/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2020 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * In addition, as a special exception, the copyright holders of this
 * program give permission to link the code of its release with the
 * OpenSSL project's "OpenSSL" library (or with modified versions of it
 * that use the same license as the "OpenSSL" library), and distribute
 * the linked executables. You must obey the GNU General Public License
 * in all respects for all of the code used other than "OpenSSL". If you
 * modify file(s) with this exception, you may extend this exception to
 * your version of the file(s), but you are not obligated to do so. If
 * you do not wish to do so, delete this exception statement from your
 * version. If you delete this exception statement from all source files
 * in the program, then also delete it here.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#include "PrecompiledHeadersServer.h"

#if defined(_WIN32)
// "Please include winsock2.h before windows.h"
#  include <winsock2.h>
#endif

#include "OrthancInitialization.h"

#include "../Core/DicomParsing/FromDcmtkBridge.h"
#include "../Core/FileStorage/FilesystemStorage.h"
#include "../Core/Logging.h"
#include "../Core/OrthancException.h"

#include "Database/SQLiteDatabaseWrapper.h"
#include "OrthancConfiguration.h"

#include <dcmtk/dcmnet/dul.h>   // For dcmDisableGethostbyaddr()



namespace Orthanc
{
  static void RegisterUserMetadata(const Json::Value& config)
  {
    if (config.isMember("UserMetadata"))
    {
      const Json::Value& parameter = config["UserMetadata"];

      Json::Value::Members members = parameter.getMemberNames();
      for (size_t i = 0; i < members.size(); i++)
      {
        const std::string& name = members[i];

        if (!parameter[name].isInt())
        {
          throw OrthancException(ErrorCode_BadParameterType,
                                 "Not a number in this user-defined metadata: " + name);
        }

        int metadata = parameter[name].asInt();        

        LOG(INFO) << "Registering user-defined metadata: " << name << " (index " 
                  << metadata << ")";

        try
        {
          RegisterUserMetadata(metadata, name);
        }
        catch (OrthancException&)
        {
          LOG(ERROR) << "Cannot register this user-defined metadata: " << name;
          throw;
        }
      }
    }
  }


  static void RegisterUserContentType(const Json::Value& config)
  {
    if (config.isMember("UserContentType"))
    {
      const Json::Value& parameter = config["UserContentType"];

      Json::Value::Members members = parameter.getMemberNames();
      for (size_t i = 0; i < members.size(); i++)
      {
        const std::string& name = members[i];
        std::string mime = MIME_BINARY;

        const Json::Value& value = parameter[name];
        int contentType;

        if (value.isArray() &&
            value.size() == 2 &&
            value[0].isInt() &&
            value[1].isString())
        {
          contentType = value[0].asInt();
          mime = value[1].asString();
        }
        else if (value.isInt())
        {
          contentType = value.asInt();
        }
        else
        {
          throw OrthancException(ErrorCode_BadParameterType,
                                 "Not a number in this user-defined attachment type: " + name);
        }

        LOG(INFO) << "Registering user-defined attachment type: " << name << " (index " 
                  << contentType << ") with MIME type \"" << mime << "\"";

        try
        {
          RegisterUserContentType(contentType, name, mime);
        }
        catch (OrthancException&)
        {
          throw;
        }
      }
    }
  }


  static void LoadCustomDictionary(const Json::Value& configuration)
  {
    if (configuration.type() != Json::objectValue ||
        !configuration.isMember("Dictionary") ||
        configuration["Dictionary"].type() != Json::objectValue)
    {
      return;
    }

    Json::Value::Members tags(configuration["Dictionary"].getMemberNames());

    for (Json::Value::ArrayIndex i = 0; i < tags.size(); i++)
    {
      const Json::Value& content = configuration["Dictionary"][tags[i]];
      if (content.type() != Json::arrayValue ||
          content.size() < 2 ||
          content.size() > 5 ||
          content[0].type() != Json::stringValue ||
          content[1].type() != Json::stringValue ||
          (content.size() >= 3 && content[2].type() != Json::intValue) ||
          (content.size() >= 4 && content[3].type() != Json::intValue) ||
          (content.size() >= 5 && content[4].type() != Json::stringValue))
      {
        throw OrthancException(ErrorCode_BadFileFormat, "The definition of the '" + tags[i] + "' dictionary entry is invalid.");
      }

      DicomTag tag(FromDcmtkBridge::ParseTag(tags[i]));
      ValueRepresentation vr = StringToValueRepresentation(content[0].asString(), true);
      std::string name = content[1].asString();
      unsigned int minMultiplicity = (content.size() >= 2) ? content[2].asUInt() : 1;
      unsigned int maxMultiplicity = (content.size() >= 3) ? content[3].asUInt() : 1;
      std::string privateCreator = (content.size() >= 4) ? content[4].asString() : "";

      FromDcmtkBridge::RegisterDictionaryTag(tag, vr, name, minMultiplicity, maxMultiplicity, privateCreator);
    }
  }


  static void ConfigurePkcs11(const Json::Value& config)
  {
    if (config.type() != Json::objectValue ||
        !config.isMember("Module") ||
        config["Module"].type() != Json::stringValue)
    {
      throw OrthancException(ErrorCode_BadFileFormat,
                             "No path to the PKCS#11 module (DLL or .so) is provided "
                             "for HTTPS client authentication");
    }

    std::string pin;
    if (config.isMember("Pin"))
    {
      if (config["Pin"].type() == Json::stringValue)
      {
        pin = config["Pin"].asString();
      }
      else
      {
        throw OrthancException(ErrorCode_BadFileFormat,
                               "The PIN number in the PKCS#11 configuration must be a string");
      }
    }

    bool verbose = false;
    if (config.isMember("Verbose"))
    {
      if (config["Verbose"].type() == Json::booleanValue)
      {
        verbose = config["Verbose"].asBool();
      }
      else
      {
        throw OrthancException(ErrorCode_BadFileFormat,
                               "The Verbose option in the PKCS#11 configuration must be a Boolean");
      }
    }

