/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, 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.
 * 
 * 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 <orthanc/OrthancCPlugin.h>

#include <string.h>
#include <stdio.h>
#include <string>

static OrthancPluginContext* context = NULL;


static std::string GetPath(const char* uuid)
{
  return "plugin_" + std::string(uuid);
}


static int32_t StorageCreate(const char* uuid,
                             const void* content,
                             int64_t size,
                             OrthancPluginContentType type)
{
  std::string path = GetPath(uuid);

  FILE* fp = fopen(path.c_str(), "wb");
  if (!fp)
  {
    return -1;
  }

  bool ok = fwrite(content, size, 1, fp) == 1;
  fclose(fp);

  return ok ? 0 : -1;
}


static int32_t StorageRead(void** content,
                           int64_t* size,
                           const char* uuid,
                           OrthancPluginContentType type)
{
  std::string path = GetPath(uuid);

  FILE* fp = fopen(path.c_str(), "rb");
  if (!fp)
  {
    return -1;
  }

  if (fseek(fp, 0, SEEK_END) < 0)
  {
    fclose(fp);
    return -1;
  }

  *size = ftell(fp);

  if (fseek(fp, 0, SEEK_SET) < 0)
  {
    fclose(fp);
    return -1;
  }

  bool ok = true;

  if (*size == 0)
  {
    *content = NULL;
  }
  else
  {
    *content = malloc(*size);
    if (*content == NULL ||
        fread(*content, *size, 1, fp) != 1)
    {
      ok = false;
    }
  }

  fclose(fp);

  return ok ? 0 : -1;  
}


static int32_t StorageRemove(const char* uuid,
                             OrthancPluginContentType type)
{
  std::string path = GetPath(uuid);
  return remove(path.c_str());
}


extern "C"
{
  ORTHANC_PLUGINS_API int32_t OrthancPluginInitialize(OrthancPluginContext* c)
  {
    context = c;
    OrthancPluginLogWarning(context, "Storage plugin is initializing");

    /* Check the version of the Orthanc core */
    if (OrthancPluginCheckVersion(c) == 0)
    {
      char info[1024];
      sprintf(info, "Your version of Orthanc (%s) must be above %d.%d.%d to run this plugin",
              c->orthancVersion,
              ORTHANC_PLUGINS_MINIMAL_MAJOR_NUMBER,
              ORTHANC_PLUGINS_MINIMAL_MINOR_NUMBER,
              ORTHANC_PLUGINS_MINIMAL_REVISION_NUMBER);
      OrthancPluginLogError(context, info);
      return -1;
    }

    OrthancPluginRegisterStorageArea(context, StorageCreate, StorageRead, StorageRemove);

    return 0;
  }


  ORTHANC_PLUGINS_API void OrthancPluginFinalize()
  {
    OrthancPluginLogWarning(context, "Storage plugin is finalizing");
  }


  ORTHANC_PLUGINS_API const char* OrthancPluginGetName()
  {
    return "storage";
  }


  ORTHANC_PLUGINS_API const char* OrthancPluginGetVersion()
  {
    return "1.0";
  }
}