using System;
using System.Collections.Generic;
using Framework;
using Gameplay.Level;
using Gameplay.Performance;
using Gameplay.Unit;
using Gameplay.Vehicle.Impl;
using PhxhSDK;
using UnityEngine.Rendering;
using Constants = Framework.Constants;

namespace Gameplay.Vehicle.TireMark
{

    using UnityEngine;

    public class TireMarkManager
    {

        private static TireMarkManager _instance;
        public static TireMarkManager instance
        {
            get
            {
                return _instance;
            }
        }

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

        private float _unitSize = 50;
        public Transform rootTrans;
        private List<TireMarkPanel> _panels;
        private List<TireMarkRecorder> _recorders;
        private List<TireMarkDrawData> _drawDatas;
        public List<TireMarkDrawData> drawDatas
        {
            get
            {
                return _drawDatas;
            }
        }

        public Material drawMat;

        private TireMarkManager()
        {
            _panels = new List<TireMarkPanel>();
            _recorders = new List<TireMarkRecorder>();
            _drawDatas = new List<TireMarkDrawData>();
        }

        public void Init()
        {
            if (!PerformanceManager.instance.data.enableTireMark) return;
            // 获取地图大小
            var map = LevelManager.Instance.CurrentLevel.Map;
            var tgsMap = map.TerrainGridSystem;
            var bounds = tgsMap.bounds;
            var xSize = bounds.size.x;
            var zSize = bounds.size.z;

            rootTrans = new GameObject("TireMarkManager").transform;

            // 创建平铺面板
            var masSize = Mathf.Max(xSize, zSize);
            _unitSize = masSize;
            var panelSize = _unitSize;
            var xCount = Mathf.CeilToInt(xSize / panelSize);
            var zCount = Mathf.CeilToInt(zSize / panelSize);
            var startX = bounds.min.x + panelSize / 2;
            var startZ = bounds.min.z + panelSize / 2;
            var sampleObj = AssetManager.Instance.GetPreLoadResult<GameObject>(Constants.TIREMARK_UNIT_PATH);
            for (int i = 0; i < xCount; i++)
            {
                for (int j = 0; j < zCount; j++)
                {
                    var createPos = new Vector3(startX + i * panelSize, 0.1f, startZ + j * panelSize);
                    var instObj = Object.Instantiate(sampleObj, createPos, Quaternion.identity, rootTrans);
                    instObj.name = "TireMarkUnit_" + i + "_" + j;
                    instObj.transform.localScale = new Vector3(panelSize, 1, panelSize);
                    var panel = new TireMarkPanel(instObj);
                    panel.Init();
                    _panels.Add(panel);
                }
            }
            
            // 创建渲染用的材质
            drawMat = AssetManager.Instance.GetPreLoadResult<Material>(Constants.TIREMARK_MAT_PATH);

            _RegistEvents();
        }

        public void Dispose()
        {
            if (!PerformanceManager.instance.data.enableTireMark) return;
            _UnRegistEvents();
            
            // 卸载资源
            for (int i = 0; i < _panels.Count; i++)
            {
                var panel = _panels[i];
                panel.Dispose();
            }
            rootTrans.gameObject.Destroy();
            
            AssetManager.Instance.Unload(Constants.TIREMARK_MAT_PATH);
            AssetManager.Instance.Unload(Constants.TIREMARK_UNIT_PATH);
            
            _panels = null;
            _instance = null;
            _recorders = null;
            _drawDatas = null;
        }

        private void _RegistEvents()
        {
            EventManager.Instance.Register(EventManager.EventName.INFIGHT_UNIT_READY, (Action<GameUnit>)_OnUnitReady);
        }

        private void _UnRegistEvents()
        {
            EventManager.Instance.Unregister(EventManager.EventName.INFIGHT_UNIT_READY, (Action<GameUnit>)_OnUnitReady);
        }

        private void _OnUnitReady(GameUnit unit)
        {
            if (!PerformanceManager.instance.data.enableTireMark) return;
            if (unit is NormalVehicle vehicle)
            {
                RegistVehicle(vehicle);
            }
        }

        public async void RegistVehicle(NormalVehicle vehicle)
        {
            if (!PerformanceManager.instance.data.enableTireMark) return;
            var vehicleObj = vehicle.Node.GameObject.transform;
            // var tailpoints = vehicleObj.Find("tailpoints");
            var tireMarkId = vehicle.configData.tireMarkId;
            if (tireMarkId == 0) return;
            var tireMarkConfig = TableManager.Instance.Tables.TireMarkConfig.DataMap[tireMarkId];
            var texturePath = tireMarkConfig.TexturePath;
            var texture = await AssetManager.Instance.LoadAssetAsync<Texture2D>(texturePath);
            if (texture == null)
            {
                DebugUtil.LogError("加载tireMark贴图失败: {0}", texturePath);
                return;
            }
            var recorder = new TireMarkRecorder(vehicleObj);
            recorder.texture2D = texture;
            recorder.rawConfig = tireMarkConfig;
            RegistRecorder(recorder);
        }

        public void RegistRecorder(TireMarkRecorder recorder)
        {
            if (!PerformanceManager.instance.data.enableTireMark) return;
            recorder.Init();
            _recorders.Add(recorder);
        }

        public void LogicUpdate(float dt)
        {
            if (!PerformanceManager.instance.data.enableTireMark) return;
            for (int i = 0; i < _recorders.Count; i++)
            {
                var recorder = _recorders[i];
                recorder.LogicUpdate(dt);
                if (recorder.canDraw)
                {
                    _drawDatas.Add(recorder.drawData);
                }
            }

        }

        private void _DrawDrawData(TireMarkDrawData drawData,
            CommandBuffer cmd)
        {
            if (!PerformanceManager.instance.data.enableTireMark) return;
            drawData.needCalc = true;
            for (int i = 0; i < _panels.Count; i++)
            {
                var panel = _panels[i];
                panel.Draw(drawData, cmd, i);
            }
        }

        public void DrawDatas(CommandBuffer cmd)
        {
            if (!PerformanceManager.instance.data.enableTireMark) return;
            for (int i = 0; i < _drawDatas.Count; i++)
            {
                _DrawDrawData(_drawDatas[i], cmd);
            }
            _drawDatas.Clear();
        }

    }
}