var _curry2 = require('./internal/_curry2');
var curryN = require('./curryN');


/**
 * Accepts a function `fn` and a list of transformer functions and returns a
 * new curried function. When the new function is invoked, it calls the
 * function `fn` with parameters consisting of the result of calling each
 * supplied handler on successive arguments to the new function.
 *
 * If more arguments are passed to the returned function than transformer
 * functions, those arguments are passed directly to `fn` as additional
 * parameters. If you expect additional arguments that don't need to be
 * transformed, although you can ignore them, it's best to pass an identity
 * function so that the new function reports the correct arity.
 *
 * @func
 * @memberOf R
 * @since v0.1.0
 * @category Function
 * @sig (x1 -> x2 -> ... -> z) -> [(a -> x1), (b -> x2), ...] -> (a -> b -> ... -> z)
 * @param {Function} fn The function to wrap.
 * @param {Array} transformers A list of transformer functions
 * @return {Function} The wrapped function.
 * @see R.converge
 * @example
 *
 *      R.useWith(Math.pow, [R.identity, R.identity])(3, 4); //=> 81
 *      R.useWith(Math.pow, [R.identity, R.identity])(3)(4); //=> 81
 *      R.useWith(Math.pow, [R.dec, R.inc])(3, 4); //=> 32
 *      R.useWith(Math.pow, [R.dec, R.inc])(3)(4); //=> 32
 * @symb R.useWith(f, [g, h])(a, b) = f(g(a), h(b))
 */
module.exports = _curry2(function useWith(fn, transformers) {
  return curryN(transformers.length, function() {
    var args = [];
    var idx = 0;
    while (idx < transformers.length) {
      args.push(transformers[idx].call(this, arguments[idx]));
      idx += 1;
    }
    return fn.apply(this, args.concat(Array.prototype.slice.call(arguments, transformers.length)));
  });
});