gammon/src/main.rs

use std::default::Default;
use std::fmt;
use std::fmt::Display;

#[derive(Debug,Clone,Copy,Eq,PartialEq)]
pub enum Side {
    Black = 0,
    White = 1,
}

#[derive(Debug,Clone,Copy)]
pub enum Phase {
    PickSides,
    Turn(Side),
}

#[derive(Debug,Clone,Default)]
pub struct Player {
    pub born_off: u32,
    pub on_bar: u32,
}

#[derive(Debug,Clone,Copy)]
pub enum Bin {
    Empty,
    Black(u32),
    White(u32),
}

#[derive(Debug)]
pub struct Game {
    pub phase : Phase,
    pub multiplier : u32,
    pub roll : [u8; 2],
    pub players : [Player; 2],
    pub bins : [Bin; 24],
}

impl Default for Game {
    fn default() -> Self {
        Game {
            phase: Phase::PickSides,
            multiplier: 1,
            roll: [0; 2],
            players: [
                Player::default(),
                Player::default(),
            ],
            bins: [Bin::Empty; 24],
        }
    }
}

impl Display for Game {
    fn fmt(&self, f : &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, " ")?;
        for n in (13..=24) { write!(f, " {:2}", n)?; }
        write!(f, "\n╭")?;

        for b in &self.bins[12..=23] {
            match *b {
                Bin::Empty => write!(f, " ┈┈")?,
                Bin::Black(n) => write!(f, "{:2}#", n)?,
                Bin::White(n) => write!(f, "{:2}:", n)?
            }
        }
        write!(f, " > {}:\n╰", self.players[Side::Black as usize].born_off)?;

        for b in (&self.bins[0..=11]).iter().rev() {
            match *b {
                Bin::Empty => write!(f, " ┈┈")?,
                Bin::Black(n) => write!(f, "{:2}#", n)?, //█
                Bin::White(n) => write!(f, "{:2}:", n)? //░
            }
        }

        write!(f, " > {}#\n ", self.players[Side::Black as usize].born_off)?;
        for n in (1..=12).rev() { write!(f, " {:2}", n)?; }
        write!(f, "\n")?;

        Ok(())
    }
}

impl Game {
    fn clear(&mut self) {
        for i in 0..24 {
            self.bins[i] = Bin::Empty;
        }
    }

    fn set(&mut self, n : u32, val : Bin) {
        assert!(n > 0 && n <= 24);
        let i = n - 1;
        self.bins[i as usize] = val;
    }

    fn starting_position(&mut self) {
        self.clear();
        self.set(1, Bin::White(2));
        self.set(6, Bin::Black(5));
        self.set(8, Bin::Black(3));
        self.set(12, Bin::White(5));
        self.set(13, Bin::Black(5));
        self.set(17, Bin::White(3));
        self.set(19, Bin::White(5));
        self.set(24, Bin::Black(2));
    }
}

fn main() {
    let mut board = Game::default();
    
    board.starting_position();

    println!("{}", board);


}