use std::error;
use std::fs::File;
use std::io::BufRead;
use std::io::BufReader;

const DEBUG: bool = false;

fn main() -> Result<(), Box<dyn error::Error>> {
	let f = File::open("input.txt")?;
	let reader = BufReader::new(f);

	let mut strength = 1;
	let mut cycle = 0;
	let mut lines = String::from("");
	for line in reader.lines() {
		let line = line?;
		let mut split_iter = line.split_whitespace();
		let cmd = split_iter.next().ok_or("asdf")?;
		if DEBUG {
			println!("{} {}", cycle, strength);
		}
		match cmd {
			"noop" => {
				if (strength - 1) <= cycle && (strength + 1) >= cycle {
					lines += "#";
				} else {
					lines += ".";
				}
				cycle += 1;
				if (cycle % 40) == 0 {
					lines += "\n";
					cycle = 0;
				}
				if DEBUG {
					println!("{} {}", cycle, strength);
				}
			},
			"addx" => {
				if (strength - 1) <= cycle && (strength + 1) >= cycle {
					lines += "#";
				} else {
					lines += ".";
				}
				cycle += 1;
				if (cycle % 40) == 0 {
					lines += "\n";
					cycle = 0;
				}
				if (strength - 1) <= cycle && (strength + 1) >= cycle {
					lines += "#";
				} else {
					lines += ".";
				}
				cycle += 1;
				let num: i32 = split_iter.next().ok_or("bla")?.parse()?;
				if (cycle % 40) == 0 {
					lines += "\n";
					cycle = 0;
				}
				strength += num;
			},
			_ => Err(format!("Unknown command: {}", cmd))?
		};
	}

    println!("{lines}");
    Ok(())
}