using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using BITKit;
using BITKit.Entities;
using BITKit.WorldNode;
using Cysharp.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Net.Project.B.World;
using Project.B.Map;
using Unity.Mathematics;
using UnityEngine;
using UnityEngine.AI;
using UnityEngine.SceneManagement;
using Object = UnityEngine.Object;

namespace Net.Project.B.WorldNode
{
    public class UnityMinimapService:IWorldMinimapService
    {
        public string Directory { get; } = Path.Combine(Application.persistentDataPath, "Overviews").Replace('/', '\\');
        
        private readonly IGameMapService _gameMapService;
        private readonly ILogger<UnityMinimapService> _logger;
        private readonly IEntitiesService _entitiesService;

        private UniTaskCompletionSource _waitMinimap=new();
        
        public object MinimapObject { get; private set; }
        public float2 Offset { get;private set; }
        public int Size { get; private set;}
        public event Action OnMinimapInitialized;
        
        public UnityMinimapService(ILogger<UnityMinimapService> logger, IEntitiesService entitiesService, IGameMapService gameMapService)
        {
            _logger = logger;
            _entitiesService = entitiesService;
            _gameMapService = gameMapService;
            _entitiesService.OnAdd += OnNodeRegistered;

            _gameMapService.OnMapChanged += OnMapChanged;
        }

        private async void OnMapChanged(Guid arg1, string arg2)
        {
            if(string.IsNullOrEmpty(arg2))return;

            _waitMinimap?.TrySetCanceled();

            _waitMinimap = new();

            try
            {
                await _waitMinimap.Task.Timeout(TimeSpan.FromSeconds(1));
                
                return;
            }
            catch(OperationCanceledException){}
            catch (TimeoutException)
            {
                _logger.LogInformation("未找到预设Minimap,开始自动创建");
            }

            foreach (var scriptableGameMapData in _entitiesService.QueryComponents<ScriptableGameMapData>().ToArray())
            {
                if(scriptableGameMapData.MapAddress != arg2)continue;
                if(scriptableGameMapData.MapOverview is not Object{ }obj)continue;
                if(!obj)continue;
                
                MinimapObject = scriptableGameMapData.MapOverview;
                
                Offset = scriptableGameMapData.Offset;
                Size = scriptableGameMapData.Size;
                    
    
                    OnMinimapInitialized?.Invoke();
                    
                    _logger.LogInformation($"从{nameof(ScriptableGameMapData)}中找到了Minimap");
                    
                    return;
            }

            var worldBounds = new Bounds(default,Vector3.one*32);

            foreach (var rootGameObject in SceneManager.GetActiveScene().GetRootGameObjects())
            {
                foreach (var collider in rootGameObject.GetComponentsInChildren<Collider>())
                {
                    var bounds = collider.bounds;
                    
                    if(bounds.size.GetLength()>32 || collider.gameObject.isStatic)continue;
                    
                     worldBounds.Encapsulate(bounds);
                }
            }
            
            var size = worldBounds.size;
            
            var camera = new GameObject().AddComponent<Camera>();

            //camera.cullingMask = LayerMask.NameToLayer("Default");
            camera.orthographicSize = math.max(size.x,size.z);

            camera.transform.position = worldBounds.center + Vector3.up * camera.orthographicSize;
            camera.transform.localEulerAngles = new(90, 0, 0);

            camera.orthographic = true;
        
            var rendererTexture = new RenderTexture(  (int)camera.orthographicSize*8,  (int)camera.orthographicSize*8, 32);

            camera.targetTexture = rendererTexture;
            
            camera.Render();

            var cameraPosition = camera.transform.position;
            
            Offset = new(cameraPosition.x, cameraPosition.z);

            Size = (int)camera.orthographicSize;

            camera.targetTexture = null;
            
            SaveRendererTextureToPng(_gameMapService.CurrentMap,rendererTexture);
            
            Object.Destroy(camera.gameObject);

            MinimapObject = rendererTexture;
            
            OnMinimapInitialized?.Invoke();
        }

        private async void OnNodeRegistered(IEntity entity)
        {
            try
            {
                if(entity.ServiceProvider.GetService<UnityMinimapNode>() is not {}minimapNode)return;


                if (entity.ServiceProvider.GetService<Camera>() is not { } camera)
                {
                    if (entity.ServiceProvider.GetService<Transform>() is {} transform && transform.TryGetComponent<Camera>(out camera) )
                    {
                    
                    }
                    else
                    {
                        _logger.LogWarning("未找到Camera,跳过");
                        return;
                    }
                }
        

                await UniTask.NextFrame();

                if (!camera)
                {
                    _logger.LogWarning("Camera 已被销毁,跳过");
                    return;
                }

                GameObject sample = null;
                
                if(false)
                {

                    NavMeshTriangulation navMeshTriangluation = NavMesh.CalculateTriangulation();
                    int[] triangles = navMeshTriangluation.indices;
                    Vector3[] vertices = navMeshTriangluation.vertices;

                    var mesh = new Mesh();
                    mesh.vertices = vertices;
                    mesh.triangles = triangles;
                    mesh.RecalculateNormals();
                    mesh.RecalculateBounds();
                    mesh.Optimize();


                    sample = new GameObject();
                    sample.transform.position = default;
                    sample.transform.rotation = default;
                    sample.AddComponent<MeshFilter>().mesh = mesh;
                    sample.AddComponent<MeshRenderer>().material = new Material(Shader.Find("Unlit/Color"))
                    {
                        color = new Color32(64, 64, 64, 255),
                        renderQueue = 4000
                    };

                }

                camera.Render();


                SaveRendererTextureToPng(_gameMapService.CurrentMap,camera.targetTexture);
                
                await UniTask.NextFrame();
                
                if(sample)
                Object.Destroy(sample);
            
                MinimapObject = camera.targetTexture;

                camera.targetTexture = null;
            
                Object.Destroy(camera.gameObject);
                
        
            
                _logger.LogInformation("已获取到Minimap");

                var cameraPosition = camera.transform.position;

                Offset = new(cameraPosition.x, cameraPosition.z);

                Size = (int)camera.orthographicSize;
            
                OnMinimapInitialized?.Invoke();

                _waitMinimap.TrySetResult();
            }
            catch (Exception e)
            {
                _logger.LogError(e,e.Message);
            }
        
        }

        private void SaveRendererTextureToPng(string name,RenderTexture rendererTexture)
        {
            var screenshot = new Texture2D(rendererTexture.width, rendererTexture.height, TextureFormat.RGBA32, false);
            RenderTexture.active = rendererTexture;
            screenshot.ReadPixels(new Rect(0, 0, rendererTexture.width, rendererTexture.height), 0, 0);
            screenshot.Apply();
            RenderTexture.active = null;
            
            
            var bytes = screenshot.EncodeToPNG();

            var fileName = DateTime.Now.Ticks;

            var path = Path.Combine(Directory,$"{name}_{fileName}.png");

            new DirectoryInfo(Directory).Create();

            File.WriteAllBytes(path, bytes);
        }
   
        
    }
}