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use super::traits::{Game, GameError, GamePhase, GameResult, GameState};
use rand::Rng;
use std::collections::HashMap;
pub struct SlotsGame {
symbols: Vec<char>,
payouts: HashMap<String, u64>,
/// Deterministic reels for tests and demos.
fixed_reels: Option<Vec<char>>,
}
impl SlotsGame {
pub fn new() -> Self {
let symbols = vec!['C', 'L', 'O', 'G', 'D', 'S'];
let mut payouts = HashMap::new();
// Balanced payouts: EV = 210/216 ≈ 0.972 (2.8% house edge)
payouts.insert("CCC".to_string(), 2);
payouts.insert("LLL".to_string(), 3);
payouts.insert("OOO".to_string(), 5);
payouts.insert("GGG".to_string(), 8);
payouts.insert("DDD".to_string(), 14);
payouts.insert("SSS".to_string(), 28);
payouts.insert("CC".to_string(), 1);
payouts.insert("LL".to_string(), 1);
payouts.insert("OO".to_string(), 1);
payouts.insert("GG".to_string(), 2);
payouts.insert("DD".to_string(), 2);
payouts.insert("SS".to_string(), 3);
Self {
symbols,
payouts,
fixed_reels: None,
}
}
/// Build a slots game that always spins the given three symbols.
pub fn with_reels(reels: &str) -> Self {
let mut game = Self::new();
game.fixed_reels = Some(reels.chars().take(3).collect());
game
}
fn spin_reels(&self) -> Vec<char> {
if let Some(reels) = &self.fixed_reels {
return reels.clone();
}
let mut rng = rand::thread_rng();
(0..3)
.map(|_| self.symbols[rng.gen_range(0..self.symbols.len())])
.collect()
}
pub fn calculate_payout(&self, reels: &[char], bet: u64) -> u64 {
let reel_string: String = reels.iter().collect();
if let Some(&multiplier) = self.payouts.get(&reel_string) {
return bet.saturating_mul(multiplier);
}
// Check all three pairs including non-adjacent (e.g. [C,D,C])
let pairs: [(usize, usize); 3] = [(0, 1), (1, 2), (0, 2)];
let mut best: u64 = 0;
for &(a, b) in &pairs {
if reels[a] == reels[b] {
let two_of_kind = format!("{}{}", reels[a], reels[a]);
if let Some(&multiplier) = self.payouts.get(&two_of_kind) {
best = best.max(bet.saturating_mul(multiplier));
}
}
}
best
}
}
impl Game for SlotsGame {
fn game_type(&self) -> &'static str {
"slots"
}
fn get_name(&self) -> &'static str {
"Slots"
}
fn get_description(&self) -> &'static str {
"Spin the reels and match symbols to win!"
}
fn prepare_state(&self, username: &str, bet_amount: u64) -> GameState {
let mut data = HashMap::new();
data.insert("username".to_string(), username.to_string());
data.insert("status".to_string(), "ready".to_string());
GameState {
session_id: String::new(),
game_type: "slots".to_string(),
bet_amount,
phase: GamePhase::WaitingToStart,
data,
}
}
fn process_action(
&self,
state: &GameState,
action: &str,
_params: &[&str],
) -> Result<GameState, GameError> {
if state.phase == GamePhase::Finished {
return Err(GameError::GameOver);
}
match action {
"spin" => {
if state.phase != GamePhase::WaitingToStart && state.phase != GamePhase::Playing {
return Err(GameError::InvalidAction(
"Cannot spin in current phase".to_string(),
));
}
let reels = self.spin_reels();
let reel_string: String = reels.iter().collect();
let mut new_data = state.data.clone();
new_data.insert("reels".to_string(), reel_string.clone());
new_data.insert("status".to_string(), "spun".to_string());
let is_jackpot = reels[0] == reels[1] && reels[1] == reels[2];
let is_two = reels[0] == reels[1] || reels[1] == reels[2] || reels[0] == reels[2];
new_data.insert(
"win_type".to_string(),
if is_jackpot {
"jackpot".to_string()
} else if is_two {
"two".to_string()
} else {
"none".to_string()
},
);
Ok(GameState {
session_id: state.session_id.clone(),
game_type: state.game_type.clone(),
bet_amount: state.bet_amount,
phase: GamePhase::Finished,
data: new_data,
})
}
_ => Err(GameError::InvalidAction(format!(
"Unknown action: {}",
action
))),
}
}
fn calculate_result(&self, state: &GameState) -> Result<GameResult, GameError> {
if state.phase != GamePhase::Finished {
return Err(GameError::InternalError("Game not finished".to_string()));
}
let reel_string = state
.data
.get("reels")
.ok_or(GameError::InternalError("No reels found".to_string()))?;
let reels: Vec<char> = reel_string.chars().collect();
let winnings = self.calculate_payout(&reels, state.bet_amount);
let mut result_data = HashMap::new();
result_data.insert("reels".to_string(), reel_string.clone());
result_data.insert(
"payout_multiplier".to_string(),
if winnings > 0 && state.bet_amount > 0 {
(winnings / state.bet_amount).to_string()
} else {
"0".to_string()
},
);
result_data.insert(
"win_type".to_string(),
state.data.get("win_type").cloned().unwrap_or_default(),
);
Ok(GameResult {
session_id: state.session_id.clone(),
game_type: state.game_type.clone(),
bet_amount: state.bet_amount,
winnings,
final_balance: 0,
result_data,
})
}
}
|
