using Gameplay.Level;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Gameplay.Common;
using Gameplay.Summon;
using Gameplay.Unit;
using Gameplay.Unit.Data;
using Gameplay.Vehicle.Impl;

namespace Gameplay.Pause
{
    using Character;
    using Framework;
    using Gameplay.Area;
    using Gameplay.Effect;
    using Gameplay.Skill;
    using UnityEngine;

    public class PauseManager
    {

        private static PauseManager _instance;

        public static PauseManager instance
        {
            get
            {
                return _instance;
            }
        }

        public static PauseManager CreateInstance()
        {
            if (_instance != null) return _instance;
            _instance = new PauseManager();
            return _instance;
        }

        private float _globalScale = 1f;
        public float globalScale
        {
            get
            {
                return _globalScale;
            }
            set
            {
                if (Math.Abs(_globalScale - value) > 0.1f)
                {
                    _globalScale = value;
                    isSpeedChanged = true;

                    // 暂停时强制更新一次
                    if (_globalScale == 0)
                    {
                        LogicUpdate(0);
                    }
                }

            }
        }

        public bool isSpeedChanged
        {
            get;
            private set;
        }

        private List<AnimatorPauser> _animList;

        private List<ParticalPauser> _paticalList;

        public void Init()
        {
            _animList = new List<AnimatorPauser>();

            _paticalList = new List<ParticalPauser>();

            // 先把场景中的绑定
            var allUnits = GameUnitManager.instance.infightUnits;
            for (int i = 0; i < allUnits.count; i++)
            {
                var unit = allUnits.GetByIndex(i);
                _AddUnit(unit);
            }

            _RegistEvents();
        }

        private void _AddUnit(GameUnit unit)
        {
            switch (unit.gameunitType)
            {
                case EGameUnitType.Character:
                    var character = unit as Character;
                    _AddCharacter(character);
                    break;
                case EGameUnitType.Vehicle:
                    var vehicle = unit as NormalVehicle;
                    _AddVehicle(vehicle);
                    break;
                case EGameUnitType.Summon:
                    var summon = unit as BaseSummon;
                    _AddSummon(summon);
                    break;
                case EGameUnitType.Player:
                    // 玩家不需要暂停
                    break;
                default:
                    DebugUtil.LogError("暂未处理的类型:{0}", unit.gameunitType);
                    break;
            }
        }

        private void _AddSummon(BaseSummon summon)
        {
            // 可能有动画
            var anims = summon.Node.GameObject.GetComponentsInChildren<Animator>();
            for (var i = 0; i < anims.Length; ++i)
            {
                var anim = anims[i];
                _AddAnim(anim, summon);
            }
            // 也可能有特效
            var particals = summon.Node.GameObject.GetComponentsInChildren<ParticleSystem>();
            for (var i = 0; i < particals.Length; ++i)
            {
                var partical = particals[i];
                _AddPartical(partical, summon);
            }
        }

        private void _AddVehicle(NormalVehicle vehicle)
        {
            // 车有两个动画,车本身一个,炮台一个
            var anim1 = vehicle.vAnim.rawAnim;
            var anim2 = vehicle.battery.rawAnim;
            if (anim1 != null)
            {
                _AddAnim(anim1, vehicle);
            }
            if (anim2 != null)
            {
                _AddAnim(anim2, vehicle);
            }
        }

        private void _AddCharacter(Character c)
        {
            var animator = c.RawAnimator;
            if (animator == null) return;
            _AddAnim(animator, c);
        }

        private void _AddAnim(Animator anim,
            GameUnit owner)
        {
            var pauser = new AnimatorPauser(anim);
            pauser.owner = owner;
            _animList.Add(pauser);
        }

        private void _AddPartical(ParticleSystem partical,
            GameUnit owner)
        {
            var pauser = new ParticalPauser(partical);
            pauser.owner = owner;
            _paticalList.Add(pauser);
        }

        private void _RegistEvents()
        {
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_UNIT_READY, (Action<GameUnit>)_OnUnitReady);
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_UNIT_REMOVE, (Action<GameUnit>)_OnUnitRemove);
            EventManager.Instance.Register(EventManager.EventName.EFFECT_INST_FINISHED, (Action<EffectPlayingData>)_OnEffectInstFinished);
            EventManager.Instance.Register(EventManager.EventName.EFFECT_INST_RETURN, (Action<EffectPlayingData>)_OnEffectInstReturn);
        }
        
        private void _UnRegistEvents()
        {
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_UNIT_READY, (Action<GameUnit>)_OnUnitReady);
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_UNIT_REMOVE, (Action<GameUnit>)_OnUnitRemove);
            EventManager.Instance.Unregister(EventManager.EventName.EFFECT_INST_FINISHED, (Action<EffectPlayingData>)_OnEffectInstFinished);
            EventManager.Instance.Unregister(EventManager.EventName.EFFECT_INST_RETURN, (Action<EffectPlayingData>)_OnEffectInstReturn);
        }

        private void _OnUnitReady(GameUnit unit)
        {
            _AddUnit(unit);
        }

        private void _OnUnitRemove(GameUnit unit)
        {
            _RemoveUnit(unit);
        }

        private void _RemoveUnit(GameUnit unit)
        {
            for (int i = 0; i < _animList.Count; i++)
            {
                var animPauser = _animList[i];
                if (animPauser.isEffect) continue;
                if (animPauser.owner == unit)
                {
                    _animList.RemoveAt(i);
                    i--;
                }
            }
            // 遍历特效
            for (int i = 0; i < _paticalList.Count; i++)
            {
                var particalPauser = _paticalList[i];
                if (particalPauser.isEffect) continue;
                if (particalPauser.owner == unit)
                {
                    _paticalList.RemoveAt(i);
                    i--;
                }
            }
        }

        private void _OnEffectInstFinished(EffectPlayingData effectData)
        {
            if (effectData.pauserData == null)
            {
                effectData.pauserData = new DataEffectPauser(effectData);
            }
            _animList.AddRange(effectData.pauserData.animPausers);
            _paticalList.AddRange(effectData.pauserData.particalPauser);
        }

        private void _OnEffectInstReturn(EffectPlayingData effectData)
        {
            var animList = effectData?.pauserData?.animPausers;
            if (animList != null)
            {
                for (int i = 0; i < animList.Count; i++)
                {
                    var animPauser = animList[i];
                    _animList.Remove(animPauser);
                }
            }
            
            var particalList = effectData?.pauserData?.particalPauser;
            if (particalList != null)
            {
                for (int i = 0; i < particalList.Count; i++)
                {
                    var particalPauser = particalList[i];
                    _paticalList.Remove(particalPauser);
                }
            }
        }



        public void LogicUpdate(float dt)
        {
            if (AreaManager.instance.isInSelecting)
            {
                globalScale = 0.5f;
            }
            else if (SkillManager.instance.needSkillPaused)
            {
                globalScale = 1;
            }
            for (var i = 0; i < _animList.Count; ++i)
            {
                var pauser = _animList[i];
                pauser.LogicUpdate(dt);
            }
            for (var i = 0; i < _paticalList.Count; ++i)
            {
                var pauser = _paticalList[i];
                pauser.LogicUpdate(dt);
            }

            isSpeedChanged = false;
        }

        public void Dispose()
        {
            _UnRegistEvents();
            _instance = null;
        }

    }
}