import { Severity } from './config';
/** SQL operation type */
export type SqlOperation = 'SELECT' | 'INSERT' | 'UPDATE' | 'DELETE' | 'OTHER';
export interface RawQueryEvent {
    /** SQL text (may be parameterised) */
    query: string;
    /** Bound parameters (if available) */
    params?: unknown[];
    /** Query execution duration in ms */
    duration: number;
    /** Timestamp when the query started */
    startedAt: Date;
    /** Target database name (optional) */
    database?: string;
    /** Optional caller file:line hint */
    caller?: string;
}
export interface QueryMetrics extends RawQueryEvent {
    /** Unique sequential ID */
    id: number;
    /** Detected operation type */
    operation: SqlOperation;
    /** Primary table name extracted from query */
    table: string;
    /** Whether this query exceeded the threshold */
    isSlow: boolean;
    /** Severity bucket */
    severity: Severity;
    /** Estimated rows scanned (adapter-dependent) */
    rowsScanned?: number;
    /** Estimated rows returned */
    rowsReturned?: number;
    /** EXPLAIN plan text (if fetched) */
    explainPlan?: string;
}
export interface OperationBreakdown {
    SELECT: number;
    INSERT: number;
    UPDATE: number;
    DELETE: number;
    OTHER: number;
}
export interface PercentileBuckets {
    p50: number;
    p75: number;
    p90: number;
    p95: number;
    p99: number;
    max: number;
}
export interface QueryStats {
    /** Total queries tracked since start */
    totalQueries: number;
    /** Queries that exceeded the threshold */
    slowQueries: QueryMetrics[];
    /** Queries that exceeded 3× the threshold (critical) */
    criticalQueries: QueryMetrics[];
    /** Average duration across all queries (ms) */
    averageDuration: number;
    /** Duration percentile buckets */
    percentiles: PercentileBuckets;
    /** Operation type distribution */
    operationBreakdown: OperationBreakdown;
    /** Top N slowest queries ever seen */
    topSlowest: QueryMetrics[];
    /** Timestamp of the first recorded query */
    trackedSince: Date | null;
    /** Timestamp of the most recent recorded query */
    lastQueryAt: Date | null;
    /** Table hit counts */
    tableHitCounts: Record<string, number>;
}
export interface SlowQueryEvent {
    metrics: QueryMetrics;
    /** Threshold that was breached (ms) */
    thresholdMs: number;
}
export interface MonitorEvents {
    /** Fired for every tracked query */
    query: (metrics: QueryMetrics) => void;
    /** Fired only when a query is slow */
    'slow-query': (event: SlowQueryEvent) => void;
    /** Fired for critical queries (≥ 3× threshold) */
    'critical-query': (event: SlowQueryEvent) => void;
    /** Fired when the monitor starts */
    start: () => void;
    /** Fired when the monitor stops */
    stop: () => void;
    /** Fired on internal errors */
    error: (err: Error) => void;
}
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