// Fetch function for applet use case.
async function jfetch(url, method, obj={}) {
    let request = {
        headers: {
            "Content-Type": "application/json",
            "Authorization": `Bearer ${window.localStorage.getItem("token")}`,
        },
        method: method,
    };

    if (!isEmpty(obj)) request["body"] = JSON.stringify(obj);

    return fetch(url, request)
    .then((response) => {
        let contentType = response.headers.get("Content-Type");
        let json;
        if (contentType && contentType.indexOf("application/json" !== -1)) {
            json = response.json();
        } else { // Reprocess non-json into json.
            json = response.text().then((text) => {
                return { status: response.status, "message": text };
            });
        }
        if (!response.ok) { throw json; }
        return json;
    });
}

// OAUTH //

async function getToken() {
    let response;
    if (G_QUERY.code) {
        response = await jfetch("/api/token", "POST", { code: G_QUERY.code });
    } else {
        response = await jfetch("/api/token", "PATCH", { code: window.localStorage.getItem("refresh_token") });
    }

    window.localStorage.setItem("token", response.access_token);
    window.localStorage.setItem("token_expiry", (Date.now() + response.expires_in*1000).toString());
    window.localStorage.setItem("refresh_token", response.refresh_token);
    document.cookie = `token=${response.access_token}`;
}

async function tryRefresh() {
    if (Date.now() < parseInt(window.localStorage.getItem("token_expiry"))) return; // Not expired.
    await getToken().catch((err) => {
        let json = err.json();
        if (json.status == 401 && json.code === 0) { // Could not refresh, so refresh token expired.
            window.localStorage.clear();
            alert(`Could not get new session, did you remove access from Gitea?`);
            window.location = "/";
        } else {
            throw json;
        }
    });
}