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#[derive(Debug, PartialEq)]
pub enum Error {
NotEnoughPinsLeft,
GameComplete,
}
#[derive(Debug, Default)]
pub struct BowlingGame {
throws: Vec<u16>,
prev: u16
}
impl BowlingGame {
pub fn new() -> Self {
Default::default()
}
pub fn roll(&mut self, pins: u16) -> Result<(), Error> {
if pins + self.prev > 10 {
Err(Error::NotEnoughPinsLeft)
} else if self.score().is_some() {
Err(Error::GameComplete)
} else {
self.throws.push(pins);
self.prev = if self.prev + pins == 10 { 0 } else { pins };
Ok(())
}
}
pub fn score(&self) -> Option<u16> {
let mut score = 0;
let mut stage = 0;
for _ in 1..=10 {
let first = self.throws.get(stage)?;
let second = self.throws.get(stage+1)?;
score += first + second;
if first + second >= 10 {
let third = self.throws.get(stage+2)?;
score += third;
}
stage += if *first == 10 { 1 } else { 2 };
}
Some(score)
}
}
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