pc.script.create('dynamic_character_controller', function (context) {
    var SPEED = 5;
    var JUMP_IMPULSE = 400;

    var origin = pc.Vec3(0,0,0);
    var groundCheckRay = pc.Vec3(0, -0.51, 0);
    var rayEnd = pc.Vec3(0,0,0);

    var DynamicCharacterController = function (entity) {
        this.entity = entity;

        this.speed = SPEED;
        this.jumpImpulse = pc.Vec3(0, JUMP_IMPULSE, 0);

        this.onGround = true;
    };

    DynamicCharacterController.prototype = {
        initialize: function () {
            // Prevent any rotation of the rigid body
            this.entity.rigidbody.angularFactor = 0;
        },

        update: function (dt) {
            this._checkGround();
        },

        /**
        * Move the character in the direction supplied
        */
        move: function (direction) {
            if (this.onGround) {
                this.entity.rigidbody.activate();
                pc.Vec3.scale(direction, this.speed, direction);
                this.entity.rigidbody.linearVelocity = pc.Vec3(direction[0], direction[1], direction[2]);
            }
        },

        /**
        * Make the character jump
        */
        jump: function () {
            if (this.onGround) {
                this.self.rigidbody.activate();
                this.self.rigidbody.applyImpulse(this.jumpImpulse, origin);
                this.onGround = false;
            }
        },

        /**
        * Check to see if the character is standing on something
        */
        _checkGround: function () {
            var self = this;
            var pos = this.entity.getPosition();
            pc.Vec3.add(pos, groundCheckRay, rayEnd);
            self.onGround = false;

            // Fire a ray straight down to just below the bottom of the rigid body,
            // if it hits something then the character is standing on something.
            context.systems.rigidbody.raycastFirst(pos, rayEnd, function (result) {
                self.onGround = true;
            });
        }
    };

   return DynamicCharacterController;
});