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using System;
using System.Collections.Generic;
using System.Linq;
using aoc2019.lib;
namespace aoc2019
{
internal sealed class Day13 : Day
{
private readonly Dictionary<(int x, int y), int> board;
private readonly IntCodeVM vm;
public Day13() : base(13, "Care Package")
{
vm = new IntCodeVM(Input.First());
board = new Dictionary<(int, int), int>();
}
private void UpdateTiles(IEnumerable<long> queue)
{
var input = queue.Select(i => (int) i).ToList();
for (var i = 0; i < input.Count - 2; i += 3)
{
var x = input[i];
var y = input[i + 1];
var val = input[i + 2];
if (board.ContainsKey((x, y)))
board[(x, y)] = val;
else
board.Add((x, y), val);
}
}
private void PrintBoard()
{
foreach (var ((x, y), value) in board)
{
if (x < 0 || y < 0) continue;
Console.SetCursorPosition(x, y);
Console.Write(value switch
{
0 => " ",
1 => "|",
2 => "B",
3 => "_",
4 => ".",
_ => value
});
}
}
protected override string Part1()
{
vm.Reset();
vm.Run();
return $"{vm.output.Where((v, i) => (i + 1) % 3 == 0 && v == 2).Count()}";
}
protected override string Part2()
{
vm.Reset();
vm.memory[0] = 2;
var printBoard = false;
var gameTicks = 0;
if (printBoard) Console.Clear();
var haltType = IntCodeVM.HaltType.Waiting;
while (haltType == IntCodeVM.HaltType.Waiting)
{
haltType = vm.Run();
UpdateTiles(vm.output);
var (ball, _) = board.First(t => t.Value == 4).Key;
var (paddle, _) = board.First(t => t.Value == 3).Key;
vm.AddInput(ball > paddle ? 1 : ball < paddle ? -1 : 0);
gameTicks++;
if (printBoard) PrintBoard();
}
return $"after {gameTicks} moves, the score is: {board[(-1, 0)]}";
}
}
}
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