using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Utility;

namespace ProjectBase.UI
{
    public class UIViewLayerController : MonoBehaviour
    {
        public UIViewLayer viewLayer;

        private const int viewSortOrderStep = 100;

        private int topSortOrder = 0;

        private List<BaseUIView> uiViews = new List<BaseUIView>();

        public void PushUIView(BaseUIView view)
        {
            if (view == null) return;

            if (view.viewLayerController != null && view.viewLayerController == this)
            {
                if (view.ViewSortOrder == topSortOrder)
                {
                    return;
                }
                else
                {
                    uiViews.Remove(view);
                    uiViews.Add(view);
                    topSortOrder += viewSortOrderStep;
                    view.ViewSortOrder = topSortOrder;
                }
            }
            else
            {
                uiViews.Add(view);
                view.viewLayerController = this;
                view.transform.SetParent(transform);
                view.GetComponent<RectTransform>().Normalize();
                topSortOrder += viewSortOrderStep;
                view.ViewSortOrder = topSortOrder;
                view.OnPush();
            }
        }

        public void PopupUIView(BaseUIView view)
        {
            if (view == null) return;

            if (uiViews.Contains(view))
            {
                uiViews.Remove(view);
                view.ResetUIView();
                view.OnPopup();
            }
            RefreshTopSortOrder();
        }

        public void RefreshTopSortOrder()
        {
            topSortOrder = uiViews.Count == 0 ? 0 : uiViews[uiViews.Count - 1].ViewSortOrder;
        }

        public bool RefreshView(bool alreadycovered)
        {
            if (alreadycovered)
            {
                for(int i = uiViews.Count - 1; i >= 0; i--)
                {
                    if (uiViews[i].uiViewConfig.alwaysUpdate)
                    {
                        uiViews[i].OnShow();
                    }
                    else
                    {
                        uiViews[i].OnHide();
                    }
                }
                return true;
            }
            else
            {
                bool covered = false;
                for(int i = uiViews.Count - 1; i >= 0; i--)
                {
                    if (uiViews[i].uiViewConfig.alwaysUpdate)
                    {
                        uiViews[i].OnShow();
                    }
                    else
                    {
                        if (covered)
                        {
                            uiViews[i].OnHide();
                        }
                        else
                        {
                            uiViews[i].OnShow();
                        }
                    }
                    if (!covered)
                    {
                        covered = uiViews[i].uiViewConfig.coverScreen;
                    }
                }
                return covered;
            }
        }
    }
}