using System;
using UnityEngine;
using FairyGUI;
using Game.Battle;

namespace Game
{
    public class PageWeapon : UIPageBase<ViewWeapon>
    {
        private int _indexNow = 0;
        private float _weaponListShowTime = 0;
        public PageWeapon()
        {
        }
        protected override void OnCreate()
        {
            CreateUI(false);
            InitWeaponList();
        }
        protected override void OnDestroy()
        {
        }
        protected override void OnOpen()
        {
        }
        protected override void OnClose()
        {
        }
        public override void Update()
        {
            if (_weaponListShowTime == 0)
            {
                return;
            }
            _weaponListShowTime -= Time.deltaTime;
            if (_weaponListShowTime <= 0)
            {
                _weaponListShowTime = 0;
                SetListShow(false);
            }

        }
        private void InitWeaponList()
        {
            var master = Util.GetMaster();
            var combo = master.combo;
            _indexNow = combo.WeaponNow.Value;

            View.m_WeaponList.RemoveChildrenToPool();
            View.m_WeaponList.SetVirtualAndLoop();
            View.m_WeaponList.itemRenderer = (int index, GObject obj) =>
            {
                var count = combo.WeaponList.Count;
                var targetIndex = (index) % count;
                var item = (obj as ViewWeaponItem);
                item.m_index.text = $"{index}";

                var weaponId = combo.WeaponList[targetIndex];
                var cfg = Util.GetWeaponConfig(weaponId);

                item.m_item.m_name.text = cfg.WeaponBasic.Name;
                item.m_item.m_icon.texture = Texture(cfg.WeaponBasic.Icon);
                item.m_item.m_icon_back.texture = Texture(cfg.WeaponBasic.Icon);

                RefreshItemStatu(item);
            };

            var count = combo.WeaponList.Count;
            var listCount = count * 2;
            View.m_WeaponList.numItems = listCount;

            var targetIndex = (_indexNow - 2 + listCount) % listCount;
            View.m_WeaponList.ScrollToView(targetIndex, true, true);
        }
        protected override void OnCreateBind()
        {
            var master = Util.GetMaster();
            BindWeapon(master);      //绑定武器
        }
        private void BindWeapon(GameEntity entity)
        {
            var combo = entity.combo;
            BindData(combo.WeaponNow, (_, now) =>
            {
                var count = combo.WeaponList.Count;
                var listCount = count * 2;
                var now2 = now + count;
                var indexPre = _indexNow;
                if (Distance(_indexNow, now, listCount) < Distance(_indexNow, now2, listCount))
                {
                    _indexNow = now;
                }
                else
                {
                    _indexNow = now2;
                }
                if (indexPre == _indexNow)
                {
                    return;
                }
                if (View.m_c1.selectedIndex == 0)
                {
                    SetListShow(true);
                }
                else
                {
                    var moveDistance = DistanceDir(indexPre, _indexNow, listCount);
                    if (moveDistance > 0)
                    {
                        View.m_WeaponList.scrollPane.ScrollRight(Math.Abs(moveDistance), true);
                    }
                    else
                    {
                        View.m_WeaponList.scrollPane.ScrollLeft(Math.Abs(moveDistance), true);
                    }
                }
                _weaponListShowTime = GameConst.WeaponListShowTime;

                foreach (var itemObj in View.m_WeaponList.GetChildren())
                {
                    RefreshItemStatu(itemObj as ViewWeaponItem);
                }
            });
        }
        private void SetListShow(bool isShow)
        {
            if (isShow)
            {
                var master = Util.GetMaster();
                var combo = master.combo;
                var count = combo.WeaponList.Count;
                var listCount = count * 2;
                var targetIndex = (_indexNow - 2 + listCount) % listCount;
                View.m_WeaponList.ScrollToView(targetIndex, false, true);
            }
            View.m_c1.selectedIndex = isShow ? 1 : 0;
        }
        private void RefreshItemStatu(ViewWeaponItem item)
        {
            var master = Util.GetMaster();
            var combo = master.combo;
            var count = combo.WeaponList.Count;
            var listCount = count * 2;
            var itemIndex = Int32.Parse(item.m_index.text);
            //调整大小
            var isChosen = itemIndex == _indexNow;
            item.m_c1.selectedIndex = isChosen ? 1 : 0;
            item.m_item.m_c1.selectedIndex = isChosen ? 1 : 0;
            //调整显示
            var distance = DistanceDir(_indexNow, itemIndex, listCount);
            var isShow = distance >= -1 && distance <= 2;
            item.m_c2.selectedIndex = isShow ? 0 : 1;
        }
        private int DistanceDir(int i1, int i2, int max)
        {
            if (i1 == i2)
            {
                return 0;
            }
            var distance1 = 0;//往右
            var distance2 = 0;//往左

            if (i2 > i1)
            {
                distance1 = i2 - i1;
                distance2 = i1 - i2 + max;
            }
            else
            {
                distance1 = i2 - i1 + max;
                distance2 = i1 - i2;
            }
            if (Mathf.Abs(distance1) > Mathf.Abs(distance2))
            {
                return -distance2;
            }
            else
            {
                return distance1;
            }
        }
        private int Distance(int i1, int i2, int max)
        {
            return Mathf.Abs(DistanceDir(i1, i2, max));
        }
    }
}