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 // Copyright 2020, Jefferson Science Associates, LLC.
 // Subject to the terms in the LICENSE file found in the top-level directory.
 
 #include <JANA/JApplication.h>
 #include <JANA/JEventSource.h>
 #include <JANA/Engine/JExecutionEngine.h>
 #include <JANA/Services/JComponentManager.h>
 #include <JANA/Services/JGlobalRootLock.h>
 #include <JANA/Services/JParameterManager.h>
 #include <JANA/Services/JPluginLoader.h>
 #include <JANA/Topology/JTopologyBuilder.h>
 #include <JANA/Services/JWiringService.h>
 #include <JANA/Utils/JCpuInfo.h>
 #include <JANA/Utils/JApplicationInspector.h>
 
 #include <chrono>
 #include <sstream>
 #include <unistd.h>
 
 JApplication *japp = nullptr;
 
 
 JApplication::JApplication(JParameterManager* params) {
 
     // We set up some very essential services here, but note 
     // that they won't have been initialized yet. We need them now
     // so that they can passively receive components, plugin names, parameter values, etc.
     // These passive operations don't require any parameters, services, or
     // logging output, so they don't need to be initialized until later.
     // They will be fully initialized in JApplication::Initialize().
     // Only then they will be exposed to the user through the service locator.
 
     if (params == nullptr) {
         m_params = std::make_shared<JParameterManager>();
     }
     else {
         m_params = std::shared_ptr<JParameterManager>(params);
     }
     m_component_manager = std::make_shared<JComponentManager>();
     m_plugin_loader = std::make_shared<JPluginLoader>();
     m_service_locator = std::make_unique<JServiceLocator>();
     m_execution_engine = std::make_unique<JExecutionEngine>();
 
     ProvideService(m_params);
     ProvideService(m_component_manager);
     ProvideService(m_plugin_loader);
     ProvideService(m_execution_engine);
     ProvideService(std::make_shared<JGlobalRootLock>());
     ProvideService(std::make_shared<JTopologyBuilder>());
     ProvideService(std::make_shared<jana::services::JWiringService>());
 
 }
 
 
 JApplication::~JApplication() {}
 
 
 // Loading plugins
 
 void JApplication::AddPlugin(std::string plugin_name) {
     m_plugin_loader->add_plugin(plugin_name);
 }
 
 void JApplication::AddPluginPath(std::string path) {
     m_plugin_loader->add_plugin_path(path);
 }
 
 
 // Building a ProcessingTopology
 
 void JApplication::Add(JEventSource* event_source) {
     /// Adds the given JEventSource to the JANA context. Ownership is passed to JComponentManager.
     m_component_manager->add(event_source);
 }
 
 void JApplication::Add(JEventSourceGenerator *source_generator) {
     /// Adds the given JEventSourceGenerator to the JANA context. Ownership is passed to JComponentManager.
     m_component_manager->add(source_generator);
 }
 
 void JApplication::Add(JFactoryGenerator *factory_generator) {
     /// Adds the given JFactoryGenerator to the JANA context. Ownership is passed to JComponentManager.
     m_component_manager->add(factory_generator);
 }
 
 void JApplication::Add(JEventProcessor* processor) {
     /// Adds the given JEventProcessor to the JANA context. Ownership is passed to JComponentManager.
     m_component_manager->add(processor);
 }
 
 void JApplication::Add(std::string event_source_name) {
     /// Adds the event source name (e.g. a file or socket name) to the JANA context. JANA will instantiate
     /// the corresponding JEventSource using a user-provided JEventSourceGenerator.
     m_component_manager->add(event_source_name);
 }
 
 void JApplication::Add(JEventUnfolder* unfolder) {
     /// Adds the given JEventUnfolder to the JANA context. Ownership is passed to JComponentManager.
     m_component_manager->add(unfolder);
 }
 
 
 void JApplication::Initialize() {
 
     /// Initialize the application in preparation for data processing.
     /// This is called by the Run method so users will usually not need to call this directly.
 
