/**
 * Created by kuppa on 4/3/15.
 */
var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create, update: update, render: render });
function preload()
{
    game.load.image('ship','invaders/player.png');
    game.load.image('bullet','invaders/bullets.png');
    game.load.image('invader','invaders/invader32x32x4.png',32,32);
    game.load.image('enemyBullet','invaders/enemy-bullet.png');
    game.load.image('starfield','invaders/starfield.png');
    game.load.image('background','invaders/background2.png');
    game.load.spritesheet('kaboom','invaders/explode.png',120,120);
}
var player;
var aliens;
var bullets;
var bulletTime = 0;
var cursors;
var fireButton;
var explosions;
var starfield;
var score = 0;
var scoreString = '';
var scoreText;
var lives;
var enemyBullet;
var firingTimer = 0;
var stateText;
var livingEnemies = [];
function create()
{
 game.physics.startSystem(Phaser.Physics.ARCADE);
 starfield = game.add.tileSprite(0,0,800,600,'starfield');
    bullets = game.add.group();
    bullets.enableBody = true;
    bullets.physicsBodyType = Phaser.Physics.ARCADE;
    bullets.createMultiple(30, 'bullet');
    bullets.setAll('anchor.x', 0.5);
    bullets.setAll('anchor.y', 1);
    bullets.setAll('outOfBoundsKill', true);
    bullets.setAll('checkWorldBounds', true);
    enemyBullets = game.add.group();
    enemyBullets.enableBody = true;
    enemyBullets.physicsBodyType = Phaser.Physics.ARCADE;
    enemyBullets.createMultiple(30, 'enemyBullet');
    enemyBullets.setAll('anchor.x', 0.5);
    enemyBullets.setAll('anchor.y', 1);
    enemyBullets.setAll('outOfBoundsKill', true);
    enemyBullets.setAll('checkWorldBounds', true);
    player = game.add.sprite(400, 500, 'ship');
    player.anchor.setTo(0.5, 0.5);
    game.physics.enable(player, Phaser.Physics.ARCADE);
    aliens = game.add.group();
    aliens.enableBody = true;
    aliens.physicsBodyType = Phaser.Physics.ARCADE;
    scoreString = 'Score : ';
    scoreText = game.add.text(10, 10, scoreString + score, { font: '34px Arial', fill: '#fff' });
    lives = game.add.group();
    game.add.text(game.world.width - 100, 10, 'Lives : ', { font: '34px Arial', fill: '#fff' });
    stateText = game.add.text(game.world.centerX,game.world.centerY,' ', { font: '84px Arial', fill: '#fff' });
    stateText.anchor.setTo(0.5, 0.5);
    stateText.visible = false;
    stateText = game.add.text(game.world.centerX,game.world.centerY,' ', { font: '84px Arial', fill: '#fff' });
    stateText.anchor.setTo(0.5, 0.5);
    stateText.visible = false;
    for (var i = 0; i < 3; i++)
    {
        var ship = lives.create(game.world.width - 100 + (30 * i), 60, 'ship');
        ship.anchor.setTo(0.5, 0.5);
        ship.angle = 90;
        ship.alpha = 0.4;
    }
    explosions = game.add.group();
    explosions.createMultiple(30, 'kaboom');
    explosions.forEach(setupInvader, this);
    cursors = game.input.keyboard.createCursorKeys();
    fireButton = game.input.keyboard.addKey(Phaser.Keyboard.SPACEBAR);
    function createAliens () {

        for (var y = 0; y < 4; y++)
        {
            for (var x = 0; x < 10; x++)
            {
                var alien = aliens.create(x * 48, y * 50, 'invader');
                alien.anchor.setTo(0.5, 0.5);
                alien.animations.add('fly', [ 0, 1, 2, 3 ], 20, true);
                alien.play('fly');
                alien.body.moves = false;
            }
        }

        aliens.x = 100;
        aliens.y = 50;

        //  All this does is basically start the invaders moving. Notice we're moving the Group they belong to, rather than the invaders directly.
        var tween = game.add.tween(aliens).to( { x: 200 }, 2000, Phaser.Easing.Linear.None, true, 0, 1000, true);

