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 // Copyright 2024, Jefferson Science Associates, LLC.
 // Subject to the terms in the LICENSE file found in the top-level directory.
 
 #pragma once
 
 #include <JANA/Components/JComponent.h>
 #include <JANA/Components/JHasInputs.h>
 #include <JANA/Components/JHasOutputs.h>
 #include <JANA/Components/JHasRunCallbacks.h>
 #include <JANA/JEvent.h>
 
 class JApplication;
 class JEventFolder : public jana::components::JComponent, 
                      public jana::components::JHasRunCallbacks,
                      public jana::components::JHasInputs, 
                      public jana::components::JHasOutputs {
 
 private:
     int32_t m_last_run_number = -1;
     JEventLevel m_child_level;
     bool m_call_preprocess_upstream = true;
 
 
 public:
     
     JEventFolder() = default;
     virtual ~JEventFolder() {};
  
     virtual void Init() {};
     
     virtual void Preprocess(const JEvent& /*parent*/) const {};
 
     virtual void Fold(const JEvent& /*child*/, JEvent& /*parent*/, int /*item_nr*/) {
         throw JException("Not implemented yet!");
     };
 
     virtual void Finish() {};
 
 
     // Configuration
 
     void SetParentLevel(JEventLevel level) { m_level = level; }
 
     void SetChildLevel(JEventLevel level) { m_child_level = level; }
 
     void SetCallPreprocessUpstream(bool call_upstream) { m_call_preprocess_upstream = call_upstream; }
     
     JEventLevel GetChildLevel() { return m_child_level; }
 
 
  public:
     // Backend
     
     void DoInit() {
         std::lock_guard<std::mutex> lock(m_mutex);
         if (m_status != Status::Uninitialized) {
             throw JException("JEventFolder: Attempting to initialize twice or from an invalid state");
         }
         // TODO: Obtain overrides of collection names from param manager
         for (auto* parameter : m_parameters) {
             parameter->Init(*(m_app->GetJParameterManager()), m_prefix);
         }
         for (auto* service : m_services) {
             service->Fetch(m_app);
         }
         CallWithJExceptionWrapper("JEventFolder::Init", [&](){Init();});
         m_status = Status::Initialized;
     }
 
     void DoPreprocess(const JEvent& child) {
         {
             std::lock_guard<std::mutex> lock(m_mutex);
             if (m_status != Status::Initialized) {
                 throw JException("JEventFolder: Component needs to be initialized and not finalized before Fold can be called");
             }
         }
         for (auto* input : m_inputs) {
             input->PrefetchCollection(child);
         }
         for (auto* variadic_input : m_variadic_inputs) {
             variadic_input->PrefetchCollection(child);
         }
         if (m_callback_style != CallbackStyle::DeclarativeMode) {
             CallWithJExceptionWrapper("JEventFolder::Preprocess", [&](){
                 Preprocess(child);
             });
         }
     }
 
     void DoFold(const JEvent& child, JEvent& parent) {
         std::lock_guard<std::mutex> lock(m_mutex);
         if (m_status != Status::Initialized) {
             throw JException("Component needs to be initialized and not finalized before Fold() can be called");
         }
         if (!m_call_preprocess_upstream) {
             CallWithJExceptionWrapper("JEventFolder::Preprocess", [&](){
                 Preprocess(child);
             });
         }
         if (m_last_run_number != parent.GetRunNumber()) {
             for (auto* resource : m_resources) {
                 resource->ChangeRun(parent.GetRunNumber(), m_app);
             }
             if (m_callback_style == CallbackStyle::DeclarativeMode) {
                 CallWithJExceptionWrapper("JEventFolder::ChangeRun", [&](){
                     ChangeRun(parent.GetRunNumber());
                 });
             }
             else {
                 CallWithJExceptionWrapper("JEventFolder::ChangeRun", [&](){
                     ChangeRun(parent);
                 });
             }
             m_last_run_number = parent.GetRunNumber();
         }
         for (auto* input : m_inputs) {
             input->GetCollection(child);
         }
         for (auto* variadic_input : m_variadic_inputs) {
             variadic_input->GetCollection(child);
         }
         for (auto* output : m_outputs) {
             output->Reset();
         }
         auto child_number = child.GetEventIndex();
         CallWithJExceptionWrapper("JEventFolder::Fold", [&](){
             Fold(child, parent, child_number);
         });
 
         for (auto* output : m_outputs) {
             output->InsertCollection(parent);
         }
     }
 
     void DoFinish() {
         std::lock_guard<std::mutex> lock(m_mutex);
         if (m_status != Status::Finalized) {
             CallWithJExceptionWrapper("JEventFolder::Finish", [&](){
                 Finish();
             });
             m_status = Status::Finalized;
         }
     }
 
     void Summarize(JComponentSummary& summary) const override {
         auto* us = new JComponentSummary::Component( 
             "Folder", GetPrefix(), GetTypeName(), GetLevel(), GetPluginName());
 
         for (const auto* input : m_inputs) {
             us->AddInput(new JComponentSummary::Collection("", input->GetDatabundleName(), input->GetTypeName(), input->GetLevel()));
         }
         for (const auto* input : m_variadic_inputs) {
             size_t subinput_count = input->GetRequestedDatabundleNames().size();
             for (size_t i=0; i<subinput_count; ++i) {
                 us->AddInput(new JComponentSummary::Collection("", input->GetRequestedDatabundleNames().at(i), input->GetTypeName(), input->GetLevel()));
             }
         }
         for (const auto* output : m_outputs) {
             size_t suboutput_count = output->collection_names.size();
             for (size_t i=0; i<suboutput_count; ++i) {
                 us->AddOutput(new JComponentSummary::Collection("", output->collection_names[i], output->type_name, GetLevel()));
             }
         }
         summary.Add(us);
     }
 
 };
 
 

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