From b05fb5c303fb3c5f8a0141bca50cda1cb73ce2d6 Mon Sep 17 00:00:00 2001
From: cdricms <36056008+cdricms@users.noreply.github.com>
Date: Thu, 21 Dec 2023 12:04:19 +0100
Subject: [PATCH] Started working on generating the moves

---
 src/board.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 src/board.h |  3 ++-
 2 files changed, 66 insertions(+), 4 deletions(-)

diff --git a/src/board.c b/src/board.c
index 864435f..20370b1 100644
--- a/src/board.c
+++ b/src/board.c
@@ -5,14 +5,75 @@ Piece piece_getColorlessPiece(const Piece piece) {
   return piece_getColor(piece) ^ piece;
 }
 
-uint board_getIndex(const Coordinates coords) {
+int board_getIndex(const Coordinates coords) {
+  if (coords.row < 1 || coords.row > 8) {
+    printf("[ERROR]: Row out of bounds.\n");
+    return -1;
+  }
+  if (coords.column < 1 || coords.column > 8) {
+    printf("[ERROR]: Column out of bounds.\n");
+    return -1;
+  }
   return (8 - (coords.row + 7) % 8) * 8 - (8 - (coords.column + 7) % 8);
 }
 
+void piece_getMoves(const Board board, const Piece piece,
+                    const Coordinates piece_coords) {
+  Pieces colorless_piece = piece_getColorlessPiece(piece);
+  PieceColors piece_color = piece_getColor(piece);
+  int board_index = board_getIndex(piece_coords);
+  if (board_index == -1)
+    return;
+  Coordinates moves[27];
+  uint moves_i = 0;
+  switch (colorless_piece) {
+  case Pawn: {
+    Coordinates new_coordinates = {.column = piece_coords.column,
+                                   .row = piece_color == Black
+                                              ? piece_coords.row - 1
+                                              : piece_coords.row + 1};
+    moves[moves_i++] = new_coordinates;
+
+    bool is_starting_pos =
+        piece_color == Black ? piece_coords.row == 7 : piece_coords.row == 2;
+    if (is_starting_pos) {
+      Coordinates leap_coords = {.column = piece_coords.column,
+                                 .row = piece_color == Black
+                                            ? piece_coords.row - 2
+                                            : piece_coords.row + 2};
+      moves[moves_i++] = leap_coords;
+    }
+  } break;
+  case Knight: {
+    struct temp {
+      int x;
+      int y;
+    };
+    struct temp temps[8] = {{-1, 2}, {1, 2},   {2, 1},   {2, -1},
+                            {1, -2}, {-1, -2}, {-2, -1}, {-2, 1}};
+    for (int i = 0; i < 8; i++) {
+      Coordinates new_coordinates = {.row = piece_coords.row + temps[i].y,
+                                     .column =
+                                         piece_coords.column + temps[i].x};
+      int index = board_getIndex(new_coordinates);
+      if (index != -1)
+        moves[moves_i++] = new_coordinates;
+    }
+  } break;
+  case Bishop: {
+    uint max = 13;
+
+  } break;
+  }
+}
+
 bool board_movePiece(Board board, const Coordinates from,
                      const Coordinates to) {
-  uint from_index = board_getIndex(from);
-  uint to_index = board_getIndex(to);
+  int from_index = board_getIndex(from);
+  int to_index = board_getIndex(to);
+  if (from_index == -1 || to_index == -1)
+    return false;
+
   board[to_index].piece = board[from_index].piece;
   board[from_index].piece = -1;
   return true;
diff --git a/src/board.h b/src/board.h
index ef4c607..55c91b3 100644
--- a/src/board.h
+++ b/src/board.h
@@ -1,7 +1,7 @@
 #ifndef __BOARD_HEADER
 #include "common.h"
 
-typedef int Piece;
+typedef uint Piece;
 typedef enum { Pawn = 0, Knight, Bishop, Rook, Queen, King } Pieces;
 typedef enum { White = 0, Black = 8 } PieceColors;
 
@@ -21,5 +21,6 @@ PieceColors piece_getColor(const Piece piece);
 Piece piece_getColorlessPiece(const Piece piece);
 
 bool board_movePiece(Board board, const Coordinates from, const Coordinates to);
+int board_getIndex(const Coordinates coords);
 
 #endif // !__BOARD_HEADER