using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.UI;
namespace DongWuYiXue.DaoNiaoShu
{
    public class DragManager : MonoBehaviour
    {
        private List<Drag> drags = new();
        [HideInInspector]
        public Drag drag;
        Drag hoverDrag;
        private void Start()
        {
            drags = GetComponentsInChildren<Drag>().ToList();
            for (int i = 0; i < drags.Count; i++)
            {
                drags[i].Init(this);
            }
        }
        public void Init()
        {
            drag = null;
            hoverDrag = null;
            for (int i = 0; i < drags.Count; i++)
            {
                drags[i].Init(this);
            }
        }
        private void Update()
        {
            if (drag != null)
            {
                hoverDrag = GetHoverDrag();
                if (hoverDrag != null)
                {
                    if (drag.rightTarget != null)
                    {
                        if (drag.rightTarget == hoverDrag)
                        {
                            drag.right = true;
                        }
                        else
                        {
                            drag.right = false;
                        }
                    }
                    else if (hoverDrag.rightTarget != null)
                    {
                        if (drag == hoverDrag.rightTarget)
                        {
                            drag.right = true;
                        }
                        else
                        {
                            drag.right = false;
                        }
                    }
                }

            }
        }
        public void DragEnd()
        {
            if (drag != null && hoverDrag != null)
            {
                drag.rectTransform.position = hoverDrag.rectTransform.position;
                drag.yourTarget = hoverDrag;
                hoverDrag.yourTarget = drag;
                hoverDrag.hoverImage.SetActive(false);
            }
            else
            {
                drag.ResetPos();
            }
            drag = null;
            hoverDrag = null;
        }

        Drag GetHoverDrag()
        {
            for (int i = 0; i < drags.Count; i++)
            {
                Drag d = drags[i];
                if (drag.group != d.group && d.hoverImage.activeSelf && !HasDrag(d))
                {
                    return d;
                }
            }
            return null;
        }
        /// <summary>
        /// 判断该物体是否已经被其他物体所拖拽
        /// </summary>
        bool HasDrag(Drag d)
        {
            for (int i = 0; i < drags.Count; i++)
            {
                if (drags[i].yourTarget != null)
                {
                    if (drags[i].yourTarget == d)
                    {
                        return true;
                    }
                }
            }
            return false;
        }

        public void DisPlayResult()
        {
            for (int i = 0; i < drags.Count; i++)
            {
                if (drags[i].right && drags[i].drag)
                {
                    drags[i].rightImage.SetActive(true);
                }
                else if (drags[i].drag)
                {
                    drags[i].falseImage.SetActive(true);
                }
            }
        }
        public bool CheckAllDrag()
        {
            for (int i = 0; i < drags.Count; i++)
            {
                if (!drags[i].right && drags[i].drag)
                {
                    return false;
                }
            }
            return true;
        }
        public string GetYourAnswer()
        {
            string str = "";
            for (int i = 0; i < drags.Count; i++)
            {
                if (!drags[i].drag && drags[i].yourTarget != null)
                {
                    str += drags[i].yourTarget.dragName;
                }
            }
            if (string.IsNullOrEmpty(str))
            {
                return "用户未作答";
            }
            return str;
        }
    }
}