/**
 * Conversion utilities between square notation and internal indices
 */
import { Square, SquareIndex, FileIndex, RankIndex } from '../types';
/**
 * Convert square notation (e.g., "A1", "E4") to square index (0-63)
 *
 * Board layout:
 * 56 57 58 59 60 61 62 63  (Rank 8) - A8 to H8
 * 48 49 50 51 52 53 54 55  (Rank 7)
 * ...
 *  8  9 10 11 12 13 14 15  (Rank 2)
 *  0  1  2  3  4  5  6  7  (Rank 1) - A1 to H1
 *
 * @param square - Square notation (case-insensitive)
 * @returns Square index (0-63)
 * @throws Error if square notation is invalid
 */
export declare function squareToIndex(square: Square): SquareIndex;
/**
 * Convert square index (0-63) to square notation (e.g., "A1", "E4")
 *
 * @param index - Square index (0-63)
 * @returns Square notation in uppercase
 * @throws Error if index is out of range
 */
export declare function indexToSquare(index: SquareIndex): Square;
/**
 * Get file index (0-7) from square index
 *
 * @param index - Square index (0-63)
 * @returns File index (0=A, 1=B, ..., 7=H)
 */
export declare function getFileIndex(index: SquareIndex): FileIndex;
/**
 * Get rank index (0-7) from square index
 *
 * @param index - Square index (0-63)
 * @returns Rank index (0=1, 1=2, ..., 7=8)
 */
export declare function getRankIndex(index: SquareIndex): RankIndex;
/**
 * Get file from square notation
 *
 * @param square - Square notation (case-insensitive)
 * @returns File index (0-7)
 */
export declare function getFile(square: Square): FileIndex;
/**
 * Get rank from square notation
 *
 * @param square - Square notation (case-insensitive)
 * @returns Rank index (0-7)
 */
export declare function getRank(square: Square): RankIndex;
/**
 * Create square index from file and rank indices
 *
 * @param file - File index (0-7)
 * @param rank - Rank index (0-7)
 * @returns Square index (0-63)
 */
export declare function fileRankToIndex(file: FileIndex, rank: RankIndex): SquareIndex;
/**
 * Check if square notation is valid
 *
 * @param square - Square notation
 * @returns true if valid
 */
export declare function isValidSquare(square: string): boolean;
/**
 * Check if square index is valid
 *
 * @param index - Square index
 * @returns true if valid (0-63)
 */
export declare function isValidIndex(index: number): boolean;
/**
 * Convert square index to bitboard (single bit set)
 *
 * @param index - Square index (0-63)
 * @returns Bitboard with single bit set
 */
export declare function indexToBitboard(index: SquareIndex): bigint;
/**
 * Convert square notation to bitboard
 *
 * @param square - Square notation
 * @returns Bitboard with single bit set
 */
export declare function squareToBitboard(square: Square): bigint;
/**
 * Get all set bits (square indices) from a bitboard
 *
 * @param bitboard - Bitboard to extract indices from
 * @returns Array of square indices where bits are set
 */
export declare function bitboardToIndices(bitboard: bigint): SquareIndex[];
/**
 * Get the index of the lowest set bit in a bitboard (O(1) via De Bruijn)
 */
export declare function getLowestSetBit(bitboard: bigint): SquareIndex;
/**
 * Get the index of the highest set bit in a bitboard
 */
export declare function getHighestSetBit(bitboard: bigint): SquareIndex;
/**
 * Count the number of set bits in a bitboard (population count)
 *
 * @param bitboard - Bitboard
 * @returns Number of set bits
 */
export declare function popCount(bitboard: bigint): number;
/**
 * Calculate Manhattan distance between two squares
 *
 * @param from - Source square index
 * @param to - Target square index
 * @returns Manhattan distance
 */
export declare function manhattanDistance(from: SquareIndex, to: SquareIndex): number;
/**
 * Calculate Chebyshev distance between two squares (king moves)
 *
 * @param from - Source square index
 * @param to - Target square index
 * @returns Chebyshev distance
 */
export declare function chebyshevDistance(from: SquareIndex, to: SquareIndex): number;
/**
 * Check if a square is on the edge of the board
 *
 * @param index - Square index
 * @returns true if on edge
 */
export declare function isOnEdge(index: SquareIndex): boolean;
/**
 * Check if square is on A-file
 */
export declare function isAFile(index: SquareIndex): boolean;
/**
 * Check if square is on H-file
 */
export declare function isHFile(index: SquareIndex): boolean;
/**
 * Check if square is on rank 1
 */
export declare function isRank1(index: SquareIndex): boolean;
/**
 * Check if square is on rank 8
 */
export declare function isRank8(index: SquareIndex): boolean;
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