use std::io;

pub fn get_calibration_digits() -> u32 {
  let mut buffer = String::new();
  let mut sum = 0;
  while io::stdin().read_line(&mut buffer).unwrap() > 0 {
    let nums: Vec<u32> = buffer.chars().filter_map(|c| c.to_digit(10)).collect();
    sum += nums.first().unwrap() * 10 + nums.last().unwrap();
    buffer = String::new();
  }
  sum
}

const NUMBERS: [&'static str; 9] = [
  "one", "two", "three", "four", "five", "six", "seven", "eight", "nine",
];

enum SearchDir {
  First,
  Last,
}

fn get_digit(line: &String, dir: SearchDir) -> u32 {
  let mut first: usize = 0;
  let mut index: Option<usize> = None;
  for n in 1..=9 {
    let f = match &dir {
      SearchDir::First => line.find(&n.to_string()),
      SearchDir::Last => line.rfind(&n.to_string()),
    };
    if f == None {
      continue;
    }
    let found = f.unwrap();
    match index {
      None => {
        index = f;
        first = n;
      }
      Some(i) => match &dir {
        SearchDir::First => {
          if found < i {
            index = f;
            first = n;
          }
        }
        SearchDir::Last => {
          if found > i {
            index = f;
            first = n;
          }
        }
      },
    }
  }
  for (num, num_str) in NUMBERS.iter().enumerate() {
    let f = match &dir {
      SearchDir::First => line.find(num_str),
      SearchDir::Last => line.rfind(num_str),
    };
    if f == None {
      continue;
    }
    let found = f.unwrap();
    match index {
      None => {
        index = f;
        first = num + 1;
      }
      Some(i) => match &dir {
        SearchDir::First => {
          if found < i {
            index = f;
            first = num + 1;
          }
        }
        SearchDir::Last => {
          if found > i {
            index = f;
            first = num + 1;
          }
        }
      },
    }
  }
  first.try_into().unwrap()
}

pub fn get_calibration_digits_alnum() -> u32 {
  let mut buffer = String::new();
  let mut sum = 0;
  while io::stdin().read_line(&mut buffer).unwrap() > 0 {
    let val = (get_digit(&buffer, SearchDir::First) * 10) + get_digit(&buffer, SearchDir::Last);
    sum += val;
    buffer = String::new();
  }
  sum
}