From ebed5c05ed5d19c828fdc3265777bcc2831558bd Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Tue, 19 Dec 2023 11:13:06 -0800
Subject: [PATCH] [bitboard] Add a BitBoard and a Position struct

---
 bitboard/src/bitboard.rs |  4 ++++
 bitboard/src/lib.rs      |  4 ----
 bitboard/src/position.rs | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 37 insertions(+), 4 deletions(-)
 create mode 100644 bitboard/src/bitboard.rs
 create mode 100644 bitboard/src/position.rs

diff --git a/bitboard/src/bitboard.rs b/bitboard/src/bitboard.rs
new file mode 100644
index 0000000..72687bf
--- /dev/null
+++ b/bitboard/src/bitboard.rs
@@ -0,0 +1,4 @@
+// Eryn Wells <eryn@erynwells.me>
+
+#[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
+pub struct BitBoard(u64);
diff --git a/bitboard/src/lib.rs b/bitboard/src/lib.rs
index 7d12d9a..05aaacb 100644
--- a/bitboard/src/lib.rs
+++ b/bitboard/src/lib.rs
@@ -1,7 +1,3 @@
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/bitboard/src/position.rs b/bitboard/src/position.rs
new file mode 100644
index 0000000..4bedbf7
--- /dev/null
+++ b/bitboard/src/position.rs
@@ -0,0 +1,33 @@
+// Eryn Wells <eryn@erynwells.me>
+
+mod color {
+    const WHITE = 0;
+    const BLACK = 1;
+}
+
+mod piece {
+    const PAWN = 0;
+    const KNIGHT = 1;
+    const BISHOP = 2;
+    const ROOK = 3;
+    const QUEEN = 4;
+    const KING = 5;
+}
+
+#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+pub struct Position {
+    /// Composite bitboards for all the pieces of a particular color.
+    pieces_per_color: [BitBoard; 2],
+
+    /// Bitboards representing positions of particular piece types per color.
+    pieces_per_type: [[BitBoard; 6]; 2],
+}
+
+impl Position {
+    static fn empty() -> Position {
+        Position {
+            pieces_per_color = [],
+            pieces_per_type = [],
+        }
+    }
+}