(function (webapi, $) {
    function safeAjax(ajaxOptions) {
        var deferredAjax = $.Deferred();

        shell.getTokenDeferred().done(function (token) {
            // add headers for AJAX
            if (!ajaxOptions.headers) {
                $.extend(ajaxOptions, {
                    headers: {
                        "__RequestVerificationToken": token
                    }
                });
            } else {
                ajaxOptions.headers["__RequestVerificationToken"] = token;
            }
            $.ajax(ajaxOptions)
                .done(function (data, textStatus, jqXHR) {
                    validateLoginSession(data, textStatus, jqXHR, deferredAjax.resolve);
                }).fail(deferredAjax.reject); //AJAX
        }).fail(function () {
            deferredAjax.rejectWith(this, arguments); // on token failure pass the token AJAX and args
        });

        return deferredAjax.promise();
    }
    webapi.safeAjax = safeAjax;
})(window.webapi = window.webapi || {}, jQuery)

const apiService = (() => {
    const fetchData = (endpoint, method = 'GET', data = {}) => {
        return webapi.safeAjax({
            type: method,
            url: `/_api/${endpoint}`,
            contentType: "application/json",
            data: method === 'POST' || method === 'PATCH' ? JSON.stringify(data) : data

        });
    };
    return {
        getItems: (tableName) => fetchData(tableName),
        getItemById: (tableName, itemId) => fetchData(tableName + "(" + itemId + ")"),
        postItem: (tableName, itemData) => fetchData(tableName, 'POST', itemData),
        updateItem: (tableName, itemId, itemData) => fetchData(tableName + "(" + itemId + ")", "PATCH", itemData),
        deleteItem: (tableName, itemId) => fetchData(tableName + "(" + itemId + ")", "DELETE")
    };
})();