// 用js的function 来模拟class
const http = () => {
    NProgress.configure({
        easing: 'ease', speed: 200,
        trickleSpeed: 150
    });

    const init = () => {
        return new XMLHttpRequest();
    }

    const get = (params) => {
        let http = init()
        NProgress.start();
        return new Promise((success, error) => {
            http.open("get", handleGetParams(params))
            http.send()
            readystatechange(http, success, error)
        })
    }

    const post = (params) => {
        let http = init()
        NProgress.start();
        return new Promise((success, error) => {
            http.open("post", config.checkStage() + params.url)
            http.setRequestHeader("Content-Type", "application/json")
            http.send(JSON.stringify(params.data))
            readystatechange(http, success, error)
        })
    }

    const readystatechange = (ajax, success, error) => {
        ajax.onreadystatechange = () => {
            // http status
            // ajax readyState
            // 接口提供的 标识当前你访问的接口操作的 具体信息
            if (ajax.readyState == 4) {
                if (ajax.status == 200) {
                    NProgress.done();
                    let result = JSON.parse(ajax.responseText)

                    switch (result.status) {
                        case 200:
                            success(result.data)
                            break;

                        case 500:
                            alert(result.message)
                            break;

                        default:
                            break;
                    }

                } else {
                    error(ajax)
                    console.error(ajax)
                }
            }
        }
    }


    // 处理get请求参数并 拼接地址
    const handleGetParams = (params) => {
        let str = ""
        for (const key in params.data) {
            str += `&${key}=${params.data[key]}`
        }
        str = str.replace("&", "?")
        return config.checkStage() + params.url + str
    }


    return { get, post }
}