/** @format */

export class Line {
    public direction: Vector2
    public point: Vector2
}

export class Vector2 {
    public x: number
    public y: number

    constructor(x: number = 0, y: number = 0) {
        this.x = x
        this.y = y
    }

    public static multiply(vector1: Vector2, vector2: Vector2) {
        return vector1.x * vector2.x + vector1.y * vector2.y
    }

    public static multiply2(scalar: number, vector: Vector2) {
        return new Vector2(vector.x * scalar, vector.y * scalar)
    }

    public static division(vector: Vector2, scalar: number) {
        if (scalar == 0) scalar = 1
        return new Vector2(vector.x / scalar, vector.y / scalar)
    }

    public static subtract(vector1: Vector2, vector2: Vector2) {
        return new Vector2(vector1.x - vector2.x, vector1.y - vector2.y)
    }

    public static addition(vector1: Vector2, vector2: Vector2) {
        return new Vector2(vector1.x + vector2.x, vector1.y + vector2.y)
    }
}

export class RVOMath {
    public static readonly RVO_EPSILON = 0.00001
    public static readonly RVO_POSITIVEINFINITY = 10000000000000

    public static abs(vector: Vector2) {
        return this.sqrt(this.absSq(vector))
    }

    public static absSq(vector: Vector2) {
        return Vector2.multiply(vector, vector)
    }

    public static normalize(vector: Vector2) {
        return Vector2.division(vector, this.abs(vector))
    }

    public static det(vector1: Vector2, vector2: Vector2) {
        return vector1.x * vector2.y - vector1.y * vector2.x
    }

    public static distSqPointLineSegment(vector1: Vector2, vector2: Vector2, vector3: Vector2) {
        let r =
            Vector2.multiply(Vector2.subtract(vector3, vector1), Vector2.subtract(vector2, vector1)) /
            this.absSq(Vector2.subtract(vector2, vector1))
        if (r < 0) {
            return this.absSq(Vector2.subtract(vector3, vector1))
        }
        if (r > 1) {
            return this.absSq(Vector2.subtract(vector3, vector2))
        }
        return this.absSq(
            Vector2.subtract(
                vector3,
                Vector2.addition(vector1, Vector2.multiply2(r, Vector2.subtract(vector2, vector1))),
            ),
        )
    }

    public static fabs(scalar: number) {
        return Math.abs(scalar)
    }

    public static leftOf(a: Vector2, b: Vector2, c: Vector2) {
        return this.det(Vector2.subtract(a, c), Vector2.subtract(b, a))
    }

    public static sqr(scalar: number) {
        return scalar * scalar
    }

    public static sqrt(scalar: number) {
        return Math.sqrt(scalar)
    }

    public static transfromFloat(value: number) {
        return Math.floor(value * 10) / 10
    }
}