// #define Day10
#if Day10
var bracketScores = new Dictionary<char, int>() { { ')', 3 }, { ']', 57 }, { '}', 1197 }, { '>', 25137 } };
var closingBracketExpect = new Dictionary<char, char>() { { ')', '(' }, { ']', '[' }, { '}', '{' }, { '>', '<' } };
var openingBracketExpect = closingBracketExpect.ToDictionary(x => x.Value, y => y.Key);

var completeScores = new Dictionary<char, int>() { {'(', 1}, {'[', 2}, {'{', 3}, {'<', 4} };

var chunkScores = File.ReadAllLines("day10/input")
    .Select(CheckChunk)
    .ToList();

Console.WriteLine(chunkScores.Select(x => x.score).Sum());

int half = chunkScores.Count(x => x.score > 0) / 2;

Console.WriteLine(
    chunkScores
        .Where(x => x.score == 0)
        .Select(x => x.remaining)
        .Select(x => x.Aggregate(0L, (score, c) => score * 5 + completeScores[c]))
        .OrderBy(x => x)
        .Skip(half).First());

ChunkScoreAndRemaining CheckChunk(string line) {
    var stack = new Stack<char>();
    foreach (var b in line) {
        if (openingBracketExpect.Keys.Contains(b)) {
            stack.Push(b);
        }
        else {
            char openingBracket = stack.Pop();
            if (openingBracket != closingBracketExpect[b]) {
                return new ChunkScoreAndRemaining(bracketScores[b], stack);
            }
        }
    }

    return new ChunkScoreAndRemaining(0, stack);
}

record ChunkScoreAndRemaining(long score, Stack<char> remaining);
#endif