use nom::{
    branch::alt,
    character::complete::{char, line_ending},
    combinator::{map, value},
    multi::{many1, separated_list1},
    IResult,
};
use std::fs;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let input = fs::read_to_string("inputs/day_23.txt")?;
    let parsed = ForestMap::parser(&input).unwrap().1;
    dbg!(&parsed);

    Ok(())
}

#[derive(Debug)]
struct ForestMap(Vec<Vec<ForestTile>>);

#[derive(Debug, Clone)]
enum ForestTile {
    Wall,
    Open,
    SlopeUp,
    SlopeDown,
    SlopeLeft,
    SlopeRight,
}

impl ForestMap {
    fn parser(input: &str) -> IResult<&str, Self> {
        map(
            separated_list1(line_ending, many1(ForestTile::parser)),
            ForestMap,
        )(input)
    }
}

impl ForestTile {
    fn parser(input: &str) -> IResult<&str, Self> {
        alt((
            value(ForestTile::Wall, char('#')),
            value(ForestTile::Open, char('.')),
            value(ForestTile::SlopeUp, char('^')),
            value(ForestTile::SlopeDown, char('v')),
            value(ForestTile::SlopeLeft, char('<')),
            value(ForestTile::SlopeRight, char('>')),
        ))(input)
    }
}