'use client';

import { IndexRecommendation } from "../query.cjs";

//#region src/action-plan/index-coverage.d.ts
/** A unique index recommendation plus how it scored across the queries it helps. */
interface AggregatedIndexRecommendation {
  index: IndexRecommendation;
  affectedQueryCount: number;
  averageCostReduction: number;
  bestCostReduction: number;
  affectedQueryHashes: string[];
}
/**
 * Check if indexA covers indexB (A is a superset that includes B as a prefix).
 *
 * Rules:
 * - Same schema and table
 * - A's columns start with B's columns (B is a prefix of A)
 * - Sort directions must match for prefix columns
 * - WHERE clauses must be compatible
 *
 * Examples:
 * - (a, b, c) covers (a, b) and (a)
 * - (a DESC, b) covers (a DESC) but NOT (a ASC)
 */
declare function indexCovers(a: IndexRecommendation, b: IndexRecommendation): boolean;
interface IndexGroup {
  /** The covering index (largest/most comprehensive) */
  primary: AggregatedIndexRecommendation;
  /** Indexes that are covered by the primary (prefixes of primary) */
  covered: AggregatedIndexRecommendation[];
}
/**
 * Group indexes by coverage relationships.
 *
 * Returns groups where each group has a "primary" index that covers
 * zero or more "covered" indexes. Indexes that don't cover or aren't
 * covered by any other index become their own single-item group.
 */
declare function groupIndexesByCoverage(indexes: AggregatedIndexRecommendation[]): IndexGroup[];
//#endregion
export { AggregatedIndexRecommendation, IndexGroup, groupIndexesByCoverage, indexCovers };
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