using System;
using System.Collections.Generic;
using Cysharp.Threading.Tasks;
using Framework;
using Gameplay.Buff;
using Gameplay.Common;
using Gameplay.Skill;
using Gameplay.Vehicle.Data;
using Gameplay.Vehicle.Impl;
namespace Gameplay.Vehicle
{
    public class VehicleManager
    {

        private static VehicleManager _instance;

        public static VehicleManager Inst
        {
            get
            {
                return _instance;
            }
        }

        public static VehicleManager CreateInstance()
        {
            if (_instance != null)
            {
                DebugUtil.LogError("请勿重复创建VehicleManager");
                return _instance;
            }
            _instance = new VehicleManager();
            return _instance;
        }

        private readonly List<PreviewVehicle> _preCreateVehicles = new List<PreviewVehicle>();
        private readonly List<NormalVehicle> _vehicles = new List<NormalVehicle>();
        
        private bool _needRefreshTargets = false;

        private VehicleManager()
        {

        }

        public async UniTask InitForBattle()
        {
            // 把所有的预创建的vehicle都创建出来
            for (int i = 0; i < _preCreateVehicles.Count; i++)
            {
                var pVehicle = _preCreateVehicles[i];
                GameUnitMapper.Inst.RemoveUnitById(pVehicle.GetID());
                var vehicle = new NormalVehicle(pVehicle);
                await vehicle.ReInit();
                _AddVehicle(vehicle);
            }
            _preCreateVehicles.Clear();

            _needRefreshTargets = true;
            
            _RegistEvents();
        }
        
        private void _AddVehicle(NormalVehicle vehicle)
        {
            _vehicles.Add(vehicle);
            
            BuffManager.instance.InitVehicle(vehicle);
        }

        private void _RegistEvents()
        {
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_UNIT_CELLINDEX_CHANGE, (Action<GameUnit>)_OnAnyCharacterCellIndexChange);
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_UP_VEHICLE, (Action<GameUnit>)_OnAnyCharacterCellIndexChange);
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_DOWN_VEHICLE, (Action<GameUnit>)_OnAnyCharacterCellIndexChange);
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_UNIT_DEAD, (Action<GameUnit>)_OnCharacterDead);
        }

        private void _UnRegistEvents()
        {
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_UNIT_CELLINDEX_CHANGE, (Action<GameUnit>)_OnAnyCharacterCellIndexChange);
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_UP_VEHICLE, (Action<GameUnit>)_OnAnyCharacterCellIndexChange);
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_DOWN_VEHICLE, (Action<GameUnit>)_OnAnyCharacterCellIndexChange);
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_UNIT_DEAD, (Action<GameUnit>)_OnCharacterDead);
        }
        
        private void _OnCharacterDead(GameUnit deadCharacter)
        {
            _needRefreshTargets = true;
        }

        private void _OnAnyCharacterCellIndexChange(GameUnit noUse)
        {
            _needRefreshTargets = true;
        }

        private void _UpdateTargets()
        {
            for (int i = 0; i < _vehicles.Count; i++)
            {
                var vehicle = _vehicles[i];
                vehicle.UpdateTargets();
            }
        }

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

        public void PreviewUpdate(float dt)
        {
            for (int i = 0; i < _preCreateVehicles.Count; i++)
            {
                var vehicle = _preCreateVehicles[i];
                vehicle.PreviewUpdate(dt);
            }
        }

        public void LogicUpdate(float dt)
        {
            if (SkillManager.instance.needSkillPaused)
            {
                return;
            }
            if (_needRefreshTargets)
            {
                _needRefreshTargets = true;
                _UpdateTargets();
            }
            for (int i = 0; i < _vehicles.Count; i++)
            {
                var vehicle = _vehicles[i];
                vehicle.LogicUpdate(dt);
            }
        }

        /// <summary>
        /// 非战斗状态下创建vehicle
        /// </summary>
        /// <param name="uid"></param>
        /// <param name="vehicleId"></param>
        /// <param name="skillLevel"></param>
        /// <param name="troopId"></param>
        /// <returns></returns>
        public PreviewVehicle CreateVehicleForPreview(uint uid, int vehicleId,
            int skillLevel,
            int troopId)
        {
            var uuId = uid;
            var configData = _CreateConfigData(vehicleId, 1, skillLevel);
            var vehicle = new PreviewVehicle(uuId, configData, troopId);
            _ = vehicle.Create();

            _preCreateVehicles.Add(vehicle);
            
            return vehicle;
        }
        
        public async UniTask<BaseVehicle> CreateVehicle(uint uid, int vehicleId,
            int skillLevel,
            int troopId)
        {
            var uuId = uid;
            var configData = _CreateConfigData(vehicleId, 1, skillLevel);
            var vehicle = new NormalVehicle(uuId, configData, troopId);
            await vehicle.CreateAndReady();
            
            _AddVehicle(vehicle);
            return vehicle;
        }
        
        public void RemoveVehicleForPreview(PreviewVehicle vehicle)
        {
            
            EventManager.Instance.Send(EventManager.EventName.INFIGHT_UNIT_DEAD, vehicle);
            EventManager.Instance.Send(EventManager.EventName.INFIGHT_UNIT_REMOVE, vehicle);
            
            vehicle.Dispose();
            _preCreateVehicles.Remove(vehicle);
            
        }

        private static VehicleConfigData _CreateConfigData(int vehicleId, int level, int skillLevel)
        {
            var rawConfig = TableManager.Instance.Tables.VehicleConfig.Get(vehicleId);
            if (rawConfig == null)
            {
                DebugUtil.LogError("找不到vehicleId对应的配置: {0}", vehicleId);
                return null;
            }
            var configData = new VehicleConfigData();
            configData.Init(rawConfig, level, skillLevel);
            return configData;
        }

    }
}