using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Cysharp.Threading.Tasks;
#if !UNITY_WEBGL
using HybridCLR;
#endif
using UnityEngine;
using YooAsset;

namespace Stary.Evo
{
    public class HotFixDllState : AbstractFSMIStateAsync
    {
        public string[] PatchedAOTAssemblyList =
        {
            "System.Core.dll",
            "UnityEngine.CoreModule.dll",
            "mscorlib.dll",
            "DOTween.dll",
            "UniTask.dll",
            "YooAsset.dll",
            "com.stary.evo.runtime.dll",
            "com.staryevo.tools.runtime.dll",
            "mscorlib.dll"
        };

        public HotFixDllState(IFsmSystemAsync system) : base(system)
        {
        }

        public override async UniTask OnEnterAsync<T>(T param)
        {
            var domainConfig = param as DomainConfig;
            Debug.Log("UnityEvo:热更脚本...");
            var package = YooAssets.GetPackage(AppConfig.PackageDomainName);
            // Editor环境下，HotUpdate.dll.bytes已经被自动加载，不需要加载，重复加载反而会出问题。


            // 添加类型存在性检查
            var fullClassName = $"{domainConfig.@namespace}.{domainConfig.className}";

#if EDITOR_SIMULATEMODE
            // Editor下无需加载，直接查找获得HotUpdate程序集
            Assembly hotUpdateAss = System.AppDomain.CurrentDomain.GetAssemblies()
                .First(a => a.GetName().Name == $"HotUpdate_{AppConfig.PackageDomainName}");
#else
            var hotUpdateAssemblyName = $"HotUpdate_{AppConfig.PackageDomainName}";


            var assemblyType = IsAssetLoaded(fullClassName);
            if (assemblyType != null)
            {
                Debug.Log($"UnityEvo:热更程序集:{hotUpdateAssemblyName} 已经加载过了");
                FsmSystem.SetCurState(nameof(ResStartState), domainConfig, assemblyType);
                return;
            }


            //判断DLL是否下载成功
            foreach (var aot in PatchedAOTAssemblyList)
            {
                var aotName = $"Android_{aot}";
                var handle = package.LoadAssetAsync<TextAsset>(aotName);
                await handle;
                if (handle.Status == EOperationStatus.Succeed)
                {
                    var assetObj = handle.AssetObject as TextAsset;
                    _sAssetDatas.Add(assetObj);
                    Debug.Log($"UnityEvo:dll:{aotName}   ,下载成功");
                }
                else
                {
                    Debug.Log($"UnityEvo:dll:{aotName}   ,下载失败");
                }
            }

            //先补元数据
            LoadMetadataForAOTAssemblies();

            // 加载热更dll
            var hotfixDll = package.LoadAssetAsync<TextAsset>($"Android_HotUpdate_{AppConfig.PackageDomainName}.dll");
            await hotfixDll;
            var hotfixPdb = package.LoadAssetAsync<TextAsset>($"Android_HotUpdate_{AppConfig.PackageDomainName}.pdb");
            await hotfixPdb;
            Assembly hotUpdateAss = null;
            if (hotfixDll.Status == EOperationStatus.Succeed)
            {
                Debug.Log("UnityEvo:hotfixDll读取成功！！");
                var hotfixDllAsset = hotfixDll.AssetObject as TextAsset;
                if (hotfixPdb.Status == EOperationStatus.Succeed)
                {
                    Debug.Log("UnityEvo:hotfixPdb:读取成功！！");
                    var hotfixPdbAsset = hotfixPdb.AssetObject as TextAsset;
                    if (hotfixPdbAsset != null)
                    {
                        Debug.Log("UnityEvo:开始加载DLL和PDB...");
                        try
                        {
                            // 分步骤验证字节数组有效性
                            if (hotfixDllAsset.bytes == null || hotfixDllAsset.bytes.Length == 0)
                            {
                                Debug.LogError("UnityEvo:热更DLL字节数组为空！");
                                return;
                            }

                            if (hotfixPdbAsset.bytes == null || hotfixPdbAsset.bytes.Length == 0)
                            {
                                Debug.LogWarning("UnityEvo:PDB字节数组为空，尝试仅加载DLL...");
                                hotUpdateAss = Assembly.Load(hotfixDllAsset.bytes);
                            }
                            else
                            {
                                // 尝试加载DLL和PDB
                                hotUpdateAss = Assembly.Load(hotfixDllAsset.bytes, hotfixPdbAsset.bytes);
                            }

                            Debug.Log(
                                $"UnityEvo:Assembly加载成功，大小:DLL={hotfixDllAsset.bytes.Length} bytes, PDB={hotfixPdbAsset.bytes.Length} bytes");
                        }
                        catch (Exception ex)
                        {
                            Debug.LogError($"UnityEvo:Assembly加载异常: {ex}");
                            // 尝试仅加载DLL作为备选方案
                            try
                            {
                                Debug.Log("UnityEvo:尝试仅加载DLL...");
                                hotUpdateAss = Assembly.Load(hotfixDllAsset.bytes);
                            }
                            catch (Exception ex2)
                            {
                                Debug.LogError($"UnityEvo:仅加载DLL也失败: {ex2}");
                                return;
                            }
                        }
                    }
                    else
                    {
                        Debug.LogError("UnityEvo:hotfixPdb: AssetObject为空！！");
                    }
                }
                else
                {
                    if (hotfixDllAsset != null)
                        try
                        {
                            Debug.Log("UnityEvo:开始加载DLL...");
                            // 分步骤验证字节数组有效性
                            if (hotfixDllAsset.bytes == null || hotfixDllAsset.bytes.Length == 0)
                            {
                                Debug.LogError("UnityEvo:热更DLL字节数组为空！");
                                return;
                            }

