import { CanActivate, Type } from '@nestjs/common';
/**
 * Factory function to create a Wristband authentication guard.
 *
 * Creates middleware that validates authentication using configurable strategies (SESSION, JWT, or both).
 * Supports multi-strategy authentication with automatic fallback between strategies.
 *
 * The factory exists to create distinct guard identities for cases where multiple guards with
 * different configurations are needed in the same application.
 *
 * Strategy behavior:
 * - SESSION: Validates session authentication, optionally checks CSRF, and refreshes expired tokens
 * - JWT: Validates JWT bearer tokens from Authorization header
 * - Multi-strategy: Tries strategies in configured order, falls back to next on failure
 *
 * NOTE: Token refresh only occurs when both `refreshToken` and `expiresAt` are present in the session.
 *
 * @param configKey - The ConfigModule key to read guard configuration from (default: 'wristbandAuthGuard')
 * @param authToken - The DI token for the WristbandExpressAuthService (default: DEFAULT_AUTH_TOKEN)
 * @returns A guard class that can be used with @UseGuards()
 *
 * @throws {UnauthorizedException} If all configured strategies fail authentication or token refresh fails
 * @throws {ForbiddenException} If CSRF token validation fails (SESSION strategy only)
 * @throws {InternalServerErrorException} If an unexpected error occurs during authentication
 *
 * @example
 * ```typescript
 * // Default guard (reads from 'wristbandAuthGuard' config)
 * export const WristbandAuthGuard = createWristbandAuthGuard();
 *
 * @Controller('api')
 * export class MyController {
 *   @Get('protected')
 *   @UseGuards(WristbandAuthGuard)
 *   protectedRoute() {
 *     return { message: 'Authenticated' };
 *   }
 * }
 * ```
 *
 * @example
 * ```typescript
 * // Custom guard with different config and service instance
 * export const AdminAuthGuard = createWristbandAuthGuard('adminAuthGuard', 'ADMIN_AUTH_TOKEN');
 *
 * @Controller('admin')
 * export class AdminController {
 *   @Get('dashboard')
 *   @UseGuards(AdminAuthGuard)
 *   adminDashboard() {
 *     return { message: 'Admin access granted' };
 *   }
 * }
 * ```
 *
 * @example
 * ```typescript
 * // Guard configuration in ConfigModule
 * import { registerAs } from '@nestjs/config';
 * import type { AuthGuardConfig } from '@wristband/nestjs-auth';
 *
 * export const authGuardConfig = registerAs('wristbandAuthGuard', (): AuthGuardConfig => ({
 *   authStrategies: ['SESSION', 'JWT'],
 *   sessionConfig: {
 *     sessionOptions: {
 *       secrets: process.env.SESSION_SECRET,
 *       enableCsrfProtection: true,
 *     }
 *   }
 * }));
 * ```
 */
export declare function createWristbandAuthGuard(configKey?: string, authToken?: string): Type<CanActivate>;