using Microsoft.Xrm.Sdk;

using Microsoft.Xrm.Sdk.Query;

using System;

using System.ServiceModel;

namespace Plugins

{

    public class PreLuoYontDemoEntityCreate : IPlugin

    {

        public void Execute(IServiceProvider serviceProvider)

        {

            ITracingService tracingService = (ITracingService)serviceProvider.GetService(typeof(ITracingService));

            IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));

            if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)

            {

                Entity currentEntity = (Entity)context.InputParameters["Target"];

                IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));

                IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

                try

                {

                    int detailsCount = ;

                    var returnRequestEF = currentEntity.GetAttributeValue<EntityReference>("new_returnrequest");

                    if(returnRequestEF == null)

                    {

                        throw new InvalidPluginExecutionException("Field - Return Request is required!");

                    }

                    string LuoYontDemoEntity_count = string.Format(@"<fetch aggregate='true' mapping='logical' distinct='false'>

  <entity name='new_luoyongdemoentity'>

    <attribute name='new_luoyongdemoentityid' alias='luoyongdemoentityid_count' aggregate='count' />

    <filter type='and'>

      <condition attribute='new_returnrequest' operator='eq' value='{0}' />

      <condition attribute='statecode' operator='eq' value='0' />

    </filter>

  </entity>

</fetch>", returnRequestEF.Id);

                    EntityCollection LuoYontDemoEntity_count_result = service.RetrieveMultiple(new FetchExpression(LuoYontDemoEntity_count));

                    if(if (LuoYontDemoEntity_count_result.Entities.Count >= 1 && LuoYontDemoEntity_count_result.Entities[0].Contains("LuoYontDemoEntity_count") && LuoYontDemoEntity_count_result.Entities[0]["LuoYontDemoEntity_count"] != null && ((AliasedValue)LuoYontDemoEntity_count_result.Entities[0]["LuoYontDemoEntity_count"]).Value != null))

                    {

                        detailsCount = (Int32)((AliasedValue)LuoYontDemoEntity_count_result.Entities[]["luoyongdemoentityid_count"]).Value;

                    }

                    currentEntity["new_name"] = service.Retrieve(returnRequestEF.LogicalName, returnRequestEF.Id, new ColumnSet("new_name")).GetAttributeValue<string>("new_name") + "-" + (detailsCount + ).ToString("");

                }

                catch (FaultException<OrganizationServiceFault> ex)

                {

                    throw new InvalidPluginExecutionException("An error occurred in PreLuoYontDemoEntityCreate.", ex);

                }

                catch (Exception ex)

                {

                    tracingService.Trace("PreLuoYontDemoEntityCreate unexpected exception: {0}", ex.Message);

                    throw;

                }

            }

        }

    }

}