using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour
{
    public float gameTime = 20;
    public float totalTimeElapsed = 0;
    public int playerScore = 0;


    [Header("GAME UI")]
    public Text timeRemaining;
    public Text gameOverText;
    public Button PlayAgain;
    public Text PlayAgainText;
    public Text distanceTravelled;
    public Button QuitGame;
    public Text QuitText;
    public Text pointsScored;

    private void Start()
    {
        gameOverText.enabled = false;
        PlayAgain.enabled = false;
        PlayAgain.image.enabled = false;
        PlayAgainText.enabled = false;
        QuitGame.enabled = false;
        QuitGame.image.enabled = false;
        QuitText.enabled = false;
        timeRemaining.text = gameTime.ToString();
        Time.timeScale = 1;
        totalTimeElapsed = 0;

    }

    void FixedUpdate() {
        if (gameTime <= 0) {
            gameOver();
            distanceTravelled.text = string.Format("{0:#0.00} meters", totalTimeElapsed);
        } else {
            totalTimeElapsed += Time.deltaTime;
            gameTime -= Time.deltaTime;
            timeRemaining.text = Mathf.Floor(gameTime).ToString();
            distanceTravelled.text = string.Format("{0:#0.00} meters", totalTimeElapsed);
        }
    }

public void AddScore(int points)
    {
        playerScore += points;
        //This convert the score (a number) into a string
        pointsScored.text = playerScore.ToString();
    }

    public void AdjustTime(float amount) {
        gameTime += amount;
        if (amount < 0) { SlowWorldDown(); }
    }

    public void SlowWorldDown() {
        // Cancel any invokes to speed the world up
        // Then slow the world down for less than 1 second

        CancelInvoke();
        Time.timeScale = 0.5f;
        Invoke("SpeedWorldUp", 1);
    }

    void SpeedWorldUp() { Time.timeScale = 1f; }

    public void ExitGame()
    {
        Application.Quit();
        Debug.Log("Game is exiting");
    }

    public void RestartGame() { SceneManager.LoadScene("GameLoad"); }
    //public void RestartGame() { SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex); }

    public void resetScore() { playerScore = 0; }

    public void gameOver() {
        Time.timeScale = 0;
        gameOverText.enabled = true;
        distanceTravelled.text = string.Format("{0:#0.00} meters", totalTimeElapsed);
        timeRemaining.text = "0";
        distanceTravelled.text = "0";
        PlayAgain.enabled = true;
        PlayAgain.image.enabled = true;
        PlayAgainText.enabled = true;
        QuitGame.enabled = true;
        QuitGame.image.enabled = true;
        QuitText.enabled = true;
    }

}