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use async_trait::async_trait;
use rand::{
prelude::{IteratorRandom, SliceRandom},
thread_rng,
};
use crate::{
actions::Bid,
bot::{BiddingBot, PlayingBot},
bridge_engine::{BiddingStatePlayerView, PlayStatePlayerView},
card::Card,
};
pub struct AlwaysPassBiddingBot {}
#[async_trait]
impl BiddingBot for AlwaysPassBiddingBot {
async fn bid(&self, _bidding: &BiddingStatePlayerView) -> Bid {
Bid::Pass
}
}
pub struct RandomPlayingBot {}
#[async_trait]
impl PlayingBot for RandomPlayingBot {
async fn play(&self, state: &PlayStatePlayerView) -> Card {
let mut rng = thread_rng();
if let Some(suit) = state.current_trick.suit() {
if let Some(card) = state
.hand
.iter()
.filter(|c| c.suit() == suit)
.choose(&mut rng)
{
return *card;
}
}
*state
.hand
.choose(&mut rng)
.expect("must have at least one card")
}
}
#[cfg(test)]
mod tests {
use crate::{
bridge_engine::SUIT_DISPLAY_ORDER,
card::RankOrder,
contract::{Contract, ContractLevel, ContractModifier, LevelAndSuit},
core::{Deal, Player, Vulnerability},
move_result::MoveResult,
};
use std::str::FromStr;
use super::*;
use crate::{
bridge_engine::{
Bidding, BiddingState, BiddingStatePlayerView, PlayState,
},
card::Suit,
};
use log::info;
use rand::random;
#[tokio::test]
async fn random_playing_bot() {
crate::tests::test_setup();
let play_state = example_play_state();
info!("Play state: {play_state:#?}");
let south_state =
PlayStatePlayerView::from_play_state(&play_state, Player::South);
assert!(!play_state.playing_deal.is_dummy_visible());
assert!(south_state.dummy.is_none());
assert!(south_state.previous_trick.is_none());
let card1 = (RandomPlayingBot {}).play(&south_state).await;
info!("South state: {south_state:#?}");
let play_state = match play_state.play(card1).unwrap() {
MoveResult::Current(p) => p,
MoveResult::Next(_) => {
panic!("game should not be over")
}
};
let west_state =
PlayStatePlayerView::from_play_state(&play_state, Player::West);
assert!(play_state.playing_deal.is_dummy_visible());
assert!(west_state.dummy.is_some());
let card2 = (RandomPlayingBot {}).play(&west_state).await;
info!("West state: {west_state:#?}");
assert_eq!(card1.suit(), card2.suit());
let _play_state = match play_state.play(card2).unwrap() {
MoveResult::Current(p) => p,
MoveResult::Next(_) => {
panic!("game should not be over")
}
};
}
fn mkcard(s: &str) -> Card {
Card::from_str(s).unwrap()
}
fn mkcards(s: &str) -> Vec<Card> {
s.split(' ').map(mkcard).collect()
}
fn example_deal() -> Deal {
Deal {
dealer: Player::North,
vulnerability: Vulnerability::None,
west: mkcards("♠Q ♠9 ♠5 ♠2 ♥K ♥J ♥4 ♣5 ♣4 ♣2 ♦10 ♦5 ♦3"),
north: mkcards("♠A ♠8 ♠7 ♠6 ♥A ♥9 ♥5 ♥3 ♣9 ♣3 ♦Q ♦J ♦9"),
east: mkcards("♠K ♠3 ♥Q ♥10 ♥8 ♥7 ♣K ♣Q ♣J ♣10 ♣6 ♦A ♦4"),
south: mkcards("♠J ♠10 ♠4 ♥6 ♥2 ♣A ♣8 ♣7 ♦K ♦8 ♦7 ♦6 ♦2"),
}
}
fn example_play_state() -> PlayState {
let deal = example_deal();
let raise1c = LevelAndSuit {
level: ContractLevel::One,
suit: Some(Suit::Club),
};
let contract = Contract {
declarer: Player::West,
highest_bid: raise1c,
modifier: ContractModifier::Doubled,
};
let bidding = Bidding {
dealer: deal.dealer,
bids: vec![Bid::Raise(raise1c), Bid::Pass, Bid::Pass, Bid::Pass],
};
PlayState::new(deal, contract, bidding)
}
#[tokio::test]
async fn always_passing_bot_passes() {
crate::tests::test_setup();
let deal: Deal = random();
let dealer = deal.dealer;
let player_position = random();
let bidding_state = BiddingState {
deal,
bidding: Bidding::new(dealer),
};
let player_view = BiddingStatePlayerView::from_bidding_state(
&bidding_state,
player_position,
);
info!("Bidding state: {bidding_state:#?}");
assert_eq!(
Bid::Pass,
(AlwaysPassBiddingBot {}).bid(&player_view).await
);
}
#[tokio::test]
async fn play_until_completion() {
crate::tests::test_setup();
let bot = RandomPlayingBot {};
let play_state = example_play_state();
let mut deal = play_state.deal.clone();
let mut result = MoveResult::Current(play_state);
while let MoveResult::Current(play_state) = result {
info!("Play state: {play_state:#?}");
let player_state = PlayStatePlayerView::from_play_state(
&play_state,
play_state.current_player(),
);
let card = bot.play(&player_state).await;
result = play_state.play(card).unwrap();
}
let play_result = result.next().unwrap();
// Verify that the deal is intact.
deal.sort(&SUIT_DISPLAY_ORDER, RankOrder::Descending);
let mut result_deal = play_result.deal().into_owned();
result_deal.sort(&SUIT_DISPLAY_ORDER, RankOrder::Descending);
assert_eq!(result_deal, deal);
}
}
|
