import {
    AsyncErrorCallback,
    SyncConditionTester,
    SimpleFunction
} from "../interfaces";

import {
    once
} from "../common";

/**
 * This method executes a loop body until the condition function returns false.
 */
export function whileIf<E>(
    condition: SyncConditionTester,
    loopBody: SimpleFunction<E>,
    final?: AsyncErrorCallback<E>
): void {

    let loop = function(): void {

        if (condition()) {

            loopBody(once(function(err?: E): void {

                if (err !== null && err !== undefined) {

                    final && final(err);
                }
                else {

                    loop();
                }
            }));
        }
        else {

            final && final();
        }
    };

    loop();
}