import { angleEquals } from "../vector/angle-equals.js";
import { getAngleClockwiseFromYAxis } from "../vector/get-angle-clockwise-from-y-axis.js";

const { PI, hypot } = Math;


const ANGLE_PRECISION = 2**-10;


function comparePoints(
        a: number[],
        b: number[]) {

    const _θa = getAngleClockwiseFromYAxis(a);
    const _θb = getAngleClockwiseFromYAxis(b);

    const θa = _θa > 2*PI - ANGLE_PRECISION ? 0 : _θa;
    const θb = _θb > 2*PI - ANGLE_PRECISION ? 0 : _θb;

    if (angleEquals(θa,θb)) {
        return hypot(...a) - hypot(...b);
    }

    return θa - θb;
}


export { comparePoints }