#!/bin/node

const fs = require('fs');

fs.readFile('input.txt', (err, data) => {
    const rules = data.toString()
        .split('\n')
        .filter(rule => rule.length > 0)
        .map(rule => rule.split(" bags contain "))
        .map(rule => [rule[0], rule[1].split(', ')
            .filter(line => !line.endsWith('no other bags.'))
            .map(line => line.replace(/ bags?\.?/, ''))
            .map(line => {
                const firstSpaceIndex = line.indexOf(' ');
                return {
                    count: parseInt(line.substring(0, firstSpaceIndex)),
                    bagColor: line.substring(firstSpaceIndex + 1),
                };
            })]);
    const ruleMap = {};
    for (const [containerColor, contents] of rules) {
        ruleMap[containerColor] = contents;
    }

    const matchingColors = [];
    let matchingColorsCount;
    do {
        matchingColorsCount = matchingColors.length;
        for (const [containerColor, contents] of rules) {
            if (matchingColors.indexOf(containerColor) < 0 &&
                (contents.find(content => content.bagColor === 'shiny gold' || matchingColors.indexOf(content.bagColor) >= 0))) {
                matchingColors.push(containerColor);
            }
        }
    } while (matchingColorsCount !== matchingColors.length);

    function countBagsInBag(bagColor, bagCount) {
        const contents = ruleMap[bagColor];
        return bagCount + bagCount * contents.reduce((sum, content) => sum + countBagsInBag(content.bagColor, content.count), 0);
    }

    console.log(matchingColors.length, countBagsInBag('shiny gold', 1) - 1);
});