adding bot

1 files changed, 105 insertions, 0 deletions

diff --git a/src/bot.cpp b/src/bot.cpp
new file mode 100644
index 0000000..8889156
--- /dev/null
+++ b/src/bot.cpp
@@ -0,0 +1,105 @@
+#include "bot.hpp"
+#include "board.hpp"
+#include "moves.hpp"
+#include <cmath>
+#include <ctime>
+
+int PAWN_VALUE = 100;
+int KNIGHT_VALUE = 200;
+int BISHOP_VALUE = 300;
+int ROOK_VALUE = 400;
+int QUEEN_VALUE = 900;
+
+Move EngineGetBestMove(Board *b) {
+  auto moves = GetLegalMoves(b);
+  std::srand(std::time(0)); // use current time as seed for random generator
+  int random_pos = std::rand() % moves.size();
+  Move move = moves[random_pos];
+  return move;
+}
+
+float EvaluateBoard(Board *b) {
+  float score = 0;
+  Board BoardCopy = *b;
+
+  bool isStaleMate = false;
+
+  auto legalMoves = GetLegalMoves(&BoardCopy);
+  if (b->state == WHITE_WON) {
+    score = INFINITY;
+  }
+  if (b->state == BLACK_WON) {
+    score = INFINITY * -1;
+  }
+  if (b->state == STALEMATE || b->state == DRAW) {
+    isStaleMate = true;
+  }
+  int white_pawn_count = 0;
+  int white_knight_count = 0;
+  int white_bishop_count = 0;
+  int white_rook_count = 0;
+  int white_queen_count = 0;
+
+  int black_pawn_count = 0;
+  int black_knight_count = 0;
+  int black_bishop_count = 0;
+  int black_rook_count = 0;
+  int black_queen_count = 0;
+  for (Piece piece : b->pieces) {
+    if (piece.type == NONE) {
+      continue;
+    }
+    if (piece.color) {
+      // white
+      if (piece.type == PAWN) {
+        white_pawn_count++;
+      }
+      if (piece.type == KNIGHT) {
+        white_knight_count++;
+      }
+      if (piece.type == BISHOP) {
+        white_bishop_count++;
+      }
+      if (piece.type == ROOK) {
+        white_rook_count++;
+      }
+      if (piece.type == QUEEN) {
+        white_queen_count++;
+      }
+      continue;
+    }
+
+    // black
+    if (piece.type == PAWN) {
+      black_pawn_count++;
+    }
+    if (piece.type == KNIGHT) {
+      black_knight_count++;
+    }
+    if (piece.type == BISHOP) {
+      black_bishop_count++;
+    }
+    if (piece.type == ROOK) {
+      black_rook_count++;
+    }
+    if (piece.type == QUEEN) {
+      black_queen_count++;
+    }
+  }
+
+  score += white_pawn_count * PAWN_VALUE;
+  score += white_knight_count * KNIGHT_VALUE;
+  score += white_bishop_count * BISHOP_VALUE;
+  score += white_rook_count * ROOK;
+  score += white_queen_count * QUEEN_VALUE;
+
+  score -= black_pawn_count * PAWN_VALUE;
+  score -= black_knight_count * KNIGHT_VALUE;
+  score -= black_bishop_count * BISHOP_VALUE;
+  score -= black_rook_count * ROOK;
+  score -= black_queen_count * QUEEN_VALUE;
+  if (isStaleMate) {
+    return 0;
+  }
+  return score;
+}