'use strict';

import utils from '../utils.js';
import AxiosURLSearchParams from '../helpers/AxiosURLSearchParams.js';

/**
 * It replaces all instances of the characters `:`, `$`, `,`, `+`, `[`, and `]` with their
 * URI encoded counterparts
 *
 * @param {string} val The value to be encoded.
 *
 * @returns {string} The encoded value.
 */
function encode(val) {
  return encodeURIComponent(val)
    .replace(/%3A/gi, ':')
    .replace(/%24/g, '$')
    .replace(/%2C/gi, ',')
    .replace(/%20/g, '+');
}

/**
 * Build a URL by appending params to the end
 *
 * @param {string} url The base of the url (e.g., http://www.google.com)
 * @param {object} [params] The params to be appended
 * @param {?(object|Function)} options
 *
 * @returns {string} The formatted url
 */
export default function buildURL(url, params, options) {
  if (!params) {
    return url;
  }

  const _encode = (options && options.encode) || encode;

  const _options = utils.isFunction(options)
    ? {
        serialize: options,
      }
    : options;

  const serializeFn = _options && _options.serialize;

  let serializedParams;

  if (serializeFn) {
    serializedParams = serializeFn(params, _options);
  } else {
    serializedParams = utils.isURLSearchParams(params)
      ? params.toString()
      : new AxiosURLSearchParams(params, _options).toString(_encode);
  }

  if (serializedParams) {
    const hashmarkIndex = url.indexOf('#');

    if (hashmarkIndex !== -1) {
      url = url.slice(0, hashmarkIndex);
    }
    url += (url.indexOf('?') === -1 ? '?' : '&') + serializedParams;
  }

  return url;
}