From fa99aa2d53eb1f784b6e7bb4971cf36092488957 Mon Sep 17 00:00:00 2001
From: Adam <adammegarules1@gmail.com>
Date: Mon, 10 Aug 2026 15:04:37 +0200
Subject: making fen parser be self contained

---
 src/board/fen.cpp | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

(limited to 'src/board/fen.cpp')

diff --git a/src/board/fen.cpp b/src/board/fen.cpp
index c4c5e7a..5f27e68 100644
--- a/src/board/fen.cpp
+++ b/src/board/fen.cpp
@@ -3,6 +3,7 @@
 #include <cassert>
 #include <cctype>
 #include <cstdlib>
+#include <cstring>
 #include <print>
 #include <string>
 #include <sys/types.h>
@@ -10,7 +11,39 @@
 bool WHITE = true;
 bool BLACK = false;
 
+static void updateBitboards(Game *g) {
+  g->PieceBitboard = 0;
+  g->WhitePieceBitboard = 0;
+  g->BlackPieceBitboard = 0;
+  std::memset(g->PieceBitboards, 0, sizeof(g->PieceBitboards));
+  for (uint8_t i = 0; i < 64; i++) {
+    Piece piece = g->pieces[i];
+    if (piece.type == NONEPIECE) {
+      continue;
+    }
+    g->PieceBitboards[piece.color][piece.type] |= (1ULL << i);
+
+    if (piece.color) {
+      g->WhitePieceBitboard |= (1ULL << i);
+    } else {
+      g->BlackPieceBitboard |= (1ULL << i);
+    }
+  }
+  g->PieceBitboard = g->WhitePieceBitboard | g->BlackPieceBitboard;
+}
+static void SetPiece(int i, PieceType type, bool color, Game *g) {
+  g->pieces[i] = {.color = color, .type = type};
+}
+
 void setBoardFen(const std::string fen, Game *g) {
+  for (int i = 0; i < 64; ++i) {
+    g->pieces[i] = {.color = false, .type = NONEPIECE};
+  }
+  g->blackCastleKing = false;
+  g->blackCastleQueen = false;
+  g->whiteCastleKing = false;
+  g->whiteCastleQueen = false;
+
   // example fen rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
   int file = 0;
   int rank = 7;
@@ -145,5 +178,5 @@ void setBoardFen(const std::string fen, Game *g) {
     break;
   }
   g->enPassant = enpassant;
-  UpdateHelpers(g);
+  updateBitboards(g);
 }
-- 
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