"use strict";

/**
 * Root reference for iframes.
 */

let root;
if (typeof window !== 'undefined') {
  // Browser window
  root = window;
} else if (typeof self === 'undefined') {
  // Other environments
  console.warn('Using browser-only version of superagent in non-browser environment');
  root = void 0;
} else {
  // Web Worker
  root = self;
}
const Emitter = require('component-emitter');
const safeStringify = require('fast-safe-stringify');
const qs = require('qs');
const RequestBase = require('./request-base');
const {
  isObject,
  mixin,
  hasOwn
} = require('./utils');
const ResponseBase = require('./response-base');
const Agent = require('./agent-base');

/**
 * Noop.
 */

function noop() {}

/**
 * Expose `request`.
 */

module.exports = function (method, url) {
  // callback
  if (typeof url === 'function') {
    return new exports.Request('GET', method).end(url);
  }

  // url first
  if (arguments.length === 1) {
    return new exports.Request('GET', method);
  }
  return new exports.Request(method, url);
};
exports = module.exports;
const request = exports;
exports.Request = Request;

/**
 * Determine XHR.
 */

request.getXHR = () => {
  if (root.XMLHttpRequest) {
    return new root.XMLHttpRequest();
  }
  throw new Error('Browser-only version of superagent could not find XHR');
};

/**
 * Removes leading and trailing whitespace, added to support IE.
 *
 * @param {String} s
 * @return {String}
 * @api private
 */

const trim = ''.trim ? s => s.trim() : s => s.replace(/(^\s*|\s*$)/g, '');

/**
 * Serialize the given `obj`.
 *
 * @param {Object} obj
 * @return {String}
 * @api private
 */

function serialize(object) {
  if (!isObject(object)) return object;
  const pairs = [];
  for (const key in object) {
    if (hasOwn(object, key)) pushEncodedKeyValuePair(pairs, key, object[key]);
  }
  return pairs.join('&');
}

/**
 * Helps 'serialize' with serializing arrays.
 * Mutates the pairs array.
 *
 * @param {Array} pairs
 * @param {String} key
 * @param {Mixed} val
 */

function pushEncodedKeyValuePair(pairs, key, value) {
  if (value === undefined) return;
  if (value === null) {
    pairs.push(encodeURI(key));
    return;
  }
  if (Array.isArray(value)) {
    for (const v of value) {
      pushEncodedKeyValuePair(pairs, key, v);
    }
  } else if (isObject(value)) {
    for (const subkey in value) {
      if (hasOwn(value, subkey)) pushEncodedKeyValuePair(pairs, `${key}[${subkey}]`, value[subkey]);
    }
  } else {
    pairs.push(encodeURI(key) + '=' + encodeURIComponent(value));
  }
}

/**
 * Expose serialization method.
 */

request.serializeObject = serialize;

/**
 * Parse the given x-www-form-urlencoded `str`.
 *
 * @param {String} str
 * @return {Object}
 * @api private
 */

function parseString(string_) {
  const object = {};
  const pairs = string_.split('&');
  let pair;
  let pos;
  for (let i = 0, length_ = pairs.length; i < length_; ++i) {
    pair = pairs[i];
    pos = pair.indexOf('=');
    if (pos === -1) {
      object[decodeURIComponent(pair)] = '';
    } else {
      object[decodeURIComponent(pair.slice(0, pos))] = decodeURIComponent(pair.slice(pos + 1));
    }
  }
  return object;
}

/**
 * Expose parser.
 */

request.parseString = parseString;

/**
 * Default MIME type map.
 *
 *     superagent.types.xml = 'application/xml';
 *
 */

request.types = {
  html: 'text/html',
  json: 'application/json',
  xml: 'text/xml',
  urlencoded: 'application/x-www-form-urlencoded',
  form: 'application/x-www-form-urlencoded',
  'form-data': 'application/x-www-form-urlencoded'
};

