using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// Полноэкранный визуальный эффект акустического ослепления (подавления чувств).
/// Активируется во время крика Босса: полностью затемняет экран и гасит эхолокацию.
/// </summary>
public class AcousticJammerOverlay : MonoBehaviour
{
    private Image overlayImage;
    private CanvasGroup canvasGroup;

    private float currentAlpha = 0f;

    public static AcousticJammerOverlay Create(Transform hudCanvas)
    {
        var old = hudCanvas.Find("AcousticJammerOverlay");
        if (old != null) DestroyImmediate(old.gameObject);

        GameObject root = new GameObject("AcousticJammerOverlay", typeof(RectTransform), typeof(CanvasGroup));
        root.transform.SetParent(hudCanvas, false);

        RectTransform rt = root.GetComponent<RectTransform>();
        rt.anchorMin = Vector2.zero;
        rt.anchorMax = Vector2.one;
        rt.sizeDelta = Vector2.zero;

        // Черный экран с легким темно-багровым оттенком
        GameObject imgObj = new GameObject("VignetteBlackout", typeof(RectTransform), typeof(CanvasRenderer), typeof(Image));
        imgObj.transform.SetParent(root.transform, false);
        RectTransform imgRt = imgObj.GetComponent<RectTransform>();
        imgRt.anchorMin = Vector2.zero;
        imgRt.anchorMax = Vector2.one;
        imgRt.sizeDelta = Vector2.zero;

        Image img = imgObj.GetComponent<Image>();
        img.color = new Color(0.01f, 0.005f, 0.005f, 0.98f);
        img.raycastTarget = false;

        AcousticJammerOverlay overlay = root.AddComponent<AcousticJammerOverlay>();
        overlay.overlayImage = img;
        overlay.canvasGroup = root.GetComponent<CanvasGroup>();
        overlay.canvasGroup.alpha = 0f;
        overlay.canvasGroup.blocksRaycasts = false;
        overlay.canvasGroup.interactable = false;

        return overlay;
    }

    private void Awake()
    {
        if (canvasGroup == null) canvasGroup = GetComponent<CanvasGroup>();
    }

    private void Update()
    {
        bool isBlinded = EchoTrigger.Instance != null && EchoTrigger.Instance.IsBlinded;
        float targetAlpha = isBlinded ? 1f : 0f;
        float speed = isBlinded ? 14f : 3.5f; // Мгновенно ослепляет, плавно возвращает зрение

        currentAlpha = Mathf.MoveTowards(currentAlpha, targetAlpha, speed * Time.deltaTime);

        if (canvasGroup != null)
        {
            canvasGroup.alpha = currentAlpha;
        }
    }
}