// the game itself
var game;

// global object with all game options
var gameOptions = {

     // game width
     gameWidth: 840,
     
     // height of each floor
     floorHeight: 20,
     
     // array with vertical floors potision
     floorY: [],
     
     // number of floors
     floorsAmount: 4,
     
     // number of spikes per floor
     spikesAmount: 4,
     
     // height of each spike
     spikeHeight: 40,
     
     // size of the hero
     squareSize: 16,
     
     // horizontal speed of the hero
     squareSpeed: 170,
     
     // game gravity
     squareGravity: 450,
     
     // force to be applied at each jump
     jumpForce: -210,
     
     // jump tween length, in milliseconds
     jumpTime: 300,
     
     // colors used in the game
     levelColors: [0xe81d62, 0x9b26af, 0x2095f2, 0x4bae4f, 0xfeea3a, 0x795548, 0x5f7c8a],
     
     // local storage name, it's the variable we will be using to save game information such as best score
     localStorageName: "justjumpgame",
     
     // just a string with version number to be displayed
     version: "1.1m"
}

// when the window loads
window.onload = function() {

     // determining window width/height ratio
     var windowRatio = window.innerWidth / window.innerHeight;
     
     // we already have in mind to use 100% of window width with game canvas, so let's 
     // calculate game height to cover the entire height of the window
     var gameHeight = gameOptions.gameWidth / windowRatio;
     
     // now we prepare to split the screen into floorsAmount floors, and each floor will take
     // 1 / floorsAmount of game height. We use these values to populate floorY array
     for(var i = 1; i <= gameOptions.floorsAmount; i++){
          gameOptions.floorY.push(gameHeight / gameOptions.floorsAmount * i - gameOptions.floorHeight);
     }
    
     // game creation	
	game = new Phaser.Game(gameOptions.gameWidth, gameHeight);
     
     // adding game state
     game.state.add("TheGame", TheGame);
     
     // starting game state
     game.state.start("TheGame");
}

var TheGame = function(){};

TheGame.prototype = {

     // when the state preloads
     preload: function(){
     
          // setting the game on maximum scale mode to cover the entire screen
          game.scale.scaleMode = Phaser.ScaleManager.SHOW_ALL;
          game.scale.pageAlignHorizontally = true;
          game.scale.pageAlignVertically = true;
          
          // the game will keep running even when it loses the focus
          game.stage.disableVisibilityChange = true; 
          
          // preloading the only game assets, a tile which will be used both for the square and the floor
		game.load.image("tile", "assets/sprites/tile.png"); 
          
          // preloading the bitmap font, generated with Littera bitmap font generator
          game.load.bitmapFont("font", "assets/fonts/font.png", "assets/fonts/font.fnt");
          
          // preloading the two audio files used in the game
          game.load.audio("jump", "assets/sounds/jump.mp3");
          game.load.audio("explosion", "assets/sounds/explosion.mp3");     
     }, 
     
     // once the state is ready
     create: function(){
     
          // handling local storage to retrieve the previously saved high score or to create a new local storage object with a zero score 
          this.savedData = localStorage.getItem(gameOptions.localStorageName) == null ? {score : 0} : JSON.parse(localStorage.getItem(gameOptions.localStorageName));
     
          // assigning the two sounds to variables to be called later
          this.jumpSound = game.add.audio("jump");
          this.explosionSound = game.add.audio("explosion");
     
          // variable to tell us if we are in demo mode, that is when the square jumps automatically
          this.demo = true;
          
          // variable to tell us if it's game over
          this.gameOver = false;
          
          // in this array we will store floor colors
          this.floorColors = [];
          
          // in this array we will store floor spikes (the obstacles)
          this.floorSpikes = [];
          
          // in this array we will store the bitmap texts showing the scores at each jump
          this.floorScores = [];
     
          // creating a copy of levelColors array
          var colorsArray = gameOptions.levelColors.slice();
     