/**
 * Default serialization map.
 *
 *     superagent.serialize['application/xml'] = function(obj){
 *       return 'generated xml here';
 *     };
 *
 */

request.serialize = {
  'application/x-www-form-urlencoded': obj => {
    return qs.stringify(obj, {
      indices: false,
      strictNullHandling: true
    });
  },
  'application/json': safeStringify
};

/**
 * Default parsers.
 *
 *     superagent.parse['application/xml'] = function(str){
 *       return { object parsed from str };
 *     };
 *
 */

request.parse = {
  'application/x-www-form-urlencoded': parseString,
  'application/json': JSON.parse
};

/**
 * Parse the given header `str` into
 * an object containing the mapped fields.
 *
 * @param {String} str
 * @return {Object}
 * @api private
 */

function parseHeader(string_) {
  const lines = string_.split(/\r?\n/);
  const fields = {};
  let index;
  let line;
  let field;
  let value;
  for (let i = 0, length_ = lines.length; i < length_; ++i) {
    line = lines[i];
    index = line.indexOf(':');
    if (index === -1) {
      // could be empty line, just skip it
      continue;
    }
    field = line.slice(0, index).toLowerCase();
    value = trim(line.slice(index + 1));
    fields[field] = value;
  }
  return fields;
}

/**
 * Check if `mime` is json or has +json structured syntax suffix.
 *
 * @param {String} mime
 * @return {Boolean}
 * @api private
 */

function isJSON(mime) {
  // should match /json or +json
  // but not /json-seq
  return /[/+]json($|[^-\w])/i.test(mime);
}

/**
 * Initialize a new `Response` with the given `xhr`.
 *
 *  - set flags (.ok, .error, etc)
 *  - parse header
 *
 * Examples:
 *
 *  Aliasing `superagent` as `request` is nice:
 *
 *      request = superagent;
 *
 *  We can use the promise-like API, or pass callbacks:
 *
 *      request.get('/').end(function(res){});
 *      request.get('/', function(res){});
 *
 *  Sending data can be chained:
 *
 *      request
 *        .post('/user')
 *        .send({ name: 'tj' })
 *        .end(function(res){});
 *
 *  Or passed to `.send()`:
 *
 *      request
 *        .post('/user')
 *        .send({ name: 'tj' }, function(res){});
 *
 *  Or passed to `.post()`:
 *
 *      request
 *        .post('/user', { name: 'tj' })
 *        .end(function(res){});
 *
 * Or further reduced to a single call for simple cases:
 *
 *      request
 *        .post('/user', { name: 'tj' }, function(res){});
 *
 * @param {XMLHTTPRequest} xhr
 * @param {Object} options
 * @api private
 */

function Response(request_) {
  this.req = request_;
  this.xhr = this.req.xhr;
  // responseText is accessible only if responseType is '' or 'text' and on older browsers
  this.text = this.req.method !== 'HEAD' && (this.xhr.responseType === '' || this.xhr.responseType === 'text') || typeof this.xhr.responseType === 'undefined' ? this.xhr.responseText : null;
  this.statusText = this.req.xhr.statusText;
  let {
    status
  } = this.xhr;
  // handle IE9 bug: http://stackoverflow.com/questions/10046972/msie-returns-status-code-of-1223-for-ajax-request
  if (status === 1223) {
    status = 204;
  }
  this._setStatusProperties(status);
  this.headers = parseHeader(this.xhr.getAllResponseHeaders());
  this.header = this.headers;
  // getAllResponseHeaders sometimes falsely returns "" for CORS requests, but
  // getResponseHeader still works. so we get content-type even if getting
  // other headers fails.
  this.header['content-type'] = this.xhr.getResponseHeader('content-type');
  this._setHeaderProperties(this.header);
  if (this.text === null && request_._responseType) {
    this.body = this.xhr.response;
  } else {
    this.body = this.req.method === 'HEAD' ? null : this._parseBody(this.text ? this.text : this.xhr.response);
  }
}
mixin(Response.prototype, ResponseBase.prototype);

