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#ifndef FWCore_Framework_Schedule_h
#define FWCore_Framework_Schedule_h

/*
  Author: Jim Kowalkowski  28-01-06

  A class for creating a schedule based on paths in the configuration file.
  The schedule is maintained as a sequence of paths.
  After construction, events can be fed to the object and passed through
  all the modules in the schedule.  All accounting about processing
  of events by modules and paths is contained here or in object held
  by containment.

  The trigger results producer and product are generated and managed here.
  This class also manages endpaths and calls to endjob and beginjob.
  Endpaths are just treated as a simple list of modules that need to
  do processing of the event and do not participate in trigger path
  activities.

  This class requires the high-level process pset.  It uses @process_name.
  If the high-level pset contains an "options" pset, then the
  following optional parameter can be present:
  bool wantSummary = true/false   # default false

  wantSummary indicates whether or not the pass/fail/error stats
  for modules and paths should be printed at the end-of-job.

  A TriggerResults object will always be inserted into the event
  for any schedule.  The producer of the TriggerResults EDProduct
  is always the first module in the endpath.  The TriggerResultInserter
  is given a fixed label of "TriggerResults".

  Processing of an event happens by pushing the event through the Paths.
  The scheduler performs the reset() on each of the workers independent
  of the Path objects.

  ------------------------

  About Paths:
  Paths fit into two categories:
  1) trigger paths that contribute directly to saved trigger bits
  2) end paths
  The Schedule holds these paths in two data structures:
  1) main path list
  2) end path list

  Trigger path processing always precedes endpath processing.
  The order of the paths from the input configuration is
  preserved in the main paths list.

  ------------------------

  The Schedule uses the TriggerNamesService to get the names of the
  trigger paths and end paths. When a TriggerResults object is created
  the results are stored in the same order as the trigger names from
  TriggerNamesService.

*/

#include "DataFormats/Common/interface/HLTGlobalStatus.h"
#include "FWCore/Framework/interface/Actions.h"
#include "FWCore/Framework/interface/EventPrincipal.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/OccurrenceTraits.h"
#include "FWCore/Framework/interface/UnscheduledHandler.h"
#include "FWCore/Framework/src/Path.h"
#include "FWCore/Framework/src/RunStopwatch.h"
#include "FWCore/Framework/src/Worker.h"
#include "FWCore/Framework/src/WorkerRegistry.h"
#include "FWCore/MessageLogger/interface/JobReport.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Utilities/interface/Algorithms.h"

#include "boost/shared_ptr.hpp"

#include <map>
#include <memory>
#include <set>
#include <string>
#include <vector>

namespace edm {
  namespace service {
    class TriggerNamesService;
  }
  class ActivityRegistry;
  class EventSetup;
  class OutputWorker;
  class RunStopwatch;
  class UnscheduledCallProducer;
  class WorkerInPath;
  class Schedule {
  public:
    typedef std::vector<std::string> vstring;
    typedef std::vector<Path> TrigPaths;
    typedef std::vector<Path> NonTrigPaths;
    typedef boost::shared_ptr<HLTGlobalStatus> TrigResPtr;
    typedef boost::shared_ptr<Worker> WorkerPtr;
    typedef std::vector<Worker*> AllWorkers;
    typedef std::vector<OutputWorker*> AllOutputWorkers;

    typedef std::vector<Worker*> Workers;

    typedef std::vector<WorkerInPath> PathWorkers;

    Schedule(ParameterSet& proc_pset,
             service::TriggerNamesService& tns,
             ProductRegistry& pregistry,
             ActionTable const& actions,
             boost::shared_ptr<ActivityRegistry> areg,
             boost::shared_ptr<ProcessConfiguration> processConfiguration);

    enum State { Ready = 0, Running, Latched };

    template <typename T>
    void processOneOccurrence(typename T::MyPrincipal& principal, EventSetup const& eventSetup);

    void beginJob();
    void endJob();

    // Write the luminosity block
    void writeLumi(LuminosityBlockPrincipal const& lbp);

    // Write the run
    void writeRun(RunPrincipal const& rp);

    // Call closeFile() on all OutputModules.
    void closeOutputFiles();

    // Call openNewFileIfNeeded() on all OutputModules
    void openNewOutputFilesIfNeeded();

    // Call openFiles() on all OutputModules
    void openOutputFiles(FileBlock& fb);

    // Call respondToOpenInputFile() on all Modules
    void respondToOpenInputFile(FileBlock const& fb);

    // Call respondToCloseInputFile() on all Modules
    void respondToCloseInputFile(FileBlock const& fb);

    // Call respondToOpenOutputFiles() on all Modules
    void respondToOpenOutputFiles(FileBlock const& fb);

    // Call respondToCloseOutputFiles() on all Modules
    void respondToCloseOutputFiles(FileBlock const& fb);

