//================================================================
/**
 * @packageDocumentation
 * @module std.internal
 */
//================================================================
import { IForwardIterator } from "../../../iterator/IForwardIterator";

export class NativeArrayIterator<T>
    implements Readonly<IForwardIterator<T, NativeArrayIterator<T>>>
{
    private data_: Array<T>;
    private index_: number;

    /* ---------------------------------------------------------
        CONSTRUCTORS
    --------------------------------------------------------- */
    public constructor(data: Array<T>, index: number) {
        this.data_ = data;
        this.index_ = index;
    }

    /* ---------------------------------------------------------
        ACCESSORS
    --------------------------------------------------------- */
    public index(): number {
        return this.index_;
    }

    public get value(): T {
        return this.data_[this.index_];
    }

    /* ---------------------------------------------------------
        MOVERS
    --------------------------------------------------------- */
    public prev(): NativeArrayIterator<T> {
        --this.index_;
        return this;
    }

    public next(): NativeArrayIterator<T> {
        ++this.index_;
        return this;
    }

    public advance(n: number): NativeArrayIterator<T> {
        this.index_ += n;
        return this;
    }

    /* ---------------------------------------------------------
        COMPARES
    --------------------------------------------------------- */
    public equals(obj: NativeArrayIterator<T>): boolean {
        return this.data_ === obj.data_ && this.index_ === obj.index_;
    }

    public swap(obj: NativeArrayIterator<T>): void {
        [this.data_, obj.data_] = [obj.data_, this.data_];
        [this.index_, obj.index_] = [obj.index_, this.index_];
    }
}