module.exports = (api) => {
    // Default request options
    var defaults = {
        headers: {
            accept: 'application/json'
        }
    };

    // Helper for constructing url
    var url = (thing) => {
        return api + thing;
    };

    var _fetch = (thing, data, options) => {
        // Merge defaults with options
        options = Object.assign({}, defaults, options);

        // data is only allowed for POST and PUT
        if (data) {
            options.body = new FormData();

            for (var k in data) {
                options.body.set(k, data[k]);
            }
        }

        return fetch(url(thing), options);
    };

    // GET/POST/DELETE/PUT helpers
    // These helpers extend the defaults that get passed to fetch()
    return {
        get: (thing) => {
            return _fetch(thing, null, {method: 'GET'});
        },

        post: (thing, data) => {
            return _fetch(thing, data, {method: 'POST'});
        },

        put: (thing, data) => {
            return _fetch(thing, data, {method: 'PUT'});
        },

        delete: (thing, data) => {
            return _fetch(thing, data, {method: 'DELETE'});
        }
    };
};