// tslint:disable no-default-export

import { ByteBufferClass } from '../window.d';

let ByteBuffer: ByteBufferClass | undefined;
const arrayBuffer = new ArrayBuffer(0);
const uint8Array = new Uint8Array();

let StaticByteBufferProto: any;
// @ts-ignore
const StaticArrayBufferProto = arrayBuffer.__proto__;
// @ts-ignore
const StaticUint8ArrayProto = uint8Array.__proto__;

function getString(thing: any): string {
  // Note: we must make this at runtime because it's loaded in the browser context
  if (!ByteBuffer) {
    ByteBuffer = new window.dcodeIO.ByteBuffer();
  }

  if (!StaticByteBufferProto) {
    // @ts-ignore
    StaticByteBufferProto = ByteBuffer.__proto__;
  }

  if (thing === Object(thing)) {
    if (thing.__proto__ === StaticUint8ArrayProto) {
      return String.fromCharCode.apply(null, thing);
    }
    if (thing.__proto__ === StaticArrayBufferProto) {
      return getString(new Uint8Array(thing));
    }
    if (thing.__proto__ === StaticByteBufferProto) {
      return thing.toString('binary');
    }
  }
  return thing;
}

function getStringable(thing: any): boolean {
  return (
    typeof thing === 'string' ||
    typeof thing === 'number' ||
    typeof thing === 'boolean' ||
    (thing === Object(thing) &&
      (thing.__proto__ === StaticArrayBufferProto ||
        thing.__proto__ === StaticUint8ArrayProto ||
        thing.__proto__ === StaticByteBufferProto))
  );
}

function ensureStringed(thing: any): any {
  if (getStringable(thing)) {
    return getString(thing);
  } else if (thing instanceof Array) {
    const res = [];
    for (let i = 0; i < thing.length; i += 1) {
      res[i] = ensureStringed(thing[i]);
    }

    return res;
  } else if (thing === Object(thing)) {
    const res: any = {};
    // tslint:disable-next-line forin no-for-in no-default-export
    for (const key in thing) {
      res[key] = ensureStringed(thing[key]);
    }

    return res;
  } else if (thing === null) {
    return null;
  }
  throw new Error(`unsure of how to jsonify object of type ${typeof thing}`);
}

function stringToArrayBuffer(string: string) {
  if (typeof string !== 'string') {
    throw new TypeError("'string' must be a string");
  }

  const array = new Uint8Array(string.length);
  for (let i = 0; i < string.length; i += 1) {
    array[i] = string.charCodeAt(i);
  }
  return array.buffer;
}

// Number formatting utils
const utils = {
  getString,
  isNumberSane: (number: string) =>
    number[0] === '+' && /^[0-9]+$/.test(number.substring(1)),
  jsonThing: (thing: any) => JSON.stringify(ensureStringed(thing)),
  stringToArrayBuffer,
  unencodeNumber: (number: string) => number.split('.'),
};

export default utils;