          // bakckround group
          this.bgGroup = game.add.group();
     
          // creation of a group where we will place all floors
          this.groundGroup = game.add.group();
          
          // creation of a group where we will place all spikes, or obstacles, or whatever you will name them
          this.spikeGroup = game.add.group();
          
          // creation of a group where we will place all bitmap texts showing the scores
          this.scoreGroup = game.add.group();		
          
          // we start on the first floor
          this.levelFloor = 0;
          
          // adding the hero
          this.theSquare = game.add.sprite(0, 0, "tile");
          
          // setting hero registration point
          this.theSquare.anchor.set(0.5);
          
          // setting hero width and height
          this.theSquare.width = gameOptions.squareSize;
          this.theSquare.height = gameOptions.squareSize;
          
          // chen the hero jump?
          this.theSquare.canJump = true;
          
          // enabling ARCADE physics on the hero
          game.physics.enable(this.theSquare, Phaser.Physics.ARCADE);
          
          // setting hero horizontal velocity
          this.theSquare.body.velocity.x = gameOptions.squareSpeed;
          
          // gravity applied to the square
          this.theSquare.body.gravity.y = gameOptions.squareGravity;
          
          // a custom attribute to tell the player which color we are going to use at each floor
          this.theSquare.squareColor = [];
          
          // determining level height. Each "level" is a floor, but I am calling the variable levelHeight rather than
          // floorHeight not to be confused with gameOptions.floorHeight
          var levelHeight = game.height / gameOptions.floorsAmount;

          // time to create the floors
          for(var i = 0; i < gameOptions.floorY.length; i++){
          
               // each floorSpikes item is an array
               this.floorSpikes[i] = [];
               
               // each floorScores item is an array
               this.floorScores[i] = [];
               
               // creation of the background of each floor
               var bg = game.add.sprite(0, gameOptions.floorY[i] - levelHeight + gameOptions.floorHeight, "tile");
               
               // assigning background a width and a height
               bg.width = game.width;
               bg.height = levelHeight;
               
               // tintColor is a random colorsArray item. Then such item is removed from colorsArray so that
               // each floor will have a unique color
               var tintColor = Phaser.ArrayUtils.removeRandomItem(colorsArray)
               
               // choosing and removing a random tint color
               this.floorColors.push(tintColor);              
               
               // applying tint color to background
               bg.tint = tintColor;
               
               // setting background semi-transparent to make it look darker thanks to black canvas color
               bg.alpha = 0.5;
               
               // adding the background to its proper group
               this.bgGroup.add(bg);
          
               // creation of the floor pavement               
               var floor = game.add.sprite(0, gameOptions.floorY[i], "tile");
               
               // assigning floor pavement a width and a height 
               floor.width = game.width
               floor.height = gameOptions.floorHeight;
               
               
               // applying tint color to floor
               floor.tint = tintColor;	
               
               // setting floor semi-transparent to make it look darker thanks to black canvas color
               floor.alpha = 0.5;
               
               // let's enable ARCADE physics on floors too
               game.physics.enable(floor, Phaser.Physics.ARCADE);
               
               // floors can't move
               floor.body.immovable = true;
               
               // adding the floor to ground group
               this.groundGroup.add(floor);
               
               // this method will place the spikes
               this.placeSpikes(i)
          }
          
          // placing a particle emitter at coordinates 0, 0 (we'll place it in its proper position later) which can fire up to 30 particles
          this.emitter = game.add.emitter(0, 0, 30);
          
          // our particle is the same old "tile" image
          this.emitter.makeParticles("tile");
          
          // setting a gravity for each particle
          this.emitter.gravity = 200;
          
          // particles would be too big, so let's set their min and max scale.
          this.emitter.maxParticleScale = 0.1;
          this.emitter.minParticleScale = 0.05; 
          
          // finally placing the hero
          this.placeSquare();
          
