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//! Shared slots rules used by both the server engine and the client board.
pub const REELS: usize = 5;
pub const ROWS: usize = 3;
pub const SYMBOLS: [char; 6] = ['C', 'L', 'O', 'G', 'D', 'S'];
/// Five paylines, each entry is the row used on reel 0..4.
pub const PAYLINES: [[usize; REELS]; 5] = [
[0, 0, 0, 0, 0], // line 1: top
[1, 1, 1, 1, 1], // line 2: middle
[2, 2, 2, 2, 2], // line 3: bottom
[0, 1, 2, 1, 0], // line 4: V
[2, 1, 0, 1, 2], // line 5: inverted V
];
/// (symbol, 3-of-a-kind, 4-of-a-kind, 5-of-a-kind) multipliers of total bet.
pub const PAYTABLE: [(char, u64, u64, u64); 6] = [
('C', 2, 5, 15),
('L', 3, 7, 20),
('O', 3, 8, 25),
('G', 4, 12, 40),
('D', 6, 18, 70),
('S', 9, 30, 150),
];
/// One-line paytable rendered under the reels.
pub fn paytable_line() -> String {
let entries: Vec<String> = PAYTABLE
.iter()
.map(|(symbol, three, four, five)| format!("{symbol} {three}/{four}/{five}"))
.collect();
format!("Pays 3/4/5 x bet: {}", entries.join(" "))
}
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