As you ponder the solitude of space and the ever-increasing three-hour roundtrip for messages between you and Earth, you notice that the Space Mail Indicator Light is blinking. To help keep you sane, the Elves have sent you a care package.

It's a new game for the ship's arcade cabinet! Unfortunately, the arcade is all the way on the other end of the ship. Surely, it won't be hard to build your own - the care package even comes with schematics.

Read the full puzzle.

using System.Collections.Generic;
using System.Linq;

namespace AdventOfCode.Y2019.Day13;

[ProblemName("Care Package")]
class Solution : Solver {

    public object PartOne(string input) {
        var icm = new IntCodeMachine(input);
        var output = icm.Run();
        var chunks = Chunk(output, 3);
        return chunks.Count(x => x[2] == 2);
    }

    public object PartTwo(string input) {
        var icm = new IntCodeMachine(input);
        icm.memory[0] = 2;
        var score = 0;
        var icolBall = -1;
        var icolPaddle = -1;
        var dir = 0;
        while (true) {
            var output = icm.Run(dir);
            var chunks = Chunk(output, 3);
            foreach (var chunk in chunks) {
                var (icol, irow, block) = (chunk[0], chunk[1], chunk[2]);
                if ((icol, irow) == (-1, 0)) {
                    score = (int)block;
                } if (block == 3) {
                    icolPaddle = (int)icol;
                } else if (block == 4) {
                    icolBall = (int)icol;
                }
            }

            if (icm.Halted()) {
                break;
            }

            dir = 
                icolBall < icolPaddle ? -1 :
                icolBall > icolPaddle ? 1 :
                0;
           
        }
        return score;
    }

    public T[][] Chunk<T>(IEnumerable<T> source, int chunksize) {
        var res = new List<T[]>();
        while (source.Any()) {
            res.Add(source.Take(chunksize).ToArray());
            source = source.Skip(chunksize);
        }
        return res.ToArray();
    }
}

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