define(['./createCtorWrapper', './root'], function(createCtorWrapper, root) {

  /** Used to compose bitmasks for wrapper metadata. */
  var BIND_FLAG = 1;

  /**
   * Creates a function that wraps `func` and invokes it with the optional `this`
   * binding of `thisArg` and the `partials` prepended to those provided to
   * the wrapper.
   *
   * @private
   * @param {Function} func The function to partially apply arguments to.
   * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
   * @param {*} thisArg The `this` binding of `func`.
   * @param {Array} partials The arguments to prepend to those provided to the new function.
   * @returns {Function} Returns the new bound function.
   */
  function createPartialWrapper(func, bitmask, thisArg, partials) {
    var isBind = bitmask & BIND_FLAG,
        Ctor = createCtorWrapper(func);

    function wrapper() {
      // Avoid `arguments` object use disqualifying optimizations by
      // converting it to an array before providing it `func`.
      var argsIndex = -1,
          argsLength = arguments.length,
          leftIndex = -1,
          leftLength = partials.length,
          args = Array(leftLength + argsLength);

      while (++leftIndex < leftLength) {
        args[leftIndex] = partials[leftIndex];
      }
      while (argsLength--) {
        args[leftIndex++] = arguments[++argsIndex];
      }
      var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
      return fn.apply(isBind ? thisArg : this, args);
    }
    return wrapper;
  }

  return createPartialWrapper;
});