const baseUrl = 'https://baas.kinvey.com';
const appKey = 'kid_SkL8nMb6B';
const appSecret = 'd9666c510fc045faae5184ca8f412a72';

function createAuthorization(type) {
    return type === 'Basic' ?
        `Basic ${btoa(`${appKey}:${appSecret}`)}` :
        `Kinvey ${sessionStorage.getItem('authtoken')}`;
}

function createHeader(type,httpMethod, data,) {
    const headers = {
        method: httpMethod,
        headers: {
            'Authorization': createAuthorization(type),
            'Content-Type': 'application/json'
        }
    };
    if (httpMethod === "POST" || httpMethod === "PUT") {
        headers.body = JSON.stringify(data);
    }
    return headers;
}
function handleError(e) {
    if (!e.ok) {
        throw new Error(e.statusText);
    }
    return e;
}

function deserializeData(x) {
    if(x.status === 204){
        return x;
    }
    return x.json();
}

function baseFetch(module, endpoint, headers) {
    const url = `${baseUrl}/${module}/${appKey}/${endpoint}`;

    return fetch(url, headers)
        .then(handleError)
        .then(deserializeData);
}

function get(module, endpoint,type) {
    return baseFetch(module, endpoint, createHeader(type,'get'));
}

function post(module, endpoint, data,type) {
    return baseFetch(module, endpoint, createHeader(type,'post', data));
}

function put(module, endpoint, data,type) {
    return baseFetch(module, endpoint, createHeader(type,'put', data));
}

function remove(module, endpoint,type) {
    return baseFetch(module, endpoint, createHeader(type,'delete'));
}

export {get, post, put, remove};