// 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 2 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, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include <cstdio>

#include <simgear/misc/sg_path.hxx>
#include <simgear/xml/easyxml.hxx>
#include <simgear/misc/strutils.hxx>
#include <simgear/timing/timestamp.hxx>

#include <Main/globals.hxx>
#include <Main/fg_props.hxx>

#include "xmlloader.hxx"
#include "dynamicloader.hxx"
#include "runwayprefloader.hxx"

#include "dynamics.hxx"
#include "airport.hxx"
#include "runwayprefs.hxx"

#include <Navaids/NavDataCache.hxx>

using std::string;

XMLLoader::XMLLoader() {}
XMLLoader::~XMLLoader() {}

void XMLLoader::load(FGAirportDynamics* d)
{
  SGPath path;
  if (!findAirportData(d->parent()->ident(), "groundnet", path)) {
    return;
  }

  flightgear::NavDataCache* cache = flightgear::NavDataCache::instance();
  if (!cache->isCachedFileModified(path) || cache->isReadOnly()) {
    return;
  }
  
  SG_LOG(SG_NAVAID, SG_INFO, "reading groundnet data from " << path);
  SGTimeStamp t;
  try {
    flightgear::NavDataCache::Transaction txn(cache);
    t.stamp();
    {
      // drop all current data
      cache->dropGroundnetFor(d->parent()->guid());
      
      FGAirportDynamicsXMLLoader visitor(d);
      readXML(path.str(), visitor);
    } // ensure visitor is destroyed so its destructor runs
    cache->stampCacheFile(path);
    txn.commit();
  } catch (sg_exception& e) {
    SG_LOG(SG_NAVAID, SG_INFO, "parsing groundnet XML failed:" << e.getFormattedMessage());
  }

  SG_LOG(SG_NAVAID, SG_INFO, "parsing groundnet XML took " << t.elapsedMSec());
}

void XMLLoader::load(FGRunwayPreference* p) {
  FGRunwayPreferenceXMLLoader visitor(p);
  loadAirportXMLDataIntoVisitor(p->getId(), "rwyuse", visitor);
}

bool XMLLoader::findAirportData(const std::string& aICAO, 
    const std::string& aFileName, SGPath& aPath)
{
  string fileName(aFileName);
  if (!simgear::strutils::ends_with(aFileName, ".xml")) {
    fileName.append(".xml");
  }
  
  string_list sc = globals->get_fg_scenery();
  char buffer[128];
  ::snprintf(buffer, 128, "%c/%c/%c/%s.%s", 
    aICAO[0], aICAO[1], aICAO[2], 
    aICAO.c_str(), fileName.c_str());

  for (string_list_iterator it = sc.begin(); it != sc.end(); ++it) {
    // fg_senery contains empty strings as "markers" (see FGGlobals::set_fg_scenery)
    if (!it->empty()) {
        SGPath path(*it);
        path.append("Airports");
        path.append(string(buffer));
        if (path.exists()) {
          aPath = path;
          return true;
        } // of path exists
    }
  } // of scenery path iteration
  return false;
}

bool XMLLoader::loadAirportXMLDataIntoVisitor(const string& aICAO, 
    const string& aFileName, XMLVisitor& aVisitor)
{
  SGPath path;
  if (!findAirportData(aICAO, aFileName, path)) {
    SG_LOG(SG_NAVAID, SG_DEBUG, "loadAirportXMLDataIntoVisitor: failed to find data for " << aICAO << "/" << aFileName);
    return false;
  }

  SG_LOG(SG_GENERAL, SG_DEBUG, "loadAirportXMLDataIntoVisitor: loading from " << path.str());
  readXML(path.str(), aVisitor);
  return true;
}