using Assets.Scenes.Ride.Scripts.Model;
using Assets.Scripts;
using System;
using System.Linq;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace Assets.Scenes.Ride.Scripts
{
    public class BaseListFactory : MonoBehaviour
    {
        protected AbstractPlayer playerController;
        protected CyclingController cyclingController;

        protected GameObject nearByItem;
        protected GameObject nearByMajorItem;
        protected GameObject scroll;
        protected Transform parent { get; set; }
        private GameObject body;

        protected int totalPages = 0;
        protected int bufferSize = 0;
        protected int pageIndex = 1;
        protected int pageSize = 5;
        private int preNum = 0;//前面的数量
        private int offset = 8;//显示区域的数量

        protected bool startMouse = false;
        protected float t = 1f;

        protected virtual void Awake()
        {
            scroll = transform.parent.parent.gameObject;
            parent = transform;
            if (scroll != null)
            {
                UIManager.AddEvent(scroll, UnityEngine.EventSystems.EventTriggerType.EndDrag, OnEndDrag);
            }
        }

        private void Update()
        {
            if (Input.GetAxis("Mouse ScrollWheel") != 0)
            {
                if (scroll.GetComponent<ScrollRect>().verticalNormalizedPosition <= 0 ||
                    scroll.GetComponent<ScrollRect>().verticalNormalizedPosition >= (pageIndex == 0 ? 1.2 : 1))
                {
                    startMouse = true;
                }
            }
            else
            {
                if (startMouse)
                {
                    startMouse = false;
                    OnEndDrag(null);
                }
            }

            t -= Time.deltaTime;
            while (t < 0)
            {
                //Utils.DestroyChildren(parent);
                CreateList();
                t += 1f;
            }
        }
        protected virtual void CreateList()
        {
          
        }
        protected virtual void OnEndDrag(BaseEventData arg0)
        {
            var scrollrect = scroll.GetComponent<ScrollRect>();
            if (scrollrect.verticalNormalizedPosition <= 0)
            {
                SetNextIndex();

            }
            if (scrollrect.verticalNormalizedPosition >= (pageIndex == 0 ? 1.2 : 1))
            {
                SetPreIndex();
            }
        }
        protected void SetNextIndex()
        {
            var p = pageIndex + 1;
            if (p <= totalPages)
            {
                pageIndex++;
            }
        }
        protected void SetPreIndex()
        {
            var p = pageIndex - 1;
            if (p > 0)
            {
                pageIndex--;
            }
        }
    }
}