From 91a90afb677196c2119d92a02c9be18f1baeba5c Mon Sep 17 00:00:00 2001
From: Timothy Warren <twarren@nabancard.com>
Date: Thu, 14 Dec 2023 16:28:31 -0500
Subject: [PATCH] More work on 2023 day7 part 1

---
 2023/day7/src/main.rs | 144 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 140 insertions(+), 4 deletions(-)

diff --git a/2023/day7/src/main.rs b/2023/day7/src/main.rs
index 37d81ec..1c0b7c8 100644
--- a/2023/day7/src/main.rs
+++ b/2023/day7/src/main.rs
@@ -1,12 +1,148 @@
+use crate::CardType::Four;
+use crate::HandType::{
+    FiveOfAKind, FourOfAKind, FullHouse, HighCard, OnePair, ThreeOfAKind, TwoPair,
+};
+use std::cmp::Ordering;
+use std::collections::HashMap;
+
 const FILE_STR: &str = include_str!("input.txt");
+const EXAMPLE_FILE_STR: &str = include_str!("example-input.txt");
+#[derive(Clone, Debug, Default, PartialOrd, Ord, PartialEq, Eq, Hash)]
+#[repr(u8)]
+enum CardType {
+    #[default]
+    Two = 0,
+    Three,
+    Four,
+    Five,
+    Six,
+    Seven,
+    Eight,
+    Nine,
+    Joker,
+    Jack,
+    Queen,
+    King,
+    Ace,
+}
+
+impl From<char> for CardType {
+    fn from(value: char) -> Self {
+        use CardType::*;
+
+        match value {
+            '2' => Two,
+            '3' => Three,
+            '4' => Four,
+            '5' => Five,
+            '6' => Six,
+            '7' => Seven,
+            '8' => Eight,
+            '9' => Nine,
+            'T' => Joker,
+            'J' => Jack,
+            'Q' => Queen,
+            'K' => King,
+            'A' => Ace,
+            _ => panic!("Invalid card character"),
+        }
+    }
+}
+
+#[derive(Debug, Default)]
+struct Hand {
+    cards: [CardType; 5],
+    bet: usize,
+}
+
+impl Hand {
+    fn parse(line: &str) -> Self {
+        let mut parts = line.split_whitespace();
+        let raw_hand = parts.next().unwrap();
+        let raw_bet = parts.next().unwrap();
+        let cards: [CardType; 5] = raw_hand
+            .trim()
+            .chars()
+            .map(CardType::from)
+            .collect::<Vec<CardType>>()
+            .try_into()
+            .unwrap();
+        let bet = raw_bet.trim().parse::<usize>().unwrap();
+
+        Hand { cards, bet }
+    }
+}
+
+#[derive(Debug, Default, PartialOrd, Ord, PartialEq, Eq)]
+#[repr(u8)]
+enum HandType {
+    #[default]
+    HighCard = 0,
+    OnePair,
+    TwoPair,
+    ThreeOfAKind,
+    FullHouse,
+    FourOfAKind,
+    FiveOfAKind,
+}
+
+impl From<[CardType; 5]> for HandType {
+    fn from(value: [CardType; 5]) -> Self {
+        let mut cards = Vec::from(value);
+        cards.sort_unstable();
+
+        let mut count_map: HashMap<CardType, usize> = HashMap::new();
+        cards.into_iter().for_each(|ct| {
+            match count_map.get(&ct) {
+                Some(count) => count_map.insert(ct, *count + 1),
+                None => count_map.insert(ct, 1),
+            };
+        });
+        let mut card_type_counts: Vec<usize> = count_map.into_values().collect();
+        card_type_counts.sort_unstable();
+
+        match card_type_counts[..] {
+            [5] => FiveOfAKind,
+            [1, 4] => FourOfAKind,
+            [2, 3] => FullHouse,
+            [1, 1, 3] => ThreeOfAKind,
+            [1, 2, 2] => TwoPair,
+            [1, 1, 1, 2] => OnePair,
+            _ => HighCard,
+        }
+    }
+}
+
+type Rank = u16;
+type HandInd = usize;
+
+#[derive(Debug, Default)]
+struct Game {
+    hands: Vec<Hand>,
+    rank: HashMap<Rank, HandInd>,
+}
+
+impl Game {
+    fn parse(input: &str) -> Self {
+        let hands = input
+            .split('\n')
+            .filter(|s| !s.is_empty())
+            .map(Hand::parse)
+            .collect::<Vec<Hand>>();
+
+        Game {
+            hands,
+            ..Default::default()
+        }
+    }
+}
 
 fn main() {
-    println!("Hello, world!");
+    let game = Game::parse(EXAMPLE_FILE_STR);
+    println!("{:#?}", game);
 }
 
 #[cfg(test)]
 mod test {
-    const EXAMPLE_FILE_STR: &str = include_str!("example-input.txt");
-
     use super::*;
-}
\ No newline at end of file
+}