110 lines
2.4 KiB
Rust
110 lines
2.4 KiB
Rust
#[derive(Clone, Copy, PartialEq)]
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pub enum Cell {
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Empty,
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X,
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O,
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}
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pub struct Move {
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pub x: usize,
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pub y: usize,
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pub piece: Cell,
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}
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pub struct Board {
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cells: Vec<Cell>,
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next: Cell,
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}
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impl Board {
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pub fn new() -> Board {
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Board {
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cells: vec![Cell::Empty; 9],
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next: Cell::X,
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}
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}
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pub fn reset(&mut self) {
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self.cells = vec![Cell::Empty; 9];
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self.next = Cell::X;
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}
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pub fn apply(&mut self, m: Move) -> Result<(), &str> {
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if !self.is_valid_move(&m) {
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return Err("invalid move");
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}
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let i = m.x * 1 + m.y * 3;
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self.cells[i] = m.piece;
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match self.next {
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Cell::X => self.next = Cell::O,
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Cell::O => self.next = Cell::X,
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_ => {}
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}
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Ok(())
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}
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pub fn is_valid_move(&self, m: &Move) -> bool {
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if m.x > 2 || m.y > 2 {
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return false;
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}
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let i = m.x * 1 + m.y * 3;
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m.piece == self.next && self.cells[i] == Cell::Empty
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}
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pub fn valid_moves_available(&self) -> bool {
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// check for draw condition
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for i in 0..self.cells.len() {
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if self.cells[i] == Cell::Empty {
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return true;
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}
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}
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return false;
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}
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pub fn has_winner(&self) -> Option<Cell> {
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// rows and cols
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for i in 0..3 {
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if (self.cells[i] != Cell::Empty)
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&& (self.cells[i] == self.cells[i + 3] && self.cells[i] == self.cells[i + 6])
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{
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return Some(self.cells[i]);
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} else if (self.cells[i * 3] != Cell::Empty)
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&& (self.cells[i * 3] == self.cells[i * 3 + 1]
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&& self.cells[i * 3] == self.cells[i * 3 + 2])
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{
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return Some(self.cells[i * 3]);
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}
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}
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// diagonals
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if (self.cells[0] != Cell::Empty)
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&& (self.cells[0] == self.cells[4] && self.cells[0] == self.cells[8])
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{
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return Some(self.cells[0]);
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}
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if (self.cells[2] != Cell::Empty)
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&& (self.cells[2] == self.cells[4] && self.cells[2] == self.cells[6])
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{
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return Some(self.cells[2]);
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}
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// no winner
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return None;
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}
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pub fn cells(&self) -> Vec<Cell> {
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self.cells.clone()
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}
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pub fn next_move(&self) -> Cell {
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self.next
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}
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}
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