// @ts-ignore
import BottleneckLight from "bottleneck/light";
import { VERSION } from "./version";
import { wrapRequest } from "./wrap-request";
import triggersNotificationPaths from "./generated/triggers-notification-paths";
import { routeMatcher } from "./route-matcher";
// Workaround to allow tests to directly access the triggersNotification function.
const regex = routeMatcher(triggersNotificationPaths);
const triggersNotification = regex.test.bind(regex);
const groups = {};
// @ts-ignore
const createGroups = function (Bottleneck, common) {
    // @ts-ignore
    groups.global = new Bottleneck.Group({
        id: "octokit-global",
        maxConcurrent: 10,
        ...common,
    });
    // @ts-ignore
    groups.search = new Bottleneck.Group({
        id: "octokit-search",
        maxConcurrent: 1,
        minTime: 2000,
        ...common,
    });
    // @ts-ignore
    groups.write = new Bottleneck.Group({
        id: "octokit-write",
        maxConcurrent: 1,
        minTime: 1000,
        ...common,
    });
    // @ts-ignore
    groups.notifications = new Bottleneck.Group({
        id: "octokit-notifications",
        maxConcurrent: 1,
        minTime: 3000,
        ...common,
    });
};
export function throttling(octokit, octokitOptions = {}) {
    const { enabled = true, Bottleneck = BottleneckLight, id = "no-id", timeout = 1000 * 60 * 2, // Redis TTL: 2 minutes
    connection, } = octokitOptions.throttle || {};
    if (!enabled) {
        return;
    }
    const common = { connection, timeout };
    // @ts-ignore
    if (groups.global == null) {
        createGroups(Bottleneck, common);
    }
    const state = Object.assign({
        clustering: connection != null,
        triggersNotification,
        minimumAbuseRetryAfter: 5,
        retryAfterBaseValue: 1000,
        retryLimiter: new Bottleneck(),
        id,
        ...groups,
    }, 
    // @ts-ignore
    octokitOptions.throttle);
    if (typeof state.onAbuseLimit !== "function" ||
        typeof state.onRateLimit !== "function") {
        throw new Error(`octokit/plugin-throttling error:
        You must pass the onAbuseLimit and onRateLimit error handlers.
        See https://github.com/octokit/rest.js#throttling

        const octokit = new Octokit({
          throttle: {
            onAbuseLimit: (retryAfter, options) => {/* ... */},
            onRateLimit: (retryAfter, options) => {/* ... */}
          }
        })
    `);
    }
    const events = {};
    const emitter = new Bottleneck.Events(events);
    // @ts-ignore
    events.on("abuse-limit", state.onAbuseLimit);
    // @ts-ignore
    events.on("rate-limit", state.onRateLimit);
    // @ts-ignore
    events.on("error", (e) => console.warn("Error in throttling-plugin limit handler", e));
    // @ts-ignore
    state.retryLimiter.on("failed", async function (error, info) {
        const options = info.args[info.args.length - 1];
        const isGraphQL = options.url.startsWith("/graphql");
        if (!(isGraphQL || error.status === 403)) {
            return;
        }
        const retryCount = ~~options.request.retryCount;
        options.request.retryCount = retryCount;
        const { wantRetry, retryAfter } = await (async function () {
            if (/\babuse\b/i.test(error.message)) {
                // The user has hit the abuse rate limit. (REST only)
                // https://developer.github.com/v3/#abuse-rate-limits
                // The Retry-After header can sometimes be blank when hitting an abuse limit,
                // but is always present after 2-3s, so make sure to set `retryAfter` to at least 5s by default.
                const retryAfter = Math.max(~~error.headers["retry-after"], state.minimumAbuseRetryAfter);
                const wantRetry = await emitter.trigger("abuse-limit", retryAfter, options);
                return { wantRetry, retryAfter };
            }
            if (error.headers != null &&
                error.headers["x-ratelimit-remaining"] === "0") {
                // The user has used all their allowed calls for the current time period (REST and GraphQL)
                // https://developer.github.com/v3/#rate-limiting
                const rateLimitReset = new Date(~~error.headers["x-ratelimit-reset"] * 1000).getTime();
                const retryAfter = Math.max(Math.ceil((rateLimitReset - Date.now()) / 1000), 0);
                const wantRetry = await emitter.trigger("rate-limit", retryAfter, options);
                return { wantRetry, retryAfter };
            }
            return {};
        })();
        if (wantRetry) {
            options.request.retryCount++;
            // @ts-ignore
            return retryAfter * state.retryAfterBaseValue;
        }
    });
    octokit.hook.wrap("request", wrapRequest.bind(null, state));
}
throttling.VERSION = VERSION;
throttling.triggersNotification = triggersNotification;