var http = require("http");
var types = require("utils/types");
var GET = "GET";
var USER_AGENT_HEADER = "User-Agent";
var USER_AGENT = "Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5355d Safari/8536.25";
var utils;
function ensureUtils() {
    if (!utils) {
        utils = require("utils/utils");
    }
}
var imageSource;
function ensureImageSource() {
    if (!imageSource) {
        imageSource = require("image-source");
    }
}
function request(options) {
    return new Promise(function (resolve, reject) {
        try {
            var sessionConfig = NSURLSessionConfiguration.defaultSessionConfiguration();
            var queue = NSOperationQueue.mainQueue();
            var session = NSURLSession.sessionWithConfigurationDelegateDelegateQueue(sessionConfig, null, queue);
            var urlRequest = NSMutableURLRequest.requestWithURL(NSURL.URLWithString(options.url));
            urlRequest.HTTPMethod = types.isDefined(options.method) ? options.method : GET;
            urlRequest.setValueForHTTPHeaderField(USER_AGENT, USER_AGENT_HEADER);
            if (options.headers) {
                for (var header in options.headers) {
                    urlRequest.setValueForHTTPHeaderField(options.headers[header] + "", header);
                }
            }
            if (types.isString(options.content) || options.content instanceof FormData) {
                urlRequest.HTTPBody = NSString.alloc().initWithString(options.content.toString()).dataUsingEncoding(4);
            }
            if (types.isNumber(options.timeout)) {
                urlRequest.timeoutInterval = options.timeout / 1000;
            }
            var dataTask = session.dataTaskWithRequestCompletionHandler(urlRequest, function (data, response, error) {
                if (error) {
                    reject(new Error(error.localizedDescription));
                }
                else {
                    var headers = {};
                    if (response && response.allHeaderFields) {
                        var headerFields = response.allHeaderFields;
                        var keys = headerFields.allKeys;
                        for (var i = 0, l = keys.count; i < l; i++) {
                            var key = keys.objectAtIndex(i);
                            var value = headerFields.valueForKey(key);
                            http.addHeader(headers, key, value);
                        }
                    }
                    resolve({
                        content: {
                            raw: data,
                            toString: function () { return NSDataToString(data); },
                            toJSON: function () {
                                ensureUtils();
                                return utils.parseJSON(NSDataToString(data));
                            },
                            toImage: function () {
                                ensureImageSource();
                                if (UIImage.imageWithData["async"]) {
                                    return UIImage.imageWithData["async"](UIImage, [data])
                                        .then(function (image) {
                                        if (!image) {
                                            throw new Error("Response content may not be converted to an Image");
                                        }
                                        var source = new imageSource.ImageSource();
                                        source.setNativeSource(image);
                                        return source;
                                    });
                                }
                                return new Promise(function (resolveImage, rejectImage) {
                                    var img = imageSource.fromData(data);
                                    if (img instanceof imageSource.ImageSource) {
                                        resolveImage(img);
                                    }
                                    else {
                                        rejectImage(new Error("Response content may not be converted to an Image"));
                                    }
                                });
                            },
                            toFile: function (destinationFilePath) {
                                var fs = require("file-system");
                                var fileName = options.url;
                                if (!destinationFilePath) {
                                    destinationFilePath = fs.path.join(fs.knownFolders.documents().path, fileName.substring(fileName.lastIndexOf('/') + 1));
                                }
                                if (data instanceof NSData) {
                                    data.writeToFileAtomically(destinationFilePath, true);
                                    return fs.File.fromPath(destinationFilePath);
                                }
                                else {
                                    reject(new Error("Cannot save file with path: " + destinationFilePath + "."));
                                }
                            }
                        },
                        statusCode: response.statusCode,
                        headers: headers
                    });
                }
            });
            dataTask.resume();
        }
        catch (ex) {
            reject(ex);
        }
    });
}
exports.request = request;
function NSDataToString(data) {
    return NSString.alloc().initWithDataEncoding(data, 4).toString();
}
