/* <!-- 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 "MultiUrlRequestInfo.h"

#include <signal.h>

#include <cstring>
#include <ostream>

#include "RequestGroupMan.h"
#include "DownloadEngine.h"
#include "LogFactory.h"
#include "Logger.h"
#include "RequestGroup.h"
#include "prefs.h"
#include "DownloadEngineFactory.h"
#include "RecoverableException.h"
#include "message.h"
#include "util.h"
#include "Option.h"
#include "ConsoleStatCalc.h"
#include "NullStatCalc.h"
#include "CookieStorage.h"
#include "File.h"
#include "Netrc.h"
#include "AuthConfigFactory.h"
#include "SessionSerializer.h"
#include "TimeA2.h"
#include "fmt.h"
#include "SocketCore.h"
#include "NullOutputFile.h"
#include "UriListParser.h"
#include "SingletonHolder.h"
#include "Notifier.h"
#include "console.h"
#ifdef ENABLE_WEBSOCKET
#  include "WebSocketSessionMan.h"
#else // !ENABLE_WEBSOCKET
#  include "NullWebSocketSessionMan.h"
#endif // !ENABLE_WEBSOCKET
#ifdef ENABLE_SSL
#  include "TLSContext.h"
#endif // ENABLE_SSL
#ifdef ENABLE_ASYNC_DNS
#  include "AsyncNameResolver.h"
#endif // ENABLE_ASYNC_DNS

namespace aria2 {

namespace global {

extern volatile sig_atomic_t globalHaltRequested;

} // namespace global

namespace {

#ifdef _WIN32
static const DWORD mainThread = GetCurrentThreadId();
#endif

static void handler(int signal)
{
  if (
#ifdef SIGHUP
      signal == SIGHUP ||
#endif // SIGHUP
      signal == SIGTERM) {
    if (global::globalHaltRequested <= 2) {
      global::globalHaltRequested = 3;
    }
#ifdef _WIN32
    if (::GetCurrentThreadId() != mainThread) {
      // SIGTERM may arrive on another thread (via SetConsoleCtrlHandler), and
      // the process will be forcefully terminated as soon as that thread is
      // done. So better make sure it isn't done prematurely. ;)
      while (global::globalHaltRequested != 5) {
        ::Sleep(100); // Yeah, semi-busy waiting for now.
      }
    }
#endif
    return;
  }

  // SIGINT

  if (global::globalHaltRequested == 0) {
    global::globalHaltRequested = 1;
    return;
  }

  if (global::globalHaltRequested == 2) {
    global::globalHaltRequested = 3;
    return;
  }
}
} // namespace

namespace {

std::unique_ptr<StatCalc> getStatCalc(const std::shared_ptr<Option>& op)
{
  if (op->getAsBool(PREF_QUIET)) {
    return make_unique<NullStatCalc>();
  }
  auto impl = make_unique<ConsoleStatCalc>(
      std::chrono::seconds(op->getAsInt(PREF_SUMMARY_INTERVAL)),
      op->getAsBool(PREF_ENABLE_COLOR), op->getAsBool(PREF_HUMAN_READABLE));
  impl->setReadoutVisibility(op->getAsBool(PREF_SHOW_CONSOLE_READOUT));
  impl->setTruncate(op->getAsBool(PREF_TRUNCATE_CONSOLE_READOUT));
  return std::move(impl);
}

} // namespace

MultiUrlRequestInfo::MultiUrlRequestInfo(
    std::vector<std::shared_ptr<RequestGroup>> requestGroups,
    const std::shared_ptr<Option>& op,
    const std::shared_ptr<UriListParser>& uriListParser)
    : requestGroups_(std::move(requestGroups)),
      option_(op),
      uriListParser_(uriListParser),
      useSignalHandler_(true)
{
#ifdef HAVE_SIGACTION
  sigemptyset(&mask_);
#else  // !HAVE_SIGACTION
  mask_ = 0;
#endif // !HAVE_SIGACTION
}

MultiUrlRequestInfo::~MultiUrlRequestInfo() = default;

void MultiUrlRequestInfo::printMessageForContinue()
{
  if (!option_->getAsBool(PREF_QUIET)) {
    global::cout()->printf(
        "\n%s\n%s\n",
        _("aria2 will resume download if the transfer is restarted."),
        _("If there are any errors, then see the log file. See '-l' option in "
          "help/man page for details."));
  }
}

int MultiUrlRequestInfo::prepare()
{
  global::globalHaltRequested = 0;
  try {
    SingletonHolder<Notifier>::instance(make_unique<Notifier>());

