saving cache to dish

4 files changed, 42 insertions, 10 deletions

diff --git a/.gitignore b/.gitignore
index 1adb011..81658aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ tmp
 .cache/
 uci_log.txt
 moves.txt
+cache/
diff --git a/src/bot.cpp b/src/bot.cpp
index 84949bb..f114f36 100644
--- a/src/bot.cpp
+++ b/src/bot.cpp
@@ -145,10 +145,8 @@ float minimax(int depth, Game *b, float alpha, float beta) {
     return EvaluateBoardForWhite(b, depth);
   }
 
-  float bestEval;
+  float bestEval = b->turn ? -INFINITY : INFINITY;
   if (b->turn) {
-    bestEval = -INFINITY;
-
     for (Move move : moves) {
       UndoMove undo = MakeMove(move, b);
 
@@ -164,10 +162,7 @@ float minimax(int depth, Game *b, float alpha, float beta) {
       }
     }
   } else {
-    bestEval = INFINITY;
-
     for (Move move : moves) {
-
       UndoMove undo = MakeMove(move, b);
 
       float eval = minimax(depth - 1, b, alpha, beta);
diff --git a/src/uci.cpp b/src/uci.cpp
index b45df57..310d31c 100644
--- a/src/uci.cpp
+++ b/src/uci.cpp
@@ -7,6 +7,7 @@
 #include <algorithm>
 #include <cassert>
 #include <cctype>
+#include <cstdint>
 #include <iostream>
 #include <print>
 #include <sstream>
@@ -17,11 +18,40 @@
 #include <iomanip>
 #include <unordered_map>
 
-std::ofstream uciLog("uci_log.txt", std::ios::app);
+std::ofstream uciLog("cache/uci_log.txt", std::ios::app);
+
+bool LoadTable(
+    const std::string &filename,
+    std::unordered_map<uint64_t, TranspositionsEntry> *transpositions) {
+  std::ifstream file(filename);
+
+  if (!file.is_open())
+    return false;
+
+  uint64_t hash;
+  int depth;
+  float eval;
+
+  while (file >> hash >> depth >> eval) {
+    transpositions->operator[](hash) = {depth, eval};
+  }
+
+  return true;
+}
+void SaveTranspositionTable(
+    const std::unordered_map<uint64_t, TranspositionsEntry> &table) {
+
+  std::ofstream file("cache/positions.txt", std::ios::trunc);
+
+  for (const auto &[key, value] : table) {
+    file << key << ' ' << value.depth << ' ' << value.Eval << '\n';
+  }
+};
 
 void LogUci(const std::string &message) {
-  if (!uciLog.is_open())
+  if (!uciLog.is_open()) {
     return;
+  }
 
   auto now = std::chrono::system_clock::now();
   auto time = std::chrono::system_clock::to_time_t(now);
@@ -76,7 +106,7 @@ void Uci() {
   Game game =
       initBoard("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
                 &transpositions);
-
+  LoadTable("cache/positions.txt", &transpositions);
   string line;
 
   while (getline(cin, line)) {
@@ -122,7 +152,7 @@ void Uci() {
         }
       }
       println();
-
+      SaveTranspositionTable(transpositions);
       cout.flush();
     } else if (cmd.starts_with("position")) {
       stringstream ss(line);
diff --git a/src/uci.hpp b/src/uci.hpp
index 9352c48..7b6dca4 100644
--- a/src/uci.hpp
+++ b/src/uci.hpp
@@ -3,6 +3,7 @@
 
 #include "board.hpp"
 #include <string>
+#include <unordered_map>
 
 Move UciToMove(std::string uci);
 void LogUci(const std::string &message);
@@ -10,4 +11,9 @@ void Uci();
 Game initBoard(
     std::string startingFEN,
     std::unordered_map<uint64_t, TranspositionsEntry> *transPositions);
+void SaveTranspositionTable(
+    const std::unordered_map<uint64_t, TranspositionsEntry> &table);
+bool LoadTable(
+    const std::string &filename,
+    std::unordered_map<uint64_t, TranspositionsEntry> *transpositions);
 #endif /* SRC_UCI_H_ */