import BottleneckLight from 'bottleneck/light';

const VERSION = "3.2.1";

const noop = () => Promise.resolve();
// @ts-ignore
function wrapRequest(state, request, options) {
    return state.retryLimiter.schedule(doRequest, state, request, options);
}
// @ts-ignore
async function doRequest(state, request, options) {
    const isWrite = options.method !== "GET" && options.method !== "HEAD";
    const isSearch = options.method === "GET" && options.url.startsWith("/search/");
    const isGraphQL = options.url.startsWith("/graphql");
    const retryCount = ~~options.request.retryCount;
    const jobOptions = retryCount > 0 ? { priority: 0, weight: 0 } : {};
    if (state.clustering) {
        // Remove a job from Redis if it has not completed or failed within 60s
        // Examples: Node process terminated, client disconnected, etc.
        // @ts-ignore
        jobOptions.expiration = 1000 * 60;
    }
    // Guarantee at least 1000ms between writes
    // GraphQL can also trigger writes
    if (isWrite || isGraphQL) {
        await state.write.key(state.id).schedule(jobOptions, noop);
    }
    // Guarantee at least 3000ms between requests that trigger notifications
    if (isWrite && state.triggersNotification(options.url)) {
        await state.notifications.key(state.id).schedule(jobOptions, noop);
    }
    // Guarantee at least 2000ms between search requests
    if (isSearch) {
        await state.search.key(state.id).schedule(jobOptions, noop);
    }
    const req = state.global.key(state.id).schedule(jobOptions, request, options);
    if (isGraphQL) {
        const res = await req;
        if (res.data.errors != null &&
            // @ts-ignore
            res.data.errors.some((error) => error.type === "RATE_LIMITED")) {
            const error = Object.assign(new Error("GraphQL Rate Limit Exceeded"), {
                headers: res.headers,
                data: res.data,
            });
            throw error;
        }
    }
    return req;
}

var triggersNotificationPaths = [
    "/orgs/:org/invitations",
    "/orgs/:org/teams/:team_slug/discussions",
    "/orgs/:org/teams/:team_slug/discussions/:discussion_number/comments",
    "/repos/:owner/:repo/collaborators/:username",
    "/repos/:owner/:repo/commits/:commit_sha/comments",
    "/repos/:owner/:repo/issues",
    "/repos/:owner/:repo/issues/:issue_number/comments",
    "/repos/:owner/:repo/pulls",
    "/repos/:owner/:repo/pulls/:pull_number/comments",
    "/repos/:owner/:repo/pulls/:pull_number/comments/:comment_id/replies",
    "/repos/:owner/:repo/pulls/:pull_number/merge",
    "/repos/:owner/:repo/pulls/:pull_number/requested_reviewers",
    "/repos/:owner/:repo/pulls/:pull_number/reviews",
    "/repos/:owner/:repo/releases",
    "/teams/:team_id/discussions",
    "/teams/:team_id/discussions/:discussion_number/comments",
];

// @ts-ignore
function routeMatcher(paths) {
    // EXAMPLE. For the following paths:
    /* [
        "/orgs/:org/invitations",
        "/repos/:owner/:repo/collaborators/:username"
    ] */
    // @ts-ignore
    const regexes = paths.map((path) => path
        .split("/")
        // @ts-ignore
        .map((c) => (c.startsWith(":") ? "(?:.+?)" : c))
        .join("/"));
    // 'regexes' would contain:
    /* [
        '/orgs/(?:.+?)/invitations',
        '/repos/(?:.+?)/(?:.+?)/collaborators/(?:.+?)'
    ] */
    // @ts-ignore
    const regex = `^(?:${regexes.map((r) => `(?:${r})`).join("|")})[^/]*$`;
    // 'regex' would contain:
    /*
      ^(?:(?:\/orgs\/(?:.+?)\/invitations)|(?:\/repos\/(?:.+?)\/(?:.+?)\/collaborators\/(?:.+?)))[^\/]*$
  
      It may look scary, but paste it into https://www.debuggex.com/
      and it will make a lot more sense!
    */
    return new RegExp(regex, "i");
}

// @ts-ignore
// 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,
    });
};
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;

export { throttling };
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