using System;
using DG.Tweening;
using UnityEngine;

namespace AibisDream.UI
{
    public class TerminalPanelAnimator : MonoBehaviour
    {
        [SerializeField] private CanvasGroup canvasGroup;
        [SerializeField] private RectTransform sweep;

        [Header("终端风格")]
        [SerializeField, Range(0f, 1f)] private float visibleAlpha = 0.88f;
        [SerializeField] private float fadeDuration = 0.06f;
        [SerializeField] private Ease showEase = Ease.Linear;
        [SerializeField] private Ease hideEase = Ease.Linear;
        [SerializeField] private float sweepDuration = 0.08f;

        private Tween _activeTween;

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

        /// <param name="onComplete">淡入完成回调。</param>
        /// <param name="prepare">在 SetActive 之前执行的内容准备（赋值、布局等）。</param>
        public void Show(Action onComplete = null, Action prepare = null)
        {
            _activeTween?.Kill();
            prepare?.Invoke();

            if (canvasGroup != null)
            {
                canvasGroup.alpha = 0f;
                canvasGroup.interactable = false;
                canvasGroup.blocksRaycasts = false;
            }

            PrepareSweep();
            gameObject.SetActive(true);
            Canvas.ForceUpdateCanvases();

            if (canvasGroup == null)
            {
                onComplete?.Invoke();
                return;
            }

            var sequence = DOTween.Sequence().SetUpdate(true);
            sequence.Join(canvasGroup.DOFade(visibleAlpha, fadeDuration).SetEase(showEase));
            if (sweep != null)
            {
                sequence.Join(sweep.DOAnchorPosX(0f, sweepDuration).SetEase(Ease.Linear));
            }

            sequence.OnComplete(() =>
            {
                canvasGroup.interactable = true;
                canvasGroup.blocksRaycasts = true;
                onComplete?.Invoke();
            });
            _activeTween = sequence;
        }

        public void Hide(Action onComplete = null)
        {
            _activeTween?.Kill();

            if (canvasGroup == null)
            {
                gameObject.SetActive(false);
                onComplete?.Invoke();
                return;
            }

            canvasGroup.interactable = false;
            canvasGroup.blocksRaycasts = false;

            _activeTween = canvasGroup
                .DOFade(0f, fadeDuration)
                .SetEase(hideEase)
                .SetUpdate(true)
                .OnComplete(() =>
                {
                    gameObject.SetActive(false);
                    onComplete?.Invoke();
                });
        }

        private void PrepareSweep()
        {
            if (sweep == null)
            {
                return;
            }

            var width = ((RectTransform)transform).rect.width;
            sweep.anchoredPosition = new Vector2(-width * 0.08f, sweep.anchoredPosition.y);
        }
    }
}