AlexAegis/advent-of-code

import { Direction } from '@alexaegis/advent-of-code-lib';

export type MovementInstruction = 'R' | 'L' | number;

export const parseMovementInstructions = (instructions: string): MovementInstruction[] => {
    const result: MovementInstruction[] = [];
    let numberStack: string[] = [];
    for (const char of instructions) {
        if (char === 'L' || char === 'R') {
            if (numberStack.length > 0) {
                result.push(Number.parseInt(numberStack.join(''), 10));
                numberStack = [];
            }
            result.push(char);
        } else {
            numberStack.push(char);
        }
    }

    if (numberStack.length > 0) {
        result.push(Number.parseInt(numberStack.join(''), 10));
    }

    return result;
};

export const getFacingScore = (direction: Direction): number => {
    switch (direction) {
        case Direction.EAST: {
            return 0;
        }
        case Direction.SOUTH: {
            return 1;
        }
        case Direction.WEST: {
            return 2;
        }
        case Direction.NORTH: {
            return 3;
        }
        default: {
            return 0;
        }
    }
};