let velocity;

let gravity;

let position;

let acceleration;

let breeze;

let drag = 0.99;

let mass = 50;

let heightOfBall = 0;

function setup() {

  createCanvas(640, 360); 

  noFill();

  position = createVector(width/2, 0);

  velocity = createVector(0,0);

  acceleration = createVector(0,0);

  gravity = createVector(0, 0.5*mass);

  breeze = createVector(0,0); 

}

function draw() {

  background(215);

  fill(0);

  if (!serialActive) {

    text("Press the space bar to select the serial Port", 20, 30);

  }

  else 

  {

    text("Arduino is connected! Press b to jump.", 20, 30);

  applyForce(breeze);

  applyForce(gravity);

  velocity.add(acceleration);

  velocity.mult(drag);

  position.add(velocity);

  acceleration.mult(0);

  ellipse(position.x,position.y,mass,mass);

  if (position.y > height-mass/2) {

      velocity.y *= -0.9;  // A little dampening when hitting the bottom

      position.y = height-mass/2;

    heightOfBall = 0;

    } 

    else {

      heightOfBall = 1;

    }

  }

}

function applyForce(force){

  // Newton's 2nd law: F = M * A

  // or A = F / M

  let f = p5.Vector.div(force, mass);

  acceleration.add(f);

}

function keyPressed() {

  if (key == " ") {

    // important to have in order to start the serial connection!!

    setUpSerial();

  }   

  else if (key=='b'){

    mass=random(15,80);

    position.y=-mass;

    velocity.mult(0);

  }

}

// this callback function

function readSerial(data) {

    ////////////////////////////////////

    //READ FROM ARDUINO HERE

    ////////////////////////////////////

     if (data != null) {

    // make sure there is actually a message

    let fromArduino = split(trim(data), ",");

       // if the right length, then proceed

    if (fromArduino.length == 1) {

      let sensorVal = int(fromArduino[0]);

//for values less than 400,wind blows to right

      if (sensorVal < 400){

        breeze.x=1

      }

//if value between 400 and 500, wind stops so ball stops

      else if(sensorVal >= 400 && sensorVal < 500){

        breeze.x = 0

      }

//if value greater than 500, wind blows to left

      else {

        breeze.x = -1

      }

          //////////////////////////////////

          //SEND TO ARDUINO HERE (handshake)

          //////////////////////////////////

    }

//height of ball sent to arduino to check if ball on floor or not

    let sendToArduino = heightOfBall  + "\n";

    writeSerial(sendToArduino);

  }

}