// JavaScript Document

/****************************************************
* Cross Browser Snake game- By Brady Mulhollem- http://www.webtech101.com
*This game is available at http://www.dynamicdrive.com
****************************************************/
			function cbsnake(){
			
				//Pixels to move at once
				this.jump = 8;
				//Size of snake. Make this one less than jump. Doesn't have to be,but adds good effect
				this.sos = 7;
				//Size of board
				//DANGER!!! this.sofb must be EVENLY dividable by this.jump DANGER!!!!
				this.sofb = 400;
				//Set things up
				this.daway = this.sofb - this.jump;
				this.correct = new Array();
				this.correct[0] = 0;
				while(this.correct[this.correct.length -1] != this.daway){
					this.correct[this.correct.length] = this.correct[this.correct.length -1]+this.jump
				}
				this.zero = 0;
				var gameboard = ' <div class="board" id="board"> <div id="i2"> This is a simple game of Snake. Select a speed then use your arrow keys to attempt and eat the apple(red block), but watch out for the walls and yourself. At any time you can pause the game by pressing the space bar.</div> </div><div class="board" id="score"> <span id="cscore">0</span> <span id="buttons"> <button type="button" id="slow" onClick="snake.slow()">Slow</button> <button type="button" id="medium"  onClick="snake.medium()">Medium</button> <button type="button" id="fast"  onClick="snake.fast()">Fast</button> </span></div>';
				document.write(gameboard);
			}
			
				cbsnake.prototype.setup = function(setspeed){
					var thisObj = this;
					//Score...
					this.score = 0;
					//Snake Direction
					this.sdir = 'none';
					this.sdirb = 'none'; 
					this.sdirp = 'none';
					//Snake arrays
					this.ctop = new Array();
					this.cleft = new Array();
					//Top of snake class
					this.ctop[0] = 200;
					this.ctop[1] = -8;
					//Left of Snake class
					this.cleft[0] = 200;
					this.cleft[1] = -8;
					//current top of apple
					this.atop = 0;
					//current left of apple
					this.aleft = 0;
					//Milliseconds between move
					this.speed = setspeed;
					document.getElementById('board').innerHTML = '<div id="apple"></div><div id="snake0" class="snake"></div><div id="snake1" class="snake"></div>';
					this.moveapple();
					this.stopgame = false;
					setTimeout(function(){ thisObj.msnake() },this.speed);
					document.onkeydown = function(e){ return thisObj.snakedir(e); };
				}
				cbsnake.prototype.slow = function(){
					this.setup(100);
					this.buttons('true');
					document.getElementById('slow').blur();
				}
				cbsnake.prototype.medium = function(){
					this.setup(70);
					this.buttons('true');
					document.getElementById('medium').blur();
				}
				cbsnake.prototype.fast = function(){
					this.setup(30);
					this.buttons('true');
					document.getElementById('fast').blur();
				}
				cbsnake.prototype.rannum = function(num1,num2){
					num1 = parseInt(num1);
					num2 = parseInt(num2);
					var generator = Math.random()*(Math.abs(num2-num1));
					generator = Math.round(num1+generator);
					return generator;
				}
				cbsnake.prototype.moveapple = function(){
					var usethis = false;
					while(!usethis){
						this.atop = this.correct[this.rannum(0,this.correct.length-1)];
						this.aleft = this.correct[this.rannum(0,this.correct.length-1)];
						if(this.numInArray(this.ctop,this.cleft,this.atop,this.aleft) == 0){
							usethis = true;
						}			
					}
					document.getElementById('apple').style.top = this.atop+"px";
					document.getElementById('apple').style.left = this.aleft+"px";
				}
				cbsnake.prototype.snakedir = function(e){  
						if(!e){
							//IE...
							e = window.event;
						}
						switch(e.keyCode){
							case 38:
								if(this.sdir != 'down' && this.sdirp != 'down'){
									this.sdirb = 'up';
									this.sdirp = 'up';
								}
								break;
							case 40:
								if(this.sdir != 'up' && this.sdirp != 'up'){
								this.sdirb = 'down';
								this.sdirp = 'down';
								}
								break;
							case 37:
								if(this.sdir != 'right' && this.sdirp != 'right'){
								this.sdirb = 'left';
								this.sdirp = 'left';
								}
								break;
							case 39:
								if(this.sdir != 'left' && this.sdirp != 'left'){
								this.sdirb = 'right';
								this.sdirp = 'right';
								}
								break;
							case 32:
								if(this.sdir == 'none' && this.sdirp != 'none'){
									this.sdirb = this.sdirp;
									this.sdirp = 'none';
								}
								else{
								this.sdirp = this.sdir;
								this.sdirb = 'none';
								}
								break;
						}
						return this.stopgame;
						
