import { sys, _decorator } from 'cc';


export class WebRequest {
    private _callBack: Function = null;
    private contentType=""

    public setContentType(str="application/x-www-form-urlencoded"){
        this.contentType=str
    }

    public getData(url: string, data: any, callback: Function, post: boolean) {
        this._callBack = callback;
        var self = this;

        var xhr = new XMLHttpRequest() //loader.getXMLHttpRequest();
        // Simple events
        let arr=['loadstart', 'abort', 'error', 'load', 'loadend', 'timeout']
        arr.forEach(function (eventname) {
            xhr["on" + eventname] = function () {
                //log("WebRequest.getData event = " + eventname);
                if (eventname == 'abort' || eventname == 'error' || eventname == 'timeout') {
                    if (self._callBack != null) {
                        self._callBack(false, "");
                    }
                }
            };
        });

        // Special event
        xhr.onreadystatechange = function () {
            //log("onreadystatechange code = " + xhr.readyState + ",status = " + xhr.status);
            if (xhr.readyState === 4 && (xhr.status >= 200 && xhr.status < 300)) {
                if (self._callBack != null) {
                    // var XmlToJson = require('XmlToJson');
                    // var xmlToJson = new  XmlToJson();
                    // var jsonData = JSON.stringify(xmlToJson.parse(xhr.responseText));
                    self._callBack(true, xhr.response);
                }
            }
        };
        xhr.timeout = 5000;//5 seconds for timeout
        if (post == null || post == false) {
            if (data == "" || data == null) {
                xhr.open("GET", url, true);
            }
            else {
                xhr.open("GET", url + "?" + data, true);
            }

            if (sys.isNative) {
                xhr.setRequestHeader("Accept-Encoding", "gzip,deflate");
            }
            xhr.send();
        }
        else {
            //log("open url = " + url + ",data = "+ data);
            xhr.open("POST", url, true);
            //set Content-type "text/plain" to post ArrayBuffer or ArrayBufferView
            // xhr.setRequestHeader("Content-Type","text/plain");
            if(this.contentType){
                xhr.setRequestHeader("Content-Type", this.contentType);
            }
            // Uint8Array is an ArrayBufferView
            //xhr.send(new Uint8Array([1,2,3,4,5]));
            xhr.send(data);
        }
    }

    
}