var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { RequestMethod, ResponseType } from '../enums';
import { Response } from '../static_response';
import { Headers } from '../headers';
import { ResponseOptions } from '../base_response_options';
import { Injectable } from 'angular2/core';
import { BrowserXhr } from './browser_xhr';
import { isPresent } from 'angular2/src/facade/lang';
import { Observable } from 'angular2/core';
import { isSuccess, getResponseURL } from '../http_utils';
/**
* Creates connections using `XMLHttpRequest`. Given a fully-qualified
* request, an `XHRConnection` will immediately create an `XMLHttpRequest` object and send the
* request.
*
* This class would typically not be created or interacted with directly inside applications, though
* the {@link MockConnection} may be interacted with in tests.
*/
export class XHRConnection {
    constructor(req, browserXHR, baseResponseOptions) {
        this.request = req;
        this.response = new Observable(responseObserver => {
            let _xhr = browserXHR.build();
            _xhr.open(RequestMethod[req.method].toUpperCase(), req.url);
            // load event handler
            let onLoad = () => {
                // responseText is the old-school way of retrieving response (supported by IE8 & 9)
                // response/responseType properties were introduced in XHR Level2 spec (supported by
                // IE10)
                let body = isPresent(_xhr.response) ? _xhr.response : _xhr.responseText;
                let headers = Headers.fromResponseHeaderString(_xhr.getAllResponseHeaders());
                let url = getResponseURL(_xhr);
                // normalize IE9 bug (http://bugs.jquery.com/ticket/1450)
                let status = _xhr.status === 1223 ? 204 : _xhr.status;
                // fix status code when it is 0 (0 status is undocumented).
                // Occurs when accessing file resources or on Android 4.1 stock browser
                // while retrieving files from application cache.
                if (status === 0) {
                    status = body ? 200 : 0;
                }
                var responseOptions = new ResponseOptions({ body, status, headers, url });
                if (isPresent(baseResponseOptions)) {
                    responseOptions = baseResponseOptions.merge(responseOptions);
                }
                let response = new Response(responseOptions);
                if (isSuccess(status)) {
                    responseObserver.next(response);
                    // TODO(gdi2290): defer complete if array buffer until done
                    responseObserver.complete();
                    return;
                }
                responseObserver.error(response);
            };
            // error event handler
            let onError = (err) => {
                var responseOptions = new ResponseOptions({ body: err, type: ResponseType.Error });
                if (isPresent(baseResponseOptions)) {
                    responseOptions = baseResponseOptions.merge(responseOptions);
                }
                responseObserver.error(new Response(responseOptions));
            };
            if (isPresent(req.headers)) {
                req.headers.forEach((values, name) => _xhr.setRequestHeader(name, values.join(',')));
            }
            _xhr.addEventListener('load', onLoad);
            _xhr.addEventListener('error', onError);
            _xhr.send(this.request.text());
            return () => {
                _xhr.removeEventListener('load', onLoad);
                _xhr.removeEventListener('error', onError);
                _xhr.abort();
            };
        });
    }
}
/**
 * Creates {@link XHRConnection} instances.
 *
 * This class would typically not be used by end users, but could be
 * overridden if a different backend implementation should be used,
 * such as in a node backend.
 *
 * ### Example
 *
 * ```
 * import {Http, MyNodeBackend, HTTP_PROVIDERS, BaseRequestOptions} from 'angular2/http';
 * @Component({
 *   viewProviders: [
 *     HTTP_PROVIDERS,
 *     provide(Http, {useFactory: (backend, options) => {
 *       return new Http(backend, options);
 *     }, deps: [MyNodeBackend, BaseRequestOptions]})]
 * })
 * class MyComponent {
 *   constructor(http:Http) {
 *     http.request('people.json').subscribe(res => this.people = res.json());
 *   }
 * }
 * ```
 *
 **/
export let XHRBackend = class {
    constructor(_browserXHR, _baseResponseOptions) {
        this._browserXHR = _browserXHR;
        this._baseResponseOptions = _baseResponseOptions;
    }
    createConnection(request) {
        return new XHRConnection(request, this._browserXHR, this._baseResponseOptions);
    }
};
XHRBackend = __decorate([
    Injectable(), 
    __metadata('design:paramtypes', [BrowserXhr, ResponseOptions])
], XHRBackend);
