From 63f380a48ab21f39962b60837fa487e9f978be95 Mon Sep 17 00:00:00 2001
From: Adam <adammegarules1@gmail.com>
Date: Fri, 31 Jul 2026 15:14:12 +0200
Subject: adding perft

---
 src/misc.cpp | 16 ++++++++++++++++
 src/misc.hpp |  4 ++++
 src/uci.cpp  | 18 +++++++++++++++++-
 3 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/src/misc.cpp b/src/misc.cpp
index 8527fdc..db9240c 100644
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -1,4 +1,6 @@
 #include "misc.hpp"
+#include "moves.hpp"
+#include <cstdint>
 #include <string>
 
 std::string version = "0";
@@ -6,3 +8,17 @@ std::string version = "0";
 std::string engine_version() { return "Mono " + version; };
 
 std::string engine_info() { return engine_version() + " by Adam " + "\n"; }
+
+uint64_t MoveGenTest(int depth, Game *g) {
+  uint64_t num = 0;
+  if (depth <= 0) {
+    return 1;
+  }
+  auto moves = GetLegalMoves(g);
+  for (auto move : moves) {
+    UndoMove undo = MakeMove(move, g);
+    num += MoveGenTest(depth - 1, g);
+    UnMakeMove(undo, g);
+  }
+  return num;
+}
diff --git a/src/misc.hpp b/src/misc.hpp
index 6bf8e02..c84edef 100644
--- a/src/misc.hpp
+++ b/src/misc.hpp
@@ -1,9 +1,13 @@
 #ifndef SRC_MICS_H_
 #define SRC_MICS_H_
 
+#include "board/board.hpp"
+#include <cstdint>
 #include <string>
 
 std::string engine_info();
 std::string engine_version();
 
+uint64_t MoveGenTest(int depth, Game *g);
+
 #endif /* SRC_MICS_H_ */
diff --git a/src/uci.cpp b/src/uci.cpp
index 89d28dd..8c24ed4 100644
--- a/src/uci.cpp
+++ b/src/uci.cpp
@@ -11,6 +11,7 @@
 #include <cctype>
 #include <cstdint>
 #include <cstdio>
+#include <cstdlib>
 #include <iostream>
 #include <sstream>
 #include <string>
@@ -49,6 +50,7 @@ Move UciToMove(string uci) {
 
   return {from, to};
 }
+
 Game initBoard(
     string startingFEN,
     std::unordered_map<uint64_t, TranspositionsEntry> *transPositions) {
@@ -115,7 +117,6 @@ void Uci() {
       cout << "readyok\n";
       cout.flush();
     } else if (cmd.starts_with("go")) {
-
       stringstream ss(line);
 
       string token;
@@ -195,6 +196,21 @@ void Uci() {
 
         MakeMove(move, &game);
       }
+    } else if (cmd.starts_with("perft")) {
+      std::istringstream iss(cmd);
+
+      std::string word;
+      int depth = -1;
+
+      if (!(iss >> word >> depth) || word != "perft" || depth < 0) {
+        cout << "info string usage: perft <non-negative depth>\n";
+        cout.flush();
+        continue;
+      }
+      int count = MoveGenTest(depth, &game);
+
+      cout << count << "\n";
+      cout.flush();
     }
   }
 }
-- 
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