async function auth(reason) {
    return {
        type: "unauthenticated",
        reason,
    };
}

function isRateLimitError(error) {
    if (error.status !== 403) {
        return false;
    }
    /* istanbul ignore if */
    if (!error.response) {
        return false;
    }
    return error.response.headers["x-ratelimit-remaining"] === "0";
}

const REGEX_ABUSE_LIMIT_MESSAGE = /\babuse\b/i;
function isAbuseLimitError(error) {
    if (error.status !== 403) {
        return false;
    }
    return REGEX_ABUSE_LIMIT_MESSAGE.test(error.message);
}

async function hook(reason, request, route, parameters) {
    const endpoint = request.endpoint.merge(route, parameters);
    return request(endpoint).catch((error) => {
        if (error.status === 404) {
            error.message = `Not found. May be due to lack of authentication. Reason: ${reason}`;
            throw error;
        }
        if (isRateLimitError(error)) {
            error.message = `API rate limit exceeded. This maybe caused by the lack of authentication. Reason: ${reason}`;
            throw error;
        }
        if (isAbuseLimitError(error)) {
            error.message = `You have triggered an abuse detection mechanism. This maybe caused by the lack of authentication. Reason: ${reason}`;
            throw error;
        }
        if (error.status === 401) {
            error.message = `Unauthorized. "${endpoint.method} ${endpoint.url}" failed most likely due to lack of authentication. Reason: ${reason}`;
            throw error;
        }
        if (error.status >= 400 && error.status < 500) {
            error.message = error.message.replace(/\.?$/, `. May be caused by lack of authentication (${reason}).`);
        }
        throw error;
    });
}

const createUnauthenticatedAuth = function createUnauthenticatedAuth(options) {
    if (!options || !options.reason) {
        throw new Error("[@octokit/auth-unauthenticated] No reason passed to createUnauthenticatedAuth");
    }
    return Object.assign(auth.bind(null, options.reason), {
        hook: hook.bind(null, options.reason),
    });
};

export { createUnauthenticatedAuth };
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