/////////////////////////////////////////////////////////////////
// 
// (C) Copyright 2013, Kenneth, Inc.
// All rights reserved. Confidential. Except as pursuant
// to a written agreement with Kenneth, this software may
// not be used or distributed. This software may be covered
// by one or more patents.
//
// 本软件为Kenneth开发，版权所有，违者必究，320325198102218110
//
/////////////////////////////////////////////////////////////////

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using Newtonsoft.Json;

namespace GummingCommon
{
    /// <summary>
    /// 后台服务调度引擎
    /// </summary>
    public sealed class ServiceEngine
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="errorCode"></param>
        /// <returns></returns>
        public static string DealErrorInfo(string errorCode)
        {
            OutEntity oe = new OutEntity() { ErrorCode = errorCode };
            return JsonConvert.SerializeObject(oe);
        }

        private static object InvokeMethodBase(string assemblyName, string classType, string methodName, string currentUserId, string currentClientId, object currentSendParameter, Type paratype)
        {
            object outEntity = null;
            //加载 Assembly
            Assembly assembly = null;
            if (assemblyName != "")
            {
                try
                {
                    assembly = Assembly.Load(assemblyName);
                }
                catch (Exception ep)
                {
                    throw new Exception(ErrorCode.LoadAssemblyError, ep);
                }
            }
            else
            {
                return DealErrorInfo(ErrorCode.LoadAssemblyConfigError);
            }

            if (assembly == null)
            {
                return DealErrorInfo(ErrorCode.LoadAssemblyConfigError);
            }


            //加载类型
            Type type = null;
            if (classType != "")
            {
                try
                {
                    type = assembly.GetType(classType);
                }
                catch (Exception ep)
                {
                    throw new Exception(ErrorCode.GetAssemblyTypeError, ep);
                }
            }
            else
            {
                return DealErrorInfo(ErrorCode.GetAssemblyTypeConfigError);
            }

            if (type == null)
            {
                return DealErrorInfo(ErrorCode.GetAssemblyTypeConfigError);
            }

            //加载类型
            MethodInfo methodInfo = null;
            if (methodName != "")
            {
                try
                {
                    Type[] typeArray = new Type[3];
                    typeArray.SetValue(typeof(string), 0);
                    typeArray.SetValue(typeof(string), 1);
                    typeArray.SetValue(paratype, 2);
                    methodInfo = type.GetMethod(methodName, typeArray);
                }
                catch (Exception ep)
                {
                    throw new Exception(ErrorCode.GetAssemblyMethodError, ep);
                }
            }
            else
            {
                return DealErrorInfo(ErrorCode.GetAssemblyMethodConfigError);
            }

            if (methodInfo == null)
            {
                return DealErrorInfo(ErrorCode.GetAssemblyMethodConfigError);
            }

            //产生实例
            Object objectInstance = null;
            if (classType != "")
            {
                try
                {
                    objectInstance = assembly.CreateInstance(classType);
                }
                catch (Exception ep)
                {
                    throw new Exception(ErrorCode.CreateInstanceError, ep);
                }
            }
            else
            {
                return DealErrorInfo(ErrorCode.CreateInstanceConfigError);
            }

            if (objectInstance == null)
            {
                return DealErrorInfo(ErrorCode.CreateInstanceConfigError);
            }

            //调用方法
            try
            {
                object[] objectParameters = new object[] { currentUserId, currentClientId, currentSendParameter };

                outEntity = methodInfo.Invoke(objectInstance, objectParameters);
            }
            catch (Exception ep)
            {
                throw new Exception(ErrorCode.InvokeMethodError, ep.InnerException);
            }

            return outEntity;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="inEntity"></param>
        /// <returns></returns>
        public static string InvokeMethod(string assemblyName, string classType, string methodName, string currentUserId, string currentClientId, string currentSendParameter)
        {
            return (string)InvokeMethodBase(assemblyName, classType, methodName, currentUserId, currentClientId, currentSendParameter, typeof(string));
        }

        public static string WriteFile(string assemblyName, string classType, string methodName, string currentUserId, string currentClientId, TestphotofilesEntity file)
        {
            return (string)InvokeMethodBase(assemblyName, classType, methodName, currentUserId, currentClientId, file, typeof(TestphotofilesEntity));
        }

        public static byte[] ReadFile(string assemblyName, string classType, string methodName, string currentUserId, string currentClientId, string recid)
        {
            return (byte[])InvokeMethodBase(assemblyName, classType, methodName, currentUserId, currentClientId, recid, typeof(string));
        }
    }
}