                            hotUpdateAss = Assembly.Load(hotfixDllAsset.bytes);
                            Debug.Log(
                                $"UnityEvo:Assembly加载成功，大小:DLL={hotfixDllAsset.bytes.Length} bytes");
                        }
                        catch (Exception e)
                        {
                            Debug.LogError($"UnityEvo:Assembly加载异常: {e}");
                        }

                    else
                        Debug.LogError("UnityEvo:hotfixDll: AssetObject为空！！");
                }
            }
            else
            {
                Debug.LogError($"UnityEvo:Android_HotUpdate_{AppConfig.PackageDomainName}.dll加载失败！！！！！");
            }


#endif
            Debug.Log($"UnityEvo:dll: Assembly.Load加载后是否为空:{hotUpdateAss == null}");
            if (hotUpdateAss != null)
            {
                var type = hotUpdateAss.GetType(fullClassName);

                if (type == null)
                {
                    Debug.LogError($"UnityEvo:热更类不存在！程序集: {hotUpdateAss.FullName}\n" +
                                   $"期望类名: {fullClassName}\n" +
                                   $"可用类型列表：{string.Join("\n", hotUpdateAss.GetTypes().Select(t => t.FullName))}");
                    return;
                }

                // 添加方法存在性检查
                Debug.Log("UnityEvo:dll:开始MethodInfo检查！！");
                var onEnterMethod = type.GetMethod("OnEnter");
                var onEnterAsyncMethod = type.GetMethod("OnEnterAsync");
                if (onEnterMethod == null || onEnterAsyncMethod == null)
                {
                    Debug.LogError("UnityEvo:热更类进入方法缺失！\n" +
                                   $"存在方法：{string.Join(", ", type.GetMethods().Select(m => m.Name))}");
                    return;
                }

                Debug.Log("UnityEvo:dll:OnEnter检查成功！！");
                var onExitMethod = type.GetMethod("OnExit");
                var onExitAsyncMethod = type.GetMethod("OnExitAsync");
                if (onExitMethod == null || onExitAsyncMethod == null)
                {
                    Debug.LogError("UnityEvo:热更类退出方法缺失！\n" +
                                   $"存在方法：{string.Join(", ", type.GetMethods().Select(m => m.Name))}");
                    return;
                }

                Debug.Log("UnityEvo:dll:OnExit检查成功！！");
                // AppConfig.SetDefaultHotfixType(type);
                FsmSystem.SetCurState(nameof(ResStartState), domainConfig, type);
                // // 创建热更类实例
                // DomainBase hotfixInstance = AppConfig.HOTFIXBASE.AddComponent(type) as DomainBase;
                //
                // if (hotfixInstance == null)
                // {
                //     Debug.LogError($"热更类{fullClassName}实例创建失败！必须继承MonoBehaviour");
                //     return;
                // }
                //
                //
                // // 原有调用逻辑修改为使用实例
                // onEnterMethod.Invoke(hotfixInstance, new object[] { "" }); // 第一个参数改为实例对象
                // onEnterAsyncMethod.Invoke(hotfixInstance, new object[] { "" });
            }
            else
            {
                Debug.LogError("UnityEvo:热更类不存在！程序集: hotUpdateAss 不存在\n" +
                               $"期望类名: {fullClassName}\n" +
                               $"可用类型列表：{string.Join("\n", hotUpdateAss.GetTypes().Select(t => t.FullName))}");
            }
        }

        private Type IsAssetLoaded(string assemblyName)
        {
            var assemblies = AppDomain.CurrentDomain.GetAssemblies();
            foreach (var assembly in assemblies)
            {
                var assemblyType = assembly.GetType(assemblyName);
                if (assemblyType != null)
                {
                    Debug.Log("type:" + assemblyType);
                    return assemblyType;
                }
            }

            return null;
        }

        #region 补充元数据

        private readonly List<TextAsset> _sAssetDatas = new();

        

        /// <summary>
        ///     为aot assembly加载原始metadata， 这个代码放aot或者热更新都行。
        ///     一旦加载后，如果AOT泛型函数对应native实现不存在，则自动替换为解释模式执行
        /// </summary>
        private void LoadMetadataForAOTAssemblies()
        {
#if !UNITY_WEBGL
            var mode = HomologousImageMode.SuperSet;
            // foreach (var aotDllName in AOTGenericReferences.PatchedAOTAssemblyList)
            foreach (var aotDll in _sAssetDatas)
                // var aotName = $"Android_{aotDllName}";
                //
                // byte[] dllBytes = ReadBytesFromStreamingAssets(aotName);
                if (aotDll != null)
                {
                    var dllBytes = aotDll.bytes;
                    // 添加元数据加载校验
                    if (dllBytes == null || dllBytes.Length == 0)
                    {
                        Debug.LogError($"AOT元数据加载失败：{aotDll.name}");
                        continue;
                    }

                    var err = RuntimeApi.LoadMetadataForAOTAssembly(dllBytes, mode);

                    Debug.Log($"UnityEvo:【补元】{aotDll.name} 加载结果: {err} 字节数: {dllBytes.Length}");
                }
#endif
        }

        #endregion
    }
}