Add State struct as part of Board struct

src/board.rs

@@ -5,11 +5,13 @@ use crate::attack::{
     get_bishop_attacks, get_king_attacks, get_knight_attacks, get_pawn_attacks, get_queen_attacks,
     get_rook_attacks,
 };
+use crate::game::State;
 
 #[derive(Debug, PartialEq, Eq)]
 pub struct Board {
-    white_pieces: [Piece; 6],
-    black_pieces: [Piece; 6],
+    pub white_pieces: [Piece; 6],
+    pub black_pieces: [Piece; 6],
+    pub state: State,
 }
 
 impl Board {
@@ -31,6 +33,7 @@ impl Board {
                 Piece::new(0x800000000000000, Kind::Queen, Color::Black),
                 Piece::new(0x1000000000000000, Kind::King, Color::Black),
             ],
+            state: State::new(),
         }
     }
 
@@ -52,6 +55,7 @@ impl Board {
                 Piece::new(0x0, Kind::Queen, Color::Black),
                 Piece::new(0x0, Kind::King, Color::Black),
             ],
+            state: State::new(),
         }
     }
 
@@ -62,11 +66,20 @@ impl Board {
         };
     }
 
-    pub fn get_all_occupancies(&self) -> Bitboard {
-        let white_blockers = self.white_pieces.iter().fold(0, |acc, p| p.bitboard | acc);
-        let black_blockers = self.black_pieces.iter().fold(0, |acc, p| p.bitboard | acc);
+    pub fn set_state(&mut self, state: State) {
+        self.state = state;
+    }
 
-        white_blockers | black_blockers
+    pub fn get_white_occupancies(&self) -> Bitboard {
+        self.white_pieces.iter().fold(0, |acc, p| p.bitboard | acc)
+    }
+
+    pub fn get_black_occupancies(&self) -> Bitboard {
+        self.black_pieces.iter().fold(0, |acc, p| p.bitboard | acc)
+    }
+
+    pub fn get_all_occupancies(&self) -> Bitboard {
+        self.get_white_occupancies() | self.get_black_occupancies()
     }
 
     pub fn is_attacked(&self, sq: usize, opponent_color: Color) -> bool {