import { Vector } from "./vector.js";

export class KepplerObject {
    constructor(name, mass, radius, position, velocity, color) {
        this.mass = mass;
        this.name = name;
        this.radius = radius;
        this.position = position;
        this.velocity = velocity;
        this.color = color;
        this.trails = [];
    }

    draw(ctx) {
        for (let t of this.trails) {
            ctx.strokeStyle = this.color;
            ctx.moveTo(t.x, t.y);
            ctx.lineTo(t.x + 1, t.y + 1);
            ctx.stroke();
        }

        ctx.strokeStyle = this.color;
        ctx.fillStyle = this.color;
        ctx.beginPath();
        ctx.arc(this.position.x, this.position.y, this.radius, 0, 2 * Math.PI);
        ctx.fill();
    }

    track() {
        let maxTrack = 100;
        this.trails.push(this.position.copy());

        if (this.trails.length > maxTrack) {
            this.trails = this.trails.slice(1, maxTrack);
        }
    }

    attrackt(kepObj) {
        let f = this.getForce(kepObj);

        let direction = new Vector(this.position.x - kepObj.position.x, this.position.y - kepObj.position.y).normalize();

        let velocity = f / this.mass;
        this.velocity.x -= velocity * direction.x;
        this.velocity.y -= velocity * direction.y;
    }

    move() {
        this.position.x += this.velocity.x;
        this.position.y += this.velocity.y;
    }

    getForce(o2) {
        let G = 5;
        let dist = this.position.getDistance(o2.position);
        let f = G * (this.mass * o2.mass) / (dist * dist);
        return f;
    }
}