using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using BITKit.Entities;
using BITKit.WorldNode;
using Cysharp.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Unity.Mathematics;
using UnityEngine;
using YamlDotNet.Serialization;
using Object = UnityEngine.Object;

namespace Net.Project.B.World
{
    public class UnitySnapshotService : ISnapshotService
    {
        private readonly IEntitiesService _entitiesService;

        private readonly ILogger<UnitySnapshotService> _logger;

        private readonly ISerializer _serializer;
        private readonly IDeserializer _deserializer;

        public UnitySnapshotService(ISerializer serializer, IDeserializer deserializer, ILogger<UnitySnapshotService> logger, IEntitiesService entitiesService)
        {
            _serializer = serializer;
            _deserializer = deserializer;
            _logger = logger;
            _entitiesService = entitiesService;
        }

        public string Directory { get; } = Path.Combine(Application.persistentDataPath, "Snapshots").Replace('/', '\\');

        public async UniTask<SnapshotData> Snapshot(float3 position, quaternion rotation, int fov)
        {
            var renderTexture = new RenderTexture(Screen.width, Screen.height, 32);

            var camera = Camera.main;

            if (!camera) throw new DriveNotFoundException("未找到MainCamera");

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

            camera.targetTexture = null;

            var screenshot = new Texture2D(renderTexture.width, renderTexture.height, TextureFormat.RGBA32, false);
            RenderTexture.active = renderTexture;
            screenshot.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
            screenshot.Apply();
            RenderTexture.active = null;

            Object.Destroy(renderTexture);

            var bytes = screenshot.EncodeToPNG();

            var fileName = DateTime.Now.Ticks;

            var path = Path.Combine(Directory, fileName + ".png");

            new DirectoryInfo(Directory).Create();

            await File.WriteAllBytesAsync(path, bytes);

            var data = new SnapshotData
            {
                FileName = null,
                Name = null,
                Description = null,
                CreateTime = default,
                Position = default,
                Rotation = default
            };

            data.FileName = path;
            data.Name = "无标题";
            data.Description = "无描述";
            data.CreateTime = DateTime.Now;
            data.Position = camera.transform.position;
            data.Rotation = camera.transform.rotation;


            if (Physics.Raycast(camera.transform.position, camera.transform.forward, out var hit))
            {
                if(_entitiesService.Entities.TryGetValue(hit.transform.gameObject.GetInstanceID(),out var hitEntity) && hitEntity.ServiceProvider.GetService<WorldInfoNode>() is {} node)
                {
                    data.Name = node.Name;
                    data.Description = node.Description;

                    _logger.LogInformation($"相机命中了:{hit.transform.name}@{node.Name}:{node.Description}");
                }
                else
                {
                    _logger.LogInformation($"相机命中了:{hit.transform.name},但无有效目标");
                }
            }

            var yaml = _serializer.Serialize(data);

            await File.WriteAllTextAsync(Path.Combine(Directory, fileName + ".yaml"), yaml);

            await UniTask.SwitchToMainThread();

            OnSnapshot?.Invoke(data);

            return data;
        }

        public async UniTask<IReadOnlyList<SnapshotData>> GetSnapshots()
        {
            var list = new List<SnapshotData>();

            new DirectoryInfo(Directory).Create();
            foreach (var fileInfo in new DirectoryInfo(Directory).GetFiles("*.yaml"))
            {
                var yaml = await File.ReadAllTextAsync(fileInfo.FullName);
                var data = _deserializer.Deserialize<SnapshotData>(yaml);

                list.Add(data);
            }

            return list;
        }

        public static event Action<SnapshotData> OnSnapshot;

        event Action<SnapshotData> ISnapshotService.OnSnapshot
        {
            add => OnSnapshot += value;
            remove => OnSnapshot -= value;
        }
    }
}