          // creation of a new group which will contain all demo elements               
          this.demoGroup = game.add.group();
     
          // we start with an overlay covering the entire game area
          var blackOverlay = game.add.sprite(0, 0, "tile");
          blackOverlay.width = game.width;
          blackOverlay.height = game.height;
          
          // tinting the overlay with black     
          blackOverlay.tint = 0x000000;
     
          // setting the overlay 70% opaque
          blackOverlay.alpha = 0.7;
          
          // adding blackOverlay to demoGroup group
          this.demoGroup.add(blackOverlay);
          
          // adding a bitmap text with game title
          var titleText = game.add.bitmapText(game.width / 2, game.height / 5, "font", "Just Jump", 48);
          
          // setting titleText anchor point to 0.5 (the centre)
          titleText.anchor.set(0.5);
          
          // adding titleText to demoGroup group
          this.demoGroup.add(titleText);
          
          // same thing goes with infoText
          var infoText = game.add.bitmapText(game.width / 2, game.height / 5 * 2, "font", "Tap / Click to jump", 24);
          infoText.anchor.set(0.5, 0.5);
          this.demoGroup.add(infoText);
          
          // if you still haven't played the game, set score variable to zero
          if(!this.score){
               this.score = 0;
          }
          
          // now same concept we saw before now applies with scoresText, we are printing both the latest score and the top score
          var scoresText = game.add.bitmapText(game.width / 2, game.height / 5 * 4, "font", "Latest score\n" + this.score.toString() + "\n\nBest score\n" + this.savedData.score.toString(), 24);
          scoresText.anchor.set(0.5, 0.5);
          scoresText.align = "center";
          this.demoGroup.add(scoresText);
          
          // last but not least, let's add version text
          var versionText = game.add.bitmapText(game.width, game.height, "font", "v" + gameOptions.version, 24);
          versionText.anchor.set(1, 1);
          this.demoGroup.add(versionText);
          
          // waiting for player input, then call squareJump function
          game.input.onDown.add(this.squareJump, this);
     },
     
     // function to be executed at each frame
     update: function(){
     
          // is the game over?
          if(!this.gameOver){
          
               // making the hero collide with floors so it won't fallo down
               game.physics.arcade.collide(this.theSquare, this.groundGroup);
               
               // checking if the hero overlaps with anything in spike group
               game.physics.arcade.overlap(this.theSquare, this.spikeGroup, function(){
               
                    // placing the emitter over the player
                    this.emitter.x = this.theSquare.x;
                    this.emitter.y = this.theSquare.y;
                    
                    // firing 10 particles at once with a 1000 milliseconds lifespan
                    this.emitter.start(true, 1000, null, 10);
                    
                    // tinting particles with the same player color
                    this.emitter.forEach(function(particle) {
                         particle.tint = this.theSquare.tint;
                    }, this);
                    
                    // do not wait any longer for input
                    game.input.onDown.remove(this.squareJump, this);
                    
                    // play explosion sound
                    this.explosionSound.play();
                    
                    // game over, man!!
                    this.gameOver = true; 
                    
                    // updating localstorage setting score as the max value between current score and saved score
                    localStorage.setItem(gameOptions.localStorageName,JSON.stringify({
                         score: Math.max(this.score, this.savedData.score)
     	          }));                 
                    
                    // wait two seconds before restarting the game
                    game.time.events.add(Phaser.Timer.SECOND * 2, function(){
                         game.state.start("TheGame");     
                    }, this);
                          
               }, null, this);
                              
               // if the hero leaves the floor to the right or to the left...
               if((this.theSquare.x > game.width && this.levelFloor % 2 == 0) || (this.theSquare.x < 0 && this.levelFloor % 2 == 1)){
                    
                    // calling moveSpikes method to update spikes position and width
                    this.moveSpikes(this.levelFloor);
                    
                    // increasing floor number or setting it back to zero
                    this.levelFloor = (this.levelFloor + 1) % gameOptions.floorY.length;                   
                    
