use aoc_runner_derive::{aoc, aoc_generator};

#[aoc_generator(day17)]
fn parse(input: &str) -> Vec<u32> {
    input.lines().map(|line| line.parse().unwrap()).collect()
}

#[aoc(day17, part1)]
fn part1(input: &[u32]) -> usize {
    bar(input, 150)
}

fn bar(containers: &[u32], target: u32) -> usize {
    baz(containers, target, 0)
}

fn baz(containers: &[u32], target: u32, filled: u32) -> usize {
    if filled > target {
        return 0;
    } else if filled == target {
        return 1;
    } else if containers.len() == 0 {
        return 0;
    }

    baz(&containers[1..], target, filled + containers[0])
        + baz(&containers[1..], target, filled)
}

#[aoc(day17, part2)]
fn part2(_input: &[u32]) -> usize {
    0
}

#[cfg(test)]
mod test {
    use crate::day17::bar;

    #[test]
    fn part1() {
        assert_eq!(bar(&[20, 15, 10, 5, 5], 25), 4)
    }
}