#ifdef ENABLE_SSL
    if (option_->getAsBool(PREF_ENABLE_RPC) &&
        option_->getAsBool(PREF_RPC_SECURE)) {
      if (option_->blank(PREF_RPC_CERTIFICATE)) {
        throw DL_ABORT_EX("Specify --rpc-certificate and --rpc-private-key "
                          "options in order to use secure RPC.");
      }
      // We set server TLS context to the SocketCore before creating
      // DownloadEngine instance.
      auto minTLSVer = util::toTLSVersion(option_->get(PREF_MIN_TLS_VERSION));
      std::shared_ptr<TLSContext> svTlsContext(
          TLSContext::make(TLS_SERVER, minTLSVer));
      if (!svTlsContext->addCredentialFile(
              option_->get(PREF_RPC_CERTIFICATE),
              option_->get(PREF_RPC_PRIVATE_KEY))) {
        throw DL_ABORT_EX("Loading private key and/or certificate for secure "
                          "RPC failed.");
      }
      SocketCore::setServerTLSContext(svTlsContext);
    }
#endif // ENABLE_SSL

    // RequestGroups will be transferred to DownloadEngine
    e_ = DownloadEngineFactory().newDownloadEngine(option_.get(),
                                                   std::move(requestGroups_));

#ifdef ENABLE_WEBSOCKET
    if (option_->getAsBool(PREF_ENABLE_RPC)) {
      e_->setWebSocketSessionMan(make_unique<rpc::WebSocketSessionMan>());
      SingletonHolder<Notifier>::instance()->addDownloadEventListener(
          e_->getWebSocketSessionMan().get());
    }
#endif // ENABLE_WEBSOCKET

    if (!option_->blank(PREF_LOAD_COOKIES)) {
      File cookieFile(option_->get(PREF_LOAD_COOKIES));
      if (cookieFile.isFile() &&
          e_->getCookieStorage()->load(cookieFile.getPath(),
                                       Time().getTimeFromEpoch())) {
        A2_LOG_INFO(
            fmt("Loaded cookies from '%s'.", cookieFile.getPath().c_str()));
      }
      else {
        A2_LOG_ERROR(
            fmt(MSG_LOADING_COOKIE_FAILED, cookieFile.getPath().c_str()));
      }
    }

    auto authConfigFactory = make_unique<AuthConfigFactory>();
    File netrccf(option_->get(PREF_NETRC_PATH));
    if (!option_->getAsBool(PREF_NO_NETRC) && netrccf.isFile()) {
#ifdef __MINGW32__
      // Windows OS does not have permission, so set it to 0.
      mode_t mode = 0;
#else  // !__MINGW32__
      mode_t mode = netrccf.mode();
#endif // !__MINGW32__
      if (mode & (S_IRWXG | S_IRWXO)) {
        A2_LOG_NOTICE(fmt(MSG_INCORRECT_NETRC_PERMISSION,
                          option_->get(PREF_NETRC_PATH).c_str()));
      }
      else {
        auto netrc = make_unique<Netrc>();
        netrc->parse(option_->get(PREF_NETRC_PATH));
        authConfigFactory->setNetrc(std::move(netrc));
      }
    }
    e_->setAuthConfigFactory(std::move(authConfigFactory));

#ifdef ENABLE_SSL
    auto minTLSVer = util::toTLSVersion(option_->get(PREF_MIN_TLS_VERSION));
    std::shared_ptr<TLSContext> clTlsContext(
        TLSContext::make(TLS_CLIENT, minTLSVer));
    if (!option_->blank(PREF_CERTIFICATE)) {
      clTlsContext->addCredentialFile(option_->get(PREF_CERTIFICATE),
                                      option_->get(PREF_PRIVATE_KEY));
    }

    if (!option_->blank(PREF_CA_CERTIFICATE)) {
      if (!clTlsContext->addTrustedCACertFile(
              option_->get(PREF_CA_CERTIFICATE))) {
        A2_LOG_INFO(MSG_WARN_NO_CA_CERT);
      }
    }
    else if (option_->getAsBool(PREF_CHECK_CERTIFICATE)) {
      if (!clTlsContext->addSystemTrustedCACerts()) {
        A2_LOG_INFO(MSG_WARN_NO_CA_CERT);
      }
    }
    clTlsContext->setVerifyPeer(option_->getAsBool(PREF_CHECK_CERTIFICATE));
    SocketCore::setClientTLSContext(clTlsContext);
#endif

