import { Option, Some, None, none } from "optionals";

export function catcher<T>(f: () => T): Option<T> {
    try {
        return Some(f());
    } catch {
        // There is no need to define what is already undefined.
        return None();
    }
}

export async function catcher_async<T>(
    f: () => Promise<T>
): Promise<Option<T>> {
    try {
        return Some(await f());
    } catch {
        return None();
    }
}

export function squish_option<T>(opt: Option<Option<T>>): Option<T> {
    return opt.unwrapOr(None());
}

export function json_response(obj: any, options?: ResponseInit): Response {
    return new Response(JSON.stringify(obj), {
        ...options,
        headers: { "Content-Type": "application/json" },
    });
}

export function fetch_json(
    input: RequestInfo | URL,
    init?: RequestInit
): Promise<Option<any>> {
    return catcher_async(() => fetch(input, init).then(j => j.json()));
}

export function class_list(...classes: Array<string | undefined>): string {
    return classes.filter(Boolean).join(" ");
}

export function remove_undefined_keys(obj: any): any {
    return Object.keys(obj).reduce((acc, key) => {
        if (obj[key] !== undefined && obj[key] !== "") {
            acc[key] = obj[key];
        }
        return acc;
    }, {});
}

export const URL = "http://fl.pyrope.net";