const VERSION = "2.17.0";

/**
 * Some “list” response that can be paginated have a different response structure
 *
 * They have a `total_count` key in the response (search also has `incomplete_results`,
 * /installation/repositories also has `repository_selection`), as well as a key with
 * the list of the items which name varies from endpoint to endpoint.
 *
 * Octokit normalizes these responses so that paginated results are always returned following
 * the same structure. One challenge is that if the list response has only one page, no Link
 * header is provided, so this header alone is not sufficient to check wether a response is
 * paginated or not.
 *
 * We check if a "total_count" key is present in the response data, but also make sure that
 * a "url" property is not, as the "Get the combined status for a specific ref" endpoint would
 * otherwise match: https://developer.github.com/v3/repos/statuses/#get-the-combined-status-for-a-specific-ref
 */
function normalizePaginatedListResponse(response) {
    // endpoints can respond with 204 if repository is empty
    if (!response.data) {
        return {
            ...response,
            data: [],
        };
    }
    const responseNeedsNormalization = "total_count" in response.data && !("url" in response.data);
    if (!responseNeedsNormalization)
        return response;
    // keep the additional properties intact as there is currently no other way
    // to retrieve the same information.
    const incompleteResults = response.data.incomplete_results;
    const repositorySelection = response.data.repository_selection;
    const totalCount = response.data.total_count;
    delete response.data.incomplete_results;
    delete response.data.repository_selection;
    delete response.data.total_count;
    const namespaceKey = Object.keys(response.data)[0];
    const data = response.data[namespaceKey];
    response.data = data;
    if (typeof incompleteResults !== "undefined") {
        response.data.incomplete_results = incompleteResults;
    }
    if (typeof repositorySelection !== "undefined") {
        response.data.repository_selection = repositorySelection;
    }
    response.data.total_count = totalCount;
    return response;
}

function iterator(octokit, route, parameters) {
    const options = typeof route === "function"
        ? route.endpoint(parameters)
        : octokit.request.endpoint(route, parameters);
    const requestMethod = typeof route === "function" ? route : octokit.request;
    const method = options.method;
    const headers = options.headers;
    let url = options.url;
    return {
        [Symbol.asyncIterator]: () => ({
            async next() {
                if (!url)
                    return { done: true };
                try {
                    const response = await requestMethod({ method, url, headers });
                    const normalizedResponse = normalizePaginatedListResponse(response);
                    // `response.headers.link` format:
                    // '<https://api.github.com/users/aseemk/followers?page=2>; rel="next", <https://api.github.com/users/aseemk/followers?page=2>; rel="last"'
                    // sets `url` to undefined if "next" URL is not present or `link` header is not set
                    url = ((normalizedResponse.headers.link || "").match(/<([^>]+)>;\s*rel="next"/) || [])[1];
                    return { value: normalizedResponse };
                }
                catch (error) {
                    if (error.status !== 409)
                        throw error;
                    url = "";
                    return {
                        value: {
                            status: 200,
                            headers: {},
                            data: [],
                        },
                    };
                }
            },
        }),
    };
}

function paginate(octokit, route, parameters, mapFn) {
    if (typeof parameters === "function") {
        mapFn = parameters;
        parameters = undefined;
    }
    return gather(octokit, [], iterator(octokit, route, parameters)[Symbol.asyncIterator](), mapFn);
}
function gather(octokit, results, iterator, mapFn) {
    return iterator.next().then((result) => {
        if (result.done) {
            return results;
        }
        let earlyExit = false;
        function done() {
            earlyExit = true;
        }
        results = results.concat(mapFn ? mapFn(result.value, done) : result.value.data);
        if (earlyExit) {
            return results;
        }
        return gather(octokit, results, iterator, mapFn);
    });
}

const composePaginateRest = Object.assign(paginate, {
    iterator,
});

