add check for draw

engine/engine.rs

@@ -27,8 +27,8 @@ impl Engine {
     pub fn run(&mut self) -> Result<(), Box<dyn std::error::Error>> {
         loop {
             // setup new game for players
-            self.players[self.x].start_new_game(Cell::CellX)?;
-            self.players[(self.x + 1) % 2].start_new_game(Cell::CellO)?;
+            self.players[self.x].start_new_game(Cell::X)?;
+            self.players[(self.x + 1) % 2].start_new_game(Cell::O)?;
 
             // reset board
             self.board.reset();
@@ -46,6 +46,7 @@ impl Engine {
         loop {
             println!("{}", self.board);
 
+            // request move from player, fail if there is error
             let m = self.players[self.turn].request_move(&self.board)?;
 
             if !self.board.is_valid_move(&m) {
@@ -53,14 +54,21 @@ impl Engine {
                 continue;
             }
 
-            self.board.put(m)?;
+            // apply move
+            self.board.apply(m)?;
 
+            // check if there is a winner
             if let Some(_winner) = self.board.has_winner() {
                 println!("{}", self.board);
                 println!("The winner is: {}", self.players[self.turn].name());
                 break;
             }
 
+            if !self.board.valid_moves_available() {
+                println!("{}", self.board);
+                break;
+            }
+
             self.turn = (self.turn + 1) % 2
         }