// Player Script :
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Player : MonoBehaviour
{
    [SerializeField]
     private float _speed = 4f;
     private float _speedMultiplier = 2;
    [SerializeField]
     private GameObject _laserPrefab;
     [SerializeField]
     private float _firerate = 0.5f;
    [SerializeField]
    private float _canfire = -1f;
    [SerializeField]
    private int _lives = 3;
    [SerializeField]
    private SpawnManager _spawnManager;
    [SerializeField]
    private bool _isTripleShotActive = false;
    [SerializeField]
    private bool _isSpeedBoostActive = false;
    [SerializeField]
    private GameObject _tripleShotPrefab;
    [SerializeField]
    private bool _isShieldActive = false;
    [SerializeField]
    private GameObject _shieldVisualizer;
    [SerializeField]
    private GameObject _leftEngine , _rightEngine ;
    [SerializeField]
    private int _score;
     [SerializeField]
     private int _bestScore;
    private UIManager _uiManager;
    [SerializeField]
    private AudioClip _laserSoundClip;

    private AudioSource _audioSource;
     void Start()
    {

        transform.position = new Vector3(0,0,0);
        _spawnManager = GameObject.Find("Spawn_Manager").GetComponent<SpawnManager>();
        _uiManager = GameObject.Find("Canvas").GetComponent<UIManager>();
       _audioSource = GetComponent<AudioSource>();
        if(_spawnManager==null) {
          Debug.LogError("The Spawn Manager is Null");
        }
        if(_uiManager == null)
        {
         Debug.Log("The UI Manager is null");
        }
        if(_audioSource == null)
        {
          Debug.LogError("Audio is not there");
        }
        else
        {
          _audioSource.clip = _laserSoundClip;
        }
    }

    void Update()
    {
        CalculateMovement();

        if(Input.GetKeyDown(KeyCode.Space)&& Time.time > _canfire) {
          FireLaser();
        }

    }


    void CalculateMovement () {
        float horizontalInput = Input.GetAxis("Horizontal");
         float verticalInput = Input.GetAxis("Vertical");

        Vector3 direction = new Vector3(horizontalInput,verticalInput,0);

      transform.Translate(direction*_speed*Time.deltaTime);

       transform.position = new Vector3(transform.position.x,Mathf.Clamp(transform.position.y,-3.8f,0),0);

      if(transform.position.x > 11.3f) {
        transform.position = new Vector3(-11.3f,transform.position.y,0);
      }
      else if(transform.position.x < -11.3f) {
        transform.position = new Vector3(11.3f,transform.position.y,0);
      }
    }

    void FireLaser() {
          _canfire = Time.time + _firerate;

         if(_isTripleShotActive == true) {
            Instantiate(_tripleShotPrefab, transform.position,Quaternion.identity);
         }
         else {
          Instantiate(_laserPrefab,transform.position + new Vector3(0,1.05f,0),Quaternion.identity);
         }
         _audioSource.Play();
           }

   public void Damage() {

    if(_isShieldActive == true) {
      _isShieldActive = false;
      _shieldVisualizer.SetActive(false);
      return;
    }

  _lives--;

   if(_lives == 2) {
    _leftEngine.SetActive(true);
   }
   else if(_lives == 1) {
    _rightEngine.SetActive(true);
   }

    _uiManager.UpdateLives(_lives);
      if(_lives <= 0) {
     _spawnManager.OnPlayerDeath();
     _uiManager.CheckForBestScore();
      Destroy(this.gameObject);

     }

    }

    public void TripleShotActive()
    {
      _isTripleShotActive = true;
      StartCoroutine(TripleShotPowerDownRoutine());
    }

   IEnumerator TripleShotPowerDownRoutine()
   {
    yield return new WaitForSeconds(5.0f);
    _isTripleShotActive = false;
   }

public void SpeedBoostActive() {
  _isSpeedBoostActive = true;
  _speed*= _speedMultiplier;
  StartCoroutine(SpeedBoostPowerDownRoutine());
}

IEnumerator SpeedBoostPowerDownRoutine () {
  yield return new WaitForSeconds(5.0f);
  _isSpeedBoostActive = false;
  _speed/= _speedMultiplier;
}

public void ShieldsActive() {
  _isShieldActive = true;
  _shieldVisualizer.SetActive(true);
}

public void AddScore(int points)
{
  _score += points;
  _uiManager.UpdatedScore(_score);
}

public void bestScore(int _score)
{
   if(_score >_bestScore )
     {
       _bestScore = _score;
       _uiManager.CheckForBestScore(_bestScore);

     }
}
}


// UIManager Script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using TMPro;
using UnityEngine.SceneManagement;

public class UIManager : MonoBehaviour
{
    [SerializeField]
    private TextMeshProUGUI _scoreText, bestText;
    [SerializeField]
    private Image _LivesImg;
    [SerializeField]
    private Sprite[] _livesSprites;
    [SerializeField]
    private TextMeshProUGUI _gameOverText;
     [SerializeField]
     private TextMeshProUGUI _reStartKey;
     private GameManager _gameManager;



      void Start()
    {
        _scoreText.text = "Score: " + 0;
        _gameOverText.gameObject.SetActive(false);
       _reStartKey.gameObject.SetActive(false);
       _gameManager = GameObject.Find("Game_Manager").GetComponent<GameManager>();

     if(_gameManager == null) {
      Debug.LogError("Game Manager is Null");
     }
    }

    public void UpdatedScore(int playerScore)
    {
      _scoreText.text = "Score: " + playerScore.ToString();
    }

    public void CheckForBestScore(int _bestScore)
    {
    bestText.text = "Best: " + _bestScore.ToString();

    }

public void UpdateLives(int cuurentLives)
{
  _LivesImg.sprite = _livesSprites[cuurentLives];
  if(cuurentLives==0) {
    GameOverSequence();
  }
  }

void GameOverSequence()
{
  _gameManager.GameOver();
  _gameOverText.gameObject.SetActive(true);
    StartCoroutine(GameOverFlickerRoutine());
    _reStartKey.gameObject.SetActive(true);
}

IEnumerator GameOverFlickerRoutine()
{
  while(true)
  {
    _gameOverText.text = "GAME OVER";
    yield return new WaitForSeconds(0.5f);
    _gameOverText.text = "";
    yield return new WaitForSeconds(0.5f);
  }
}

//Resume Play
public void ResumePlay()
{
  GameManager gm = GameObject.Find("Game_Manager").GetComponent<GameManager>();
  gm.ResumeGame();
}

// BackToMainMenu
public void BackToMainMenu()