const paginatingEndpoints = [
    "GET /app/hook/deliveries",
    "GET /app/installations",
    "GET /applications/grants",
    "GET /authorizations",
    "GET /enterprises/{enterprise}/actions/permissions/organizations",
    "GET /enterprises/{enterprise}/actions/runner-groups",
    "GET /enterprises/{enterprise}/actions/runner-groups/{runner_group_id}/organizations",
    "GET /enterprises/{enterprise}/actions/runner-groups/{runner_group_id}/runners",
    "GET /enterprises/{enterprise}/actions/runners",
    "GET /enterprises/{enterprise}/actions/runners/downloads",
    "GET /events",
    "GET /gists",
    "GET /gists/public",
    "GET /gists/starred",
    "GET /gists/{gist_id}/comments",
    "GET /gists/{gist_id}/commits",
    "GET /gists/{gist_id}/forks",
    "GET /installation/repositories",
    "GET /issues",
    "GET /marketplace_listing/plans",
    "GET /marketplace_listing/plans/{plan_id}/accounts",
    "GET /marketplace_listing/stubbed/plans",
    "GET /marketplace_listing/stubbed/plans/{plan_id}/accounts",
    "GET /networks/{owner}/{repo}/events",
    "GET /notifications",
    "GET /organizations",
    "GET /orgs/{org}/actions/permissions/repositories",
    "GET /orgs/{org}/actions/runner-groups",
    "GET /orgs/{org}/actions/runner-groups/{runner_group_id}/repositories",
    "GET /orgs/{org}/actions/runner-groups/{runner_group_id}/runners",
    "GET /orgs/{org}/actions/runners",
    "GET /orgs/{org}/actions/runners/downloads",
    "GET /orgs/{org}/actions/secrets",
    "GET /orgs/{org}/actions/secrets/{secret_name}/repositories",
    "GET /orgs/{org}/blocks",
    "GET /orgs/{org}/credential-authorizations",
    "GET /orgs/{org}/events",
    "GET /orgs/{org}/failed_invitations",
    "GET /orgs/{org}/hooks",
    "GET /orgs/{org}/hooks/{hook_id}/deliveries",
    "GET /orgs/{org}/installations",
    "GET /orgs/{org}/invitations",
    "GET /orgs/{org}/invitations/{invitation_id}/teams",
    "GET /orgs/{org}/issues",
    "GET /orgs/{org}/members",
    "GET /orgs/{org}/migrations",
    "GET /orgs/{org}/migrations/{migration_id}/repositories",
    "GET /orgs/{org}/outside_collaborators",
    "GET /orgs/{org}/packages",
    "GET /orgs/{org}/projects",
    "GET /orgs/{org}/public_members",
    "GET /orgs/{org}/repos",
    "GET /orgs/{org}/secret-scanning/alerts",
    "GET /orgs/{org}/team-sync/groups",
    "GET /orgs/{org}/teams",
    "GET /orgs/{org}/teams/{team_slug}/discussions",
    "GET /orgs/{org}/teams/{team_slug}/discussions/{discussion_number}/comments",
    "GET /orgs/{org}/teams/{team_slug}/discussions/{discussion_number}/comments/{comment_number}/reactions",
    "GET /orgs/{org}/teams/{team_slug}/discussions/{discussion_number}/reactions",
    "GET /orgs/{org}/teams/{team_slug}/invitations",
    "GET /orgs/{org}/teams/{team_slug}/members",
    "GET /orgs/{org}/teams/{team_slug}/projects",
    "GET /orgs/{org}/teams/{team_slug}/repos",
    "GET /orgs/{org}/teams/{team_slug}/team-sync/group-mappings",
    "GET /orgs/{org}/teams/{team_slug}/teams",
    "GET /projects/columns/{column_id}/cards",
    "GET /projects/{project_id}/collaborators",
    "GET /projects/{project_id}/columns",
    "GET /repos/{owner}/{repo}/actions/artifacts",
    "GET /repos/{owner}/{repo}/actions/runners",
    "GET /repos/{owner}/{repo}/actions/runners/downloads",