     // Only run this once
     if (m_initialized) return;
 
     // Now that all parameters, components, plugin names, etc have been set, 
     // we can expose our builtin services to the user via GetService()
     m_services_available = true;
 
     // We trigger initialization 
     m_service_locator->get<JParameterManager>();
     auto component_manager = m_service_locator->get<JComponentManager>();
     auto plugin_loader = m_service_locator->get<JPluginLoader>();
     auto topology_builder = m_service_locator->get<JTopologyBuilder>();
     auto wiring_service = m_service_locator->get<jana::services::JWiringService>();
 
     // Set logger on JApplication itself
     m_logger = m_params->GetLogger("jana");
 
     if (m_logger.level > JLogger::Level::INFO) {
         std::ostringstream oss;
         oss << "Initializing..." << std::endl << std::endl;
         JVersion::PrintVersionDescription(oss);
         LOG_INFO(m_logger) << oss.str() << LOG_END;
     }
     else {
         std::ostringstream oss;
         oss << "Initializing..." << std::endl;
         JVersion::PrintSplash(oss);
         JVersion::PrintVersionDescription(oss);
         LOG_INFO(m_logger) << oss.str() << LOG_END;
     }
 
     // Attach all plugins
     for (const auto& plugin_name : wiring_service->GetPluginNames()) {
         plugin_loader->add_plugin(plugin_name);
     }
     plugin_loader->attach_plugins(component_manager.get());
 
     // Resolve and initialize all components
     component_manager->configure_components();
 
     // Once all components have been wired in jcm::configure_components(), there shouldn't be any unused wirings
     wiring_service->CheckAllWiringsAreUsed();
 
     // Set desired nthreads. We parse the 'nthreads' parameter two different ways for backwards compatibility.
     m_desired_nthreads = 1;
     m_params->SetDefaultParameter("nthreads", m_desired_nthreads, "Desired number of worker threads, or 'Ncores' to use all available cores.");
     if (m_params->GetParameterValue<std::string>("nthreads") == "Ncores") {
         m_desired_nthreads = JCpuInfo::GetNumCpus();
     }
 
     topology_builder->create_topology();
 
     m_params->SetDefaultParameter("jana:inspect", m_inspect, "Controls whether to drop immediately into the Inspector upon Run()");
 
     auto execution_engine = m_service_locator->get<JExecutionEngine>();
 
     // Make sure that Init() is called on any remaining JServices
     m_service_locator->InitAllServices();
 
     m_initialized = true;
     // This needs to be at the end so that m_initialized==false while InitPlugin() is being called
 }
 
 /// @brief Run the application, launching 1 or more threads to do the work.
 ///
 /// This will initialize the application, attaching plugins etc. and launching
 /// threads to process events/time slices. This will then either return immediately
 /// (if wait_until_finish=false) or enter a lazy loop checking the progress
 /// of the data processing (if wait_until_finish=true).
 ///
 /// In the `wait_until_finished` mode, this will run continuously until 
 /// the JProcessingController indicates it is finished or stopped or 
 /// some other condition exists that would cause it to end early. Under
 /// normal conditions, the data processing stops when polling JProcessingController::is_finished()
 /// indicates the JArrowTopology is in the `JArrowTopology::Status::Finished`
 /// state. This will occur when all event sources have been exhausted and
 /// all events have been processed such that all JWorkers have stopped.
 ///
 /// See JProcessingController::run() for more details.
 ///
 /// @param [in] wait_until_finished If true (default) do not return until the work has completed.
 void JApplication::Run(bool wait_until_stopped, bool finish) {
 
     Initialize();
     if(m_quitting) return;
 
     // At this point, all components should have been provided and all parameter values should have been set.
     // Let's report what we found!
     //
     // You might be wondering why we do this here instead of at the end of Initialize(), which might make more sense.
     // The reason is that there might be other things, specifically JBenchmarker, that do request Parameters and Services
     // but aren't JComponents (yet). These have to happen after JApplication::Initialize() and before the parameter table
     // gets printed. Because of their weird position, they are not able to add additional plugins or components, nor 
     // submit Parameter values.
     //
     // Print summary of all config parameters
     m_params->PrintParameters();
 
     LOG_WARN(m_logger) << "Starting processing with " << m_desired_nthreads << " threads requested..." << LOG_END;
     m_execution_engine->ScaleWorkers(m_desired_nthreads);
     if (m_inspect) {
         m_execution_engine->RequestInspector();
     }
     else {
         m_execution_engine->RunTopology();
     }
 
     if (!wait_until_stopped) {
         return;
     }
 
     m_execution_engine->RunSupervisor();
     if (finish) {
         m_execution_engine->FinishTopology();
     }
 
