1using UnityEngine;
2using UnityEngine.UI;
3using TMPro;
4using System.Collections;
5
6/// <summary>
7/// SpaceRunnerHUD - Mobile-optimized heads-up display with
8/// animated score, combo counter, health bar, and game-over overlay.
9/// </summary>
10public class SpaceRunnerHUD : MonoBehaviour
11{
12    [Header("Score Display")]
13    [SerializeField] private TextMeshProUGUI scoreText;
14    [SerializeField] private TextMeshProUGUI highScoreText;
15    [SerializeField] private float scoreLerpSpeed = 8f;
16
17    [Header("Combo Counter")]
18    [SerializeField] private TextMeshProUGUI comboText;
19    [SerializeField] private TextMeshProUGUI multiplierText;
20    [SerializeField] private Animator comboAnimator;
21    [SerializeField] private Image comboFillBar;
22
23    [Header("Health Bar")]
24    [SerializeField] private Image healthFill;
25    [SerializeField] private Image healthDamageFlash;
26    [SerializeField] private Gradient healthGradient;
27
28    [Header("Game Over")]
29    [SerializeField] private CanvasGroup gameOverPanel;
30    [SerializeField] private TextMeshProUGUI finalScoreText;
31    [SerializeField] private TextMeshProUGUI gameOverHighScoreText;
32    [SerializeField] private Button restartButton;
33    [SerializeField] private Button menuButton;
34    [SerializeField] private float fadeInDuration = 0.8f;
35
36    private int displayedScore;
37    private float targetHealthFill = 1f;
38
39    private void Start()
40    {
41        if (gameOverPanel != null)
42        {
43            gameOverPanel.alpha = 0f;
44            gameOverPanel.gameObject.SetActive(false);
45        }
46        restartButton?.onClick.AddListener(OnRestartClicked);
47    }
48
49    private void Update()
50    {
51        AnimateScore();
52        AnimateHealthBar();
53    }
54
55    public void UpdateScore(int score)
56    {
57        displayedScore = score;
58    }
59
60    public void UpdateCombo(int combo)
61    {
62        if (comboText != null)
63        {
64            comboText.text = combo > 0 ? $"x{combo}" : "";
65            comboText.gameObject.SetActive(combo > 0);
66        }
67        if (multiplierText != null && combo > 0)
68        {
69            float mult = 1f + (combo * 0.25f);
70            multiplierText.text = $"{mult:F1}x";
71        }
72        if (comboFillBar != null)
73        {
74            comboFillBar.fillAmount = combo / 10f;
75        }
76        comboAnimator?.SetTrigger("Pulse");
77    }
78
79    public void UpdateHealth(float normalized)
80    {
81        targetHealthFill = Mathf.Clamp01(normalized);
82        if (healthDamageFlash != null)
83            StartCoroutine(FlashDamage());
84    }
85
86    public void ShowGameOver(int finalScore, int highScore)
87    {
88        if (gameOverPanel == null) return;
89        gameOverPanel.gameObject.SetActive(true);
90        if (finalScoreText != null) finalScoreText.text = finalScore.ToString("N0");
91        if (gameOverHighScoreText != null) gameOverHighScoreText.text = $"Best: {highScore:N0}";
92        StartCoroutine(FadeInGameOver());
93    }
94
95    private void AnimateScore()
96    {
97        if (scoreText != null)
98            scoreText.text = displayedScore.ToString("N0");
99    }
100
101    private void AnimateHealthBar()
102    {
103        if (healthFill == null) return;
104        healthFill.fillAmount = Mathf.Lerp(healthFill.fillAmount, targetHealthFill, 6f * Time.deltaTime);
105        healthFill.color = healthGradient.Evaluate(healthFill.fillAmount);
106    }
107
108    private IEnumerator FlashDamage()
109    {
110        if (healthDamageFlash == null) yield break;
111        healthDamageFlash.color = new Color(1f, 0f, 0f, 0.5f);
112        float t = 0f;
113        while (t < 0.3f)
114        {
115            t += Time.deltaTime;
116            Color c = healthDamageFlash.color;
117            c.a = Mathf.Lerp(0.5f, 0f, t / 0.3f);
118            healthDamageFlash.color = c;
119            yield return null;
120        }
121    }
122
123    private IEnumerator FadeInGameOver()
124    {
125        float t = 0f;
126        while (t < fadeInDuration)
127        {
128            t += Time.unscaledDeltaTime;
129            gameOverPanel.alpha = t / fadeInDuration;
130            yield return null;
131        }
132        gameOverPanel.alpha = 1f;
133    }
134
135    private void OnRestartClicked()
136    {
137        UnityEngine.SceneManagement.SceneManager.LoadScene(
138            UnityEngine.SceneManagement.SceneManager.GetActiveScene().buildIndex
139        );
140    }
141}