"use strict";

var coRestitution = 0.018;
var coFriction = 0.01;

class Particle {
  constructor(x, y) {
    this.pos = createVector(x, y);
    this.vel = createVector(random(-10, 10), random(-10, 10));
    this.acc = createVector(0, 0);

    this.targetPos = createVector(width / 2, height / 2);
    this.lerpSpeed = random(0.05, 0.1);
    //255, 120, 20, 70
    this.r = 200; //random(255);
    this.g = 120; //random(255);
    this.b = 20; //random(255);

    this.rad = random(2, 3.5);
  }

  moveWithLerp() {
    this.pos = p5.Vector.lerp(this.pos, this.targetPos, this.lerpSpeed);
  }

  applyForce(f) {
    this.acc.add(f)
  }

  update() {
    this.vel.add(this.acc);
    this.pos.add(this.vel);
    this.acc.mult(0);
  }

  display() {
    push();
    translate(this.pos.x, this.pos.y);
    noStroke();
    //stroke(0);
    //strokeWeight(1);
    fill(this.r, this.g, this.b);
    blendMode(ADD);
    ellipse(0, 0, this.rad * 2, this.rad * 2);
    pop();
  }

  checkBoundaries() {
    var force = createVector(0, 0);
    //x
    if (this.pos.x < 0 + this.rad) {
      this.pos.x = 0 + this.rad;
      this.vel.x = -this.vel.x * 0.3;
    } else if (this.pos.x > width - this.rad) {
      this.pos.x = width - this.rad;
      this.vel.x = -this.vel.x * 0.3;
    }
    // y
    if (this.pos.y < 0 + this.rad) {
      this.pos.y = 0 + this.rad;
      this.vel.y = -this.vel.y * 0.3;
    } else if (this.pos.y > height - this.rad) {
      this.pos.y = height - this.rad;
      this.vel.y = -this.vel.y * 0.3;
    }
  }

  /*
    checkCollision(other) {
      var distance = this.pos.dist(other.pos);
      if (distance < this.rad + other.rad) {
        // this
        var force = p5.Vector.sub(other.pos, this.pos);
        force.normalize();
        force.mult(-1);
        force.mult(other.vel.mag());
        this.applyForce(force);
        this.vel.mult(coRestitution);

        var friction = p5.Vector.mult(this.vel, -1);
        friction.normalize();
        friction.mult(coFriction);
        friction.limit(this.vel.mag());
        other.applyForce(friction);

        // other
        var force = p5.Vector.sub(this.pos, other.pos);
        force.normalize();
        force.mult(-1);
        force.mult(this.vel.mag());
        other.applyForce(force);
        other.vel.mult(coRestitution);

        var friction = p5.Vector.mult(other.vel, -1);
        friction.normalize();
        friction.mult(coFriction);
        friction.limit(other.vel.mag());
        other.applyForce(friction);
      }
    }
    */
}