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 // -*- C++ -*-
 //
 // Package:     PluginManager
 // Class  :     PluginManager
 //
 // Implementation:
 //     <Notes on implementation>
 //
 // Original Author:  Chris Jones
 //         Created:  Wed Apr  4 14:28:58 EDT 2007
 //
 
 // system include files
 #include <filesystem>
 #include <fstream>
 #include <functional>
 #include <set>
 
 // TEMPORARY
 #include "TInterpreter.h"
 #include "TVirtualMutex.h"
 
 // user include files
 #include "FWCore/PluginManager/interface/CacheParser.h"
 #include "FWCore/PluginManager/interface/PluginFactoryBase.h"
 #include "FWCore/PluginManager/interface/PluginFactoryManager.h"
 #include "FWCore/PluginManager/interface/PluginManager.h"
 #include "FWCore/PluginManager/interface/standard.h"
 #include "FWCore/Utilities/interface/Exception.h"
 #include "FWCore/Utilities/interface/thread_safety_macros.h"
 
 #include "PauseMaxMemoryPreloadSentry.h"
 
 namespace edmplugin {
   //
   // constants, enums and typedefs
   //
 
   //
   // static data member definitions
   //
 
   static bool readCacheFile(const std::filesystem::path& cacheFile,
                             const std::filesystem::path& dir,
                             PluginManager::CategoryToInfos& categoryToInfos) {
     if (exists(cacheFile)) {
       std::ifstream file(cacheFile.string().c_str());
       if (not file) {
         throw cms::Exception("PluginMangerCacheProblem")
             << "Unable to open the cache file '" << cacheFile.string() << "'. Please check permissions on file";
       }
       edm::PauseMaxMemoryPreloadSentry pauseSentry;
       CacheParser::read(file, dir, categoryToInfos);
       return true;
     }
     return false;
   }
   //
   // constructors and destructor
   //
   PluginManager::PluginManager(const PluginManager::Config& iConfig) : searchPath_(iConfig.searchPath()) {
     using std::placeholders::_1;
     const std::filesystem::path& kCacheFile(standard::cachefileName());
     // This is the filename of a file which contains plugins which exist in the
     // base release and which should exists in the local area, otherwise they
     // were removed and we want to catch their usage.
     const std::filesystem::path& kPoisonedCacheFile(standard::poisonedCachefileName());
     //NOTE: This may not be needed :/
     PluginFactoryManager* pfm = PluginFactoryManager::get();
     pfm->newFactory_.connect(std::bind(std::mem_fn(&PluginManager::newFactory), this, _1));
 
     // When building a single big executable the plugins are already registered in the
     // PluginFactoryManager, we therefore only need to populate the categoryToInfos_ map
     // with the relevant information.
     for (PluginFactoryManager::const_iterator i = pfm->begin(), e = pfm->end(); i != e; ++i) {
       categoryToInfos_[(*i)->category()] = (*i)->available();
     }
 
     //read in the files
     //Since we are looping in the 'precidence' order then the lists in categoryToInfos_ will also be
     // in that order
     bool foundAtLeastOneCacheFile = false;
     std::set<std::string> alreadySeen;
     for (SearchPath::const_iterator itPath = searchPath_.begin(), itEnd = searchPath_.end(); itPath != itEnd;
          ++itPath) {
       //take care of the case where the same path is passed in multiple times
       if (alreadySeen.find(*itPath) != alreadySeen.end()) {
         continue;
       }
       alreadySeen.insert(*itPath);
       std::filesystem::path dir(*itPath);
       if (exists(dir)) {
         if (not is_directory(dir)) {
           throw cms::Exception("PluginManagerBadPath")
               << "The path '" << dir.string() << "' for the PluginManager is not a directory";
         }
         std::filesystem::path cacheFile = dir / kCacheFile;
 
         if (readCacheFile(cacheFile, dir, categoryToInfos_)) {
           foundAtLeastOneCacheFile = true;
         }
 
         // We do not check for return code since we do not want to consider a
         // poison cache file as a valid cache file having been found.
         std::filesystem::path poisonedCacheFile = dir / kPoisonedCacheFile;
         readCacheFile(poisonedCacheFile, dir / "poisoned", categoryToInfos_);
       }
     }
     if (not foundAtLeastOneCacheFile and iConfig.mustHaveCache()) {
       auto ex = cms::Exception("PluginManagerNoCacheFile")
                 << "No cache files named '" << standard::cachefileName() << "' were found in the directories \n";
       for (auto const& seen : alreadySeen) {
         ex << " '" << seen << "'\n";
       }
       throw ex;
     }
     if (iConfig.mustHaveCache() and categoryToInfos_.empty()) {
       throw cms::Exception("PluginManagerCacheFilesEmpty") << "Cache files were found but all were empty.";
     }
     //Since this should not be called until after 'main' has started, we can set the value
     loadingLibraryNamed_() = "<loaded by another plugin system>";
   }
 
