using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Reflection;
using System.IO;


namespace Sog
{
    // 动态加载服务器逻辑代码
    public static class ScriptLoader
    {
        public class MyAssemblyLoadContext : System.Runtime.Loader.AssemblyLoadContext
        {
            protected override Assembly Load(AssemblyName assemblyName)
            {
                return Assembly.Load(assemblyName);
            }
        }

        public static IScript LoadServerLogicDll(string strDllFile, string scriptTypeName)
        {
            TraceLog.Debug("ScriptLoader.LoadServerLogicDll file {0} type {1}", strDllFile, scriptTypeName);

            //IAssemblyLoadContext
            try
            {
                MyAssemblyLoadContext context = new MyAssemblyLoadContext();

                FileStream dllStream = new FileStream(strDllFile + ".dll", FileMode.Open, FileAccess.Read);
                FileStream pdbStream = new FileStream(strDllFile + ".pdb", FileMode.Open, FileAccess.Read);

                Assembly asm = context.LoadFromStream(dllStream, pdbStream);

                dllStream.Dispose();
                pdbStream.Dispose();


                //AssemblyName asmName = System.Runtime.Loader.AssemblyLoadContext.GetAssemblyName(strDllFile);

                //Assembly asm = Assembly.Load(asmName);

                if (asm == null)
                {
                    TraceLog.Error("ScriptLoader Load ServerDll {0} failed", strDllFile);
                }
                else
                {
                    TraceLog.Debug("ScriptLoader Load ServerDll success");

                    //用类型的命名空间和类获得类型 

                    object scriptImp = asm.CreateInstance(scriptTypeName);

                    IScript scriptObj = scriptImp as IScript;

                    //是不是没有基础IScript?
                    if (scriptObj == null)
                    {
                        TraceLog.Error("ScriptLoader CreateInstance, class {0} failed", scriptTypeName);
                    }
                    else
                    {
                        TraceLog.Debug("ScriptLoader CreateInstance class {0} success", scriptTypeName);
                    }

                    //if(testReloadFailed)
                    //{
                    //    TraceLog.Error("ScriptLoader LoadServerLogicDll, class {0} failed (testReloadFailed)", scriptTypeName);
                    //    return null;
                    //}

                    return scriptObj;
                }
            }
            catch (Exception ex)
            {
                TraceLog.Exception(ex);
            }


            return null;

        }

        public static IScriptHotfixCheck LoadServerLogicDllHotfixCheck(string strDllFile)
        {
            TraceLog.Debug("ScriptLoader.LoadServerLogicDllHotfixCheck file {0}", strDllFile);

            try
            {
                MyAssemblyLoadContext context = new MyAssemblyLoadContext();

                FileStream dllStream = new FileStream(strDllFile + ".dll", FileMode.Open, FileAccess.Read);
                FileStream pdbStream = new FileStream(strDllFile + ".pdb", FileMode.Open, FileAccess.Read);

                Assembly asm = context.LoadFromStream(dllStream, pdbStream);

                dllStream.Dispose();
                pdbStream.Dispose();

                if (asm == null)
                {
                    TraceLog.Error("ScriptLoader.LoadServerLogicDllHotfixCheck Load ServerDll {0} failed", strDllFile);
                }
                else
                {
                    TraceLog.Debug("ScriptLoader.LoadServerLogicDllHotfixCheck Load ServerDll success");

                    //用类型的命名空间和类获得类型, 这个写死就可以了，所有服务器dll里的内容是完全一样的
                    string scriptTypeName = "Sog.ServerScriptHotfixCheck";
                    object scriptImp = asm.CreateInstance(scriptTypeName);

                    IScriptHotfixCheck scriptObj = scriptImp as IScriptHotfixCheck;

                    //是不是没有基础IScript?
                    if (scriptObj == null)
                    {
                        TraceLog.Error("ScriptLoader.LoadServerLogicDllHotfixCheck CreateInstance, class {0} failed", scriptTypeName);
                    }
                    else
                    {
                        TraceLog.Debug("ScriptLoader.LoadServerLogicDllHotfixCheck CreateInstance class {0} success", scriptTypeName);
                    }

                    return scriptObj;
                }
            }
            catch (Exception ex)
            {
                TraceLog.Exception(ex);
            }


            return null;

        }

    }
}