import {state, BaseComponent} from './BaseComponent';

export class Vec2 extends BaseComponent {

    get x() {
        return this[state][0];
    }

    get y() {
        return this[state][1];
    }

    get length() {
        const {x, y} = this;
        return Math.sqrt(x * x + y * y);
    }

    normalize() {
        const {x, y, length} = this;
        return length > 0 ? vec2({x: x / length, y: y / length}) : vec2();
    }
}

const vec2 = (() => {
    "use strict";

    return Object.assign((x = 0, y = 0) => {
        return Object.freeze(new Vec2([x, y]));
    }, {

        direction(angle) {
            const x = Math.cos(angle);
            const y = Math.sin(angle);
            return vec2({x, y});
        },

        dot(vecA, vecB) {
            return vecA.x * vecB.x + vecA.y * vecB.y;
        }
    });

})();

export default vec2;