use std::io;
use std::vec::Vec;

use crate::utils;

struct Assignment {
    min: u32,
    max: u32,
}

pub fn execute() -> Result<(), io::Error> {
    let mut subsets = 0;
    let mut overlaps = 0;

    for line in utils::read_lines("input/day04.txt")? {
        let text = line?;
        let inputs: Vec<_> = text.split(',').collect();
        let ass1 = parse_assignment(inputs[0]);
        let ass2 = parse_assignment(inputs[1]);

        if (ass2.max >= ass1.max && ass2.min <= ass1.min) ||
           (ass1.max >= ass2.max && ass1.min <= ass2.min) {
            subsets += 1;
        }

        if (ass2.max >= ass1.min && ass2.min <= ass1.max) ||
           (ass1.max >= ass2.min && ass1.min <= ass2.max) {
            overlaps += 1;
        }
    }

    utils::print_step(1, subsets);
    utils::print_step(2, overlaps);
    Ok(())
}

fn parse_assignment(input: &str) -> Assignment {
    let values: Vec<_> = input.split('-').collect();

    let Ok(min) = values[0].parse::<u32>() else {
        panic!("Min value {} is non-numeric.", values[0])
    };

    let Ok(max) = values[1].parse::<u32>() else {
        panic!("Max value {} is non-numeric.", values[1])
    };

    Assignment {
        min: min,
        max: max,
    }
}