using System.Collections;
using UnityEngine;

/// <summary>
/// Анимирует появление UI панелей с эффектом разворачивания
/// </summary>
public class UIPanelAnimator : MonoBehaviour
{
    [Header("Animation Settings")]
    [SerializeField] private float animationDuration = 0.5f;
    [SerializeField] private AnimationCurve scaleCurve = AnimationCurve.EaseInOut(0, 0, 1, 1);
    [SerializeField] private bool animateOnEnable = true;
    
    private RectTransform rectTransform;
    private CanvasGroup canvasGroup;
    private Vector3 originalScale;
    private Coroutine animationCoroutine;

    private void Awake()
    {
        rectTransform = GetComponent<RectTransform>();
        if (rectTransform == null)
            rectTransform = gameObject.AddComponent<RectTransform>();

        canvasGroup = GetComponent<CanvasGroup>();
        if (canvasGroup == null)
            canvasGroup = gameObject.AddComponent<CanvasGroup>();

        originalScale = rectTransform.localScale;
    }

    private void OnEnable()
    {
        if (animateOnEnable)
            PlayShowAnimation();
    }

    /// <summary>
    /// Запускает анимацию появления панели
    /// </summary>
    public void PlayShowAnimation()
    {
        if (animationCoroutine != null)
            StopCoroutine(animationCoroutine);

        animationCoroutine = StartCoroutine(ShowAnimationCoroutine());
    }

    /// <summary>
    /// Запускает анимацию появления панели с задержкой
    /// </summary>
    public void PlayShowAnimationWithDelay(float delay)
    {
        if (animationCoroutine != null)
            StopCoroutine(animationCoroutine);

        animationCoroutine = StartCoroutine(ShowAnimationWithDelayCoroutine(delay));
    }

    /// <summary>
    /// Запускает анимацию скрытия панели
    /// </summary>
    public void PlayHideAnimation(System.Action onComplete = null)
    {
        if (animationCoroutine != null)
            StopCoroutine(animationCoroutine);

        animationCoroutine = StartCoroutine(HideAnimationCoroutine(onComplete));
    }

    private IEnumerator ShowAnimationWithDelayCoroutine(float delay)
    {
        // Начальное состояние - невидимая и маленькая
        rectTransform.localScale = Vector3.zero;
        canvasGroup.alpha = 0f;

        yield return new WaitForSeconds(delay);

        yield return ShowAnimationCoroutine();
    }

    private IEnumerator ShowAnimationCoroutine()
    {
        // Начальное состояние
        rectTransform.localScale = Vector3.zero;
        canvasGroup.alpha = 0f;

        float elapsed = 0f;

        while (elapsed < animationDuration)
        {
            elapsed += Time.deltaTime;
            float t = elapsed / animationDuration;
            float curveValue = scaleCurve.Evaluate(t);

            // Анимация масштаба (разворачивание)
            rectTransform.localScale = originalScale * curveValue;

            // Анимация прозрачности
            canvasGroup.alpha = curveValue;

            yield return null;
        }

        // Финальное состояние
        rectTransform.localScale = originalScale;
        canvasGroup.alpha = 1f;

        animationCoroutine = null;
    }

    private IEnumerator HideAnimationCoroutine(System.Action onComplete)
    {
        float elapsed = 0f;

        while (elapsed < animationDuration)
        {
            elapsed += Time.deltaTime;
            float t = 1f - (elapsed / animationDuration);
            float curveValue = scaleCurve.Evaluate(t);

            // Анимация масштаба (сворачивание)
            rectTransform.localScale = originalScale * curveValue;

            // Анимация прозрачности
            canvasGroup.alpha = curveValue;

            yield return null;
        }

        // Финальное состояние
        rectTransform.localScale = Vector3.zero;
        canvasGroup.alpha = 0f;

        animationCoroutine = null;
        onComplete?.Invoke();
    }

    private void OnDisable()
    {
        if (animationCoroutine != null)
        {
            StopCoroutine(animationCoroutine);
            animationCoroutine = null;
        }

        // Сброс к исходному состоянию
        if (rectTransform != null)
            rectTransform.localScale = originalScale;
        if (canvasGroup != null)
            canvasGroup.alpha = 1f;
    }
}