export function getEnvironmentProxy(): string | undefined {
    return Deno.env.get("ALL_PROXY") || Deno.env.get("HTTPS_PROXY") ||
        Deno.env.get("HTTP_PROXY");
}

export function getFetchAutoProxyInit(): RequestInit | undefined {
    const environmentProxy = getEnvironmentProxy();
    if (environmentProxy) {
        return {
            client: Deno.createHttpClient({
                proxy: {
                    url: environmentProxy,
                },
            }),
        } as RequestInit;
    }
    return undefined;
}

export async function fetchWithTimoutAndAutoProxy(
    input: URL | Request | string,
    timeout?: number,
    initCallback?: (init: RequestInit) => RequestInit,
): Promise<Response> {
    const fetchTimeout = timeout || 10000;
    const abortController = new AbortController();
    const timoutHandler = setTimeout(() => {
        abortController.abort(`Timout ${fetchTimeout} ms`);
    }, fetchTimeout);
    let init = getFetchAutoProxyInit() || {};
    init.signal = abortController.signal;
    if (initCallback) {
        init = initCallback(init);
    }
    const response = await fetch(input, init);
    clearTimeout(timoutHandler);
    return response;
}