using System;
using System.Collections;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using DG.Tweening;

namespace UnityCommon
{
    public class SmartLabelItem : MonoBehaviour
    {
        private Transform tfLine;
        private void Awake()
        {
            tfLine = transform.Find("Line");
            (tfLine as RectTransform).sizeDelta = new Vector2(offset, (tfLine as RectTransform).sizeDelta.y);
            Hide();
        }
        [HideInInspector]
        public Transform tfTargetItem;
        //private Vector3 centerP;
        private Canvas canvas;
        private float offset = 120f;
        private float angle = 0;
        public void SetLabel(string str, Canvas canvas, Transform tfTargetItem, float angle /*Vector3 centerP*/)
        {
            var txt = GetComponentInChildren<TextMeshProUGUI>();
            txt.text = str;
            var uilistener = UIEventListener.GetListener(transform.Find("Label").GetComponent<Image>().gameObject);
            uilistener.OnEnter = OnEnter;
            uilistener.OnExit = OnExit;
            uilistener.OnClick = OnClick;
            this.tfTargetItem = tfTargetItem;
            //this.centerP = centerP;
            this.angle = angle;
            this.canvas = canvas;
        }
        public void SetOffset(float offset)
        {
            this.offset = offset;
        }
        private void Update()
        {
            if (canvas != null && isShow)
                SetPosition();
        }
        private void SetPosition()
        {
            if (Camera.main.IsInFrontOfMe(tfTargetItem))
            {
                gameObject.SetActive(true);
                gameObject.transform.localScale = Vector3.one;

                var t = Utility.WordPosition2UILocalposition(Camera.main, canvas, tfTargetItem.position);
                //var c = Utility.WordPosition2UILocalposition(Camera.main, canvas, centerP);
                //var dir = (t - c).normalized;
                var dir = Quaternion.AngleAxis(angle, Vector3.forward) * Vector3.up;
                //dir = Quaternion.Inverse(dir);
                var labelP = t + dir.normalized * offset;
                (transform as RectTransform).anchoredPosition = labelP;
                if (tfLine != null)
                {
                    //(tfLine as RectTransform).rotation = Quaternion.FromToRotation(Vector3.right, -dir);
                    (tfLine as RectTransform).rotation = Quaternion.FromToRotation(Vector3.right, -dir);
                }
            }
            else
            {
                gameObject.transform.localScale = Vector3.zero;
            }
        }

        public void SetAngle(float angle)
        {
            this.angle = angle;
        }
        public void SetLabel(string label)
        {
            var txt = GetComponentInChildren<TextMeshProUGUI>();
            txt.text = label;
        }

        private SmartLabelHelperBase helper;
        public void SetHelper(SmartLabelHelperBase helper)
        {
            this.helper = helper;
        }
        private void OnClick(GameObject go, PointerEventData pEventData)
        {
            helper?.OnClick(this);
        }

        private void OnExit(GameObject go, PointerEventData pEventData)
        {
            helper?.OnExit(this);
        }

        private void OnEnter(GameObject go, PointerEventData pEventData)
        {
            transform.SetAsLastSibling();
            helper?.OnEnter(this);
        }

        private bool isShow = false;
        public void Show()
        {
            var t = Utility.WordPosition2UILocalposition(Camera.main, canvas, tfTargetItem.position);
            //var c = Utility.WordPosition2UILocalposition(Camera.main, canvas, centerP);
            //var dir = (t - c).normalized;
            var dir = Quaternion.AngleAxis(angle, Vector3.up).eulerAngles.normalized;
            var labelP = t + dir * offset;
            var rectTF = transform as RectTransform;
            rectTF.anchoredPosition = t;

            if (tfLine != null)
            {
                tfLine.localScale = new Vector3(0, 1, 1);
                (tfLine as RectTransform).rotation = Quaternion.FromToRotation(Vector3.right, -dir);
            }
            gameObject.SetActive(true);
            rectTF.DOLocalMove(labelP, 1).onComplete = () =>
            {
                isShow = true;
            };
            tfLine.DOScale(Vector3.one, 1);
        }
        public void Hide()
        {
            isShow = false;
            gameObject.SetActive(false);
        }
    }
}