/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2006 Tatsuhiro Tsujikawa
 *
 * 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
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * 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.
 */
/* copyright --> */
#include "common.h"

#include <signal.h>
#include <unistd.h>
#include <getopt.h>

#include <deque>
#include <fstream>
#include <iostream>
#include <numeric>

#include "SharedHandle.h"
#include "LogFactory.h"
#include "Logger.h"
#include "Util.h"
#include "BitfieldManFactory.h"
#include "FeatureConfig.h"
#include "MultiUrlRequestInfo.h"
#include "SimpleRandomizer.h"
#include "File.h"
#include "message.h"
#include "prefs.h"
#include "Option.h"
#include "a2algo.h"
#include "a2io.h"
#include "a2time.h"
#include "Platform.h"
#include "DefaultBtContext.h"
#include "FileEntry.h"
#include "RequestGroup.h"
#include "ConsoleStatCalc.h"
#include "NullStatCalc.h"
#include "download_helper.h"
#include "Exception.h"
#include "ProtocolDetector.h"
#include "RecoverableException.h"
#include "SocketCore.h"
#ifdef ENABLE_METALINK
# include "MetalinkHelper.h"
# include "MetalinkEntry.h"
#endif // ENABLE_METALINK
#ifdef ENABLE_MESSAGE_DIGEST
# include "MessageDigestHelper.h"
#endif // ENABLE_MESSAGE_DIGEST

extern char* optarg;
extern int optind, opterr, optopt;

namespace aria2 {

// output stream to /dev/null
std::ofstream nullout(DEV_NULL);

SharedHandle<StatCalc> getStatCalc(const Option* op)
{
  SharedHandle<StatCalc> statCalc;
  if(op->getAsBool(PREF_QUIET)) {
    statCalc.reset(new NullStatCalc());
  } else {
    statCalc.reset(new ConsoleStatCalc(op->getAsInt(PREF_SUMMARY_INTERVAL)));
  }
  return statCalc;
}

std::ostream& getSummaryOut(const Option* op)
{
  if(op->getAsBool(PREF_QUIET)) {
    return nullout;
  } else {
    return std::cout;
  }
}

#ifdef ENABLE_BITTORRENT
static void showTorrentFile(const std::string& uri)
{
  SharedHandle<DefaultBtContext> btContext(new DefaultBtContext());
  btContext->load(uri);
  std::cout << btContext << std::endl;
}
#endif // ENABLE_BITTORRENT

#ifdef ENABLE_METALINK
static void showMetalinkFile(const std::string& uri, const Option* op)
{
  std::deque<SharedHandle<MetalinkEntry> > metalinkEntries;
  MetalinkHelper::parseAndQuery(metalinkEntries, uri, op);
  std::deque<SharedHandle<FileEntry> > fileEntries;
  MetalinkEntry::toFileEntry(fileEntries, metalinkEntries);
  Util::toStream(std::cout, fileEntries);
  std::cout << std::endl;
}
#endif // ENABLE_METALINK

#if defined ENABLE_BITTORRENT || defined ENABLE_METALINK
static void showFiles(const std::deque<std::string>& uris, const Option* op)
{
  ProtocolDetector dt;
  for(std::deque<std::string>::const_iterator i = uris.begin();
      i != uris.end(); ++i) {
    printf(">>> ");
    printf(MSG_SHOW_FILES, (*i).c_str());
    printf("\n");
    try {
#ifdef ENABLE_BITTORRENT
      if(dt.guessTorrentFile(*i)) {
	showTorrentFile(*i);
      } else
#endif // ENABLE_BITTORRENT
#ifdef ENABLE_METALINK
	if(dt.guessMetalinkFile(*i)) {
	  showMetalinkFile(*i, op);
	} else
#endif // ENABLE_METALINK
	  {
	    printf(MSG_NOT_TORRENT_METALINK);
	    printf("\n\n");
	  }
    } catch(RecoverableException& e) {
      std::cout << e.stackTrace() << std::endl;
    }
  }
}
#endif // ENABLE_BITTORRENT || ENABLE_METALINK

extern void option_processing(Option& option, std::deque<std::string>& uris,
			      int argc, char* const argv[]);

