/**
 * Base class for all K-Nearest Neighbors (KNN) search algorithms.
 *
 * Provides a common interface for elements management and search operations.
 *
 * @abstract
 * @category KNN
 * @template {number[] | Float64Array} T - Type of elements
 * @template {Object} Para - Type of parameters
 * @class
 */
export class KNN<T extends number[] | Float64Array, Para extends Object> {
  /**
   * @param {T[]} elements
   * @param {Para} parameters
   */
  constructor(elements: T[], parameters: Para);
  /** @type {T[]} */
  _elements: T[];
  /** @type {Para} */
  _parameters: Para;
  /** @type {"typed" | "array"} */
  _type: "typed" | "array";
  /**
   * @abstract
   * @param {T} t
   * @param {number} k
   * @returns {{ element: T; index: number; distance: number }[]}
   */
  search(
    t: T,
    k: number,
  ): {
    element: T;
    index: number;
    distance: number;
  }[];
  /**
   * @abstract
   * @param {number} i
   * @param {number} k
   * @returns {{ element: T; index: number; distance: number }[]}
   */
  search_by_index(
    i: number,
    k: number,
  ): {
    element: T;
    index: number;
    distance: number;
  }[];
}
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