/**
 * Types for TONL Indexing System (T021)
 */
export type IndexType = 'hash' | 'btree';
export interface IndexOptions {
    /**
     * Index name
     */
    name: string;
    /**
     * Fields to index (path expressions)
     */
    fields: string[];
    /**
     * Unique constraint
     */
    unique?: boolean;
    /**
     * Index type
     */
    type?: IndexType;
    /**
     * Case-insensitive for string keys
     */
    caseInsensitive?: boolean;
}
export interface IndexEntry {
    /**
     * Index key (extracted value or compound key)
     */
    key: any;
    /**
     * Document path to the indexed item
     */
    path: string;
    /**
     * Original value (for validation)
     */
    value?: any;
}
export interface IndexStats {
    /**
     * Number of entries in index
     */
    size: number;
    /**
     * Memory usage estimate (bytes)
     */
    memoryUsage: number;
    /**
     * Index type
     */
    type: IndexType;
    /**
     * Is unique index
     */
    unique: boolean;
    /**
     * Number of collisions (for hash)
     */
    collisions?: number;
    /**
     * Tree depth (for btree)
     */
    depth?: number;
}
export interface IndexQueryResult {
    /**
     * Matching paths
     */
    paths: string[];
    /**
     * Number of results
     */
    count: number;
    /**
     * Query time in ms
     */
    queryTime?: number;
}
/**
 * Base interface for all index implementations
 */
export interface IIndex {
    /**
     * Index name
     */
    readonly name: string;
    /**
     * Index type
     */
    readonly type: IndexType;
    /**
     * Insert entry into index
     */
    insert(key: any, path: string, value?: any): void;
    /**
     * Remove entry from index
     */
    remove(key: any, path?: string): boolean;
    /**
     * Find entries by key
     */
    find(key: any): string[];
    /**
     * Check if key exists
     */
    has(key: any): boolean;
    /**
     * Clear all entries
     */
    clear(): void;
    /**
     * Get index size
     */
    size(): number;
    /**
     * Get index statistics
     */
    stats(): IndexStats;
    /**
     * Range query (for ordered indices like btree)
     */
    range?(start: any, end: any): string[];
    /**
     * Get all keys
     */
    keys(): IterableIterator<any>;
    /**
     * Get all entries
     */
    entries(): IterableIterator<IndexEntry>;
}
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