//

The only script in the game

//

using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

public class gameFunctionality : MonoBehaviour
{
    public GameObject playAgainButton;
    public GameObject VictoryText;
    public TMP_Text commandLineText;
    private string[] board;
    private int[] winningCombinations;
    public string PlayerTeam { get; private set; }
    public Button[] buttons;
    public float aiMoveDelay = 1f; // Delay for AI move
    private void Start()
    {
        winningCombinations = new int[]
        {
            0, 1, 2, // Row 1
            3, 4, 5, // Row 2
            6, 7, 8, // Row 3
            0, 3, 6, // Column 1
            1, 4, 7, // Column 2
            2, 5, 8, // Column 3 
            0, 4, 8, // Diagonal \
            2, 4, 6  // Diagonal /
        };
    }

    // Resets the game board to being empty
    public void ResetBoard()
    {
        commandLineText.text = commandLineText.text + "\n" + ">" + "Board Reset";
        // Initialize the game board with 9 empty spaces
        board = new string[9];
        for (int i = 0; i < board.Length; i++)
        {
            board[i] = " "; // " " represents an empty space
        }
    }

    // Logs the current state of the game board to the console
    public void LogBoard()
    {
        Debug.Log(
            board[0] + " " + board[1] + " " + board[2] + " " + "\n" +
            board[3] + " " + board[4] + " " + board[5] + " " + "\n" +
            board[6] + " " + board[7] + " " + board[8]
        );
    }


    // Checks if there is a winner and returns the winning player value
    public bool CheckWinCondition()
    {
        int occupiedSpaces = 0;

        for (int i = 0; i < winningCombinations.Length; i += 3)
        {
            if (board[winningCombinations[i]] != " " &&
                board[winningCombinations[i]] == board[winningCombinations[i + 1]] &&
                board[winningCombinations[i]] == board[winningCombinations[i + 2]])
            {
                EndGame(board[winningCombinations[i]]);
                return true;
            }
        }
        for (int i = 0; i < board.Length; i++)
        {
            if (board[i] != " ")
            {
                occupiedSpaces++;
            }

            if (occupiedSpaces == 9)
            {
                EndGame("Draw"); // All spaces occupied, no winner
                return true;
            }
        }
        commandLineText.text = commandLineText.text + "\n" + ">" + "Occupied Spaces: " + occupiedSpaces;
        Debug.Log("Occupied Spaces: " + occupiedSpaces);
        return false;
    }

    public void SetPlayerTeam(string team)
    {
        if (team != "X" && team != "O")
        {
            Debug.LogError("Invalid team. Choose 'X' or 'O'.");
            commandLineText.text = commandLineText.text + "\n" + ">" + "Player team: " + team;
            return;
        }

        PlayerTeam = team;

        BeginGame();
    }

    public void SetBoardActive(bool active)
    {
        for (int i = 0; i < buttons.Length; i++)
        {
            buttons[i].interactable = active;
        }
    }

    public void PlayerMove(int position)
    {
        if (board[position] == " ")
        {
            board[position] = PlayerTeam;
            commandLineText.text = commandLineText.text + "\n" + ">" + "Player: " + PlayerTeam + " played position: " + (position + 1);
            UpdateBoard();
            if (CheckWinCondition() == true) { return; }
            SetBoardActive(false);
            LogBoard();
            Invoke("AIMove", aiMoveDelay); // Wait for AI to make a move 
            return;
        }
    }

    public void AIMove()
    {
        string AITeam = PlayerTeam == "X" ? "O" : "X"; // AI plays the opposite team

        // Chooses a random available position for the AI to make a move
        List<int> availablePositions = new List<int>();
        // Simple AI logic to make a move
        for (int i = 0; i < board.Length; i++)
        {
            if (board[i] == " ")
            {
                availablePositions.Add(i);
            }
        }
        int Pos = availablePositions[Random.Range(0, availablePositions.Count)];

        {
                    // Moves to block the player from winning
        if (PlayerTeam == board[0] && PlayerTeam == board[1] && " " == board[2]) { Pos = 2; }
        else if (PlayerTeam == board[2] && PlayerTeam == board[1] && " " == board[2]) { Pos = 0; } // Top Row
        else if (PlayerTeam == board[0] && PlayerTeam == board[2] && " " == board[2]) { Pos = 1; }

        else if (PlayerTeam == board[3] && PlayerTeam == board[4] && " " == board[5]) { Pos = 5; }
        else if (PlayerTeam == board[5] && PlayerTeam == board[4] && " " == board[3]) { Pos = 3; } // Middle Row
        else if (PlayerTeam == board[3] && PlayerTeam == board[5] && " " == board[4]) { Pos = 4; }

        else if (PlayerTeam == board[6] && PlayerTeam == board[7] && " " == board[8]) { Pos = 8; }
        else if (PlayerTeam == board[8] && PlayerTeam == board[7] && " " == board[6]) { Pos = 6; } // Bottom Row
        else if (PlayerTeam == board[6] && PlayerTeam == board[8] && " " == board[7]) { Pos = 7; }

        else if (PlayerTeam == board[0] && PlayerTeam == board[3] && " " == board[6]) { Pos = 6; }
        else if (PlayerTeam == board[6] && PlayerTeam == board[3] && " " == board[0]) { Pos = 0; } // Left Column
        else if (PlayerTeam == board[0] && PlayerTeam == board[6] && " " == board[3]) { Pos = 3; }

        else if (PlayerTeam == board[1] && PlayerTeam == board[4] && " " == board[7]) { Pos = 7; }
        else if (PlayerTeam == board[7] && PlayerTeam == board[4] && " " == board[1]) { Pos = 1; } // Middle Column
        else if (PlayerTeam == board[1] && PlayerTeam == board[7] && " " == board[4]) { Pos = 4; }

