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

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


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

    let loop = function(): void {

        condition(once(function(result: boolean): void {

            if (result) {

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

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

                        final && final(err);
                    }
                    else {

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

                final && final();
            }
        }));

    };

    loop();
}