import { Board, GamePiece } from "../types/GameBoard";
import { FuelCard } from "../types/FuelCard";

/** @internal */
export function tractorBeam(board: Board, origin: number, magnitude: number) {
	let delta = 0;
	// let movedShips: GamePiece[] = [];

	while (true) {
		delta++;

		let behind = origin - delta;
		let ahead = origin + delta;

		let negativeNewPosition = behind;
		let positiveNewPosition = ahead;
		let behindShip = board[behind];
		let aheadShip = board[ahead];

		/*
		Check for a ship behind the origin, if there is a ship there then pull
		it towards the origin (forwards). If it were to collide with another
		ship, then drift until it no longer collides.
		*/
		if (
			behind >= 0
			&& behindShip != null
		) {
			let localMagnitude = magnitude;
			while (board[behind + localMagnitude] != null) {
				localMagnitude++;
			};
			negativeNewPosition = behind + localMagnitude;
			board[behind] = null;
		};

		/*
		Check for a ship ahead of the origin, if there is a ship there then
		pull it towards the origin (backwards). If it were to collide with
		another ship, then drift until it no longer collides.
		*/
		if (
			ahead < board.length
			&& aheadShip
		) {
			let localMagnitude = magnitude;
			while (board[ahead - localMagnitude] != null) {
				localMagnitude++;
			};
			positiveNewPosition = ahead - localMagnitude;
			board[ahead] = null;
		};

		// Simultaneous movement
		if (aheadShip) {
			board[positiveNewPosition] = aheadShip;
		};
		if (behindShip) {
			board[negativeNewPosition] = behindShip;
		};


		if (behind < 0 && ahead >= board.length) {
			break;
		};
	};
};

/** @internal */
export function moveShip(board: Board, shipLocation: number, fuel: FuelCard) {};

export function processCard(board: Board, shipLocation: number, fuel: FuelCard) {};