        else if (PlayerTeam == board[2] && PlayerTeam == board[5] && " " == board[8]) { Pos = 8; }
        else if (PlayerTeam == board[8] && PlayerTeam == board[5] && " " == board[2]) { Pos = 2; } // Right Column
        else if (PlayerTeam == board[0] && PlayerTeam == board[6] && " " == board[3]) { Pos = 3; }

        else if (PlayerTeam == board[0] && PlayerTeam == board[4] && " " == board[8]) { Pos = 8; }
        else if (PlayerTeam == board[8] && PlayerTeam == board[4] && " " == board[0]) { Pos = 0; } // Diagonal \
        else if (PlayerTeam == board[2] && PlayerTeam == board[4] && " " == board[6]) { Pos = 6; }

        else if (PlayerTeam == board[2] && PlayerTeam == board[4] && " " == board[6]) { Pos = 6; }
        else if (PlayerTeam == board[6] && PlayerTeam == board[4] && " " == board[2]) { Pos = 2; } // Diagonal /
        else if (PlayerTeam == board[2] && PlayerTeam == board[6] && " " == board[4]) { Pos = 4; }

        // Moves to win
        if (AITeam == board[0] && AITeam == board[1] && " " == board[2]) { Pos = 2; }
        else if (AITeam == board[2] && AITeam == board[1] && " " == board[0]) { Pos = 0; } // Top Row
        else if (AITeam == board[0] && AITeam == board[2] && " " == board[1]) { Pos = 1; }

        else if (AITeam == board[3] && AITeam == board[4] && " " == board[5]) { Pos = 5; }
        else if (AITeam == board[5] && AITeam == board[4] && " " == board[3]) { Pos = 3; } // Middle Row
        else if (AITeam == board[3] && AITeam == board[5] && " " == board[4]) { Pos = 4; }

        else if (AITeam == board[6] && AITeam == board[7] && " " == board[8]) { Pos = 8; }
        else if (AITeam == board[8] && AITeam == board[7] && " " == board[6]) { Pos = 6; } // Bottom Row
        else if (AITeam == board[6] && AITeam == board[8] && " " == board[7]) { Pos = 7; }

        else if (AITeam == board[0] && AITeam == board[3] && " " == board[6]) { Pos = 6; }
        else if (AITeam == board[6] && AITeam == board[3] && " " == board[0]) { Pos = 0; } // Left Column
        else if (AITeam == board[0] && AITeam == board[6] && " " == board[3]) { Pos = 3; }

        else if (AITeam == board[1] && AITeam == board[4] && " " == board[7]) { Pos = 7; }
        else if (AITeam == board[7] && AITeam == board[4] && " " == board[1]) { Pos = 1; } // Middle Column
        else if (AITeam == board[1] && AITeam == board[7] && " " == board[4]) { Pos = 4; }

        else if (AITeam == board[2] && AITeam == board[5] && " " == board[8]) { Pos = 8; }
        else if (AITeam == board[8] && AITeam == board[5] && " " == board[2]) { Pos = 2; } // Right Column
        else if (AITeam == board[0] && AITeam == board[6] && " " == board[3]) { Pos = 3; }

        else if (AITeam == board[0] && AITeam == board[4] && " " == board[8]) { Pos = 8; }
        else if (AITeam == board[8] && AITeam == board[4] && " " == board[0]) { Pos = 0; } // Diagonal \
        else if (AITeam == board[2] && AITeam == board[4] && " " == board[6]) { Pos = 6; }

        else if (AITeam == board[2] && AITeam == board[4] && " " == board[6]) { Pos = 6; }
        else if (AITeam == board[6] && AITeam == board[4] && " " == board[2]) { Pos = 2; } // Diagonal /
        else if (AITeam == board[2] && AITeam == board[6] && " " == board[4]) { Pos = 4; }
        }


        board[Pos] = AITeam;
        UpdateBoard();
        commandLineText.text = commandLineText.text + "\n" + ">" + "Player: " + AITeam + " played position: " + (Pos + 1);
        if (CheckWinCondition() == true) { return; }
        SetBoardActive(true);
        LogBoard();
    }

    public void BeginGame()
    {
        ResetBoard();
        UpdateBoard();
        LogBoard();
        commandLineText.text = ">" + "Game Begin";
        

        if (PlayerTeam == "X")
        {
            SetBoardActive(true);
        }
        else
        {
            SetBoardActive(false);
            Invoke("AIMove", aiMoveDelay); // AI makes the first move if Player is "O"
        }
    }

    public void UpdateBoard()
    {
        for (int i = 0; i < board.Length; i++)
        {
            buttons[i].GetComponentInChildren<TextMeshProUGUI>().text = board[i];
            if (board[i] == "X")
            {
                buttons[i].GetComponentInChildren<TextMeshProUGUI>().color = Color.red; // Change text color for X
            }
            else if (board[i] == "O")
            {
                buttons[i].GetComponentInChildren<TextMeshProUGUI>().color = Color.blue; // Change text color for O
            }
        }
    }

    public void EndGame(string winner)
    {
        SetBoardActive(false);
        commandLineText.text = winner == "Draw" ? commandLineText.text + "\n" + ">" + "It's a Draw!" : commandLineText.text + "\n" + ">" + winner + " Wins!";

        playAgainButton.SetActive(true);
        VictoryText.GetComponent<TextMeshProUGUI>().text = winner == "Draw" ? "It's a Draw!" : winner + " Wins!";
        VictoryText.SetActive(true);
    }
}