using UnityEngine;
using UnityEngine.UI;
using TMPro;
using DG.Tweening;
using Ashwild.Inventory;

namespace Ashwild.UI
{
    public class NotificationItemUI : MonoBehaviour
    {
        [Header("References")]
        [SerializeField] private Image iconImage;
        [SerializeField] private TextMeshProUGUI labelText;   // item name only
        [SerializeField] private TextMeshProUGUI numberText;  // signed context: +N / -N
        [SerializeField] private CanvasGroup canvasGroup;
        [SerializeField] private RectTransform rectTransform;

        private ItemData itemData;
        private int totalQuantity;
        private float hideTimer;
        private bool isHiding;

        private Tweener fadeTween;
        private Tweener slideTween;
        private Tweener punchTween;

        public ItemData ItemData => itemData;
        public RectTransform RectTransform => rectTransform;

        // A notification is either a gain (+) or a loss (-); merging only happens within the same direction.
        public bool IsGain => totalQuantity >= 0;

        public void Initialize(ItemData item, int signedQuantity, Color numberColor, float displayDuration, float slideInDuration, Ease slideInEase)
        {
            itemData = item;
            totalQuantity = signedQuantity;
            hideTimer = displayDuration;
            isHiding = false;

            if (iconImage != null)
                iconImage.sprite = item.Icon;

            if (numberText != null)
                numberText.color = numberColor;

            UpdateLabel();

            canvasGroup.alpha = 0f;
            fadeTween = canvasGroup.DOFade(1f, slideInDuration).SetEase(Ease.OutQuad);
        }

        public void AddQuantity(int signedAmount, float displayDuration)
        {
            totalQuantity += signedAmount;
            UpdateLabel();
            hideTimer = displayDuration;

            if (isHiding)
            {
                isHiding = false;
                fadeTween?.Kill();
                slideTween?.Kill();
                canvasGroup.alpha = 1f;
            }

            punchTween?.Kill();
            if (iconImage != null)
                punchTween = iconImage.transform.DOPunchScale(Vector3.one * 0.15f, 0.25f, 5, 0.5f);
        }

        private void UpdateLabel()
        {
            if (labelText != null)
                labelText.text = itemData.ItemName;

            if (numberText != null)
                numberText.text = (totalQuantity >= 0 ? "+" : "-") + Mathf.Abs(totalQuantity);
        }

        private void Update()
        {
            if (isHiding) return;

            hideTimer -= Time.deltaTime;
            if (hideTimer <= 0f)
                Hide();
        }

        public void Hide()
        {
            if (isHiding) return;
            isHiding = true;

            fadeTween?.Kill();
            slideTween?.Kill();

            fadeTween = canvasGroup.DOFade(0f, 0.3f).SetEase(Ease.InQuad);
            slideTween = rectTransform.DOAnchorPosX(rectTransform.anchoredPosition.x - 200f, 0.3f)
                .SetEase(Ease.InQuad)
                .OnComplete(() => Destroy(gameObject));
        }

        private void OnDestroy()
        {
            fadeTween?.Kill();
            slideTween?.Kill();
            punchTween?.Kill();
        }
    }
}