const crypto = require('crypto');

const md5Hex = str => crypto.createHash('md5').update(str).digest('hex');

const solve = doorId => {
    let pwd = [];
    for (let i = 0, j = 0; j < 8; i++) {
        let hex = md5Hex(doorId + i);
        if (hex.slice(0,5) === '00000') {
            j++;
            pwd.push(hex[5]);
        }
    }
    return pwd.join('');
}

console.log(`Part1 answer: ${solve('uqwqemis')}`);

const getPosition = c => {
    let n = parseInt(c, 10);
    if (n >= 0 && n <= 7) {
        return n;
    } else {
        return -1;
    }
}

const solve2 = doorId => {
    let pwd = [], mark = [];
    for (let i = 0, j = 0; j < 8; i++) {
        let hex = md5Hex(doorId + i), pos;
        if (hex.slice(0,5) === '00000' && (pos = getPosition(hex[5])) > -1 && !mark[pos]) {
            j++;
            pwd[pos] = hex[6];
            mark[pos] = true;
        }
    }
    return pwd.join('');
}

console.log(`Part2 answer: ${solve2('uqwqemis')}`);