    "GET /repos/{owner}/{repo}/actions/runs",
    "GET /repos/{owner}/{repo}/actions/runs/{run_id}/artifacts",
    "GET /repos/{owner}/{repo}/actions/runs/{run_id}/attempts/{attempt_number}/jobs",
    "GET /repos/{owner}/{repo}/actions/runs/{run_id}/jobs",
    "GET /repos/{owner}/{repo}/actions/secrets",
    "GET /repos/{owner}/{repo}/actions/workflows",
    "GET /repos/{owner}/{repo}/actions/workflows/{workflow_id}/runs",
    "GET /repos/{owner}/{repo}/assignees",
    "GET /repos/{owner}/{repo}/autolinks",
    "GET /repos/{owner}/{repo}/branches",
    "GET /repos/{owner}/{repo}/check-runs/{check_run_id}/annotations",
    "GET /repos/{owner}/{repo}/check-suites/{check_suite_id}/check-runs",
    "GET /repos/{owner}/{repo}/code-scanning/alerts",
    "GET /repos/{owner}/{repo}/code-scanning/alerts/{alert_number}/instances",
    "GET /repos/{owner}/{repo}/code-scanning/analyses",
    "GET /repos/{owner}/{repo}/collaborators",
    "GET /repos/{owner}/{repo}/comments",
    "GET /repos/{owner}/{repo}/comments/{comment_id}/reactions",
    "GET /repos/{owner}/{repo}/commits",
    "GET /repos/{owner}/{repo}/commits/{commit_sha}/branches-where-head",
    "GET /repos/{owner}/{repo}/commits/{commit_sha}/comments",
    "GET /repos/{owner}/{repo}/commits/{commit_sha}/pulls",
    "GET /repos/{owner}/{repo}/commits/{ref}/check-runs",
    "GET /repos/{owner}/{repo}/commits/{ref}/check-suites",
    "GET /repos/{owner}/{repo}/commits/{ref}/statuses",
    "GET /repos/{owner}/{repo}/contributors",
    "GET /repos/{owner}/{repo}/deployments",
    "GET /repos/{owner}/{repo}/deployments/{deployment_id}/statuses",
    "GET /repos/{owner}/{repo}/events",
    "GET /repos/{owner}/{repo}/forks",
    "GET /repos/{owner}/{repo}/git/matching-refs/{ref}",
    "GET /repos/{owner}/{repo}/hooks",
    "GET /repos/{owner}/{repo}/hooks/{hook_id}/deliveries",
    "GET /repos/{owner}/{repo}/invitations",
    "GET /repos/{owner}/{repo}/issues",
    "GET /repos/{owner}/{repo}/issues/comments",
    "GET /repos/{owner}/{repo}/issues/comments/{comment_id}/reactions",
    "GET /repos/{owner}/{repo}/issues/events",
    "GET /repos/{owner}/{repo}/issues/{issue_number}/comments",
    "GET /repos/{owner}/{repo}/issues/{issue_number}/events",
    "GET /repos/{owner}/{repo}/issues/{issue_number}/labels",
    "GET /repos/{owner}/{repo}/issues/{issue_number}/reactions",
    "GET /repos/{owner}/{repo}/issues/{issue_number}/timeline",
    "GET /repos/{owner}/{repo}/keys",
    "GET /repos/{owner}/{repo}/labels",
    "GET /repos/{owner}/{repo}/milestones",
    "GET /repos/{owner}/{repo}/milestones/{milestone_number}/labels",
    "GET /repos/{owner}/{repo}/notifications",
    "GET /repos/{owner}/{repo}/pages/builds",
    "GET /repos/{owner}/{repo}/projects",
    "GET /repos/{owner}/{repo}/pulls",
    "GET /repos/{owner}/{repo}/pulls/comments",
    "GET /repos/{owner}/{repo}/pulls/comments/{comment_id}/reactions",
    "GET /repos/{owner}/{repo}/pulls/{pull_number}/comments",
    "GET /repos/{owner}/{repo}/pulls/{pull_number}/commits",
    "GET /repos/{owner}/{repo}/pulls/{pull_number}/files",
    "GET /repos/{owner}/{repo}/pulls/{pull_number}/requested_reviewers",
    "GET /repos/{owner}/{repo}/pulls/{pull_number}/reviews",
    "GET /repos/{owner}/{repo}/pulls/{pull_number}/reviews/{review_id}/comments",
