using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using AX.MessageSystem;
[RequireComponent(typeof(Image))]
public class DragVertice : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IDragHandler, IEndDragHandler
{
    public PolygonController PolygonController;
    RaycastHit hit;
    public Canvas Canvas;
    private int index;
    private Image image;
    private Color originalColor;//ԭʼ��ɫ
    public static GameObject selectedObj;
    private GameObject addPanel;
    private Toggle addToggle;
    private Button delButton;
    public bool IsOnDrag;
    private void Start()
    {
        if (!Canvas)
            Canvas = GameObject.Find("Canvas").GetComponent<Canvas>();
        image = GetComponent<Image>();
        originalColor = image.color;
        addPanel = transform.parent.parent.Find("VerticeAddPanel").gameObject;
        addToggle = addPanel.transform.Find("Add").GetComponent<Toggle>();
        delButton = addPanel.transform.Find("DelButton").GetComponent<Button>();
        delButton.onClick.AddListener(DelVertice);
        MessageDispatcher.AddListener("SelectedVertice", ChangeColor);
    }

    private void OnDestroy()
    {
        MessageDispatcher.RemoveListener("SelectedVertice", ChangeColor);
    }
    private void Update()
    {
        if (Input.GetButtonDown("Fire1") && addToggle.isOn)
        {
            if (selectedObj == this.gameObject)
            {
                if (!EventSystem.current.IsPointerOverGameObject())
                {
                    Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
                    var rayCast = getRayCastAll(ray);
                    if (rayCast)
                    {
                        PolygonController.AddPolygon(index + 1, hit.point, Input.mousePosition);
                        /*if (PolygonController.GetComponent<CloneGameObjInfo>().gameObjType == CloneObjType.EvacuationExit)
                        {
                            MessageDispatcher.SendMessage("SaveEvacuationExit", PolygonController.gameObject);
                        }*/
                    }
                }
            }
        }
        if (Input.GetButtonUp("Fire1") && addToggle.isOn)
        {
            if (selectedObj == this.gameObject)
            {
                if (!EventSystem.current.IsPointerOverGameObject())
                {
                    Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
                    var rayCast = getRayCastAll(ray);
                    if (rayCast)
                    {
                        PolygonController.AddPolygon(index + 1, hit.point, Input.mousePosition);
                        /*if (PolygonController.GetComponent<CloneGameObjInfo>().gameObjType == CloneObjType.EvacuationExit)
                        {
                            MessageDispatcher.SendMessage("SaveEvacuationExit", PolygonController.gameObject);
                        }*/
                    }
                }
            }
        }
        if (Input.GetButtonDown("Fire2") && addToggle.isOn)
        {
            addToggle.isOn = false;
        }
    }
    private void ChangeColor(IMessage obj)
    {
        if (selectedObj != this.gameObject)
        {
            image.color = originalColor;
        }
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (!PolygonController.Editable)
            return;

        Vector2 anchoredPosition;

        if (RectTransformUtility.ScreenPointToLocalPointInRectangle(Canvas.transform as RectTransform, eventData.position, null, out anchoredPosition))
        {
            if (index >= 0 && PolygonController.ChangePosition(index, eventData.position))
            {
                IsOnDrag = true;
                (transform as RectTransform).anchoredPosition = anchoredPosition;
            }
        }
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        index = PolygonController.FindIndex(eventData.position);
        selectedObj = this.gameObject;
        image.color = Color.red;
        addPanel.SetActive(true);
        MessageDispatcher.SendMessage("SelectedVertice");
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        if (IsOnDrag)
        {
            IsOnDrag = false;
        }
    }
    private void OnDisable()
    {
        if (selectedObj == this.gameObject)
        {
            selectedObj = null;
            image.color = originalColor;
            addPanel.SetActive(false);
        }
    }
    private void DelVertice()
    {
        if (selectedObj == this.gameObject)
        {
            if (index < 0)
            {
                Debug.Log($"-><color=#CD2200>{"index小于0"}</color>");
                return;
            }
            PolygonController.DelPolygon(index);
            if (PolygonController.worldPositions.Count < 0)
            {
                return;
            }
            if (index == 0)
            {
                PolygonController.transform.Find("info").transform.position = PolygonController.worldPositions[0];
            }
        }
    }

    private bool getRayCastAll(Ray ray)
    {
        bool rayCast = false;
        //Ray ray = Camera.main.ScreenPointToRay(point); 
        RaycastHit[] hits;
        //int notRendering = LayerMask.NameToLayer("NotRendering");
        int ignoreRaycast = LayerMask.NameToLayer("NotRendering");
        hits = Physics.RaycastAll(ray, Mathf.Infinity, ~(1 << ignoreRaycast));
        System.Array.Sort(hits, (r1, r2) => r1.distance.CompareTo(r2.distance));
        for (var i = 0; i < hits.Length; i++)
        {
            var hitpoint = hits[i];
            var renderer = hitpoint.collider.GetComponent<Renderer>();
            if (renderer)
            {
                if (renderer.enabled)
                {
                    rayCast = true;
                    hit = hitpoint;
                    //Debug.Log("----->"+hit.collider.name);
                    break;
                }
            }
            else
            {
                var renderers = hitpoint.transform.GetComponentsInChildren<Renderer>();
                for (int k = 0; k < renderers.Length; k++)
                {
                    if (renderers[k].enabled)
                    {
                        rayCast = true;
                        hit = hitpoint;
                        //Debug.Log("----->"+hit.collider.name);
                        break;
                    }
                }
                if (rayCast)
                {
                    break;
                }
            }
        }
        return rayCast;
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        if (!PolygonController.Editable)
            return;

        Vector2 anchoredPosition;

        if (RectTransformUtility.ScreenPointToLocalPointInRectangle(Canvas.transform as RectTransform, eventData.position, null, out anchoredPosition))
        {
            if (index >= 0 && PolygonController.ChangePosition(index, eventData.position, true))
            {
                IsOnDrag = true;
                (transform as RectTransform).anchoredPosition = anchoredPosition;
            }
        }
    }
}