    // Call shouldWeCloseFile() on all OutputModules.
    bool shouldWeCloseOutput() const;

    void preForkReleaseResources();
    void postForkReacquireResources(unsigned int iChildIndex, unsigned int iNumberOfChildren);

    std::pair<double, double> timeCpuReal() const {
      return std::pair<double, double>(stopwatch_->cpuTime(), stopwatch_->realTime());
    }


    std::vector<ModuleDescription const*> getAllModuleDescriptions() const;

    void availablePaths(std::vector<std::string>& oLabelsToFill) const;

    void modulesInPath(std::string const& iPathLabel,
                       std::vector<std::string>& oLabelsToFill) const;

    int totalEvents() const {
      return total_events_;
    }

    int totalEventsPassed() const {
      return total_passed_;
    }

    int totalEventsFailed() const {
      return totalEvents() - totalEventsPassed();
    }

    void enableEndPaths(bool active);

    bool endPathsEnabled() const;

    void getTriggerReport(TriggerReport& rep) const;

    bool const terminate() const;

    void clearCounters();

    bool changeModule(std::string const& iLabel, ParameterSet const& iPSet);

  private:

    AllWorkers::const_iterator workersBegin() const {
      return all_workers_.begin();
    }

    AllWorkers::const_iterator workersEnd() const {
      return all_workers_.end();
    }

    AllWorkers::iterator workersBegin() {
      return  all_workers_.begin();
    }

    AllWorkers::iterator workersEnd() {
      return all_workers_.end();
    }

    void resetAll();

    template <typename T>
    bool runTriggerPaths(typename T::MyPrincipal&, EventSetup const&);

    template <typename T>
    void runEndPaths(typename T::MyPrincipal&, EventSetup const&);

    void setupOnDemandSystem(EventPrincipal& principal, EventSetup const& es);

    void reportSkipped(EventPrincipal const& ep) const;
    void reportSkipped(LuminosityBlockPrincipal const&) const {}
    void reportSkipped(RunPrincipal const&) const {}

    void fillWorkers(ParameterSet& proc_pset,
                     ProductRegistry& preg,
                     boost::shared_ptr<ProcessConfiguration const> processConfiguration,
                     std::string const& name, bool ignoreFilters, PathWorkers& out);
    void fillTrigPath(ParameterSet& proc_pset,
                      ProductRegistry& preg,
                      boost::shared_ptr<ProcessConfiguration const> processConfiguration,
                      int bitpos, std::string const& name, TrigResPtr);
    void fillEndPath(ParameterSet& proc_pset,
                     ProductRegistry& preg,
                     boost::shared_ptr<ProcessConfiguration const> processConfiguration,
                     int bitpos, std::string const& name);

    void limitOutput(ParameterSet const& proc_pset);

    void addToAllWorkers(Worker* w);

    WorkerRegistry                                worker_reg_;
    ActionTable const*                            act_table_;
    boost::shared_ptr<ActivityRegistry>           actReg_;

    State                    state_;
    vstring                  trig_name_list_;
    vstring                  end_path_name_list_;

    TrigResPtr               results_;
    TrigResPtr               endpath_results_;

    WorkerPtr                results_inserter_;
    AllWorkers               all_workers_;
    AllOutputWorkers         all_output_workers_;
    TrigPaths                trig_paths_;
    TrigPaths                end_paths_;

    bool                           wantSummary_;
    int                            total_events_;
    int                            total_passed_;
    RunStopwatch::StopwatchPointer stopwatch_;

    boost::shared_ptr<UnscheduledCallProducer> unscheduled_;

    volatile bool           endpathsAreActive_;
  };

  // -----------------------------
  // ProcessOneOccurrence is a functor that has bound a specific
  // Principal and Event Setup, and can be called with a Path, to
  // execute Path::processOneOccurrence for that event

  template <typename T>
  class ProcessOneOccurrence {
  public:
    typedef void result_type;
    ProcessOneOccurrence(typename T::MyPrincipal& principal, EventSetup const& setup) :
      ep(principal), es(setup) {};

      void operator()(Path& p) {p.processOneOccurrence<T>(ep, es);}

  private:
    typename T::MyPrincipal&   ep;
    EventSetup const& es;
  };

  class UnscheduledCallProducer : public UnscheduledHandler {
  public:
    UnscheduledCallProducer() : UnscheduledHandler(), labelToWorkers_() {}
    void addWorker(Worker* aWorker) {
      assert(0 != aWorker);
      labelToWorkers_[aWorker->description().moduleLabel()] = aWorker;
    }

