using UnityEngine;
using UnityEngine.UI;
using TMPro;

/// <summary>
/// Manages the death screen UI display and respawn button
/// </summary>
public class DeathScreenUI : MonoBehaviour
{
    public static DeathScreenUI Instance { get; private set; }

    [Header("UI References")]
    public GameObject deathPanel;
    public TextMeshProUGUI deathMessageText;
    public Button respawnButton;
    public CanvasGroup canvasGroup;
    
    [Header("Messages")]
    public string[] deathMessages = new string[]
    {
        "Your party has been defeated...",
        "Darkness consumes your party...",
        "The dungeon claims another group of heroes...",
        "Your quest has come to a tragic end..."
    };
    
    [Header("Animation Settings")]
    public float fadeInDuration = 1f;
    public bool randomizeMessage = true;

    private void Awake()
    {
        if (Instance != null && Instance != this)
        {
            Destroy(gameObject);
            return;
        }
        Instance = this;
        
        // Ensure we start hidden
        if (deathPanel != null)
            deathPanel.SetActive(false);
        
        if (canvasGroup != null)
            canvasGroup.alpha = 0f;
    }

    private void Start()
    {
        // Ensure we have required references
        if (deathPanel == null)
        {
            Debug.LogWarning("[DeathScreenUI] Death Panel not assigned! Please assign UI elements in Inspector.");
        }
        
        // Bind respawn button
        if (respawnButton != null)
        {
            respawnButton.onClick.AddListener(OnRespawnButtonClicked);
        }
        else
        {
            Debug.LogWarning("[DeathScreenUI] Respawn Button not assigned!");
        }
    }

    /// <summary>
    /// Show the death screen
    /// </summary>
    public void Show()
    {
        if (deathPanel != null)
            deathPanel.SetActive(true);
        
        // Set random death message
        if (deathMessageText != null && randomizeMessage)
        {
            string message = deathMessages[Random.Range(0, deathMessages.Length)];
            deathMessageText.text = message;
        }
        
        // Fade in
        if (canvasGroup != null)
        {
            StartCoroutine(FadeIn());
        }
        
        Debug.Log("[DeathScreenUI] Death screen shown");
    }

    /// <summary>
    /// Hide the death screen
    /// </summary>
    public void Hide()
    {
        if (canvasGroup != null)
        {
            canvasGroup.alpha = 0f;
        }
        
        if (deathPanel != null)
            deathPanel.SetActive(false);
        
        Debug.Log("[DeathScreenUI] Death screen hidden");
    }

    private System.Collections.IEnumerator FadeIn()
    {
        float elapsed = 0f;
        while (elapsed < fadeInDuration)
        {
            elapsed += Time.deltaTime;
            canvasGroup.alpha = Mathf.Lerp(0f, 1f, elapsed / fadeInDuration);
            yield return null;
        }
        canvasGroup.alpha = 1f;
    }

    private void OnRespawnButtonClicked()
    {
        Debug.Log("[DeathScreenUI] Respawn button clicked");
        
        if (GameManager.Instance != null)
        {
            GameManager.Instance.RespawnParty();
        }
        else
        {
            Debug.LogError("[DeathScreenUI] GameManager not found!");
        }
    }

}