1 files changed, 109 insertions, 0 deletions
diff --git a/src/repl.cpp b/src/repl.cpp
new file mode 100644
index 0000000..642419a
--- /dev/null
+++ b/src/repl.cpp
@@ -0,0 +1,109 @@
+#include "repl.hpp"
+#include "board.hpp"
+#include "moves.hpp"
+#include <algorithm>
+#include <cctype>
+#include <cstdint>
+#include <cstdlib>
+#include <iostream>
+#include <print>
+#include <string>
+
+bool isValidChessRank(char rank) {
+  if (rank >= '1' && rank <= '8') {
+    return true;
+  } else {
+    return false;
+  }
+}
+bool isValidChessFile(char rank) {
+  if (rank >= 'A' && rank <= 'H') {
+    return true;
+  } else {
+    return false;
+  }
+}
+int startREPL(Board *b) {
+  printBoard(b);
+  while (true) {
+    std::cout << "> ";
+    std::string command;
+    std::cin >> command;
+
+    std::transform(command.begin(), command.end(), command.begin(), ::toupper);
+    if (command == "EXIT") {
+      std::println();
+      std::cout << "Exiting...\n";
+      return EXIT_SUCCESS;
+    }
+    if (command == "BOARD") {
+      printBoard(b);
+      continue;
+    }
+
+    if (command.length() != 4) {
+      std::cout << "Unknown Command, use EXIT to exit";
+      std::println();
+      continue;
+    }
+    if (!isValidChessFile(command[0])) {
+      std::cout << "ERROR: Expected valid file at first place";
+      std::println();
+      continue;
+    }
+
+    if (!isValidChessRank(command[1])) {
+      std::cout << "ERROR: Expected valid rank at second place";
+      std::println();
+      continue;
+    }
+
+    if (!isValidChessFile(command[2])) {
+      std::cout << "ERROR: Expected valid file at third place";
+      std::println();
+      continue;
+    }
+
+    if (!isValidChessRank(command[3])) {
+      std::cout << "ERROR: Expected valid rank at four place";
+      std::println();
+      continue;
+    }
+
+    // we know its a valid chess pos
+    int fromFile = command[0] - 'A';
+    int fromRank = '8' - command[1];
+    int toFile = command[2] - 'A';
+    int toRank = '8' - command[3];
+    std::cout << fromFile << "\n";
+    std::cout << fromRank << "\n";
+    std::cout << toFile << "\n";
+    std::cout << toRank << "\n";
+    Move move = {
+        {static_cast<uint8_t>(fromRank), static_cast<uint8_t>(fromFile)},
+        {static_cast<uint8_t>(toRank), static_cast<uint8_t>(toFile)}};
+
+    auto moves = GetLegalMoves(b);
+    if (!(std::ranges::find(moves, move) != moves.end())) {
+      std::cout << "Invalid move!";
+      std::println();
+      PrintMoves(moves);
+      continue;
+    }
+    std::println();
+    PlayMove(move, b);
+    b->MoveClock++;
+    b->turn = !b->turn;
+    printBoard(b);
+  }
+}
+
+void PrintMoves(const std::vector<Move> &moves) {
+  std::cout << "Moves (" << moves.size() << "):\n";
+
+  for (const Move &move : moves) {
+    std::cout << "(" << (int)move.From.file << ", " << (int)move.From.rank
+              << ") -> (" << (int)move.To.file << ", " << (int)move.To.rank
+              << ")\n";
+  }
+}