    "GET /repos/{owner}/{repo}/releases",
    "GET /repos/{owner}/{repo}/releases/{release_id}/assets",
    "GET /repos/{owner}/{repo}/secret-scanning/alerts",
    "GET /repos/{owner}/{repo}/stargazers",
    "GET /repos/{owner}/{repo}/subscribers",
    "GET /repos/{owner}/{repo}/tags",
    "GET /repos/{owner}/{repo}/teams",
    "GET /repositories",
    "GET /repositories/{repository_id}/environments/{environment_name}/secrets",
    "GET /scim/v2/enterprises/{enterprise}/Groups",
    "GET /scim/v2/enterprises/{enterprise}/Users",
    "GET /scim/v2/organizations/{org}/Users",
    "GET /search/code",
    "GET /search/commits",
    "GET /search/issues",
    "GET /search/labels",
    "GET /search/repositories",
    "GET /search/topics",
    "GET /search/users",
    "GET /teams/{team_id}/discussions",
    "GET /teams/{team_id}/discussions/{discussion_number}/comments",
    "GET /teams/{team_id}/discussions/{discussion_number}/comments/{comment_number}/reactions",
    "GET /teams/{team_id}/discussions/{discussion_number}/reactions",
    "GET /teams/{team_id}/invitations",
    "GET /teams/{team_id}/members",
    "GET /teams/{team_id}/projects",
    "GET /teams/{team_id}/repos",
    "GET /teams/{team_id}/team-sync/group-mappings",
    "GET /teams/{team_id}/teams",
    "GET /user/blocks",
    "GET /user/emails",
    "GET /user/followers",
    "GET /user/following",
    "GET /user/gpg_keys",
    "GET /user/installations",
    "GET /user/installations/{installation_id}/repositories",
    "GET /user/issues",
    "GET /user/keys",
    "GET /user/marketplace_purchases",
    "GET /user/marketplace_purchases/stubbed",
    "GET /user/memberships/orgs",
    "GET /user/migrations",
    "GET /user/migrations/{migration_id}/repositories",
    "GET /user/orgs",
    "GET /user/packages",
    "GET /user/public_emails",
    "GET /user/repos",
    "GET /user/repository_invitations",
    "GET /user/starred",
    "GET /user/subscriptions",
    "GET /user/teams",
    "GET /users",
    "GET /users/{username}/events",
    "GET /users/{username}/events/orgs/{org}",
    "GET /users/{username}/events/public",
    "GET /users/{username}/followers",
    "GET /users/{username}/following",
    "GET /users/{username}/gists",
    "GET /users/{username}/gpg_keys",
    "GET /users/{username}/keys",
    "GET /users/{username}/orgs",
    "GET /users/{username}/packages",
    "GET /users/{username}/projects",
    "GET /users/{username}/received_events",
    "GET /users/{username}/received_events/public",
    "GET /users/{username}/repos",
    "GET /users/{username}/starred",
    "GET /users/{username}/subscriptions",
];

function isPaginatingEndpoint(arg) {
    if (typeof arg === "string") {
        return paginatingEndpoints.includes(arg);
    }
    else {
        return false;
    }
}

/**
 * @param octokit Octokit instance
 * @param options Options passed to Octokit constructor
 */
function paginateRest(octokit) {
    return {
        paginate: Object.assign(paginate.bind(null, octokit), {
            iterator: iterator.bind(null, octokit),
        }),
    };
}
paginateRest.VERSION = VERSION;

export { composePaginateRest, isPaginatingEndpoint, paginateRest, paginatingEndpoints };
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