import { ProviderV1, LanguageModelV1 } from '@ai-sdk/provider';
import { Resolvable, FetchFunction } from '@ai-sdk/provider-utils';
import { OAuth2Client, Credentials } from 'google-auth-library';

type GoogleCloudCodeModelId = 'gemini-2.5-flash' | 'gemini-2.5-pro' | (string & {});
interface GoogleCloudCodeSettings {
    /**
     * Optional. The maximum number of tokens to consider when sampling.
     *
     * Models use nucleus sampling or combined Top-k and nucleus sampling.
     * Top-k sampling considers the set of topK most probable tokens.
     * Models running with nucleus sampling don't allow topK setting.
     */
    topK?: number;
    /**
     * A list of unique safety settings for blocking unsafe content.
     */
    safetySettings?: Array<{
        category: string;
        threshold: string;
    }>;
    /**
     * Enable using the web grounding service and search for grounding sources in the response.
     *
     * Default: false (Google AI) or true (Vertex AI)
     */
    useSearchGrounding?: boolean;
}

interface GoogleCloudCodeProvider extends ProviderV1 {
    (modelId: GoogleCloudCodeModelId, settings?: GoogleCloudCodeSettings): LanguageModelV1;
    languageModel(modelId: GoogleCloudCodeModelId, settings?: GoogleCloudCodeSettings): LanguageModelV1;
}
interface GoogleCloudCodeProviderSettings {
    /**
     * OAuth access token for authentication.
     * If not provided, the provider will attempt to use OAuth authentication.
     */
    accessToken?: Resolvable<string | undefined>;
    /**
     * Google Cloud project ID.
     * If not provided, the provider will attempt to retrieve it automatically.
     */
    projectId?: Resolvable<string | undefined>;
    /**
     * OAuth credentials for automatic authentication.
     * If provided, the provider will use these credentials to obtain access tokens.
     */
    credentials?: {
        access_token: string;
        refresh_token?: string;
        expiry_date?: number;
    };
    /**
     * Whether to use OAuth authentication.
     * If true and no credentials are provided, you must authenticate separately.
     * Defaults to true if no accessToken is provided.
     */
    useOAuth?: boolean;
    /**
     * Custom directory for storing OAuth credentials.
     * Defaults to ~/.gemini
     * Can also be overridden with GOOGLE_APPLICATION_CREDENTIALS environment variable.
     */
    credentialDirectory?: string;
    /**
     * Base URL for the Cloud Code API.
     * Defaults to https://cloudcode-pa.googleapis.com
     */
    baseURL?: string;
    /**
     * Custom headers to include in requests.
     */
    headers?: Resolvable<Record<string, string | undefined>>;
    /**
     * Custom fetch implementation.
     */
    fetch?: FetchFunction;
}
/**
 * Create a Google Cloud Code provider instance.
 */
declare function createGoogleCloudCode(options?: GoogleCloudCodeProviderSettings): GoogleCloudCodeProvider;
/**
 * Default Google Cloud Code provider instance.
 */
declare const googleCloudCode: GoogleCloudCodeProvider;

declare class GoogleCloudCodeAuth {
    private static oauthClient;
    private static cachedProjectId;
    private static customCredentialDir;
    static getOAuthClient(): Promise<OAuth2Client>;
    static setCredentials(credentials: Credentials): Promise<void>;
    static getAccessToken(): Promise<string | undefined>;
    static generateAuthUrl(redirectUri: string, state: string): string;
    private static callEndpoint;
    private static loadCodeAssist;
    private static onboardUser;
    private static getClientMetadata;
    private static getPlatform;
    static setupUser(): Promise<string>;
    static getProjectId(): Promise<string>;
    static clearCache(): Promise<void>;
    /**
     * Complete OAuth authentication flow with browser
     * Opens browser for authentication and handles the OAuth callback
     * @param options - Optional configuration for the auth flow
     * @returns Promise that resolves when authentication is complete
     */
    static authenticate(options?: {
        /** Force re-authentication even if already authenticated */
        force?: boolean;
        /** Custom success redirect URL */
        successUrl?: string;
        /** Custom failure redirect URL */
        failureUrl?: string;
        /** Skip browser opening */
        skipBrowser?: boolean;
        /** Custom directory for storing credentials */
        credentialDirectory?: string;
    }): Promise<void>;
    /**
     * Check if the user is authenticated
     * @returns True if authenticated with valid credentials
     */
    static isAuthenticated(): Promise<boolean>;
    /**
     * Get information about the authenticated user
     * @returns User information including email
     */
    static getUserInfo(): Promise<{
        email?: string;
        name?: string;
        picture?: string;
    }>;
    /**
     * Find an available port for the OAuth callback server
     */
    private static getAvailablePort;
    /**
     * Create OAuth callback server
     */
    private static createOAuthCallbackServer;
    static setCredentialDirectory(directory: string): void;
    static getCredentialDirectory(): string;
    private static getCachedCredentialPath;
    private static loadCachedCredentials;
    private static cacheCredentials;
}

export { GoogleCloudCodeAuth, type GoogleCloudCodeModelId, type GoogleCloudCodeProvider, type GoogleCloudCodeProviderSettings, type GoogleCloudCodeSettings, createGoogleCloudCode, googleCloudCode };