import { readLines } from "https://deno.land/std@0.177.1/io/read_lines.ts";

function step(fish: number[]) {
    const result = [0,0,0,0,0,0,0,0,0];
    for (let i = 1; i <= 8; i++) {
        result[i-1] = fish[i];
    }
    result[8] = fish[0];
    result[6] += fish[0];
    return result;
}

async function simulate(rounds: number) {
    const file = await Deno.open("./Day6/input.txt");
    const lines = readLines(file);
    let line: string = (await lines.next()).value;

    let fish = [0,0,0,0,0,0,0,0,0]
    
    for (let s of line.split(",")) {
        fish[+s] += 1;
    }
    for (let i = 0; i < rounds; i++) {
        fish = step(fish);
    }
    return fish.reduce((a,b) => a + b)
}

async function Part1() {
    return simulate(80);
}

async function Part2() {
    return simulate(256);
}


console.log("Part1: " + await Part1());
console.log("Part1: " + await Part2());