/**
 * Default headers to apply to every query
 */
const defaultHeaders = {
    "Content-Type": "application/json",
    "X-Requested-With": "XMLHttpRequest",
    "X-CSRF-TOKEN": document
        .querySelector('meta[name="csrf-token"]')
        .getAttribute("content")
};

export default {
    /**
     * Send a request and return resulting JSON
     */
    async send(url, params, method = "POST", upload = false) {
        let headers = defaultHeaders;

        if (upload) {
            headers["Content-Type"] = "multipart/form-data";
        }

        let options = {
            method: method,
            headers: headers
        };

        if (params) {
            if (upload) {
                options.body = params;
            } else if (method === "GET") {
                // Build the query string
                var query = Object.keys(params)
                    .map(
                        k => {
                            let key = encodeURIComponent(k);
                            let val = params[k];

                            if (val.constructor === Array) {
                                let arr = [];

                                val.forEach((v => {
                                    arr.push(key + "[]=" + encodeURIComponent(v));
                                }));

                                return arr.join('&');
                            } else {
                                return key + "=" + encodeURIComponent(val);
                            }
                        }
                    )
                    .join("&");

                url = url + "?" + query;
            } else {
                options.body = JSON.stringify(params);
            }
        }

        const response = await fetch(url, options);

        try {
            const json = await response.json();

            return json;
        } catch {
            return response;
        }
    },

    /**
     * Send a GET request and return resulting JSON
     */
    async get(url, params) {
        return this.send(url, params, "GET");
    },

    /**
     * Send a POST request and return resulting JSON
     */
    async post(url, params, upload = false) {
        return this.send(url, params, "POST", upload);
    },

    /**
     * Send a PUT request and return resulting JSON
     */
    async put(url, params) {
        return this.send(url, params, "PUT");
    },

    /**
     * Send a DELETE request and return resulting JSON
     */
    async delete(url, params) {
        return this.send(url, params, "DELETE");
    }
};