using System;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace TKS.OutGame
{
    /// <summary>탭 + 끌기 겸용 — 가로로 끌면 끌기 콜백 · 세로로 끌면 부모 ScrollRect 로 넘긴다(목록 스크롤 유지).</summary>
    public class TapDrag : MonoBehaviour, IPointerClickHandler, IBeginDragHandler, IDragHandler, IEndDragHandler
    {
        public Action OnTap;
        public Action<PointerEventData> OnDragStart;
        public Action<PointerEventData> OnDragMove;
        public Action<PointerEventData> OnDragEnd;
        /// <summary>true = 어느 방향이든 끌기(편성 자리) · false = 가로로 끌 때만(목록 카드).</summary>
        public bool AnyDirection;

        ScrollRect scroll;
        bool forwarding;
        bool dragging;

        void Awake()
        {
            scroll = GetComponentInParent<ScrollRect>();
        }

        public void OnPointerClick(PointerEventData e)
        {
            if (e.dragging || dragging || forwarding) return;
            if (OnTap != null) OnTap();
        }

        public void OnBeginDrag(PointerEventData e)
        {
            bool horizontal = Mathf.Abs(e.delta.x) > Mathf.Abs(e.delta.y);
            if (OnDragStart != null && (AnyDirection || horizontal))
            {
                dragging = true;
                OnDragStart(e);
                return;
            }
            if (scroll != null)
            {
                forwarding = true;
                scroll.OnBeginDrag(e);
            }
        }

        public void OnDrag(PointerEventData e)
        {
            if (dragging)
            {
                if (OnDragMove != null) OnDragMove(e);
            }
            else if (forwarding && scroll != null) scroll.OnDrag(e);
        }

        public void OnEndDrag(PointerEventData e)
        {
            if (dragging)
            {
                dragging = false;
                if (OnDragEnd != null) OnDragEnd(e);
            }
            else if (forwarding && scroll != null) scroll.OnEndDrag(e);
            forwarding = false;
        }
    }
}