pragma Singleton

import QtQuick

QtObject {
    id: request

    property string baseUrl: "http://127.0.0.1:4523/m1/2914957-0-5604d062/"

    // GET
    function get(url, success, failure) {
        var xhr = new XMLHttpRequest
        xhr.open("GET", baseUrl + url)
        xhr.onreadystatechange = function () {
            handleResponse(xhr, success, failure)
        }
        xhr.send()
    }

    // POST
    function post(url, arg, success, failure) {
        var xhr = new XMLHttpRequest
        xhr.open("POST", baseUrl + url)
        xhr.setRequestHeader("Content-Length", arg.length)
        xhr.setRequestHeader(
                    "Content-Type",
                    "application/x-www-form-urlencoded;") //用POST的时候一定要有这句
        xhr.onreadystatechange = function () {
            handleResponse(xhr, success, failure)
        }
        xhr.send(arg)
    }

    // 处理返回值
    function handleResponse(xhr, success, failure) {
        if (xhr.readyState === XMLHttpRequest.DONE) {
            if (xhr.status === 200) {
                if (success !== null && success !== undefined) {
                    var result = xhr.responseText
                    try {
                        success(result, JSON.parse(result))
                    } catch (e) {
                        success(result, {})
                    }
                }
            } else {
                if (failure !== null && failure !== undefined)
                    failure(xhr.responseText, xhr.status)
            }
        }
    }
}