'use strict';

var utils = require("./utils");

var normalizeHeaderName = require("./helpers/normalizeHeaderName");

var DEFAULT_CONTENT_TYPE = {
  'Content-Type': 'application/x-www-form-urlencoded'
};

function setContentTypeIfUnset(headers, value) {
  if (!utils.isUndefined(headers) && utils.isUndefined(headers['Content-Type'])) {
    headers['Content-Type'] = value;
  }
}

function getDefaultAdapter() {
  var adapter;

  if (typeof XMLHttpRequest !== 'undefined') {
    // For browsers use XHR adapter
    adapter = require("./adapters/xhr");
  } else if (typeof process !== 'undefined') {
    // For node use HTTP adapter
    adapter = require("./adapters/http");
  }

  return adapter;
}

var defaults = {
  adapter: getDefaultAdapter(),
  transformRequest: [function transformRequest(data, headers) {
    normalizeHeaderName(headers, 'Content-Type');

    if (utils.isFormData(data) || utils.isArrayBuffer(data) || utils.isBuffer(data) || utils.isStream(data) || utils.isFile(data) || utils.isBlob(data)) {
      return data;
    }

    if (utils.isArrayBufferView(data)) {
      return data.buffer;
    }

    if (utils.isURLSearchParams(data)) {
      setContentTypeIfUnset(headers, 'application/x-www-form-urlencoded;charset=utf-8');
      return data.toString();
    }

    if (utils.isObject(data)) {
      setContentTypeIfUnset(headers, 'application/json;charset=utf-8');
      return JSON.stringify(data);
    }

    return data;
  }],
  transformResponse: [function transformResponse(data) {
    /*eslint no-param-reassign:0*/
    if (typeof data === 'string') {
      try {
        data = JSON.parse(data);
      } catch (e) {
        /* Ignore */
      }
    }

    return data;
  }],
  timeout: 0,
  xsrfCookieName: 'XSRF-TOKEN',
  xsrfHeaderName: 'X-XSRF-TOKEN',
  maxContentLength: -1,
  validateStatus: function validateStatus(status) {
    return status >= 200 && status < 300;
  }
};
defaults.headers = {
  common: {
    'Accept': 'application/json, text/plain, */*'
  }
};
utils.forEach(['delete', 'get', 'head'], function forEachMethodNoData(method) {
  defaults.headers[method] = {};
});
utils.forEach(['post', 'put', 'patch'], function forEachMethodWithData(method) {
  defaults.headers[method] = utils.merge(DEFAULT_CONTENT_TYPE);
});
module.exports = defaults;