				}
				cbsnake.prototype.msnake = function(){
					if(this.stopgame === false){
						if(this.sdir != 'none'){
							this.moveall();
						}
						var thisObj = this;
						switch(this.sdir){
								case 'up':
									this.ctop[0] = this.ctop[0] - this.jump;
									document.getElementById('snake0').style.top = this.ctop[0]+"px";
									if((this.ctop[0] == this.zero && this.sdirb == 'up') || this.ctop[0] < this.zero){
										this.gover();
									}
									break;
								case 'down':
									this.ctop[0] = this.ctop[0] + this.jump;
									document.getElementById('snake0').style.top = this.ctop[0]+"px";
									if((this.ctop[0] == this.daway && this.sdirb == 'down') || this.ctop[0] > this.daway){
										this.gover();
									}
									break;
								case 'left':
									this.cleft[0] = this.cleft[0] - this.jump;
									document.getElementById('snake0').style.left = this.cleft[0]+"px";
									if((this.cleft[0] == this.zero && this.sdirb == 'left') || this.cleft[0] < this.zero){
										this.gover();
									}
									break;
								case 'right':
									this.cleft[0] = this.cleft[0] + this.jump;
									document.getElementById('snake0').style.left = this.cleft[0]+"px";
									if((this.cleft[0] == this.daway && this.sdirb == 'right') || this.cleft[0] > this.daway){
										this.gover();
									}
									break;
						}
						if(this.sdir != 'none'){
							this.hitself();
							this.happle();
						}
					this.sdir = this.sdirb
					setTimeout(function(){ thisObj.msnake() },this.speed);
					}
				}
				cbsnake.prototype.gover = function(){
					if(!this.stopgame){
						this.stopgame = true;
						var inner = document.getElementById('board').innerHTML;
						document.getElementById('board').innerHTML = inner+'<div id="notice">Game Over! Your Score was '+this.score+'</div><div id="i2">This is a simple game of Snake. Select a speed then use your arrow keys to attempt and eat the apple(red block), but watch out for the walls and yourself. At any time you can pause the game by pressing the space bar.';
						document.getElementById('apple').style.backgroundColor = '#D7BEBE';
						for(i=0;i<this.cleft.length;i++){
							document.getElementById('snake'+i).style.backgroundColor = '#BEBEBE';
						}
						this.buttons('');
					}
				}
				cbsnake.prototype.happle = function(){
					if(this.atop == this.ctop[0] && this.aleft == this.cleft[0]){
						//HIT!!!
						this.score++;
						document.getElementById('cscore').innerHTML = this.score;
						this.moveapple();
						this.addsnake();
					}
				}
				cbsnake.prototype.addsnake = function(){
				var newsnake = document.createElement('div');
				var newid = 'snake'+this.cleft.length;
				newsnake.setAttribute('id',newid);
				//this crap is for IE. I would rather add the class name.
				newsnake.style.position = 'absolute';
				newsnake.style.top = '-10px';
				newsnake.style.left = '-10px';
				newsnake.style.display = 'none';
				newsnake.style.backgroundColor = 'black';
				newsnake.style.height = '7px';
				newsnake.style.width = '7px';
				newsnake.style.overflow = 'hidden';
				document.getElementById('board').appendChild(newsnake);
				this.cleft[this.cleft.length] = -10;
				this.ctop[this.ctop.length] = -10;
				}
				cbsnake.prototype.moveall = function(){
					var i = this.ctop.length - 1;
					while(i != 0){
						document.getElementById('snake'+i).style.top = document.getElementById('snake'+(i-1)).style.top;
						document.getElementById('snake'+i).style.left = document.getElementById('snake'+(i-1)).style.left;
						document.getElementById('snake'+i).style.display = 'block';
						this.ctop[i] = this.ctop[i-1];
						this.cleft[i] = this.cleft[i-1];
						i = i - 1;
					}
				}
				cbsnake.prototype.numInArray = function(array,array2,value,value2){
					var n = 0;
					for (var i=0; i < array.length; i++) {
						if (array[i] === value && array2[i] === value2) {
							n++;
						}
					}
					return n;
				}
				cbsnake.prototype.hitself = function(){
					if(this.numInArray(this.ctop,this.cleft,this.ctop[0],this.cleft[0]) > 1){
						this.gover();
					}
				}
				cbsnake.prototype.buttons = function(setto){
					document.getElementById('slow').disabled = setto;
					document.getElementById('medium').disabled = setto;
					document.getElementById('fast').disabled = setto;
				}