#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";
  }
}