    HttpClient::InitializePkcs11(config["Module"].asString(), pin, verbose);
  }



  void OrthancInitialize(const char* configurationFile)
  {
    OrthancConfiguration::WriterLock lock;

    Toolbox::InitializeOpenSsl();

    InitializeServerEnumerations();

    // Read the user-provided configuration
    lock.GetConfiguration().Read(configurationFile);

    if (lock.GetJson().isMember("Locale"))
    {
      std::string locale = lock.GetConfiguration().GetStringParameter("Locale", "");
      Toolbox::InitializeGlobalLocale(lock.GetJson()["Locale"].asCString());
    }
    else
    {
      Toolbox::InitializeGlobalLocale(NULL);
    }

    if (lock.GetJson().isMember("DefaultEncoding"))
    {
      std::string encoding = lock.GetConfiguration().GetStringParameter("DefaultEncoding", "");
      SetDefaultDicomEncoding(StringToEncoding(encoding.c_str()));
    }
    else
    {
      SetDefaultDicomEncoding(ORTHANC_DEFAULT_DICOM_ENCODING);
    }

    if (lock.GetJson().isMember("Pkcs11"))
    {
      ConfigurePkcs11(lock.GetJson()["Pkcs11"]);
    }

    HttpClient::GlobalInitialize();

    RegisterUserMetadata(lock.GetJson());
    RegisterUserContentType(lock.GetJson());

    bool loadPrivate = lock.GetConfiguration().GetBooleanParameter("LoadPrivateDictionary", true);
    FromDcmtkBridge::InitializeDictionary(loadPrivate);
    LoadCustomDictionary(lock.GetJson());

    FromDcmtkBridge::InitializeCodecs();

    lock.GetConfiguration().RegisterFont(EmbeddedResources::FONT_UBUNTU_MONO_BOLD_16);

    /* Disable "gethostbyaddr" (which results in memory leaks) and use raw IP addresses */
    dcmDisableGethostbyaddr.set(OFTrue);
  }



  void OrthancFinalize()
  {
    OrthancConfiguration::WriterLock lock;

    HttpClient::GlobalFinalize();
    FromDcmtkBridge::FinalizeCodecs();
    Toolbox::FinalizeOpenSsl();
    Toolbox::FinalizeGlobalLocale();
  }


  static IDatabaseWrapper* CreateSQLiteWrapper()
  {
    OrthancConfiguration::ReaderLock lock;

    std::string storageDirectoryStr = 
      lock.GetConfiguration().GetStringParameter("StorageDirectory", "OrthancStorage");

    // Open the database
    boost::filesystem::path indexDirectory = lock.GetConfiguration().InterpretStringParameterAsPath(
      lock.GetConfiguration().GetStringParameter("IndexDirectory", storageDirectoryStr));

    LOG(WARNING) << "SQLite index directory: " << indexDirectory;

    try
    {
      boost::filesystem::create_directories(indexDirectory);
    }
    catch (boost::filesystem::filesystem_error&)
    {
    }

    return new SQLiteDatabaseWrapper(indexDirectory.string() + "/index");
  }


  namespace
  {
    // Anonymous namespace to avoid clashes between compilation modules

    class FilesystemStorageWithoutDicom : public IStorageArea
    {
    private:
      FilesystemStorage storage_;

    public:
      FilesystemStorageWithoutDicom(const std::string& path) : storage_(path)
      {
      }

      virtual void Create(const std::string& uuid,
                          const void* content, 
                          size_t size,
                          FileContentType type)
      {
        if (type != FileContentType_Dicom)
        {
          storage_.Create(uuid, content, size, type);
        }
      }

      virtual void Read(std::string& content,
                        const std::string& uuid,
                        FileContentType type)
      {
        if (type != FileContentType_Dicom)
        {
          storage_.Read(content, uuid, type);
        }
        else
        {
          throw OrthancException(ErrorCode_UnknownResource);
        }
      }

      virtual void Remove(const std::string& uuid,
                          FileContentType type) 
      {
        if (type != FileContentType_Dicom)
        {
          storage_.Remove(uuid, type);
        }
      }
    };
  }


  static IStorageArea* CreateFilesystemStorage()
  {
    OrthancConfiguration::ReaderLock lock;

    std::string storageDirectoryStr = 
      lock.GetConfiguration().GetStringParameter("StorageDirectory", "OrthancStorage");

    boost::filesystem::path storageDirectory = 
      lock.GetConfiguration().InterpretStringParameterAsPath(storageDirectoryStr);

    LOG(WARNING) << "Storage directory: " << storageDirectory;

    if (lock.GetConfiguration().GetBooleanParameter("StoreDicom", true))
    {
      return new FilesystemStorage(storageDirectory.string());
    }
    else
    {
      LOG(WARNING) << "The DICOM files will not be stored, Orthanc running in index-only mode";
      return new FilesystemStorageWithoutDicom(storageDirectory.string());
    }
  }


  IDatabaseWrapper* CreateDatabaseWrapper()
  {
    return CreateSQLiteWrapper();
  }


  IStorageArea* CreateStorageArea()
  {
    return CreateFilesystemStorage();
  }  
}