From 93461aa9399d981db7d8611b3eb166636de4d971 Mon Sep 17 00:00:00 2001
From: Micha White <botahamec@outlook.com>
Date: Fri, 29 Dec 2023 00:05:43 -0500
Subject: BIG BUG: board didn't require double jumps to use same piece

---
 model/src/board.rs | 31 +++++++++++++++++++++++++++----
 1 file changed, 27 insertions(+), 4 deletions(-)

(limited to 'model/src/board.rs')

diff --git a/model/src/board.rs b/model/src/board.rs
index 52d2b44..b722fd6 100644
--- a/model/src/board.rs
+++ b/model/src/board.rs
@@ -30,6 +30,10 @@ pub struct CheckersBitBoard {
 	pub kings: u32,
 	/// The player who has the next turn
 	pub turn: PieceColor,
+	/// The player with the previous turn
+	pub previous_turn: PieceColor,
+	/// Where the most recent move was to
+	pub previous_move_to: u8,
 }
 
 impl Default for CheckersBitBoard {
@@ -83,6 +87,9 @@ impl CheckersBitBoard {
 			color,
 			kings,
 			turn,
+			previous_turn: turn.flip(),
+			// this field is only used if previous_turn == turn
+			previous_move_to: 0,
 		}
 	}
 
@@ -330,6 +337,18 @@ impl CheckersBitBoard {
 		CheckersBitBoard::new(self.pieces, self.color, self.kings, self.turn.flip())
 	}
 
+	/// Change whose turn it was previously to the current player
+	pub const fn set_previous_turn(self, dest: usize) -> Self {
+		CheckersBitBoard {
+			pieces: self.pieces,
+			color: self.color,
+			kings: self.kings,
+			turn: self.turn,
+			previous_turn: self.turn,
+			previous_move_to: dest as u8,
+		}
+	}
+
 	/// Moves a piece from `start` to `dest`. The original location will be empty.
 	/// This does not mutate the original board.
 	/// If a piece already exists at `dest`, it will be overwritten.
@@ -543,7 +562,7 @@ impl CheckersBitBoard {
 		if (is_king || (((1 << value) & KING_MASK) == 0))
 			&& PossibleMoves::has_jumps_at(board.flip_turn(), (value + 14) & 31)
 		{
-			board.flip_turn()
+			board.flip_turn().set_previous_turn((value + 14) & 31)
 		} else {
 			board
 		}
@@ -576,7 +595,7 @@ impl CheckersBitBoard {
 		if (is_king || (((1 << value) & KING_MASK) == 0))
 			&& PossibleMoves::has_jumps_at(board.flip_turn(), (value + 2) & 31)
 		{
-			board.flip_turn()
+			board.flip_turn().set_previous_turn((value + 2) & 31)
 		} else {
 			board
 		}
@@ -609,7 +628,9 @@ impl CheckersBitBoard {
 		if (is_king || (((1 << value) & KING_MASK) == 0))
 			&& PossibleMoves::has_jumps_at(board.flip_turn(), value.wrapping_sub(2) & 31)
 		{
-			board.flip_turn()
+			board
+				.flip_turn()
+				.set_previous_turn((value.wrapping_sub(2)) & 31)
 		} else {
 			board
 		}
@@ -642,7 +663,9 @@ impl CheckersBitBoard {
 		if (is_king || (((1 << value) & KING_MASK) == 0))
 			&& PossibleMoves::has_jumps_at(board.flip_turn(), value.wrapping_sub(14) & 31)
 		{
-			board.flip_turn()
+			board
+				.flip_turn()
+				.set_previous_turn((value.wrapping_sub(14)) & 31)
 		} else {
 			board
 		}
-- 
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