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

import { IPushFront } from "../internal/container/partial/IPushFront";
import { equal_to } from "../functional/comparators";

/**
 * Front insert iterator.
 *
 * @author Jeongho Nam - https://github.com/samchon
 */
export class FrontInsertIterator<
    Source extends IPushFront<FrontInsertIterator.ValueType<Source>>,
> extends InsertIteratorBase<
    FrontInsertIterator.ValueType<Source>,
    FrontInsertIterator<Source>
> {
    private source_: Source;

    /* ---------------------------------------------------------
        METHODS
    --------------------------------------------------------- */
    /**
     * Initializer Constructor.
     *
     * @param source The source container.
     */
    public constructor(source: Source) {
        super();
        this.source_ = source;
    }

    /**
     * @inheritDoc
     */
    public set value(val: FrontInsertIterator.ValueType<Source>) {
        this.source_.push_front(val);
    }

    /**
     * @inheritDoc
     */
    public equals(obj: FrontInsertIterator<Source>): boolean {
        return equal_to(this.source_, obj.source_);
    }
}
export namespace FrontInsertIterator {
    /**
     * Deduct value type.
     */
    export type ValueType<Source extends IPushFront<any>> =
        Source extends IPushFront<infer T> ? T : unknown;
}