                    // placing player at the beginning of the floor
                    this.placeSquare();
               }
               
               // we'll enter this block if the hero just landed, that is it's touching its bottom side and it can't jump yet 
               if(!this.theSquare.canJump && this.theSquare.body.touching.down){
               
                    // now the hero can jump again
                    this.theSquare.canJump = true; 
                    
                    // this statement checks if we jumped a spike:
                    // * we jumped more than zero times
                    // * we jumped less than or equal to gameOptions.spikesAmount
                    // * it's not a demo 
                    if(this.jumps > 0 && this.jumps <= gameOptions.spikesAmount && !this.demo){
                         
                         // now jumpLen takes the value of the square when it was in the middle of the jump
                         this.jumpLen = this.jumpLen + (this.theSquare.x - this.jumpLen) / 2;
                         
                         // precision is the horizontal distance from the square in the middle of the jump and spike position
                         // the smaller its value, the more perfect the jump
                         var precision = Math.round(Math.abs(this.jumpLen - this.floorSpikes[this.levelFloor][this.jumps - 1].x));
                         
                         // showing the bitmap text above the spike we just jumped
                         this.floorScores[this.levelFloor][this.jumps - 1].visible = true;
                         
                         // if precision is less than 10 (a good jump)
                         if(precision < 10){
                              
                              // increase the score
                              this.score += (10 - precision) * 10;
                              
                              // show jump score
                              this.floorScores[this.levelFloor][this.jumps - 1].text = (10 - precision) * 10;
                         }
                         
                         // otherwise tell the player it was a bad jump
                         else{
                              this.floorScores[this.levelFloor][this.jumps - 1].text = "BAD";
                         }
                    }
               }
               
               // if this is the demo...
               if(this.demo){
                    
                    // if there are spikes ahead the hero and we are close enough to next spike to allow hero to jump it...
                    if((this.jumps < gameOptions.spikesAmount) && (Math.abs(this.floorSpikes[this.levelFloor][this.jumps].x - this.theSquare.x) < 88)){
                         
                         // se the hero jump!!
                         this.squareJump();
                    }
               }          
          }     
     },
     
     // when the player starts running on a floor
     placeSquare: function(){
     
          // at the beginning of the floor, the player jumped zero times
          this.jumps = 0;

          // properly tint the square according to floor number
          this.theSquare.tint = this.floorColors[this.levelFloor];
          
          // adjusting hero speed according to floor number: from left to right on even floors, from right to left on odd floors
          this.theSquare.body.velocity.x = (this.levelFloor % 2 == 0) ? gameOptions.squareSpeed : -gameOptions.squareSpeed; 
          
          // no vertical velocity
          this.theSquare.body.velocity.y = 0;
          
          // the hero can jump again 
          this.theSquare.canjump = true; 
          
          // adjusting hero vertical and horizontal position
          this.theSquare.y = gameOptions.floorY[this.levelFloor] - gameOptions.squareSize / 2;
          this.theSquare.x = (this.levelFloor % 2 == 0) ? 0 : game.width;   
          
          // stopping the jump tween if running
          if(this.jumpTween && this.jumpTween.isRunning){
               this.jumpTween.stop();
               this.theSquare.angle = 0;
          }               
     },
     
     placeSpikes: function(floor){
                         
          // time to place the spikes
          // let's loop through this level spikes
          for(var i = 1; i <= gameOptions.spikesAmount; i++){
          
               // creating the spike as a tileSprite
               var spike = game.add.sprite((floor % 2 == 0) ? game.width : 0, gameOptions.floorY[floor], "tile");
               spike.height = gameOptions.spikeHeight;
               
               // applying spikes the same tint color used for the ground
               spike.tint = this.floorColors[floor];
               
               // setting spike semi-transparent to make it look darker thanks to black canvas color
               spike.alpha = 0.5;
               
