use crate::common::interval::MultiInterval;
use crate::solvers::Solver;
use std::io::BufRead;

pub struct Cafeteria {}

impl Solver for Cafeteria {
    const PUZZLE_INDEX: u8 = 5;
    const PUZZLE_NAME: &'static str = "Cafeteria";

    fn process_data<R: BufRead>(&self, mut reader: R) -> (u64, u64) {
        // Builds intervals collection.
        let mut intervals = MultiInterval::new();
        for line in reader
            .by_ref()
            .lines()
            .map_while(|x| x.ok().filter(|s| !s.is_empty()))
        {
            intervals.add(line.parse().unwrap());
        }

        // Tests values against intervals.
        let fresh_count = reader
            .lines()
            .map_while(|x| x.ok()?.parse::<u64>().ok())
            .filter(|&value| intervals.contains(value))
            .count() as u64;

        (fresh_count, intervals.len())
    }
}