use aoc22::{day7, util};

const TOTAL_SPACE: usize = 70000000;
const REQUIRED_SPACE: usize = 30000000;

pub fn main() {
    let root = day7::parse_cmdline(&util::parse_input());

    let r = &*root.borrow();
    let free_space = TOTAL_SPACE - r.size();
    assert!(free_space < REQUIRED_SPACE);
    let required_deletion = REQUIRED_SPACE - free_space;

    let mut min_sufficient = usize::MAX;
    for child in root.borrow().all_children() {
        let c = &*child.borrow();
        if let day7::Node::Dir { .. } = c {
            let size = c.size();
            if size >= required_deletion && size <= min_sufficient {
                min_sufficient = size;
            }
        }
    }

    println!("Size of min sufficient dir is {}", min_sufficient);
}