               // setting spike anchor point
               spike.anchor.set(0.5, 1);
               
               // enabling ARCADE physics to the spike
               game.physics.enable(spike, Phaser.Physics.ARCADE);
               
               // spikes can't move
               spike.body.immovable = true;
               
               // adding the spike to spike group
               this.spikeGroup.add(spike);
               
               // adding the spike to floorSpikes array
               this.floorSpikes[floor].push(spike);
               
               // adding a bitmap text above each spike
               var scoreText = game.add.bitmapText(0, gameOptions.floorY[floor] - 60, "font", "100", 24);
               
               // set text registration point
               scoreText.anchor.set(0.5);
               
               // set text aligment
               scoreText.align = "center";
               
               // do not show the text at the moment
               scoreText.visible = false;
               
               // adding the score bitmap text to scoreGroup group 
               this.scoreGroup.add(scoreText);
               
               // adding the score to floorScores array
               this.floorScores[floor].push(scoreText);
               
               // now let's move the spikes of this floor
               this.moveSpikes(floor);               			
          }
     },
     
     moveSpikes: function(floor){
     
          // the first obstacle will be placed at 180 if we are on aneven floor, game.width - 180 if we are on an odd floor
          var obstacleX = (floor % 2 == 0) ? 180 : game.width - 180;
          
          // looping through all obstacles in this floor
          for(var i = 0; i < this.floorSpikes[floor].length; i++){
          
               // assigning a new width to the obstacle
               var newWidth = game.rnd.integerInRange(1, 16) * 2;
          
               // adjusting spike physical body size
               this.floorSpikes[floor][i].body.setSize(newWidth, this.floorSpikes[floor][i].height);  
               
               // re-positioning score text accordingly
               this.floorScores[floor][i].x = obstacleX;
               this.floorScores[floor][i].visible = false;
          
               // placing next obstacle between 150 and 200 pixels
               var obstacleGap = game.rnd.integerInRange(150, 200);
               
               // moving and resizing the obstacle with a tween
               var obstacleTween = game.add.tween(this.floorSpikes[floor][i]).to({
                    x: obstacleX,
                    width: newWidth 
               }, 250, Phaser.Easing.Linear.None, true)
               
               // determining next obstacle position
               obstacleX += (floor % 2 == 0) ? obstacleGap : - obstacleGap;                      
          }          
     },
     
     // when the player jumps
     squareJump: function(e){
     
          // we want e not to be undefined and demo to be true to say the player touched the screen
          // or clicked to mouse to start playinh
          if(e != undefined && this.demo){
          
               // not a demo anymore
               this.demo = false;
               
               // destroying demoGroup and its content, removing titles, overlay, and everything not
               // strictly related to the game 
               this.demoGroup.destroy();
               
               // starting from first floor
               this.levelFloor = 0;
               
               // resetting the score
               this.score = 0;
               
               // placing the square
               this.placeSquare();
               
               // no more else to do
               return;
          }
          
          // if the hero can jump...
          if(this.theSquare.canJump){
          
               // we save the position the square started jumping
               this.jumpLen = this.theSquare.x;
               
               // increasing the number of jumps
               this.jumps ++;
                        
               // preventing it to jump while in the air
               this.theSquare.canJump = false;
               
               // adding a vertical force to the player
               this.theSquare.body.velocity.y = gameOptions.jumpForce;
               
               // setting a jump rotation angle just to make the square rotate
               var jumpAngle = this.levelFloor % 2 == 0 ? 180 : -180;
               
               // using a tween to rotate the player
               this.jumpTween = game.add.tween(this.theSquare).to({
                    angle: this.theSquare.angle + jumpAngle
               }, gameOptions.jumpTime, Phaser.Easing.Linear.None, true);
               
               // if this is not a demo...
               if(!this.demo){
               
                    // playing jump sound
                    this.jumpSound.play();
               }
          }
     }    
}