/**
 * Parse the given body `str`.
 *
 * Used for auto-parsing of bodies. Parsers
 * are defined on the `superagent.parse` object.
 *
 * @param {String} str
 * @return {Mixed}
 * @api private
 */

Response.prototype._parseBody = function (string_) {
  let parse = request.parse[this.type];
  if (this.req._parser) {
    return this.req._parser(this, string_);
  }
  if (!parse && isJSON(this.type)) {
    parse = request.parse['application/json'];
  }
  return parse && string_ && (string_.length > 0 || string_ instanceof Object) ? parse(string_) : null;
};

/**
 * Return an `Error` representative of this response.
 *
 * @return {Error}
 * @api public
 */

Response.prototype.toError = function () {
  const {
    req
  } = this;
  const {
    method
  } = req;
  const {
    url
  } = req;
  const message = `cannot ${method} ${url} (${this.status})`;
  const error = new Error(message);
  error.status = this.status;
  error.method = method;
  error.url = url;
  return error;
};

/**
 * Expose `Response`.
 */

request.Response = Response;

/**
 * Initialize a new `Request` with the given `method` and `url`.
 *
 * @param {String} method
 * @param {String} url
 * @api public
 */

function Request(method, url) {
  const self = this;
  this._query = this._query || [];
  this.method = method;
  this.url = url;
  this.header = {}; // preserves header name case
  this._header = {}; // coerces header names to lowercase
  this.on('end', () => {
    let error = null;
    let res = null;
    try {
      res = new Response(self);
    } catch (err) {
      error = new Error('Parser is unable to parse the response');
      error.parse = true;
      error.original = err;
      // issue #675: return the raw response if the response parsing fails
      if (self.xhr) {
        // ie9 doesn't have 'response' property
        error.rawResponse = typeof self.xhr.responseType === 'undefined' ? self.xhr.responseText : self.xhr.response;
        // issue #876: return the http status code if the response parsing fails
        error.status = self.xhr.status ? self.xhr.status : null;
        error.statusCode = error.status; // backwards-compat only
      } else {
        error.rawResponse = null;
        error.status = null;
      }
      return self.callback(error);
    }
    self.emit('response', res);
    let new_error;
    try {
      if (!self._isResponseOK(res)) {
        new_error = new Error(res.statusText || res.text || 'Unsuccessful HTTP response');
      }
    } catch (err) {
      new_error = err; // ok() callback can throw
    }

    // #1000 don't catch errors from the callback to avoid double calling it
    if (new_error) {
      new_error.original = error;
      new_error.response = res;
      new_error.status = new_error.status || res.status;
      self.callback(new_error, res);
    } else {
      self.callback(null, res);
    }
  });
}

/**
 * Mixin `Emitter` and `RequestBase`.
 */

// eslint-disable-next-line new-cap
Emitter(Request.prototype);
mixin(Request.prototype, RequestBase.prototype);

/**
 * Set Content-Type to `type`, mapping values from `request.types`.
 *
 * Examples:
 *
 *      superagent.types.xml = 'application/xml';
 *
 *      request.post('/')
 *        .type('xml')
 *        .send(xmlstring)
 *        .end(callback);
 *
 *      request.post('/')
 *        .type('application/xml')
 *        .send(xmlstring)
 *        .end(callback);
 *
 * @param {String} type
 * @return {Request} for chaining
 * @api public
 */

Request.prototype.type = function (type) {
  this.set('Content-Type', request.types[type] || type);
  return this;
};

/**
 * Set Accept to `type`, mapping values from `request.types`.
 *
 * Examples:
 *
 *      superagent.types.json = 'application/json';
 *
 *      request.get('/agent')
 *        .accept('json')
 *        .end(callback);
 *
 *      request.get('/agent')
 *        .accept('application/json')
 *        .end(callback);
 *
 * @param {String} accept
 * @return {Request} for chaining
 * @api public
 */

Request.prototype.accept = function (type) {
  this.set('Accept', request.types[type] || type);
  return this;
};

