(function() {
    var self = this;

    var DEFAULT_ACCELERATION = { x: 0, y: -10, z: 0 };
    var BOOST_ACCELERATION = { x: 0, y: 1, z: 0 };
    var STATE_IDLE = 0;
    var STATE_BOOSTING = 1;
    var STATE_LAUNCHING = 2;

    self.state = STATE_IDLE;

    self.entityID = null;
    self.launching = false;

    self.preload = function(entityID) {
        self.entityID = entityID;
    }

    self.startBoost = function() {
        if (self.state === STATE_IDLE) {
            self.state = STATE_BOOSTING;
            self.setParticlesOn(true);
            Entities.editEntity(self.entityID, { gravity: BOOST_ACCELERATION });
        }
    }
    self.stopBoost = function() {
        if (self.state === STATE_BOOSTING) {
            self.state = STATE_IDLE;
            self.setParticlesOn(false);
            Entities.editEntity(self.entityID, { gravity: DEFAULT_ACCELERATION });
        }
    }

    self.launch = function() {
        print("here");
        if (self.state === STATE_LAUNCHING) {
            return;
        }

        print("here2");

        self.state = STATE_LAUNCHING;
        self.setParticlesOn(true);

        Script.setTimeout(function() {
            Entities.editEntity(self.entityID, { gravity: { x: 0, y: 1.0, z: 0 } });
        }, 500);
        Script.setTimeout(function() {
            Entities.editEntity(self.entityID, { gravity: { x: 0, y: 0.4, z: 0 } });
        }, 2000);
        Script.setTimeout(function() {
            Entities.editEntity(self.entityID, { velocity: { x: 0, y: 20 + Math.random() * 80, z: 0 }, gravity: DEFAULT_ACCELERATION });
        }, 3000);
        Script.setTimeout(function() {
            print("Done");
            //Entities.editEntity(self.entityID, { gravity: DEFAULT_ACCELERATION });
            self.setParticlesOn(false);
            self.state = STATE_IDLE;
        }, 4000);
    }

    self.setParticlesOn = function(on) {
        var childrenIDs = Entities.getChildrenIDs(self.entityID);
        for (var i = 0; i < childrenIDs.length; ++i) {
            var entityID = childrenIDs[i];
            if (Entities.getEntityProperties(entityID, 'type').type === 'ParticleEffect') {
                Entities.editEntity(entityID, { emitRate: (on ? 200 : 0) });
            }
        }
    }


    //self.clickDownOnEntity = self.launch;
    Messages.subscribe('RocketChair');
    Messages.messageReceived.connect(this, function(channel, message, sender) {
        if (channel === 'RocketChair') {
            if (message === 'startBoost') {
                self.startBoost();
            } else if (message === 'stopBoost') {
                self.stopBoost();
            } else if (message === 'launch') {
                self.launch();
            }
        }
    });

    var timerID = Script.setInterval(function() {
        var props = Entities.getEntityProperties(self.entityID, ['velocity', 'rotation']);
        if (Vec3.length(props.velocity) < 0.1) {
            var up = Vec3.multiplyQbyV(props.rotation, { x: 0, y: 1, z: 0 });
            var angleFromUp = Math.acos(Vec3.dot(up, { x: 0, y: 1, z: 0 }));
            print("Angle is ", angleFromUp);
            if (angleFromUp > Math.PI / 4) {
                Entities.editEntity(self.entityID, { rotation: { x: 0, y: 0, z: 0, w: 1 } });
            }

        }
    }, 2000);

    Script.scriptEnding.connect(function() {
        Messages.messageReceived.disconnect(this);
        Script.clearInterval(timerID);
    });
    return self;
})