const REGEX_IS_INSTALLATION_LEGACY = /^v1\./;
const REGEX_IS_INSTALLATION = /^ghs_/;
const REGEX_IS_USER_TO_SERVER = /^ghu_/;
async function auth(token) {
    const isApp = token.split(/\./).length === 3;
    const isInstallation = REGEX_IS_INSTALLATION_LEGACY.test(token) ||
        REGEX_IS_INSTALLATION.test(token);
    const isUserToServer = REGEX_IS_USER_TO_SERVER.test(token);
    const tokenType = isApp
        ? "app"
        : isInstallation
            ? "installation"
            : isUserToServer
                ? "user-to-server"
                : "oauth";
    return {
        type: "token",
        token: token,
        tokenType,
    };
}

/**
 * Prefix token for usage in the Authorization header
 *
 * @param token OAuth token or JSON Web Token
 */
function withAuthorizationPrefix(token) {
    if (token.split(/\./).length === 3) {
        return `bearer ${token}`;
    }
    return `token ${token}`;
}

async function hook(token, request, route, parameters) {
    const endpoint = request.endpoint.merge(route, parameters);
    endpoint.headers.authorization = withAuthorizationPrefix(token);
    return request(endpoint);
}

const createTokenAuth = function createTokenAuth(token) {
    if (!token) {
        throw new Error("[@octokit/auth-token] No token passed to createTokenAuth");
    }
    if (typeof token !== "string") {
        throw new Error("[@octokit/auth-token] Token passed to createTokenAuth is not a string");
    }
    token = token.replace(/^(token|bearer) +/i, "");
    return Object.assign(auth.bind(null, token), {
        hook: hook.bind(null, token),
    });
};

export { createTokenAuth };
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