/**
 * Set Authorization field value with `user` and `pass`.
 *
 * @param {String} user
 * @param {String} [pass] optional in case of using 'bearer' as type
 * @param {Object} options with 'type' property 'auto', 'basic' or 'bearer' (default 'basic')
 * @return {Request} for chaining
 * @api public
 */

Request.prototype.auth = function (user, pass, options) {
  if (arguments.length === 1) pass = '';
  if (typeof pass === 'object' && pass !== null) {
    // pass is optional and can be replaced with options
    options = pass;
    pass = '';
  }
  if (!options) {
    options = {
      type: typeof btoa === 'function' ? 'basic' : 'auto'
    };
  }
  const encoder = options.encoder ? options.encoder : string => {
    if (typeof btoa === 'function') {
      return btoa(string);
    }
    throw new Error('Cannot use basic auth, btoa is not a function');
  };
  return this._auth(user, pass, options, encoder);
};

/**
 * Add query-string `val`.
 *
 * Examples:
 *
 *   request.get('/shoes')
 *     .query('size=10')
 *     .query({ color: 'blue' })
 *
 * @param {Object|String} val
 * @return {Request} for chaining
 * @api public
 */

Request.prototype.query = function (value) {
  if (typeof value !== 'string') value = serialize(value);
  if (value) this._query.push(value);
  return this;
};

/**
 * Queue the given `file` as an attachment to the specified `field`,
 * with optional `options` (or filename).
 *
 * ``` js
 * request.post('/upload')
 *   .attach('content', new Blob(['<a id="a"><b id="b">hey!</b></a>'], { type: "text/html"}))
 *   .end(callback);
 * ```
 *
 * @param {String} field
 * @param {Blob|File} file
 * @param {String|Object} options
 * @return {Request} for chaining
 * @api public
 */

Request.prototype.attach = function (field, file, options) {
  if (file) {
    if (this._data) {
      throw new Error("superagent can't mix .send() and .attach()");
    }
    this._getFormData().append(field, file, options || file.name);
  }
  return this;
};
Request.prototype._getFormData = function () {
  if (!this._formData) {
    this._formData = new root.FormData();
  }
  return this._formData;
};

/**
 * Invoke the callback with `err` and `res`
 * and handle arity check.
 *
 * @param {Error} err
 * @param {Response} res
 * @api private
 */

Request.prototype.callback = function (error, res) {
  if (this._shouldRetry(error, res)) {
    return this._retry();
  }
  const fn = this._callback;
  this.clearTimeout();
  if (error) {
    if (this._maxRetries) error.retries = this._retries - 1;
    this.emit('error', error);
  }
  fn(error, res);
};

/**
 * Invoke callback with x-domain error.
 *
 * @api private
 */

Request.prototype.crossDomainError = function () {
  const error = new Error('Request has been terminated\nPossible causes: the network is offline, Origin is not allowed by Access-Control-Allow-Origin, the page is being unloaded, etc.');
  error.crossDomain = true;
  error.status = this.status;
  error.method = this.method;
  error.url = this.url;
  this.callback(error);
};

// This only warns, because the request is still likely to work
Request.prototype.agent = function () {
  console.warn('This is not supported in browser version of superagent');
  return this;
};
Request.prototype.ca = Request.prototype.agent;
Request.prototype.buffer = Request.prototype.ca;

// This throws, because it can't send/receive data as expected
Request.prototype.write = () => {
  throw new Error('Streaming is not supported in browser version of superagent');
};
Request.prototype.pipe = Request.prototype.write;

/**
 * Check if `obj` is a host object,
 * we don't want to serialize these :)
 *
 * @param {Object} obj host object
 * @return {Boolean} is a host object
 * @api private
 */
Request.prototype._isHost = function (object) {
  // Native objects stringify to [object File], [object Blob], [object FormData], etc.
  return object && typeof object === 'object' && !Array.isArray(object) && Object.prototype.toString.call(object) !== '[object Object]';
};

/**
 * Initiate request, invoking callback `fn(res)`
 * with an instanceof `Response`.
 *
 * @param {Function} fn
 * @return {Request} for chaining
 * @api public
 */