        //  When the tween loops it calls descend
        tween.onLoop.add(descend, this);
    }

    function setupInvader (invader) {

        invader.anchor.x = 0.5;
        invader.anchor.y = 0.5;
        invader.animations.add('kaboom');

    }

    function descend() {

        aliens.y += 10;

    }

    function update() {
        starfield.tilePosition.y += 2;

        if (player.alive)
        {
            //  Reset the player, then check for movement keys
            player.body.velocity.setTo(0, 0);

            if (cursors.left.isDown)
            {
                player.body.velocity.x = -200;
            }
            else if (cursors.right.isDown)
            {
                player.body.velocity.x = 200;
            }

            //  Firing?
            if (fireButton.isDown)
            {
                fireBullet();
            }

            if (game.time.now > firingTimer)
            {
                enemyFires();
            }

            //  Run collision
            game.physics.arcade.overlap(bullets, aliens, collisionHandler, null, this);
            game.physics.arcade.overlap(enemyBullets, player, enemyHitsPlayer, null, this);
        }

    }

    function render() {

         for (var i = 0; i < aliens.length; i++)
        {
            game.debug.body(aliens.children[i]);
        }

    }

    function collisionHandler (bullet, alien) {

        //  When a bullet hits an alien we kill them both
        bullet.kill();
        alien.kill();

        //  Increase the score
        score += 20;
        scoreText.text = scoreString + score;

        //  And create an explosion :)
        var explosion = explosions.getFirstExists(false);
        explosion.reset(alien.body.x, alien.body.y);
        explosion.play('kaboom', 30, false, true);

        if (aliens.countLiving() == 0)
        {
            score += 1000;
            scoreText.text = scoreString + score;

            enemyBullets.callAll('kill',this);
            stateText.text = " You Won, \n Click to restart";
            stateText.visible = true;

            //the "click to restart" handler
            game.input.onTap.addOnce(restart,this);
        }

    }

    function enemyHitsPlayer (player,bullet) {

        bullet.kill();

        live = lives.getFirstAlive();

        if (live)
        {
            live.kill();
        }

        //  And create an explosion :)
        var explosion = explosions.getFirstExists(false);
        explosion.reset(player.body.x, player.body.y);
        explosion.play('kaboom', 30, false, true);

        // When the player dies
        if (lives.countLiving() < 1)
        {
            player.kill();
            enemyBullets.callAll('kill');

            stateText.text=" GAME OVER \n Click to restart";
            stateText.visible = true;

            //the "click to restart" handler
            game.input.onTap.addOnce(restart,this);
        }

    }

    function enemyFires () {

        //  Grab the first bullet we can from the pool
        enemyBullet = enemyBullets.getFirstExists(false);

        livingEnemies.length=0;

        aliens.forEachAlive(function(alien){

            // put every living enemy in an array
            livingEnemies.push(alien);
        });


        if (enemyBullet && livingEnemies.length > 0)
        {

            var random=game.rnd.integerInRange(0,livingEnemies.length-1);

            // randomly select one of them
            var shooter=livingEnemies[random];
            // And fire the bullet from this enemy
            enemyBullet.reset(shooter.body.x, shooter.body.y);

            game.physics.arcade.moveToObject(enemyBullet,player,120);
            firingTimer = game.time.now + 2000;
        }

    }

    function fireBullet () {

        //  To avoid them being allowed to fire too fast we set a time limit
        if (game.time.now > bulletTime)
        {
            //  Grab the first bullet we can from the pool
            bullet = bullets.getFirstExists(false);

            if (bullet)
            {
                //  And fire it
                bullet.reset(player.x, player.y + 8);
                bullet.body.velocity.y = -400;
                bulletTime = game.time.now + 200;
            }
        }

    }

    function resetBullet (bullet) {

        //  Called if the bullet goes out of the screen
        bullet.kill();

    }

    function restart () {

        //  A new level starts

        //resets the life count
        lives.callAll('revive');
        //  And brings the aliens back from the dead :)
        aliens.removeAll();
        createAliens();

        //revives the player
        player.revive();
        //hides the text
        stateText.visible = false;

    }

}