/**
 * Plan Limits Helper
 *
 * Computes quotas, limits, and restrictions based on plan tiers.
 */
export interface PlanLimits {
    includedTokensPerMonth: number;
    payAsYouGoEnabled: boolean;
    pricePerNovaTokenUsd: number;
    enterpriseTokenCapPerMonth?: number;
    enterpriseCapBehavior?: "block" | "allow_overage";
}
/**
 * Get plan limits for a user/account
 * Note: Account and PlanTier models don't exist in simplified schema
 * Returns default free tier limits for now
 */
export declare function getPlanLimits(userId: string, // User.id is String in schema
accountId?: string): Promise<PlanLimits>;
/**
 * Get current month usage for user/account
 * Note: TokenUsage model uses 'timestamp' instead of 'createdAt', and stores data in metadata
 */
export declare function getCurrentMonthUsage(userId: string, // User.id is String in schema
accountId?: string): Promise<number>;
/**
 * Get today's usage for user/account
 * Note: TokenUsage model uses 'timestamp' instead of 'createdAt', and stores data in metadata
 */
export declare function getTodayUsage(userId: string, // User.id is String in schema
accountId?: string): Promise<number>;
/**
 * Check if user can make an AI request
 */
export declare function canMakeAIRequest(userId: string, // User.id is String in schema
accountId?: string, estimatedNovaTokens?: number): Promise<{
    allowed: boolean;
    reason?: string;
    limits: PlanLimits;
    currentUsage: number;
    remaining: number;
}>;
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