import type { OracleInfo } from './types/crossbar.js';
import type { HealthyOraclesResponse, OracleHealthData } from './types/gateway.js';
export type RandomnessOracleSelectionTier = 'live' | 'fallback';
export type RandomnessOracleRejectionReason = 'missing-gateway' | 'not-on-queue' | 'verification-failed' | 'heartbeat-stale' | 'quote-expired' | 'restricted' | 'gateway-disabled' | 'pull-oracle-disabled' | 'version-mismatch' | 'health-data-unavailable';
export interface RandomnessOracleSelectorCandidate {
    oracleId: string;
    gatewayUrl?: string | null;
    version?: string | null;
    isOnQueue: boolean;
    isVerified: boolean;
    heartbeatFresh: boolean;
    quoteFresh: boolean;
    liveHealthy: boolean;
    restricted?: boolean;
    gatewayEnabled?: boolean;
    pullOracleEnabled?: boolean;
    lastHeartbeatUnix?: number;
    validUntilUnix?: number;
    activeConnections?: number;
    totalSubscriptions?: number;
    totalFeeds?: number;
}
export interface RandomnessOracleSelectionEvaluation {
    oracleId: string;
    tier?: RandomnessOracleSelectionTier;
    version?: string | null;
    rejectionReasons: RandomnessOracleRejectionReason[];
    liveHealthy: boolean;
}
export interface RandomnessOracleSelectionMetadata {
    tier: RandomnessOracleSelectionTier;
    majorityVersion: string | null;
    liveHealthyCandidateCount: number;
    fallbackCandidateCount: number;
    evaluations: RandomnessOracleSelectionEvaluation[];
}
export interface RandomnessOracleSelectionResult<T extends RandomnessOracleSelectorCandidate> {
    candidate: T;
    metadata: RandomnessOracleSelectionMetadata;
}
export interface HealthyOracleGatewaySnapshot {
    gatewayUrl: string;
    response: HealthyOraclesResponse;
}
export interface MergedHealthyOracleIndex {
    byPullOracle: Map<string, OracleHealthData>;
    bySecp256k1Key: Map<string, OracleHealthData>;
    majorityVersion: string | null;
}
export declare function evaluateRandomnessOracleCandidate(candidate: RandomnessOracleSelectorCandidate): RandomnessOracleSelectionEvaluation;
export declare function isRandomnessOracleCandidateEligible(candidate: RandomnessOracleSelectorCandidate): boolean;
export declare function selectRandomnessOracle<T extends RandomnessOracleSelectorCandidate>(candidates: T[]): RandomnessOracleSelectionResult<T>;
export declare function fetchHealthyOracleSnapshots(gatewayUrls: string[]): Promise<HealthyOracleGatewaySnapshot[]>;
export declare function mergeHealthyOracleSnapshots(snapshots: HealthyOracleGatewaySnapshot[]): MergedHealthyOracleIndex;
export declare function createFallbackOracleInfo(oracle: OracleInfo): RandomnessOracleSelectorCandidate;
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