/********************************************************************************
 *   Ledger Node JS API for ICON
 *   (c) 2016-2017 Ledger
 *
 *  Modifications (c) 2018 ICON Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 ********************************************************************************/

// TODO use bip32-path library
export function splitPath(path: string): number[] {
  const result: number[] = [];
  const components = path.split("/");
  components.forEach(element => {
    let number = parseInt(element, 10);
    if (isNaN(number)) {
      return; // FIXME shouldn't it throws instead?
    }
    if (element.length > 1 && element[element.length - 1] === "'") {
      number += 0x80000000;
    }
    result.push(number);
  });
  return result;
}

export function foreach<T, A>(arr: T[], callback: (T, number) => Promise<A>): Promise<A[]> {
  function iterate(index, array, result) {
    if (index >= array.length) {
      return result;
    } else
      return callback(array[index], index).then(function (res) {
        result.push(res);
        return iterate(index + 1, array, result);
      });
  }
  return Promise.resolve().then(() => iterate(0, arr, []));
}

export function hexToBase64(hexString: string) {
  return btoa(
    (hexString.match(/\w{2}/g) || [])
      .map(function (a) {
        return String.fromCharCode(parseInt(a, 16));
      })
      .join(""),
  );
}