIn.Y * vecIn.Y));
		return {
			X: vecIn.X / len,
			Y: vecIn.Y / len
		};
	}
};


/////////////////////////////////////////
//
// GameScreen
//
var GameScreen = function (idScreen, funcInit, funcProc, funcEnd, tps) {
	this.Screen = document.getElementById(idScreen);
	this.Ctx = this.Screen.getContext('2d');
	this.Size = {
		X: this.Screen.width,
		Y: this.Screen.height
	};
	this.Entities = [];
	this.NewEntities = [];
	this.Running = false;
	this.FuncInit = funcInit;
	this.FuncProc = funcProc;
	this.FuncEnd = funcEnd;
	this.TPS = tps || 10;

	this.TickTime = 1000 / this.TPS;
	this.AccTickTime = this.TickTime;
	this.PreviousTime = 0;

	this.Mouse = new Mouse(this.Screen, this.Size);

	var self = this;
	this.Tick = function () {
		while (self.AccTickTime >= self.TickTime) {
			self.Update();
			if (self.FuncProc) {
				self.FuncProc(self);
			}
			self.Mouse.Update();
			self.CleanDead();
			self.InsertAdded();
			self.AccTickTime -= self.TickTime;
		}
		self.Draw(self.AccTickTime / self.TickTime);

		var timeNow = performance.now();
		self.AccTickTime += timeNow - self.PreviousTime;
		self.PreviousTime = timeNow;

		if (self.Running) {
			window.requestAnimationFrame(self.Tick);
		} else {
			if (self.FuncEnd) {
				self.FuncEnd(self);
			}
		}
	};
};
GameScreen.prototype = {
	// For internal use
	CleanDead: function () {
		var i = this.Entities.length - 1;
		while (i > 0) {
			if (this.Entities[i].GameEntity.Deleted) {
				this.Entities.splice(i, 1);
			}
			i--;
		}
	},
	InsertAdded: function () {
		var i;
		for (i = 0, n = this.NewEntities.length; i < n; i++) {
			this.Entities.push(this.NewEntities[i]);
		}
		this.NewEntities = [];
	},
	Update: function () {
		for (var i = 0, n = this.Entities.length; i < n; i++) {
			var entity = this.Entities[i];
			if (entity.GameEntity.Deleted) {
				continue;
			}
			entity.GameEntity.Update();
			if (entity.Update) {
				entity.Update();
			}
		}
	},
	Draw: function (factor) {
		this.Ctx.clearRect(0, 0, this.Size.X, this.Size.Y);
		for (var i = 0, n = this.Entities.length; i < n; i++) {
			var entity = this.Entities[i];
			if (entity.GameEntity.Deleted) {
				continue;
			}
			entity.GameEntity.Draw(factor);
		}
	},

	// For public use
	Start: function () {
		if (this.Running === false && this.FuncInit) {
			this.FuncInit(this);
		}
		this.Running = true;

		this.PreviousTime = performance.now();
		this.Tick();
	},
	Stop: function () {
		this.Running = false;
	},
	AddEntity: function (newEntity) {
		this.NewEntities.push(newEntity);
	},
	GetEntitiesUnderPoint: function (point, type) {
		var entities = [];
		for (var i = 0, n = this.Entities.length; i < n; i++) {
			var entity = this.Entities[i];
			if (entity.GameEntity.Deleted) {
				continue;
			}
			if (type) {
				if (entity.GameEntity.Type !== type) {
					continue;
				}
			}
			if (entity.GameEntity.IntersectPoint(point)) {
				entities.push(entity);
			}
		}
		return entities;
	},
	Debug: false
};


