// src/backend/plugin_manager.cc - Copyright 2005, 2006, University
//               of Padova, dept. of Pure and Applied
//               Mathematics
//
// This file is part of SGPEMv2.
//
// This 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 2 of the License, or
// (at your option) any later version.
//
// SGPEMv2 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 SGPEMv2; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

#include "config.h"

#include "plugin_manager.hh"
#include "module.hh"
#include "global_preferences.hh"

#include "singleton.tcc"

#include <glibmm/fileutils.h>
#include <glibmm/pattern.h>

#include <iostream>

using namespace sgpem;
using namespace std;

template class SG_DLLEXPORT Singleton<PluginManager>;


std::vector<Module*> 
PluginManager::get_module_list() const
{
  return _modules;
}

void 
PluginManager::rescan_dirs()
{  
  Module* module = NULL;

  for_each(_modules.begin(), _modules.end(), ptr_fun(operator delete));
  _modules.clear();
  
  GlobalPreferences& prefs = GlobalPreferences::get_instance();
  GlobalPreferences::dir_iterator it = prefs.modules_dir_begin();

  Glib::PatternSpec shared_obj("*.so");
  
  while(it != prefs.modules_dir_end())
  {
    Glib::Dir dir(*it);

    for(Glib::DirIterator dir_it = dir.begin(); dir_it != dir.end(); ++dir_it)
    {
      // only attempt to load .so files
      if(shared_obj.match(*dir_it))
      {
	std::string module_path = Module::build_path(*it, *dir_it);

	std::cout << "Attempting to load module at path " << module_path << std::endl;
	
	try
	{
	  module = new Module(module_path);

	  if(*module) 
	  {
	    _modules.push_back(module);
	    std::cerr << "\tSuccess" << std::endl;
	  }
	  else 
	  { 
	    std::cerr << "\tFailed: " << Glib::Module::get_last_error() << std::endl;
	    delete module;
	  }

	}
	catch(InvalidPluginException e)
	{
	  std::cerr << "\tFailed, invalid plugin: " << e.what() << std::endl;
	}
      }
    }
    
    it++;
  }
}

PluginManager::PluginManager()
{
  rescan_dirs();
}