   // PluginManager::PluginManager(const PluginManager& rhs)
   // {
   //    // do actual copying here;
   // }
 
   PluginManager::~PluginManager() {}
 
   //
   // assignment operators
   //
   // const PluginManager& PluginManager::operator=(const PluginManager& rhs)
   // {
   //   //An exception safe implementation is
   //   PluginManager temp(rhs);
   //   swap(rhs);
   //
   //   return *this;
   // }
 
   //
   // member functions
   //
   void PluginManager::newFactory(const PluginFactoryBase*) {}
   //
   // const member functions
   //
   namespace {
     struct PICompare {
       bool operator()(const PluginInfo& iLHS, const PluginInfo& iRHS) const { return iLHS.name_ < iRHS.name_; }
     };
   }  // namespace
 
   const std::filesystem::path& PluginManager::loadableFor(const std::string& iCategory, const std::string& iPlugin) {
     bool throwIfFail = true;
     return loadableFor_(iCategory, iPlugin, throwIfFail);
   }
 
   const std::filesystem::path& PluginManager::loadableFor_(const std::string& iCategory,
                                                            const std::string& iPlugin,
                                                            bool& ioThrowIfFailElseSucceedStatus) {
     const bool throwIfFail = ioThrowIfFailElseSucceedStatus;
     ioThrowIfFailElseSucceedStatus = true;
     CategoryToInfos::iterator itFound = categoryToInfos_.find(iCategory);
     if (itFound == categoryToInfos_.end()) {
       if (throwIfFail) {
         throw cms::Exception("PluginNotFound") << "Unable to find plugin '" << iPlugin << "' because the category '"
                                                << iCategory << "' has no known plugins";
       } else {
         ioThrowIfFailElseSucceedStatus = false;
         static const std::filesystem::path s_path;
         return s_path;
       }
     }
 
     PluginInfo i;
     i.name_ = iPlugin;
     typedef std::vector<PluginInfo>::iterator PIItr;
     std::pair<PIItr, PIItr> range = std::equal_range(itFound->second.begin(), itFound->second.end(), i, PICompare());
 
     if (range.first == range.second) {
       if (throwIfFail) {
         throw cms::Exception("PluginNotFound") << "Unable to find plugin '" << iPlugin << "' in category '" << iCategory
                                                << "'. Please check spelling of name.";
       } else {
         ioThrowIfFailElseSucceedStatus = false;
         static const std::filesystem::path s_path;
         return s_path;
       }
     }
 
     if (range.second - range.first > 1) {
       //see if the come from the same directory
       if (range.first->loadable_.parent_path() == (range.first + 1)->loadable_.parent_path()) {
         //std::cout<<range.first->name_ <<" " <<(range.first+1)->name_<<std::endl;
         throw cms::Exception("MultiplePlugins")
             << "The plugin '" << iPlugin
             << "' is found in multiple files \n"
                " '"
             << range.first->loadable_.filename() << "'\n '" << (range.first + 1)->loadable_.filename()
             << "'\n"
                "in directory '"
             << range.first->loadable_.parent_path().string()
             << "'.\n"
                "The code must be changed so the plugin only appears in one plugin file. "
                "You will need to remove the macro which registers the plugin so it only appears in"
                " one of these files.\n"
                "  If none of these files register such a plugin, "
                "then the problem originates in a library to which all these files link.\n"
                "The plugin registration must be removed from that library since plugins are not allowed in regular "
                "libraries.";
       }
     }
 
     return range.first->loadable_;
   }
 
   namespace {
     class Sentry {
     public:
       Sentry(std::string& iPath, const std::string& iNewPath) : path_(iPath), oldPath_(iPath) { path_ = iNewPath; }
       ~Sentry() { path_ = oldPath_; }
 
     private:
       std::string& path_;
       std::string oldPath_;
     };
   }  // namespace
 
   const SharedLibrary& PluginManager::load(const std::string& iCategory, const std::string& iPlugin) {
     askedToLoadCategoryWithPlugin_(iCategory, iPlugin);
     const std::filesystem::path& p = loadableFor(iCategory, iPlugin);
 
