'use strict';

var index = require('../platform/index.js');
var utils = require('../utils.js');
var isURLSameOrigin = require('./isURLSameOrigin.js');
var cookies = require('./cookies.js');
var buildFullPath = require('../core/buildFullPath.js');
var mergeConfig = require('../core/mergeConfig.js');
var AxiosHeaders = require('../core/AxiosHeaders.js');
var buildURL = require('./buildURL.js');

var resolveConfig = (config) => {
  const newConfig = mergeConfig({}, config);

  let {data, withXSRFToken, xsrfHeaderName, xsrfCookieName, headers, auth} = newConfig;

  newConfig.headers = headers = AxiosHeaders.from(headers);

  newConfig.url = buildURL(buildFullPath(newConfig.baseURL, newConfig.url), config.params, config.paramsSerializer);

  // HTTP basic authentication
  if (auth) {
    headers.set('Authorization', 'Basic ' +
      btoa((auth.username || '') + ':' + (auth.password ? unescape(encodeURIComponent(auth.password)) : ''))
    );
  }

  let contentType;

  if (utils.isFormData(data)) {
    if (index.hasStandardBrowserEnv || index.hasStandardBrowserWebWorkerEnv) {
      headers.setContentType(undefined); // Let the browser set it
    } else if ((contentType = headers.getContentType()) !== false) {
      // fix semicolon duplication issue for ReactNative FormData implementation
      const [type, ...tokens] = contentType ? contentType.split(';').map(token => token.trim()).filter(Boolean) : [];
      headers.setContentType([type || 'multipart/form-data', ...tokens].join('; '));
    }
  }

  // Add xsrf header
  // This is only done if running in a standard browser environment.
  // Specifically not if we're in a web worker, or react-native.

  if (index.hasStandardBrowserEnv) {
    withXSRFToken && utils.isFunction(withXSRFToken) && (withXSRFToken = withXSRFToken(newConfig));

    if (withXSRFToken || (withXSRFToken !== false && isURLSameOrigin(newConfig.url))) {
      // Add xsrf header
      const xsrfValue = xsrfHeaderName && xsrfCookieName && cookies.read(xsrfCookieName);

      if (xsrfValue) {
        headers.set(xsrfHeaderName, xsrfValue);
      }
    }
  }

  return newConfig;
};

module.exports = resolveConfig;
