Bingo cards for AoC day 4 not functional yet

advent_of_code/4.rs

@@ -1,7 +1,90 @@
 use std::io::{self, BufRead};
 use std::path::Path;
 use std::fs::File;
+use std::collections::HashMap;
+
+
+// -- PART 1 --
+
+// We playin bingo now
+// Input is first a sequence of integers
+// Followed by a number of bingo cards
+// Goal is to find the bingo card that has bingo first and calculate some metrics of it
+// Metrics are the last called number multiplied by sum of all numbers that were not needed for bingo
+
+struct Card {
+    numbers : HashMap<u64, (usize, usize)>,
+    opens : Vec::<Vec::<bool>>,
+    score : u64,
+}
+
+impl Card {
+    fn new() -> Card {
+        Card { numbers: HashMap::new(), opens: vec![vec![true; 5]; 5], score: 0 }
+    }
+
+    fn call(&mut self, n: u64) -> Option<u64> {
+        let search_result = self.numbers.get(&n);
+
+        match search_result {
+            None => return None,
+            Some(&coords) => return self.take(n, coords),
+        }
+    }
+
+    fn take(&mut self, n: u64, (x, y): (usize, usize)) -> Option<u64> {
+        self.score -= n;
+        self.opens[x][y] = false;
+
+        match self.check((x, y)) {
+            false => return None,
+            true => return Some(self.score),
+        }
+    }
+
+    fn check(&self, (x, y): (usize, usize)) -> bool {
+        for &b in &self.opens[x] {
+            if b {
+                return false;
+            }
+        }
+
+        for i in 0..self.opens.len() {
+            if self.opens[i][y] {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    fn insert(&mut self, n: u64, coords: (usize, usize)) -> () {
+        self.numbers.insert(n, coords);
+        self.score += n;
+    }
+}
 
 fn main(){
+    println!("Advent of Code #4!\n");
 
+    let path = Path::new("./3.txt");
+    let display = path.display();
+
+    let file = match File::open(&path) {
+        Err(why) => panic!("Couldn't open {}: {}", display, why),
+        Ok(file) => file,
+    };
+
+    let lines = io::BufReader::new(file).lines();
+    let mut numbers = Vec::<u8>::new();
+    let mut bingo_cards = Vec::<Card>::new();
+
+    let mut c = Card::new();
+    c.insert(10, (1, 1));
+    let r = c.call(10);
+
+    match r {
+        None => println!("test failed"),
+        Some(t) => println!("test got: {}", t),
+    }
 }