     // Join all threads
     if (!m_skip_join) {
         m_execution_engine->ScaleWorkers(0);
     }
 }
 
 
 void JApplication::Scale(int nthreads) {
     LOG_WARN(m_logger) << "Scaling to " << nthreads << " threads" << LOG_END;
     m_execution_engine->ScaleWorkers(nthreads);
     m_execution_engine->RunTopology();
 }
 
 
 void JApplication::Stop(bool wait_until_stopped, bool finish) {
     if (!m_initialized) {
         // People might call Stop() during Initialize() rather than Run().
         // For instance, during JEventProcessor::Init, or via Ctrl-C.
         // If this is the case, we finish with initialization and then cancel the Run().
         // We don't wait on  because we don't want to Finalize() anything
         // we haven't Initialize()d yet.
         m_quitting = true;
     }
     else {
         // Once we've called Initialize(), we can Finish() all of our components
         // whenever we like
         m_execution_engine->DrainTopology();
         if (wait_until_stopped) {
             m_execution_engine->RunSupervisor();
             if (finish) {
                 m_execution_engine->FinishTopology();
             }
         }
     }
 }
 
 void JApplication::Quit(bool skip_join) {
 
     if (m_initialized) {
         m_skip_join = skip_join;
         m_quitting = true;
         if (!skip_join && m_execution_engine != nullptr) {
             Stop(true);
         }
     }
 
     // People might call Quit() during Initialize() rather than Run().
     // For instance, during JEventProcessor::Init, or via Ctrl-C.
     // If this is the case, we exit immediately rather than make the user
     // wait on a long Initialize() if no data has been generated yet.
 
     _exit(m_exit_code);
 }
 
 void JApplication::SetExitCode(int exit_code) {
     /// Set a value of the exit code in that can be later retrieved
     /// using GetExitCode. This is so the executable can return
     /// a meaningful error code if processing is stopped prematurely,
     /// but the program is able to stop gracefully without a hard
     /// exit. See also GetExitCode.
 
     m_exit_code = exit_code;
 }
 
 int JApplication::GetExitCode() {
     /// Returns the currently set exit code. This can be used by
     /// JProcessor/JFactory classes to communicate an appropriate
     /// exit code that a jana program can return upon exit. The
     /// value can be set via the SetExitCode method.
 
     return m_exit_code;
 }
 
 const JComponentSummary& JApplication::GetComponentSummary() {
     /// Returns a data object describing all components currently running
     return m_component_manager->get_component_summary();
 }
 
 // Performance/status monitoring
 void JApplication::SetTicker(bool ticker_on) {
     m_execution_engine->SetTickerEnabled(ticker_on);
 }
 
 bool JApplication::IsTickerEnabled() {
     return m_execution_engine->IsTickerEnabled();
 }
 
 void JApplication::SetTimeoutEnabled(bool enabled) {
     m_execution_engine->SetTimeoutEnabled(enabled);
 }
 
 bool JApplication::IsTimeoutEnabled() {
     return m_execution_engine->IsTimeoutEnabled();
 }
 
 bool JApplication::IsDrainingQueues() {
     return (m_execution_engine->GetRunStatus() == JExecutionEngine::RunStatus::Draining);
 }
 
 /// Returns the number of threads currently being used.
 uint64_t JApplication::GetNThreads() {
     return m_execution_engine->GetPerf().thread_count;
 }
 
 /// Returns the number of events processed since Run() was called.
 uint64_t JApplication::GetNEventsProcessed() {
     return m_execution_engine->GetPerf().event_count;
 }
 
 /// Returns the total integrated throughput so far in Hz since Run() was called.
 float JApplication::GetIntegratedRate() {
     return m_execution_engine->GetPerf().throughput_hz;
 }
 
 /// Returns the 'instantaneous' throughput in Hz since the last such call was made.
 float JApplication::GetInstantaneousRate()
 {
     std::lock_guard<std::mutex> lock(m_inst_rate_mutex);
     auto latest_event_count = m_execution_engine->GetPerf().event_count;
     auto latest_time = JExecutionEngine::clock_t::now();
     
     auto duration_ms = std::chrono::duration_cast<std::chrono::milliseconds>(latest_time - m_last_measurement_time).count();
     auto instantaneous_throughput = (duration_ms == 0) ? 0 : (latest_event_count - m_last_event_count) * 1000.0 / duration_ms;
 
     m_last_event_count = latest_event_count;
     m_last_measurement_time = latest_time;
 
     return instantaneous_throughput;
 }
 
 void JApplication::PrintStatus() {
     auto perf = m_execution_engine->GetPerf();
     LOG_INFO(m_logger) << "Topology status:     " << ToString(perf.runstatus) << LOG_END;
     LOG_INFO(m_logger) << "Worker thread count: " << perf.thread_count << LOG_END;
     LOG_INFO(m_logger) << "Events processed:    " << perf.event_count << LOG_END;
     LOG_INFO(m_logger) << "Uptime [s]:          " << perf.uptime_ms*1000 << LOG_END;
     LOG_INFO(m_logger) << "Throughput [Hz]:     " << perf.throughput_hz << LOG_END;
 }
 
 
 

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