    template <typename T>
    void runNow(typename T::MyPrincipal& p, EventSetup const& es) {
      //do nothing for event since we will run when requested
      if(!T::isEvent_) {
        for(std::map<std::string, Worker*>::iterator it = labelToWorkers_.begin(), itEnd=labelToWorkers_.end();
            it != itEnd;
            ++it) {
          CPUTimer timer;
          it->second->doWork<T>(p, es, 0, &timer);
        }
      }
    }

  private:
    virtual bool tryToFillImpl(std::string const& moduleLabel,
                               EventPrincipal& event,
                               EventSetup const& eventSetup,
                               CurrentProcessingContext const* iContext) {
      std::map<std::string, Worker*>::const_iterator itFound =
        labelToWorkers_.find(moduleLabel);
      if(itFound != labelToWorkers_.end()) {
        CPUTimer timer;
        itFound->second->doWork<OccurrenceTraits<EventPrincipal, BranchActionBegin> >(event, eventSetup, iContext, &timer);
        return true;
      }
      return false;
    }
    std::map<std::string, Worker*> labelToWorkers_;
  };

  void
  inline
  Schedule::reportSkipped(EventPrincipal const& ep) const {
    Service<JobReport> reportSvc;
    reportSvc->reportSkippedEvent(ep.id().run(), ep.id().event());
  }

  template <typename T>
  void
  Schedule::processOneOccurrence(typename T::MyPrincipal& ep, EventSetup const& es) {
    this->resetAll();
    state_ = Running;

    // A RunStopwatch, but only if we are processing an event.
    RunStopwatch stopwatch(T::isEvent_ ? stopwatch_ : RunStopwatch::StopwatchPointer());

    if (T::isEvent_) {
      ++total_events_;
      setupOnDemandSystem(dynamic_cast<EventPrincipal&>(ep), es);
    }
    try {
      try {
        //make sure the unscheduled items see this transition [Event will be a no-op]
        unscheduled_->runNow<T>(ep, es);
        if (runTriggerPaths<T>(ep, es)) {
          if (T::isEvent_) ++total_passed_;
        }
        state_ = Latched;
      }
      catch(cms::Exception& e) {
        actions::ActionCodes action = (T::isEvent_ ? act_table_->find(e.rootCause()) : actions::Rethrow);
        assert (action != actions::IgnoreCompletely);
        assert (action != actions::FailPath);
        assert (action != actions::FailModule);
        if (action == actions::SkipEvent) {
            LogWarning(e.category())
              << "an exception occurred and all paths for the event are being skipped: \n"
              << e.what();
        } else {
           throw;
        }
      }

      try {
        CPUTimer timer;
        if (results_inserter_.get()) results_inserter_->doWork<T>(ep, es, 0, &timer);
      }
      catch (cms::Exception& e) {
        e << "EventProcessingStopped\n";
        e << "Attempt to insert TriggerResults into event failed.\n";
        throw;
      }

      if (endpathsAreActive_) runEndPaths<T>(ep, es);
    }
    catch(cms::Exception& e) {
      actions::ActionCodes action = (T::isEvent_ ? act_table_->find(e.rootCause()) : actions::Rethrow);
      assert (action != actions::SkipEvent);
      assert (action != actions::FailPath);
      assert (action != actions::FailModule);
      switch(action) {
      case actions::IgnoreCompletely: {
          LogWarning(e.category())
            << "exception being ignored for current event:\n"
            << e.what();
          break;
      }
      default: {
        state_ = Ready;
        e << "EventProcessingStopped\n";
        e << "an exception occurred during current event processing\n";
        throw;
      }
      }
    }
    catch(...) {
      LogError("PassingThrough")
        << "an exception occurred during current event processing\n";
      state_ = Ready;
      throw;
    }

    // next thing probably is not needed, the product insertion code clears it
    state_ = Ready;

  }

  template <typename T>
  bool
  Schedule::runTriggerPaths(typename T::MyPrincipal& ep, EventSetup const& es) {
    for_all(trig_paths_, ProcessOneOccurrence<T>(ep, es));
    return results_->accept();
  }

  template <typename T>
  void
  Schedule::runEndPaths(typename T::MyPrincipal& ep, EventSetup const& es) {
    // Note there is no state-checking safety controlling the
    // activation/deactivation of endpaths.
    for_all(end_paths_, ProcessOneOccurrence<T>(ep, es));

    // We could get rid of the functor ProcessOneOccurrence if we used
    // boost::lambda, but the use of lambda with member functions
    // which take multiple arguments, by both non-const and const
    // reference, seems much more obscure...
    //
    // using namespace boost::lambda;
    // for_all(end_paths_,
    //          bind(&Path::processOneOccurrence,
    //               boost::lambda::_1, // qualification to avoid ambiguity
    //               var(ep),           //  pass by reference (not copy)
    //               constant_ref(es))); // pass by const-reference (not copy)
  }
}

#endif