#include "tpluginmanager.h"

#include "tsystem.h"

#include "tconvert.h"

#include "tlogger.h"

#ifdef _WIN32

#include <windows.h></windows.h>

#else

// QUALE DI QUESTI SERVE VERAMENTE??

#include <grp.h></grp.h>

#include <utime.h></utime.h>

#include <sys param.h=""></sys>

#include <unistd.h></unistd.h>

#include <sys types.h=""></sys>

#ifndef FREEBSD

#include <dirent.h></dirent.h>

#endif

#include <stdio.h></stdio.h>

#include <unistd.h></unistd.h>

#include <sys dir.h=""></sys>

#include <sys param.h="">  // for getfsstat</sys>

#ifdef MACOSX

#include <sys ucred.h=""></sys>

#endif

#include <sys mount.h=""></sys>

#include <pwd.h></pwd.h>

#include <dlfcn.h></dlfcn.h>

#endif

//-----------------------------------------------------------------------------

class TPluginManager::Plugin {

public:

#ifdef _WIN32

  typedef HINSTANCE Handle;

#else

  typedef void *Handle;

#endif

private:

  Handle m_handle;

  TPluginInfo m_info;

public:

  Plugin(Handle handle) : m_handle(handle) {}

  Handle getHandle() const { return m_handle; }

  const TPluginInfo &getInfo() const { return m_info; }

  void setInfo(const TPluginInfo &info) { m_info = info; }

  std::string getName() const { return m_info.getName(); }

};

//-----------------------------------------------------------------------------

typedef const TPluginInfo *TnzLibMainProcType();

//--------------------------------------------------------------

namespace {

const char *TnzLibMainProcName = "TLibMain";

#if !defined(_WIN32)

const char *TnzLibMainProcName2 = "_TLibMain";

#endif

}

//=============================================================================

TPluginManager::TPluginManager() { m_ignoreList.insert("tnzimagevector"); }

//-----------------------------------------------------------------------------

TPluginManager::~TPluginManager() {

  //   try { unloadPlugins(); } catch(...) {}

}

//-----------------------------------------------------------------------------

TPluginManager *TPluginManager::instance() {

  static TPluginManager _instance;

  return &_instance;

}

//-----------------------------------------------------------------------------

bool TPluginManager::isIgnored(std::string name) const {

  return m_ignoreList.count(toLower(name)) > 0;

}

//-----------------------------------------------------------------------------

void TPluginManager::unloadPlugins() {

  for (PluginTable::iterator it = m_pluginTable.begin();

       it != m_pluginTable.end(); ++it) {

    Plugin::Handle handle = (*it)->getHandle();

#if !(defined(LINUX) || defined(FREEBSD))

#ifdef _WIN32

    FreeLibrary(handle);

#else

    dlclose(handle);

#endif

#endif

    delete (*it);

  }

  m_pluginTable.clear();

}

//--------------------------------------------------------------

void TPluginManager::loadPlugin(const TFilePath &fp) {

  if ((int)m_loadedPlugins.count(fp) > 0) {

    TLogger::debug() << "Already loaded " << fp;

    return;

  }

  std::string name = fp.getName();

  if (isIgnored(name)) {

    TLogger::debug() << "Ignored " << fp;

    return;

  }

  TLogger::debug() << "Loading " << fp;

#ifdef _WIN32

  Plugin::Handle handle = LoadLibraryW(fp.getWideString().c_str());

#else

  Plugin::Handle handle =

      dlopen(::to_string(fp).c_str(), RTLD_NOW);  // RTLD_LAZY

#endif

  if (!handle) {

    // non riesce a caricare la libreria;

    TLogger::warning() << "Unable to load " << fp;

#ifdef _WIN32

    std::wstring getFormattedMessage(DWORD lastError);

    TLogger::warning() << ::to_string(getFormattedMessage(GetLastError()));

#else

    TLogger::warning() << dlerror();

#endif

  } else {

    m_loadedPlugins.insert(fp);

    Plugin *plugin = new Plugin(handle);

    m_pluginTable.push_back(plugin);

    // cout << "loaded" << endl;

    TnzLibMainProcType *tnzLibMain = 0;

#ifdef _WIN32

    tnzLibMain =

        (TnzLibMainProcType *)GetProcAddress(handle, TnzLibMainProcName);

#else

    tnzLibMain = (TnzLibMainProcType *)dlsym(handle, TnzLibMainProcName);

    if (!tnzLibMain)  // provo _ come prefisso

      tnzLibMain = (TnzLibMainProcType *)dlsym(handle, TnzLibMainProcName2);

#endif

    if (!tnzLibMain) {

      // La libreria non esporta TLibMain;

      TLogger::warning() << "Corrupted " << fp;

#ifdef _WIN32

      FreeLibrary(handle);

#else

      dlclose(handle);

#endif

    } else {

      const TPluginInfo *info = tnzLibMain();

      if (info) plugin->setInfo(*info);

    }

  }

}

//--------------------------------------------------------------

void TPluginManager::loadPlugins(const TFilePath &dir) {

#if defined(_WIN32)

  const std::string extension = "dll";

#elif defined(LINUX) || defined(FREEBSD) || defined(__sgi)

  const std::string extension = "so";

#elif defined(MACOSX)

  const std::string extension = "dylib";

#endif

  TFilePathSet dirContent = TSystem::readDirectory(dir, false);

  if (dirContent.empty()) return;

  for (TFilePathSet::iterator it = dirContent.begin(); it != dirContent.end();

       it++) {

    TFilePath fp = *it;

    if (fp.getType() != extension) continue;

    std::wstring fullpath = fp.getWideString();

#ifdef _WIN32

    bool isDebugLibrary =

        (fullpath.find(L".d.") == fullpath.size() - (extension.size() + 3));

#ifdef _DEBUG

    if (!isDebugLibrary)

#else

    if (isDebugLibrary)

#endif

      continue;

#endif

    try {

      loadPlugin(fp);

    } catch (...) {

      TLogger::warning() << "unexpected error loading " << fp;

    }

  }

}

//--------------------------------------------------------------

void TPluginManager::loadStandardPlugins() {

  TFilePath pluginsDir = TSystem::getDllDir() + "plugins";

  // loadPlugins(pluginsDir + "io");

  loadPlugins(pluginsDir + "fx");

}

//--------------------------------------------------------------

void TPluginManager::setIgnoredList(const std::set<std::string> &names) {</std::string>

  m_ignoreList.clear();

  for (std::set<std::string>::const_iterator it = names.begin();</std::string>

       it != names.end(); ++it)

    m_ignoreList.insert(toLower(*it));

}