import type { Color, DirectionIndex, FriendlyPiece, Graph, Index, ParsedGame, PositionIndex, Positions, Unoccupied } from './base';
import type { ToPositions } from '@/notation';
/**
 * Walk along the board, stopping short of friendly pieces
 **/
export type Walk<Game extends ParsedGame, Friendly extends Color, From extends Index, Direction extends Exclude<DirectionIndex, 4>, // <- cannot walk to center index
Acc extends Index[] = [], To = Graph[From][Direction]> = To extends Index ? Game['board'][To] extends Unoccupied ? Walk<Game, Friendly, To, Direction, [...Acc, To]> : Game['board'][To] extends FriendlyPiece<Friendly> ? Acc : [...Acc, To] : Acc;
/**
 * Walk and cast results to positions
 */
export type WalkPositions<Game extends ParsedGame, Friendly extends Color, From extends Positions[Index], Direction extends Exclude<DirectionIndex, 4>, Path = Walk<Game, Friendly, PositionIndex[From], Direction>> = Path extends Index[] ? ToPositions<Path> : never;