moving enum around

2 files changed, 45 insertions, 9 deletions

diff --git a/src/board/board.hpp b/src/board/board.hpp
index 6f72e56..35e2196 100644
--- a/src/board/board.hpp
+++ b/src/board/board.hpp
@@ -32,6 +32,42 @@ struct Position {
 
   bool operator==(const Position &) const = default;
 };
+
+/*
+ * Maybe we can try to be efficent with memory by using a byte (char) or
+ * something like that let me brainstorm a little
+ *
+ * first two bits can be promotion flag because there are 4 posible options:
+ * NONE BISHOP ROOK QUEEN
+ * but wait none it not requided because its only applied
+ * when on last rank
+ * but that doesnt help becuase we cant have three options
+ * ok so first 2 bits for promotion flag
+ * like this ZZYYYYYY with ZZ being the promotion flag
+ * 00 for none piece
+ * 01 for queen
+ * 10 for rook
+ * 11 for bishop
+ * these valuesa are abritrari
+ * so we have other 6 bytes which doesnt work that well because we need to store
+ * two 64 bit numbers one for "From" and second for "To"
+ * so wait how much is a 64 for bit
+ * 2 * 2 = 4 (2 bits)
+ * 4 * 2 = 8 (3 bits)
+ * 8 * 2 = 16 (4 bits)
+ * 16 * 2 = 32 (5 bits)
+ * 32 * 2 = 64 (6 bits)
+ * so six bits that means that we can only store one posiiton we need a 2 + 6 *
+ * 2 (14) bits of value to represent it but wait when promotion flag isnt 0 we
+ * know its last rank oh but we dont know if from white or black perpective so
+ * 14 bits is required let me search if there is a way to store that data
+ * alright search done result seams that best way is to use 16 bit interger
+ * which look like good solution and we have 2 bits left if we want to add more
+ * things here is a diagram for it uint16_t: XXFFFFFFTTTTTT XX for promotion
+ * flag F for from position T for to position so we can try first writing a
+ * helper function for working with it then replace existing move struct
+ */
+
 struct Move {
   Position From;
   Position To;
diff --git a/src/board/fen.cpp b/src/board/fen.cpp
index dd503e0..e020e78 100644
--- a/src/board/fen.cpp
+++ b/src/board/fen.cpp
@@ -48,7 +48,14 @@ static void clearBoard(Game *g) {
   g->whiteCastleKing = false;
   g->whiteCastleQueen = false;
 }
-
+enum parserState : std::uint8_t {
+  BOARD,
+  PLAYER_TO_MOVE,
+  CASTLE,
+  ENPASSANT,
+  HALF_MOVE_CLOCK,
+  FULL_MOVE_CLOCK,
+};
 void setBoardFen(const std::string &fen, Game *g) {
   clearBoard(g);
   // example fen rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
@@ -56,14 +63,7 @@ void setBoardFen(const std::string &fen, Game *g) {
   int rank = 7;
 
   Position enpassant = {};
-  enum parserState : std::uint8_t {
-    BOARD,
-    PLAYER_TO_MOVE,
-    CASTLE,
-    ENPASSANT,
-    HALF_MOVE_CLOCK,
-    FULL_MOVE_CLOCK,
-  };
+
   parserState parser_state = BOARD;
 
   for (uint i = 0; i < fen.length(); i++) {