import { UpdatedRecorder } from "./UpdatedRecorder";

/**
 * A vector with two dimensions
 */
class Vector2D extends UpdatedRecorder implements ArrayLike<number>, Iterable<number> {

    private value0: number = 0;
    private value1: number = 0;

    readonly [n: number]: number;

    /**
     * Vector length
     */
    public get length(): number {
        return 2;
    };

    public override toString(): string {
        return `Vector2D(${this.value0},${this.value1})`;
    }

    /**
     * Enumerate this vector
     */
    public *[Symbol.iterator](): Iterator<number> {
        yield this.value0;
        yield this.value1;
    }

    /**
     * The first component of this vector
     */
    public get [0](): number {
        return this.value0;
    }

    public set [0](newValue: number) {
        if (!this.updateFlag && this.value0 !== newValue) {
            this.updateFlag = true;
        }
        this.value0 = newValue;
    }

    /**
     * The second component of this vector
     */
    public get [1](): number {
        return this.value1;
    }

    public set [1](newValue: number) {
        if (!this.updateFlag && this.value1 !== newValue) {
            this.updateFlag = true;
        }
        this.value1 = newValue;
    }

    /**
     * X component of the vector
     */
    public get x(): number {
        return this.value0;
    }

    public set x(newValue: number) {
        this[0] = newValue;
    }

    /**
     * Y component of the vector
     */
    public get y(): number {
        return this.value1;
    }

    public set y(newValue: number) {
        this[1] = newValue;
    }
}

export { Vector2D };