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// -*- C++ -*-
//
// Package:     ServiceRegistry
// Class  :     ServicesManager
//
// Implementation:
//     <Notes on implementation>
//
// Original Author:  Chris Jones
//         Created:  Mon Sep  5 13:33:19 EDT 2005
//

// user include files
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescriptionFillerBase.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescriptionFillerPluginFactory.h"

#include "FWCore/ServiceRegistry/interface/ServicePluginFactory.h"
#include "FWCore/ServiceRegistry/interface/ServiceRegistry.h"
#include "FWCore/ServiceRegistry/interface/ServiceToken.h"
#include "FWCore/ServiceRegistry/interface/ServicesManager.h"

#include "FWCore/Utilities/interface/TypeDemangler.h"

// system include files
#include <set>
#include <string>

//
// constants, enums and typedefs
//

namespace edm {
   namespace serviceregistry {

      ServicesManager::MakerHolder::MakerHolder(boost::shared_ptr<ServiceMakerBase> iMaker,
                                                ParameterSet& iPSet,
                                                ActivityRegistry& iRegistry) :
      maker_(iMaker),
      pset_(&iPSet),
      registry_(&iRegistry),
      wasAdded_(false) {}

      bool
      ServicesManager::MakerHolder::add(ServicesManager& oManager) const {
         if(!wasAdded_) {
            wasAdded_ = maker_->make(*pset_, *registry_, oManager);
            if(wasAdded_ && maker_->saveConfiguration()) {
               pset_->addUntrackedParameter("@save_config", true);
            }
         }
         return wasAdded_;
      }

      //
      // static data member definitions
      //

      //
      // constructors and destructor
      //
      ServicesManager::ServicesManager(std::vector<ParameterSet>& iConfiguration) :
      type2Maker_(new Type2Maker) {
         //First create the list of makers
         fillListOfMakers(iConfiguration);

         createServices();
      }

      ServicesManager::ServicesManager(ServiceToken iToken,
                                       ServiceLegacy iLegacy,
                                       std::vector<ParameterSet>& iConfiguration,
                                       bool associate) :
            associatedManager_(associate ? iToken.manager_ : boost::shared_ptr<ServicesManager>()),
            type2Maker_(new Type2Maker) {
         fillListOfMakers(iConfiguration);

         //find overlaps between services in iToken and iConfiguration
         typedef std::set< TypeIDBase> TypeSet;
         TypeSet configTypes;
         for(Type2Maker::iterator itType = type2Maker_->begin(), itTypeEnd = type2Maker_->end();
             itType != itTypeEnd;
             ++itType) {
            configTypes.insert(itType->first);
         }

         TypeSet tokenTypes;
         if(0 != iToken.manager_.get()) {
            for(Type2Service::iterator itType = iToken.manager_->type2Service_.begin(),
                itTypeEnd = iToken.manager_->type2Service_.end();
                itType != itTypeEnd;
                ++itType) {
               tokenTypes.insert(itType->first);
            }

            typedef std::set<TypeIDBase> IntersectionType;
            IntersectionType intersection;
            std::set_intersection(configTypes.begin(), configTypes.end(),
                                  tokenTypes.begin(), tokenTypes.end(),
                                  inserter(intersection, intersection.end()));

            switch(iLegacy) {
               case kOverlapIsError :
                  if(!intersection.empty()) {
                     throw Exception(errors::Configuration, "Service")
                     << "the Service " << (*type2Maker_).find(*(intersection.begin()))->second.pset_->getParameter<std::string>("@service_type")
                     << " already has an instance of that type of Service";
                  } else {
                     //get all the services from Token
                     type2Service_ = iToken.manager_->type2Service_;
                  }
                  break;
               case kTokenOverrides :
                  //get all the services from Token
                  type2Service_ = iToken.manager_->type2Service_;

