//  Phaser.Physics.Arcade.PhysicsGroup

var ArcadeSprite = require('./ArcadeSprite');
var Class = require('../../utils/Class');
var CONST = require('./const');
var GetFastValue = require('../../utils/object/GetFastValue');
var Group = require('../../gameobjects/group/Group');

var PhysicsGroup = new Class({

    Extends: Group,

    initialize:

    function PhysicsGroup (world, scene, children, config)
    {
        if (config === undefined && !Array.isArray(children) && typeof children === 'object')
        {
            config = children;
            children = null;
        }
        else if (config === undefined)
        {
            config = {};
        }

        this.world = world;

        config.createCallback = this.createCallback;
        config.removeCallback = this.removeCallback;
        config.classType = ArcadeSprite;

        this.physicsType = CONST.DYNAMIC_BODY;

        this.defaults = {
            setCollideWorldBounds: GetFastValue(config, 'collideWorldBounds', false),
            setAccelerationX: GetFastValue(config, 'accelerationX', 0),
            setAccelerationY: GetFastValue(config, 'accelerationY', 0),
            setBounceX: GetFastValue(config, 'bounceX', 0),
            setBounceY: GetFastValue(config, 'bounceY', 0),
            setDragX: GetFastValue(config, 'dragX', 0),
            setDragY: GetFastValue(config, 'dragY', 0),
            setGravityX: GetFastValue(config, 'gravityX', 0),
            setGravityY: GetFastValue(config, 'gravityY', 0),
            setFrictionX: GetFastValue(config, 'frictionX', 0),
            setFrictionY: GetFastValue(config, 'frictionY', 0),
            setVelocityX: GetFastValue(config, 'velocityX', 0),
            setVelocityY: GetFastValue(config, 'velocityY', 0),
            setAngularVelocity: GetFastValue(config, 'angularVelocity', 0),
            setAngularAcceleration: GetFastValue(config, 'angularAcceleration', 0),
            setAngularDrag: GetFastValue(config, 'angularDrag', 0),
            setMass: GetFastValue(config, 'mass', 1),
            setImmovable: GetFastValue(config, 'immovable', false)
        };

        Group.call(this, scene, children, config);
    },

    createCallback: function (child)
    {
        if (!child.body)
        {
            this.world.enableBody(child, CONST.DYNAMIC_BODY);
        }

        var body = child.body;

        for (var key in this.defaults)
        {
            body[key](this.defaults[key]);
        }
    },

    removeCallback: function (child)
    {
        if (child.body)
        {
            this.world.disableBody(child);
        }
    },

    setVelocity: function (x, y, step)
    {
        if (step === undefined) { step = 0; }

        var items = this.getChildren();

        for (var i = 0; i < items.length; i++)
        {
            items[i].body.velocity.set(x + (i * step), y + (i * step));
        }

        return this;
    },

    setVelocityX: function (value, step)
    {
        if (step === undefined) { step = 0; }

        var items = this.getChildren();

        for (var i = 0; i < items.length; i++)
        {
            items[i].body.velocity.x = value + (i * step);
        }

        return this;
    },

    setVelocityY: function (value, step)
    {
        if (step === undefined) { step = 0; }

        var items = this.getChildren();

        for (var i = 0; i < items.length; i++)
        {
            items[i].body.velocity.y = value + (i * step);
        }

        return this;
    }

});

module.exports = PhysicsGroup;