Request.prototype.end = function (fn) {
  if (this._endCalled) {
    console.warn('Warning: .end() was called twice. This is not supported in superagent');
  }
  this._endCalled = true;

  // store callback
  this._callback = fn || noop;

  // querystring
  this._finalizeQueryString();
  this._end();
};
Request.prototype._setUploadTimeout = function () {
  const self = this;

  // upload timeout it's wokrs only if deadline timeout is off
  if (this._uploadTimeout && !this._uploadTimeoutTimer) {
    this._uploadTimeoutTimer = setTimeout(() => {
      self._timeoutError('Upload timeout of ', self._uploadTimeout, 'ETIMEDOUT');
    }, this._uploadTimeout);
  }
};

// eslint-disable-next-line complexity
Request.prototype._end = function () {
  if (this._aborted) return this.callback(new Error('The request has been aborted even before .end() was called'));
  const self = this;
  this.xhr = request.getXHR();
  const {
    xhr
  } = this;
  let data = this._formData || this._data;
  this._setTimeouts();

  // state change
  xhr.addEventListener('readystatechange', () => {
    const {
      readyState
    } = xhr;
    if (readyState >= 2 && self._responseTimeoutTimer) {
      clearTimeout(self._responseTimeoutTimer);
    }
    if (readyState !== 4) {
      return;
    }

    // In IE9, reads to any property (e.g. status) off of an aborted XHR will
    // result in the error "Could not complete the operation due to error c00c023f"
    let status;
    try {
      status = xhr.status;
    } catch (err) {
      status = 0;
    }
    if (!status) {
      if (self.timedout || self._aborted) return;
      return self.crossDomainError();
    }
    self.emit('end');
  });

  // progress
  const handleProgress = (direction, e) => {
    if (e.total > 0) {
      e.percent = e.loaded / e.total * 100;
      if (e.percent === 100) {
        clearTimeout(self._uploadTimeoutTimer);
      }
    }
    e.direction = direction;
    self.emit('progress', e);
  };
  if (this.hasListeners('progress')) {
    try {
      xhr.addEventListener('progress', handleProgress.bind(null, 'download'));
      if (xhr.upload) {
        xhr.upload.addEventListener('progress', handleProgress.bind(null, 'upload'));
      }
    } catch (err) {
      // Accessing xhr.upload fails in IE from a web worker, so just pretend it doesn't exist.
      // Reported here:
      // https://connect.microsoft.com/IE/feedback/details/837245/xmlhttprequest-upload-throws-invalid-argument-when-used-from-web-worker-context
    }
  }
  if (xhr.upload) {
    this._setUploadTimeout();
  }

  // initiate request
  try {
    if (this.username && this.password) {
      xhr.open(this.method, this.url, true, this.username, this.password);
    } else {
      xhr.open(this.method, this.url, true);
    }
  } catch (err) {
    // see #1149
    return this.callback(err);
  }

  // CORS
  if (this._withCredentials) xhr.withCredentials = true;

  // body
  if (!this._formData && this.method !== 'GET' && this.method !== 'HEAD' && typeof data !== 'string' && !this._isHost(data)) {
    // serialize stuff
    const contentType = this._header['content-type'];
    let serialize = this._serializer || request.serialize[contentType ? contentType.split(';')[0] : ''];
    if (!serialize && isJSON(contentType)) {
      serialize = request.serialize['application/json'];
    }
    if (serialize) data = serialize(data);
  }

  // set header fields
  for (const field in this.header) {
    if (this.header[field] === null) continue;
    if (hasOwn(this.header, field)) xhr.setRequestHeader(field, this.header[field]);
  }
  if (this._responseType) {
    xhr.responseType = this._responseType;
  }

  // send stuff
  this.emit('request', this);

  // IE11 xhr.send(undefined) sends 'undefined' string as POST payload (instead of nothing)
  // We need null here if data is undefined
  xhr.send(typeof data === 'undefined' ? null : data);
};

