type QueryParams = Record<string, string | { toString(): string }>;

export type APICallResult<T extends object> = Response & { json: () => Promise<T> };

export async function apiCall<K extends object>(
	method: "GET",
	api: string,
	params?: QueryParams
): Promise<APICallResult<K>>;
export async function apiCall<K extends object>(
	method: "POST" | "PATCH",
	api: string,
	params?: QueryParams,
	body?: object
): Promise<APICallResult<K>>;
export async function apiCall<K extends object>(
	method: "DELETE",
	api: string,
	params?: QueryParams,
	body?: object
): Promise<APICallResult<K>>;
export async function apiCall<K extends object>(
	method: "GET" | "POST" | "PATCH" | "DELETE",
	api: string,
	params?: QueryParams,
	body?: object
): Promise<APICallResult<K>> {
	let url = window.origin + "/api/" + api;

	if (params) {
		const urlsearchparams = new URLSearchParams(
			Object.fromEntries(
				Object.entries(params).map(([key, value]): [string, string] => {
					if (typeof value !== "string") {
						return [key, value.toString()];
					} else {
						return [key, value];
					}
				})
			)
		);

		url += "?" + urlsearchparams.toString();
	}

	const response = await fetch(url, {
		headers: {
			"Content-Type": "application/json; charset=UTF-8"
		},
		credentials: "include",
		method,
		body: body !== undefined ? JSON.stringify(body) : undefined
	});

	return response;
}