94 lines
2.5 KiB
Rust
94 lines
2.5 KiB
Rust
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pub mod errors;
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use rand::prelude::*;
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use std::fmt::Display;
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use crate::card::Card;
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use crate::card::consts::{DECK, CARDS_PER_PLAYER};
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use errors::{MakeGameError, PlayError};
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#[derive(Debug, Clone)]
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pub struct Game {
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played: Vec<Card>,
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deck: Vec<Card>,
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players: Vec<Vec<Card>>,
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}
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impl Game {
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pub fn new(decks: usize, players: usize) -> Result<Self, MakeGameError> {
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const TOP_CARD: usize = 1;
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if players * CARDS_PER_PLAYER + TOP_CARD >= DECK.len() * decks {
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return Err(MakeGameError::InsufficientCards);
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}
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let mut deck = DECK.to_vec().repeat(decks);
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let mut rng = thread_rng();
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deck.shuffle(&mut rng);
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let mut players = vec![ Vec::with_capacity(7); players ];
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for p in &mut players {
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let range = deck.len()-CARDS_PER_PLAYER .. deck.len();
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let iter = deck.drain(range);
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p.extend(iter);
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}
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// safety: this will always be safe because we checked ahead of time
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// if there were enough cards
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let top_card = unsafe { deck.pop().unwrap_unchecked() };
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let played = vec![top_card];
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Ok(Self {
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played,
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deck,
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players,
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})
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}
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pub fn play(&mut self, player: usize, cards: &[Card]) -> Result<(), PlayError> {
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let player = self.players.get_mut(player).ok_or(PlayError::NoSuchPlayer)?;
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let o_len = player.len();
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player.retain(|card| !cards.contains(card));
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if o_len - player.len() == cards.len() {
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Ok(())
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} else {
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Err(PlayError::PlayerDoesNotHaveCard)
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}
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}
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}
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impl Display for Game {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let join_cards_by_spaces = |cards: &[Card]| join_formatted(cards, ToString::to_string, " ");
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let played = join_cards_by_spaces(&self.played);
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let deck = join_cards_by_spaces(&self.deck);
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let players = join_formatted(
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(1..).zip(&self.players),
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|(i, v)| format!("{i}: {}", join_cards_by_spaces(v)),
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"\n"
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);
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write!(f, "played: {played}\ndeck: {deck}\nplayers:\n{players}")
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}
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}
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fn join_formatted<I, F>(iter: I, f: F, sep: &str) -> String
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where
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I: IntoIterator,
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F: FnMut(I::Item) -> String,
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{
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iter.into_iter()
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.map(f)
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.reduce(|acc, s| acc + sep + &s)
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.unwrap_or_default()
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}
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pub enum Message {
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PlayCards(usize, Vec<Card>)
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}
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