     //have we already loaded this?
     auto itLoaded = loadables_.find(p);
     if (itLoaded == loadables_.end()) {
       //Need to make sure we only have on SharedLibrary loading at a time
       std::lock_guard<std::recursive_mutex> guard(pluginLoadMutex());
       //Another thread may have gotten this while we were waiting on the mutex
       itLoaded = loadables_.find(p);
       if (itLoaded == loadables_.end()) {
         //try to make one
         goingToLoad_(p);
         Sentry s(loadingLibraryNamed_(), p.string());
         //std::filesystem::path native(p.string());
         std::shared_ptr<SharedLibrary> ptr;
         {
           //TEMPORARY: to avoid possible deadlocks from ROOT, we must
           // take the lock ourselves
           R__LOCKGUARD2(gInterpreterMutex);
           try {
             ptr = std::make_shared<SharedLibrary>(p);
           } catch (cms::Exception& e) {
             e.addContext("While attempting to load plugin " + iPlugin);
             throw;
           }
         }
         loadables_.emplace(p, ptr);
         justLoaded_(*ptr);
         return *ptr;
       }
     }
     return *(itLoaded->second);
   }
 
   const SharedLibrary* PluginManager::tryToLoad(const std::string& iCategory, const std::string& iPlugin) {
     askedToLoadCategoryWithPlugin_(iCategory, iPlugin);
     bool ioThrowIfFailElseSucceedStatus = false;
     const std::filesystem::path& p = loadableFor_(iCategory, iPlugin, ioThrowIfFailElseSucceedStatus);
 
     if (not ioThrowIfFailElseSucceedStatus) {
       return nullptr;
     }
 
     //have we already loaded this?
     auto itLoaded = loadables_.find(p);
     if (itLoaded == loadables_.end()) {
       //Need to make sure we only have on SharedLibrary loading at a time
       std::lock_guard<std::recursive_mutex> guard(pluginLoadMutex());
       //Another thread may have gotten this while we were waiting on the mutex
       itLoaded = loadables_.find(p);
       if (itLoaded == loadables_.end()) {
         //try to make one
         goingToLoad_(p);
         Sentry s(loadingLibraryNamed_(), p.string());
         //std::filesystem::path native(p.string());
         std::shared_ptr<SharedLibrary> ptr;
         {
           //TEMPORARY: to avoid possible deadlocks from ROOT, we must
           // take the lock ourselves
           R__LOCKGUARD(gInterpreterMutex);
           try {
             ptr = std::make_shared<SharedLibrary>(p);
           } catch (cms::Exception& e) {
             e.addContext("While attempting to load plugin " + iPlugin);
             throw;
           }
         }
         loadables_[p] = ptr;
         justLoaded_(*ptr);
         return ptr.get();
       }
     }
     return (itLoaded->second).get();
   }
 
   //
   // static member functions
   //
   PluginManager* PluginManager::get() {
     PluginManager* manager = singleton();
     if (nullptr == manager) {
       throw cms::Exception("PluginManagerNotConfigured")
           << "PluginManager::get() was called before PluginManager::configure.";
     }
     return manager;
   }
 
   PluginManager& PluginManager::configure(const Config& iConfig) {
     PluginManager*& s = singleton();
     if (nullptr != s) {
       throw cms::Exception("PluginManagerReconfigured");
     }
 
     const Config& realConfig = iConfig;
     if (realConfig.searchPath().empty()) {
       throw cms::Exception("PluginManagerEmptySearchPath");
     }
     s = new PluginManager(realConfig);
     return *s;
   }
 
   const std::string& PluginManager::staticallyLinkedLoadingFileName() {
     static const std::string s_name("static");
     return s_name;
   }
 
   std::string& PluginManager::loadingLibraryNamed_() {
     //NOTE: pluginLoadMutex() indirectly guards this since this value
     // is only accessible via the Sentry call which us guarded by the mutex
     CMS_THREAD_SAFE static std::string s_name(staticallyLinkedLoadingFileName());
     return s_name;
   }
 
   PluginManager*& PluginManager::singleton() {
     CMS_THREAD_SAFE static PluginManager* s_singleton = nullptr;
     return s_singleton;
   }
 
   bool PluginManager::isAvailable() { return nullptr != singleton(); }
 
 }  // namespace edmplugin

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