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#include <iostream>
#include <limits>
#include <random>

const char PLAYER_ONE = 'X';
const char PLAYER_TWO = 'O';
const char EMPTY = '-';

void drawBoard(const int fieldSize, char** board) {
    for (int i = 0; i < fieldSize; ++i) {
        for (int j = 0; j < fieldSize; ++j) {
            std::cout << board[i][j] << ' ';
        }
        std::cout << std::endl;
    }
}

bool checkWin(const int fieldSize, char** board, char player) {
    for (int i = 0; i < fieldSize; ++i) {
        bool rowWin = true;
        bool colWin = true;
        for (int j = 0; j < fieldSize; ++j) {
            rowWin &= (board[i][j] == player);
            colWin &= (board[j][i] == player);
        }
        if (rowWin || colWin) {
            return true;
        }
    }

    bool diagonalWin = true;
    bool reverseDiagonalWin = true;
    for (int i = 0; i < fieldSize; ++i) {
        diagonalWin &= (board[i][i] == player);
        reverseDiagonalWin &= (board[i][fieldSize - i - 1] == player);
    }

    return diagonalWin || reverseDiagonalWin;
}

void computerMove(const int fieldSize, char** board, char player) {
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<> distrib(0, fieldSize - 1);

    int row = distrib(gen);
    int col = distrib(gen);

    while (board[row][col] != EMPTY) {
        row = distrib(gen);
        col = distrib(gen);
    }

    std::cout << "Computer move: row " << row + 1 << ", col " << col + 1 << std::endl;
    board[row][col] = player;
}

int main() {
    int fieldSize;
    std::cout << "Enter the field size: ";
    if (!(std::cin >> fieldSize)) {
        std::cout << "Error. Field size can only be set as a number" << std::endl;
        return 1;
    }

    char** board = new char*[fieldSize];
    for (int i = 0; i < fieldSize; ++i) {
        board[i] = new char[fieldSize];
        for (int j = 0; j < fieldSize; ++j) {
            board[i][j] = EMPTY;
        }
    }

    bool playerOneTurn = true;
    int moves = fieldSize * fieldSize;
    while (moves > 0) {
        drawBoard(fieldSize, board);

        if (playerOneTurn) {
            int row, col;
            std::cout << "Player 1, enter your move (row, col): ";
            std::cin >> row >> col;

            row -= 1; // subtract 1 from row
            col -= 1; // subtract 1 from column
            
            while (std::cin.fail() || row < 0 || row >= fieldSize || col < 0 || col >= fieldSize || board[row][col] != EMPTY) {
                std::cin.clear();
                std::cin.ignore(std::numeric_limits<std::
                streamsize>::max(), '\n');
                std::cout << "Invalid input. Please enter a valid move (row, col): ";
                std::cin >> row >> col;
                row -= 1; // subtract 1 from row
                col -= 1; // subtract 1 from column
}

    // Fix the bug here:
    board[row][col] = PLAYER_ONE;
    if (checkWin(fieldSize, board, PLAYER_ONE)) {
        drawBoard(fieldSize, board);
        std::cout << "You win!" << std::endl;
        break;
    }

   // Add computer move here:
    int computerRow, computerCol;
    do {
        computerRow = rand() % fieldSize;
        computerCol = rand() % fieldSize;
    } while (board[computerRow][computerCol] != EMPTY);

    board[computerRow][computerCol] = PLAYER_TWO;
    if (checkWin(fieldSize, board, PLAYER_TWO)) {
        drawBoard(fieldSize, board);
        std::cout << "Computer wins!" << std::endl;
        break;
    }

    --moves;
}

    if (moves == 0) {
    drawBoard(fieldSize, board);
    std::cout << "It's a draw!" << std::endl;
    }
}

    for (int i = 0; i < fieldSize; ++i) {
    delete[] board[i];
}
    delete[] board;

    return 0;
}