                  //remove from type2Maker the overlapping services so we never try to make them
                  for(IntersectionType::iterator itType = intersection.begin(), itTypeEnd = intersection.end();
                      itType != itTypeEnd;
                      ++itType) {
                     Type2Maker::iterator itFound = type2Maker_->find(*itType);
                     //HLT needs it such that even if a service isn't created we store its PSet if needed
                     if(itFound->second.maker_->saveConfiguration()) {
                        itFound->second.pset_->addUntrackedParameter("@save_config", true);
                     }
                     type2Maker_->erase(itFound);
                  }
                  break;
               case kConfigurationOverrides:
                  //get all the services from the Configuration, except process wide services
                  type2Service_ = iToken.manager_->type2Service_;

                  //now remove the ones we do not want
                  for(IntersectionType::iterator itType = intersection.begin(), itTypeEnd = intersection.end();
                      itType != itTypeEnd;
                      ++itType) {
                     Type2Maker::iterator itFound = type2Maker_->find(*itType);
                     if(itFound->second.maker_->processWideService()) {
                       // This is a process wide service, so the token overrides the configuration.
                       //HLT needs it such that even if a service isn't created we store its PSet if needed
                       if(itFound->second.maker_->saveConfiguration()) {
                         itFound->second.pset_->addUntrackedParameter("@save_config", true);
                       }
                       std::string type;
                       typeDemangle(itType->name(), type);
                       LogInfo("Configuration") << "Warning: You have reconfigured service\n"
                                 <<  "'" << type << "' in a subprocess.\n"
                                 << "This service has already been configured.\n"
                                 << "This particular service may not be reconfigured in a subprocess.\n"
                                 << "The reconfiguration will be ignored.\n";
                       type2Maker_->erase(itFound);
                     } else {
                       // This is not a process wide service, so the configuration overrides the token.
                       type2Service_.erase(type2Service_.find(*itType));
                     }
                  }
                  break;
            }
            //make sure our signals are propagated to our 'inherited' Services
            if (associate) registry_.copySlotsFrom(associatedManager_->registry_);
         }
         createServices();
      }

      // ServicesManager::ServicesManager(ServicesManager const& rhs) {
      //    // do actual copying here;
      // }

      ServicesManager::~ServicesManager() {
         // Force the Service destructors to execute in the reverse order of construction.
         // Note that services passed in by a token are not included in this loop and
         // do not get destroyed until the ServicesManager object that created them is destroyed
         // which occurs after the body of this destructor is executed (the correct order).
         // Services directly passed in by a put and not created in the constructor
         // may or not be detroyed in the desired order because this class does not control
         // their creation (as I'm writing this comment everything in a standard cmsRun
         // executable is destroyed in the desired order).
         for(std::vector<TypeIDBase>::const_reverse_iterator idIter = actualCreationOrder_.rbegin(),
                                                             idEnd = actualCreationOrder_.rend();
              idIter != idEnd;
              ++idIter) {

            Type2Service::iterator itService = type2Service_.find(*idIter);

            if(itService != type2Service_.end()) {

               // This will cause the Service's destruction if
               // there are no other shared pointers around
               itService->second.reset();
            }
         }
      }

      //
      // assignment operators
      //
      // ServicesManager const& ServicesManager::operator=(ServicesManager const& rhs) {
      //   //An exception safe implementation is
      //   ServicesManager temp(rhs);
      //   swap(rhs);
      //
      //   return *this;
      // }

