using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.Emit;
using Microsoft.CSharp;
using System;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Runtime;
using System.Runtime.CompilerServices;

namespace BPASmartClient.Compiler
{
    /// <summary>
    /// C#编译器
    /// </summary>
    public class CSharpConfig
    {
        #region 单例模式
        public static CSharpConfig Instance = null;

        public static CSharpConfig GetInstance()
        {
            if (Instance == null)
            {
                Instance = new CSharpConfig();
            }
            return Instance;
        }
        #endregion

        public CSharpConfig()
        {


        }



        public object RunCSharp(string code,object[] objValue,string error = "")
        {
            object strretu = string.Empty;
            try
            {
                string funName = "main";
                StringBuilder builder = new StringBuilder();
                //builder.Append("using System;\n");
                //builder.Append("using System.Linq;\n");
                builder.Append("using Newtonsoft.Json;\n");
                builder.Append("using Newtonsoft.Json.Linq;\n");
                //builder.Append("using System.IO;\n");
                //builder.Append("using System.Runtime;\n");
                //builder.Append("using System.Text;\n");
                builder.Append("using System.Collections.Generic;\n");
                builder.Append("namespace YF \n{\n  class CSharpConfigRun\n");
                builder.Append("  {\n");
                builder.Append(code);
                builder.Append("  }\n}\n");
                //1.添加要引用的程序集
                string output = Path.GetTempFileName();
                string assemblyName = Path.GetFileName(output);
                var refPaths = new[] {
                        Assembly.GetExecutingAssembly().Location,
                        typeof(object).GetTypeInfo().Assembly.Location,
                        Path.Combine(Path.GetDirectoryName(typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly.Location), "System.dll"),
                        Path.Combine(Path.GetDirectoryName(typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly.Location), "System.Collections.dll"),
                        Path.Combine(Path.GetDirectoryName(typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly.Location), "System.Threading.dll"),
                        Path.Combine(Path.GetDirectoryName(typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly.Location), "System.Runtime.dll"),
                        Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "Newtonsoft.Json.dll"),
                        typeof(DynamicAttribute).GetTypeInfo().Assembly.Location,
                };
                MetadataReference[] references = refPaths.Select(r => MetadataReference.CreateFromFile(r)).ToArray();

                List<MetadataReference> refs = new List<MetadataReference>() {
                MetadataReference.CreateFromFile (typeof (object).Assembly.Location),
                MetadataReference.CreateFromFile (typeof (List<int>).Assembly.Location),
                MetadataReference.CreateFromFile (typeof (ASCIIEncoding).Assembly.Location),
                MetadataReference.CreateFromFile (typeof (JsonConvert).Assembly.Location),
                MetadataReference.CreateFromFile (typeof (JObject).Assembly.Location),
                MetadataReference.CreateFromFile (typeof (Object).Assembly.Location),
                MetadataReference.CreateFromFile (typeof (JContainer).Assembly.Location),
                MetadataReference.CreateFromFile (typeof (JToken).Assembly.Location),
                MetadataReference.CreateFromFile (typeof (Enumerable).Assembly.Location),
               };
                //2.需要编辑的C#代码
                SyntaxTree tree = CSharpSyntaxTree.ParseText(builder.ToString());
                //3.生成C#编译
                var compilation = CSharpCompilation.Create(Guid.NewGuid().ToString() + ".dll")
                    .WithOptions(new CSharpCompilationOptions(
                        Microsoft.CodeAnalysis.OutputKind.DynamicallyLinkedLibrary
                        ,
                        usings: null,
                        optimizationLevel: OptimizationLevel.Debug, // TODO
                        checkOverflow: false, // TODO
                        allowUnsafe: true, // TODO
                        platform: Platform.AnyCpu,
                        warningLevel: 4,
                        xmlReferenceResolver: null
                        ))
                    .AddReferences(references)
                    .AddSyntaxTrees(tree);

                //var emitResult = compilation.Emit(output);
                EmitResult emitResult;
                byte[] dllBytes;
                using (var stream = new MemoryStream())
                {
                    emitResult = compilation.Emit(stream);
                    dllBytes = stream.ToArray();
                }

                if (emitResult.Success)
                {
                    Assembly assembly = Assembly.Load(dllBytes);
                    var obj = assembly.CreateInstance("YF.CSharpConfigRun");
                    var method = obj.GetType().GetMethod("main",new Type[] { typeof(string) });
                    strretu = method.Invoke(obj,objValue);
                }


                //var providerOptions = new Dictionary<string,string>();
                //providerOptions.Add("CompilerVersion","v4.0");
                //CSharpCodeProvider compiler = new CSharpCodeProvider(providerOptions);
                //string output = Path.GetTempFileName();
                //var cp = new CompilerParameters() { GenerateInMemory = true,OutputAssembly = output };
                //cp.ReferencedAssemblies.Add(Assembly.GetExecutingAssembly().Location);
                //cp.ReferencedAssemblies.Add("Microsoft.CSharp.dll");
                //cp.ReferencedAssemblies.Add("System.Core.dll");
                //cp.ReferencedAssemblies.Add("Newtonsoft.Json.dll"); //添加引用
                //cp.ReferencedAssemblies.Add("System.dll");
                //cp.GenerateExecutable = false;
                //cp.EmbeddedResources.Clear();
                //cp.LinkedResources.Clear();
                //cp.Win32Resource = null;
                //cp.TreatWarningsAsErrors = false;
                //cp.WarningLevel = 4;
                //cp.TempFiles.KeepFiles = false;
                //CompilerResults cr = compiler.CompileAssemblyFromSource(cp,builder.ToString());




                // 1.ICodeComplier
                // CSharpCodeProvider complier = new CSharpCodeProvider();
                // // 2.CompilerParameters
                // CompilerParameters cp = new CompilerParameters();
                // cp.ReferencedAssemblies.Add("System.dll"); //添加引用
                //// cp.ReferencedAssemblies.Add("Newtonsoft.Json.dll"); //添加引用
                // cp.GenerateExecutable = false;
                // cp.GenerateInMemory = true;
                // // 3.CompilerResults
                // CompilerResults cr = complier.CompileAssemblyFromSource(cp,builder.ToString());
                //if (cr.Errors.HasErrors)
                //{
                //    foreach (CompilerError err in cr.Errors)
                //    {
                //        error += err.ErrorText + "\r\n";
                //    }
                //}
                //else
                //{
                //    // 通过反射，调用HelloWorld的实例
                //    Assembly objAssembly = cr.CompiledAssembly;
                //    object objClass = objAssembly.CreateInstance("CSharpConfigRun");
                //    MethodInfo objFun = objClass.GetType().GetMethod(funName);
                //    strretu = objFun.Invoke(objClass,objValue);
                //}
            }
            catch (Exception ex)
            {
                error += ex.Message;
            }
            return strretu;
        }
    }
}