use std::collections::VecDeque;
use std::fs::File;
use std::io::{BufRead, BufReader};
use std::ops::Range;

const MapSize: usize = 1800;
type Map = [[char; MapSize]; MapSize];

fn find_range_in_line(line: &str) -> (Range<u16>, Range<u16>) {
    let mut parts = line.split(", ");
    let mut left_parts = parts.nth(0).unwrap().split("=");
    let left_coord_type: &str = left_parts.nth(0).unwrap();
    let left_number: u16 = left_parts.nth(0).unwrap().parse().unwrap();
    let mut right_parts = parts.nth(0).unwrap().split("=");
    let mut right_numbers = right_parts.nth(1).unwrap().split("..");
    let right_number_1: u16 = right_numbers.nth(0).unwrap().parse().unwrap();
    let right_number_2: u16 = right_numbers.nth(0).unwrap().parse().unwrap();
    let left_range = Range { start: left_number, end: left_number + 1 };
    let right_range = Range { start: right_number_1, end: right_number_2 + 1 };
    if left_coord_type == "x" {
        (left_range, right_range)
    } else {
        (right_range, left_range)
    }
}

fn build_map_from_file(filename: &str) -> Map {
    let lines: Vec<String> = BufReader::new(File::open(filename).unwrap())
        .lines()
        .map(|line| line.unwrap())
        .collect();
    let mut min_y = MapSize;
    let mut max_y = 0;
    let mut m: Map = [[' '; MapSize]; MapSize];
    m[500][0] = '+';
    for line in lines.iter() {
        let (x_range, y_range) = find_range_in_line(line.as_str());
    }
    m
}

fn main() {
}

#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn test_range_from_line() {
        let line = "x=100, y=100..102";
        let (x_range, y_range) = find_range_in_line(line);
        assert_eq!(x_range, (100..101));
        assert_eq!(y_range, (100..103));
    }
}