use anyhow::{anyhow, Result};
use std::fs;

pub fn run() -> Result<()> {
    #[cfg(not(feature = "test_input"))]
    let file_contents = fs::read_to_string("day10.txt")?;

    #[cfg(feature = "test_input")]
    let file_contents = fs::read_to_string("tests/day10.txt")?;

    let mut regx: Vec<i32> = Vec::with_capacity(250);
    regx.push(1);

    for line in file_contents.lines() {
        regx.push(0);
        match &line[0..4] {
            "noop" => {}
            "addx" => {
                let count: i32 = line[5..].parse().expect("invalid numeric value");
                regx.push(count);
            }
            _ => {
                return Err(anyhow!("unknown op code"));
            }
        }
    }

    let sum_20: i32 = regx.iter().take(20).sum();
    let sum_60: i32 = regx.iter().take(60).sum();
    let sum_100: i32 = regx.iter().take(100).sum();
    let sum_140: i32 = regx.iter().take(140).sum();
    let sum_180: i32 = regx.iter().take(180).sum();
    let sum_220: i32 = regx.iter().take(220).sum();
    let part1 =
        sum_20 * 20 + sum_60 * 60 + sum_100 * 100 + sum_140 * 140 + sum_180 * 180 + sum_220 * 220;

    println!("part1 {}", part1);

    let mut cycle = 0;
    let mut sprite = 1;
    for reg_val in regx.iter().skip(1) {
        if cycle > 0 && cycle % 40 == 0 {
            println!();
        }
        if sprite >= (cycle % 40) - 1 && sprite <= (cycle % 40) + 1 {
            print!("#");
        } else {
            print!(".");
        }
        sprite += reg_val;

        cycle += 1;
    }
    println!();

    Ok(())
}