/* globals Script Entities Vec3 */

(function() {

    var goingUp = true;

    var pointA = {x: -17.8275, y: -9.9549, z: 3.7508};
    var pointB = {x: -17.8275, y: 109.1, z: 3.7508};
    
    var pauseTime_ground = 10; // seconds
    var pauseTime_top = 27;
    var MOVE_TIME_UP = 20;
    var DROP_TIME = 3;

    var _entityID;
    this.preload = function(entityID) {
        _entityID = entityID;
        Script.setInterval(function() {
            movePlatform(goingUp);
            goingUp = !goingUp;
        }, (pauseTime_ground + MOVE_TIME_UP) * 1000);
    };
  
    var movePlatform = function(isGoingUp) {
        var from = isGoingUp ? pointA : pointB;
        var to = isGoingUp ? pointB : pointA;
        var moveTime = isGoingUp ? MOVE_TIME_UP : DROP_TIME;

        var moveDirection = Vec3.subtract(to , from);
        var moveVelocity = Vec3.multiply(moveDirection, 1 / moveTime);

        Entities.editEntity(_entityID, {
            velocity: moveVelocity,
            position: from,
            damping: 0
        });

        Script.setTimeout(function() {
            Entities.editEntity(_entityID, {
                velocity: {x: 0, y: 0, z: 0},
                position: to
            });
        }, moveTime * 1000);

    };
  
});