      //
      // member functions
      //
      void
      ServicesManager::connect(ActivityRegistry& iOther) {
         registry_.connect(iOther);
      }

      void
      ServicesManager::connectTo(ActivityRegistry& iOther) {
         iOther.connect(registry_);
      }

      void
      ServicesManager::copySlotsFrom(ActivityRegistry& iOther) {
        registry_.copySlotsFrom(iOther);
      }

      void
      ServicesManager::copySlotsTo(ActivityRegistry& iOther) {
        iOther.copySlotsFrom(registry_);
      }

      void
      ServicesManager::fillListOfMakers(std::vector<ParameterSet>& iConfiguration) {
         for(std::vector<ParameterSet>::iterator itParam = iConfiguration.begin(),
              itParamEnd = iConfiguration.end();
              itParam != itParamEnd;
              ++itParam) {
            boost::shared_ptr<ServiceMakerBase> base(ServicePluginFactory::get()->create(itParam->getParameter<std::string>("@service_type")));

            if(0 == base.get()) {
               throw Exception(errors::Configuration, "Service")
               << "could not find a service named "
               << itParam->getParameter<std::string>("@service_type")
               << ". Please check spelling.";
            }
            Type2Maker::iterator itFound = type2Maker_->find(TypeIDBase(base->serviceType()));
            if(itFound != type2Maker_->end()) {
               throw Exception(errors::Configuration, "Service")
               << " the service " << itParam->getParameter<std::string>("@service_type")
               << " provides the same service as "
               << itFound->second.pset_->getParameter<std::string>("@service_type")
               << "\n Please reconfigure job to only use one of these services.";
            }
            type2Maker_->insert(Type2Maker::value_type(TypeIDBase(base->serviceType()),
                                                        MakerHolder(base,
                                                                    *itParam,
                                                                    registry_)));
            requestedCreationOrder_.push_back(TypeIDBase(base->serviceType()));
         }
      }

      namespace {
         struct NoOp {
            void operator()(ServicesManager*) {}
         };
      }

      void
      ServicesManager::createServices() {

         //create a shared_ptr of 'this' that will not delete us
         boost::shared_ptr<ServicesManager> shareThis(this, NoOp());

         ServiceToken token(shareThis);

         //Now make our services to ones obtained via ServiceRegistry
         // when this goes out of scope, it will revert back to the previous Service set
         ServiceRegistry::Operate operate(token);

         //Now, make each Service.  If a service depends on a service that has yet to be
         // created, that other service will automatically be made

         for(std::vector<TypeIDBase>::const_iterator idIter = requestedCreationOrder_.begin(),
                                                     idEnd = requestedCreationOrder_.end();
              idIter != idEnd;
              ++idIter) {
           Type2Maker::iterator itMaker = type2Maker_->find(*idIter);

           // Check to make sure this maker is still there.  They are deleted
           // sometimes and that is OK.
           if(itMaker != type2Maker_->end()) {

             std::string serviceType = itMaker->second.pset_->getParameter<std::string>("@service_type");
             std::auto_ptr<ParameterSetDescriptionFillerBase> filler(
               ParameterSetDescriptionFillerPluginFactory::get()->create(serviceType));
             ConfigurationDescriptions descriptions(filler->baseType());

             try {
               filler->fill(descriptions);
             }
             catch (cms::Exception& iException) {
               Exception toThrow(errors::Configuration, "Failed while filling ParameterSetDescriptions.");
               toThrow << "\nService plugin name is \"" << serviceType << "\"\n";
               toThrow.append(iException);
               throw toThrow;
             }
             try {
               descriptions.validate(*(itMaker->second.pset_), serviceType);
             }
             catch (cms::Exception& iException) {
               Exception toThrow(errors::Configuration, "Failed validating service configuration.");
               toThrow << "\nService plugin name is \"" << serviceType << "\"\n";
               toThrow.append(iException);
               throw toThrow;
             }
             try {
               // This creates the service
               itMaker->second.add(*this);
             }
             catch(cms::Exception& iException) {
               Exception toThrow(errors::Configuration, "Error occurred while creating ");
               toThrow << itMaker->second.pset_->getParameter<std::string>("@service_type") << "\n";
               toThrow.append(iException);
               throw toThrow;
             }
           }
         }
         //No longer need the makers
         type2Maker_.reset();
      }
      //
      // const member functions
      //

      //
      // static member functions
      //
   }
}