DownloadResult::RESULT main(int argc, char* argv[])
{
  std::deque<std::string> args;
  Option op;
  option_processing(op, args, argc, argv);

  SimpleRandomizer::init();
  BitfieldManFactory::setDefaultRandomizer(SimpleRandomizer::getInstance());
  if(op.get(PREF_LOG) == "-") {
    LogFactory::setLogFile(DEV_STDOUT);
  } else if(!op.get(PREF_LOG).empty()) {
    LogFactory::setLogFile(op.get(PREF_LOG));
  } else {
    LogFactory::setLogFile(DEV_NULL);
  }
  LogFactory::setLogLevel(op.get(PREF_LOG_LEVEL));
  if(op.getAsBool(PREF_QUIET)) {
    LogFactory::setConsoleOutput(false);
  }
#ifdef HAVE_EPOLL
  if(op.get(PREF_EVENT_POLL) == V_EPOLL) {
    SocketCore::useEpoll();
  } else
#endif // HAVE_EPOLL
    if(op.get(PREF_EVENT_POLL) == V_SELECT) {
      SocketCore::useSelect();
    }
  DownloadResult::RESULT exitStatus = DownloadResult::FINISHED;
  try {
    Logger* logger = LogFactory::getInstance();
    logger->info("<<--- --- --- ---");
    logger->info("  --- --- --- ---");
    logger->info("  --- --- --- --->>");
    logger->info("%s %s %s", PACKAGE, PACKAGE_VERSION, TARGET);
    logger->info(MSG_LOGGING_STARTED);

#ifdef ENABLE_MESSAGE_DIGEST
    MessageDigestHelper::staticSHA1DigestInit();
#endif // ENABLE_MESSAGE_DIGEST

#ifdef SIGPIPE
    Util::setGlobalSignalHandler(SIGPIPE, SIG_IGN, 0);
#endif
    std::deque<SharedHandle<RequestGroup> > requestGroups;
#ifdef ENABLE_BITTORRENT
    if(!op.blank(PREF_TORRENT_FILE)) {
      if(op.get(PREF_SHOW_FILES) == V_TRUE) {
	showTorrentFile(op.get(PREF_TORRENT_FILE));
	return exitStatus;
      } else {
	createRequestGroupForBitTorrent(requestGroups, &op, args);
      }
    }
    else
#endif // ENABLE_BITTORRENT
#ifdef ENABLE_METALINK
      if(!op.blank(PREF_METALINK_FILE)) {
	if(op.get(PREF_SHOW_FILES) == V_TRUE) {
	  showMetalinkFile(op.get(PREF_METALINK_FILE), &op);
	  return exitStatus;
	} else {
	  createRequestGroupForMetalink(requestGroups, &op);
	}
      }
      else
#endif // ENABLE_METALINK
	if(!op.blank(PREF_INPUT_FILE)) {
	  createRequestGroupForUriList(requestGroups, &op);
#if defined ENABLE_BITTORRENT || defined ENABLE_METALINK
	} else if(op.get(PREF_SHOW_FILES) == V_TRUE) {
	  showFiles(args, &op);
#endif // ENABLE_METALINK || ENABLE_METALINK
	} else {
	  createRequestGroupForUri(requestGroups, &op, args);
	}

    if(requestGroups.empty()) {
      std::cout << MSG_NO_FILES_TO_DOWNLOAD << std::endl;
    } else {
      exitStatus = MultiUrlRequestInfo(requestGroups, &op, getStatCalc(&op),
				       getSummaryOut(&op)).execute();
    }
  } catch(Exception& ex) {
    std::cerr << EX_EXCEPTION_CAUGHT << "\n" << ex.stackTrace() << std::endl;
    exitStatus = DownloadResult::UNKNOWN_ERROR;
  }
  LogFactory::release();
  return exitStatus;
}

} // namespace aria2

int main(int argc, char* argv[]) {
  aria2::Platform platform;

  aria2::DownloadResult::RESULT r = aria2::main(argc, argv);

  return r;
}
