Add utility functions for readability and refactor make_move

src/board/state.rs

@@ -3,10 +3,10 @@ use crate::{board::board::Color, movegen::r#move::MoveType};
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
 pub struct State {
     side_to_move: Color,
-    castling_ability: [Castle; 2],
-    en_passant_target_square: Option<usize>,
-    halfmove_clock: u8,
-    fullmove_counter: u8,
+    pub castling_ability: [Castle; 2],
+    pub en_passant_target_square: Option<usize>,
+    pub halfmove_clock: u8,
+    pub fullmove_counter: u8,
 }
 
 impl State {
@@ -40,6 +40,17 @@ impl State {
         self.en_passant_target_square
     }
 
+    pub fn set_en_passant_target_square(&mut self, square: Option<usize>) {
+        self.en_passant_target_square = square;
+    }
+
+    pub const fn castling_ability(&self, color: Color) -> Castle {
+        match color {
+            Color::White => self.castling_ability[0],
+            Color::Black => self.castling_ability[1],
+        }
+    }
+
     pub fn set_castling_ability(&mut self, color: Color, castle: Castle) {
         match color {
             Color::White => self.castling_ability[0] = castle,
@@ -95,26 +106,23 @@ impl State {
         }
     }
 
-    pub fn change_side(&mut self) {
+    pub fn revert_full_move(&mut self, color: Color) {
+        match color {
+            Color::White => (),
+            Color::Black => self.fullmove_counter -= 1,
+        }
+    }
+
+    pub fn change_side(&mut self) -> Color {
         self.side_to_move = match self.side_to_move {
             Color::White => Color::Black,
             Color::Black => Color::White,
-        }
-    }
-
-    pub const fn next_turn(&self) -> Color {
+        };
         self.side_to_move
     }
 
-    pub fn set_en_passant_target_square(&mut self, square: Option<usize>) {
-        self.en_passant_target_square = square;
-    }
-
-    pub const fn castling_ability(&self, color: Color) -> Castle {
-        match color {
-            Color::White => self.castling_ability[0],
-            Color::Black => self.castling_ability[1],
-        }
+    pub const fn current_player(&self) -> Color {
+        self.side_to_move
     }
 }