class Http {

    constructor() {
        this.xhr = new XMLHttpRequest();
    }

    get(params) {
        return new Promise((success, error) => {
            var par = ""
            for (const key in params.data) {
                par += `&${key}=${params.data[key]}`
            }
            par = par.replace("&", "?")
            this.xhr.open("GET", `${config.switchStage()}${params.url}${par}`)
            this.xhr.send()

            this.ReadyState(success, error)
        })
    }

    post(params) {
        return new Promise((success, error) => {
            this.xhr.open("POST", `${params.url}`)
            this.xhr.setRequestHeader('Content-Type', 'application/json');
            this.xhr.send(JSON.stringify(params.data))
            this.ReadyState(success, error)
        })
    }


    ReadyState(success, error) {
        this.xhr.onreadystatechange = () => {
            if (this.xhr.readyState == 4) {
                if (this.xhr.status == 200) {
                    var data = JSON.parse(this.xhr.response);
                    switch (data.status) {
                        case 200:
                            success(data.result)
                            break;

                        case 404:
                            alert(data.msg);
                            throw new Error(data.msg)
                            break;

                        default:
                            break;
                    }
                    
                } else {
                    error(this.xhr)
                }
            }
        }
    }
}