// create a Proxy that can instantiate a new Agent without using `new` keyword
// (for backward compatibility and chaining)
const proxyAgent = new Proxy(Agent, {
  apply(target, thisArg, argumentsList) {
    return new target(...argumentsList);
  }
});
request.agent = proxyAgent;
for (const method of ['GET', 'POST', 'OPTIONS', 'PATCH', 'PUT', 'DELETE']) {
  Agent.prototype[method.toLowerCase()] = function (url, fn) {
    const request_ = new request.Request(method, url);
    this._setDefaults(request_);
    if (fn) {
      request_.end(fn);
    }
    return request_;
  };
}
Agent.prototype.del = Agent.prototype.delete;

/**
 * GET `url` with optional callback `fn(res)`.
 *
 * @param {String} url
 * @param {Mixed|Function} [data] or fn
 * @param {Function} [fn]
 * @return {Request}
 * @api public
 */

request.get = (url, data, fn) => {
  const request_ = request('GET', url);
  if (typeof data === 'function') {
    fn = data;
    data = null;
  }
  if (data) request_.query(data);
  if (fn) request_.end(fn);
  return request_;
};

/**
 * HEAD `url` with optional callback `fn(res)`.
 *
 * @param {String} url
 * @param {Mixed|Function} [data] or fn
 * @param {Function} [fn]
 * @return {Request}
 * @api public
 */

request.head = (url, data, fn) => {
  const request_ = request('HEAD', url);
  if (typeof data === 'function') {
    fn = data;
    data = null;
  }
  if (data) request_.query(data);
  if (fn) request_.end(fn);
  return request_;
};

/**
 * OPTIONS query to `url` with optional callback `fn(res)`.
 *
 * @param {String} url
 * @param {Mixed|Function} [data] or fn
 * @param {Function} [fn]
 * @return {Request}
 * @api public
 */

request.options = (url, data, fn) => {
  const request_ = request('OPTIONS', url);
  if (typeof data === 'function') {
    fn = data;
    data = null;
  }
  if (data) request_.send(data);
  if (fn) request_.end(fn);
  return request_;
};

/**
 * DELETE `url` with optional `data` and callback `fn(res)`.
 *
 * @param {String} url
 * @param {Mixed} [data]
 * @param {Function} [fn]
 * @return {Request}
 * @api public
 */

function del(url, data, fn) {
  const request_ = request('DELETE', url);
  if (typeof data === 'function') {
    fn = data;
    data = null;
  }
  if (data) request_.send(data);
  if (fn) request_.end(fn);
  return request_;
}
request.del = del;
request.delete = del;

/**
 * PATCH `url` with optional `data` and callback `fn(res)`.
 *
 * @param {String} url
 * @param {Mixed} [data]
 * @param {Function} [fn]
 * @return {Request}
 * @api public
 */

request.patch = (url, data, fn) => {
  const request_ = request('PATCH', url);
  if (typeof data === 'function') {
    fn = data;
    data = null;
  }
  if (data) request_.send(data);
  if (fn) request_.end(fn);
  return request_;
};

/**
 * POST `url` with optional `data` and callback `fn(res)`.
 *
 * @param {String} url
 * @param {Mixed} [data]
 * @param {Function} [fn]
 * @return {Request}
 * @api public
 */

request.post = (url, data, fn) => {
  const request_ = request('POST', url);
  if (typeof data === 'function') {
    fn = data;
    data = null;
  }
  if (data) request_.send(data);
  if (fn) request_.end(fn);
  return request_;
};

/**
 * PUT `url` with optional `data` and callback `fn(res)`.
 *
 * @param {String} url
 * @param {Mixed|Function} [data] or fn
 * @param {Function} [fn]
 * @return {Request}
 * @api public
 */

request.put = (url, data, fn) => {
  const request_ = request('PUT', url);
  if (typeof data === 'function') {
    fn = data;
    data = null;
  }
  if (data) request_.send(data);
  if (fn) request_.end(fn);
  return request_;
};
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