/////////////////////////////////////////
//
// GameEntity
//
var GameEntity = function (gameScreen, position, size, image, type) {
	this.GameScreen = gameScreen;
	if (position) {
		this.Position = {
			X: position.X,
			Y: position.Y
		};
		this.PositionDest = {
			X: position.X,
			Y: position.Y
		};
	} else {
		this.Position = {
			X: 0,
			Y: 0
		};
		this.PositionDest = {
			X: 0,
			Y: 0
		};
	}
	this.Size = size || {
		X: 0,
		Y: 0
	};
	this.Type = type || "Undefined";
	this.Image = image;
	this.Deleted = false;
};
GameEntity.prototype = {
	Update: function () {
		this.Position.X = this.PositionDest.X;
		this.Position.Y = this.PositionDest.Y;
	},
	Draw: function (factor) {
		if (!this.Image) {
			return;
		}
		var x = this.Position.X - factor * (this.Position.X - this.PositionDest.X);
		var y = this.Position.Y - factor * (this.Position.Y - this.PositionDest.Y);
		this.GameScreen.Ctx.drawImage(this.Image,
			x - (this.Size.X / 2),
			y - (this.Size.Y / 2));
	},
	SetImage: function (image) {
		this.Image = image;
	},
	SetPosition: function (position) {
		this.Position.X = position.X;
		this.Position.Y = position.Y;
		this.PositionDest.X = position.X;
		this.PositionDest.Y = position.Y;
	},
	UpdatePosition: function (position) {
		this.Position.X = this.PositionDest.X;
		this.Position.Y = this.PositionDest.Y;
		this.PositionDest.X = position.X;
		this.PositionDest.Y = position.Y;
	},
	AddPosition: function (delta) {
		this.PositionDest.X = this.Position.X + delta.X;
		this.PositionDest.Y = this.Position.Y + delta.Y;
	},
	Delete: function () {
		this.Deleted = true;
	},
	IntersectPoint: function (point) {
		return (
			point.X < (this.PositionDest.X + (this.Size.X / 2)) &&
			point.X > (this.PositionDest.X - (this.Size.X / 2)) &&
			point.Y < (this.PositionDest.Y + (this.Size.Y / 2)) &&
			point.Y > (this.PositionDest.Y - (this.Size.Y / 2)) &&
			true);
	},
	InsideScreen: function () {
		return (
			(this.Position.X + (this.Size.X / 2)) > 0 &&
			(this.Position.Y + (this.Size.Y / 2)) > 0 &&
			(this.Position.X - (this.Size.X / 2)) < this.GameScreen.Size.X &&
			(this.Position.Y - (this.Size.Y / 2)) < this.GameScreen.Size.Y);
	},
	Debug: false
};


/////////////////////////////////////////
//
// ImageLoader
//
var ImageLoader = function () {
	this.Images = {};
};
ImageLoader.prototype = {
	IsImageOk: function (img) {
		if (!img.complete) {
			return false;
		}
		if (typeof img.naturalWidth !== "undefined" && img.naturalWidth === 0) {
			return false;
		}
		return true;
	},
	LoadImages: function (imageList, funcOnLoad) {
		this.ImageCount = imageList.length;
		this.FuncOnLoad = funcOnLoad;
		var imageName;

		var i,
			n;
		for (i = 0, n = imageList.length; i < n; i++) {
			imageName = imageList[i].Name;
			this.Images[imageName] = new Image();
		}

		var self = this;
		var launched = false;
		var privateOnLoad = function () {
			if (launched) {
				return;
			}
			var count = 0;
			for (var name in self.Images) {
				if (self.Images.hasOwnProperty(name)) {
					if (self.IsImageOk(self.Images[name])) {
						count++;
					}
				}
			}

			console.log("Images: " + count + "/" + self.ImageCount);
			if (count == self.ImageCount) {
				launched = true;
				if (self.FuncOnLoad) {
					self.FuncOnLoad();
				}
			}
		};
		for (i = 0, n = imageList.length; i < n; i++) {
			imageName = imageList[i].Name;
			this.Images[imageName].onload = privateOnLoad;
			this.Images[imageName].src = imageList[i].Url;
		}
		privateOnLoad();
	},
	GetImage: function (name) {
		return this.Images[name];
	},
	Debug: false
};

/////////////////////////////////////////
//
// SoundLoader
//
var SoundLoader = function () {
	this.Sounds = {};
	this.Limits = {};
};
SoundLoader.prototype = {
	LoadSounds: function (soundsList, funcOnLoad) {
		this.SoundsCount = soundsList.length;
		this.FuncOnLoad = funcOnLoad;

		var soundName;

		var i, n;
		for (i = 0, n = soundsList.length; i < n; i++) {
			soundName = soundsList[i].Name;
			this.Sounds[soundName] = new Audio();
			if (soundsList[i].Limit) {
				this.Limits[soundName] = {
					Max: soundsList[i].Limit,
					Count: 0
				};
			}
		}

		var self = this;
		var launched = false;
		var privateOnLoad = function () {
			if (launched) {
				return;
			}
			var count = 0;
			for (var name in self.Sounds) {
				if (self.Sounds.hasOwnProperty(name)) {
					if (self.Sounds[name].readyState) {
						count++;
					}
				}
			}

			console.log("Sounds: " + count + "/" + self.SoundsCount);
			if (count == self.SoundsCount) {
				launched = true;
				if (self.FuncOnLoad) {
					self.FuncOnLoad();
				}
			}
		};
		for (i = 0, n = soundsList.length; i < n; i++) {
			soundName = soundsList[i].Name;
			this.Sounds[soundName].onloadeddata = privateOnLoad;
			this.Sounds[soundName].src = soundsList[i].Url;
		}
		privateOnLoad();
	},
	PlaySound: function (name) {
		if (this.Limits[name]) {
			if (this.Limits[name].Max <= this.Limits[name].Count){
				return;
			}
			this.Limits[name].Count++;
		}
		var sndOrig = this.Sounds[name];
		var sndCopy = sndOrig.cloneNode();
		sndCopy.play();
	},
	ResetCounters: function () {
		for (var name in this.Limits) {
			if (this.Limits.hasOwnProperty(name)) {
				this.Limits[name].Count = 0;
			}
		}
	},
	Debug: false
};