using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

namespace MMO
{
    public class MMOUIManager : MonoBehaviour
    {
        public bool IsUICovered
        {
            get
            {
                return mUIList.Count > 0;
            }
        }

        public Canvas UICanvas
        {
            get
            {
                if (mUICanvas == null)
                {
                    mUICanvas = GetComponent<Canvas>();
                }

                return mUICanvas;
            }
        }

        public Camera UICamera
        {
            get
            {
                if (mUICamera == null)
                {
                    mUICamera = UICanvas.worldCamera;
                }

                return mUICamera;
            }
        }

        private Canvas mUICanvas;
        private Camera mUICamera;
        private Dictionary<Type, MMOUIBase> mUIDic = new Dictionary<Type, MMOUIBase>();
        private List<MMOUIBase> mUIList = new List<MMOUIBase>();

        public T OpenUI<T>() where T : MMOUIBase
        {
            T tUI = GetUI<T>();
            tUI.gameObject.SetActive(true);
            tUI.OnOpen();

            if (tUI.IsStack)
            {
                if (mUIList.Contains(tUI))
                {
                    mUIList.Remove(tUI);
                }
                if (mUIList.Count > 0)
                {
                    mUIList[mUIList.Count - 1].OnFocus(false);
                }
                mUIList.Add(tUI);
            }

            return tUI;
        }

        public T CloseUI<T>() where T : MMOUIBase
        {
            T tUI = GetUI<T>();
            CloseUI(tUI);

            return tUI;
        }

        public void CloseUI(MMOUIBase pMMOUIBase)
        {
            if (pMMOUIBase.IsStack)
            {
                int tIndex = mUIList.IndexOf(pMMOUIBase);
                if (tIndex == mUIList.Count - 1)
                {
                    mUIList.Remove(pMMOUIBase);
                    if (mUIList.Count > 0)
                    {
                        mUIList[mUIList.Count - 1].OnFocus(true);
                    }
                }
                else
                {
                    mUIList.Remove(pMMOUIBase);
                }
            }

            pMMOUIBase.gameObject.SetActive(false);
            pMMOUIBase.OnClose();
        }

        public T GetUI<T>() where T : MMOUIBase
        {
            T tUI = null;
            if (!mUIDic.ContainsKey(typeof(T)))
            {
                mUIDic[typeof(T)] = GetComponentInChildren<T>(true);
            }

            tUI = mUIDic[typeof(T)] as T;

            return tUI;
        }

        public void CloseAll()
        {
            for (int i = mUIList.Count - 1; i >= 0; i--)
            {
                CloseUI(mUIList[i]);
            }
        }

        public static bool IsTouchUI()
        {
            if (EventSystem.current != null)
            {
                PointerEventData eventData = new PointerEventData(EventSystem.current);
                eventData.position = Input.mousePosition;
                List<RaycastResult> results = new List<RaycastResult>();
                EventSystem.current.RaycastAll(eventData, results);
                if (results == null || results.Count == 0)
                {
                    return false;
                }
                return results.Count > 0 && results[0].gameObject.layer == 5;
            }
            return false;
        }

        public static List<GameObject> GetChildGobList(Transform pParent)
        {
            List<GameObject> tList = new List<GameObject>();

            for (int i = 0; i < pParent.childCount; i++)
            {
                tList.Add(pParent.GetChild(i).gameObject);
            }

            return tList;
        }

        public static List<T> GetChildList<T>(Transform pParent)
        {
            List<T> tList = new List<T>();

            for (int i = 0; i < pParent.childCount; i++)
            {
                tList.Add(pParent.GetChild(i).GetComponent<T>());
            }

            return tList;
        }
    }
}