using System;
using System.Collections.Generic;
using AlicizaX.Runtime;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.UI;
using Object = UnityEngine.Object;

namespace AlicizaX.UI.Runtime
{
    public abstract partial class UIWindow : UIBase
    {
        internal Canvas _canvas;
        internal Canvas[] _childCanvas;

        internal GraphicRaycaster _raycaster;
        internal GraphicRaycaster[] _childRaycaster;


        public override string AssetName
        {
            get => gameObject.name;
        }

        private bool mVisible;

        public override bool Visible
        {
            get
            {
                if (_canvas != null)
                {
                    return _canvas.gameObject.layer == UIComponent.WINDOW_SHOW_LAYER;
                }
                else
                {
                    return false;
                }
            }

            set
            {
                if (value == mVisible)
                {
                    return;
                }

                if (value)
                {
                    OnRegisterEvent();
                }
                else
                {
                    RemoveAllUIEvent();
                }

                mVisible = value;

                if (_canvas != null)
                {
                    int setLayer = value ? UIComponent.WINDOW_SHOW_LAYER : UIComponent.WINDOW_HIDE_LAYER;
                    if (_canvas.gameObject.layer == setLayer)
                        return;

                    _canvas.gameObject.layer = setLayer;
                    for (int i = 0; i < _childCanvas.Length; i++)
                    {
                        _childCanvas[i].gameObject.layer = setLayer;
                    }

                    Interactable = value;
                }
            }
        }

        private bool Interactable
        {
            get
            {
                if (_raycaster != null)
                {
                    return _raycaster.enabled;
                }
                else
                {
                    return false;
                }
            }

            set
            {
                if (_raycaster != null)
                {
                    _raycaster.enabled = value;
                    for (int i = 0; i < _childRaycaster.Length; i++)
                    {
                        _childRaycaster[i].enabled = value;
                    }
                }
            }
        }

        /// <summary>
        /// 窗口深度值。
        /// </summary>
        public int Depth
        {
            get
            {
                if (_canvas != null)
                {
                    return _canvas.sortingOrder;
                }
                else
                {
                    return 0;
                }
            }

            set
            {
                if (_canvas != null)
                {
                    if (_canvas.sortingOrder == value)
                    {
                        return;
                    }

                    // 设置父类
                    _canvas.sortingOrder = value;

                    // 设置子类
                    int depth = value;
                    for (int i = 0; i < _childCanvas.Length; i++)
                    {
                        var canvas = _childCanvas[i];
                        if (canvas != _canvas)
                        {
                            depth += 5; //注意递增值
                            canvas.sortingOrder = depth;
                        }
                    }
                }
            }
        }


        internal void InternalCreate(GameObject panel)
        {
            if (panel == null)
            {
                return;
            }

            panel.name = GetType().Name;
            gameObject = panel;
            panel.transform.localPosition = Vector3.zero;
            rectTransform.pivot = new Vector2(0.5f, 0.5f);
            rectTransform.anchorMin = Vector2.zero;
            rectTransform.anchorMax = Vector2.one;
            rectTransform.offsetMin = Vector2.zero;
            rectTransform.offsetMax = Vector2.zero;
            rectTransform.localScale = Vector3.one;
            // 获取组件
            _canvas = panel.GetComponent<Canvas>();
            if (_canvas == null)
            {
                throw new Exception($"Not found {nameof(Canvas)} in panel {AssetName}");
            }

            _canvas.overrideSorting = true;
            _canvas.sortingOrder = 0;
            _canvas.sortingLayerName = "Default";

            // 获取组件
            _raycaster = panel.GetComponent<GraphicRaycaster>();
            _childCanvas = panel.GetComponentsInChildren<Canvas>(true);
            _childRaycaster = panel.GetComponentsInChildren<GraphicRaycaster>(true);

            IsLoaded = true;
        }

        internal void RefreshParams(params System.Object[] userDatas)
        {
            this.userDatas = userDatas;
        }

        internal void InternalInitlize()
        {
            OnBindUIComponents();
            OnInitlize();
        }

        internal void InternalOpen()
        {
            Visible = true;
            OnOpen();
            WithParentVisible(true, true);
        }

        internal bool InternalUpdate()
        {
            if (!IsLoaded || !Visible)
            {
                return false;
            }

            OnUpdate();
            return true;
        }


        internal void InternalClose()
        {
            OnClose();

            Visible = false;
            CollectChildVisible();
            WithParentVisible(false, false);
        }

        internal void InternalDestroy()
        {
            DisposeEvent();
            for (int i = 0; i < childWidgets.Count; i++)
            {
                var uiChild = childWidgets[i];
                uiChild.InternalDestroy();
            }

            childWidgets.Clear();

            OnDestroy();
            if (gameObject != null)
            {
                Object.Destroy(gameObject);
                gameObject = null;
            }
        }


        protected virtual void OnUpdate()
        {
        }

        /// <summary>
        /// 关闭自己
        /// </summary>
        /// <param name="force">如果有缓存时间 指定该参数可以直接移除 长期缓存的无效</param>
        protected void CloseSelf(bool force = false)
        {
            GameEntry.GetComponent<UIComponent>().CloseUI(this.GetType(), force);
        }

        private void CollectChildVisible()
        {
            for (int i = 0; i < childWidgets.Count; i++)
            {
                var uiChild = childWidgets[i];
                if (uiChild.Visible)
                {
                    withOpenWidget.Add(uiChild);
                }
            }
        }

        private void WithParentVisible(bool visible, bool clear)
        {
            for (int i = 0; i < withOpenWidget.Count; i++)
            {
                var uiChild = withOpenWidget[i];
                if (visible)
                {
                    uiChild.InternalRegisterEvent();
                }
                else
                {
                    uiChild.InternalRemoveAllUIEvent();
                }
            }

            if (clear) withOpenWidget.Clear();
        }
    }
}