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),
    }
}