    std::string serverStatIf = option_->get(PREF_SERVER_STAT_IF);
    if (!serverStatIf.empty()) {
      e_->getRequestGroupMan()->loadServerStat(serverStatIf);
      e_->getRequestGroupMan()->removeStaleServerStat(
          std::chrono::seconds(option_->getAsInt(PREF_SERVER_STAT_TIMEOUT)));
    }
    e_->setStatCalc(getStatCalc(option_));
    if (uriListParser_) {
      e_->getRequestGroupMan()->setUriListParser(uriListParser_);
    }
    if (useSignalHandler_) {
      setupSignalHandlers();
    }
    e_->getRequestGroupMan()->getNetStat().downloadStart();
  }
  catch (RecoverableException& e) {
    A2_LOG_ERROR_EX(EX_EXCEPTION_CAUGHT, e);
    SingletonHolder<Notifier>::clear();
    if (useSignalHandler_) {
      resetSignalHandlers();
    }
    return -1;
  }
  return 0;
}

error_code::Value MultiUrlRequestInfo::getResult()
{
  error_code::Value returnValue = error_code::FINISHED;
  if (!option_->blank(PREF_SAVE_COOKIES)) {
    e_->getCookieStorage()->saveNsFormat(option_->get(PREF_SAVE_COOKIES));
  }

  const std::string& serverStatOf = option_->get(PREF_SERVER_STAT_OF);
  if (!serverStatOf.empty()) {
    e_->getRequestGroupMan()->saveServerStat(serverStatOf);
  }
  if (!option_->getAsBool(PREF_QUIET) &&
      option_->get(PREF_DOWNLOAD_RESULT) != A2_V_HIDE) {
    e_->getRequestGroupMan()->showDownloadResults(
        *global::cout(), option_->get(PREF_DOWNLOAD_RESULT) == A2_V_FULL);
    global::cout()->flush();
  }

  RequestGroupMan::DownloadStat s = e_->getRequestGroupMan()->getDownloadStat();
  if (!s.allCompleted()) {
    printMessageForContinue();
    if (s.getLastErrorResult() == error_code::FINISHED &&
        s.getInProgress() > 0) {
      returnValue = error_code::IN_PROGRESS;
    }
    else {
      returnValue = s.getLastErrorResult();
    }
  }
  SessionSerializer sessionSerializer{e_->getRequestGroupMan().get()};
  // TODO Add option: --save-session-status=error,inprogress,waiting
  if (!option_->blank(PREF_SAVE_SESSION)) {
    const std::string& filename = option_->get(PREF_SAVE_SESSION);
    if (sessionSerializer.save(filename)) {
      A2_LOG_NOTICE(
          fmt(_("Serialized session to '%s' successfully."), filename.c_str()));
    }
    else {
      A2_LOG_NOTICE(
          fmt(_("Failed to serialize session to '%s'."), filename.c_str()));
    }
  }
  SingletonHolder<Notifier>::clear();
  return returnValue;
}

error_code::Value MultiUrlRequestInfo::execute()
{
  if (prepare() != 0) {
    return error_code::UNKNOWN_ERROR;
  }
  // TODO Enclosed in try..catch block for just in case. Really need
  // this?
  try {
    e_->run();
  }
  catch (RecoverableException& e) {
    A2_LOG_ERROR_EX(EX_EXCEPTION_CAUGHT, e);
  }
  error_code::Value returnValue = getResult();
  if (useSignalHandler_) {
    resetSignalHandlers();
  }
  return returnValue;
}

void MultiUrlRequestInfo::setupSignalHandlers()
{
#ifdef HAVE_SIGACTION
  sigemptyset(&mask_);
#else  // !HAVE_SIGACTION
  mask_ = 0;
#endif // !HAVE_SIGACTION
#ifdef SIGPIPE
  util::setGlobalSignalHandler(SIGPIPE, &mask_, SIG_IGN, 0);
#endif // SIGPIPE
#ifdef SIGCHLD
  // Avoid to create zombie process when forked child processes are
  // died.
  util::setGlobalSignalHandler(SIGCHLD, &mask_, SIG_IGN, 0);
#endif // SIGCHILD

#ifdef HAVE_SIGACTION
  sigaddset(&mask_, SIGINT);
  sigaddset(&mask_, SIGTERM);
#  ifdef SIGHUP
  sigaddset(&mask_, SIGHUP);
#  endif // SIGHUP
#endif   // HAVE_SIGACTION

#ifdef SIGHUP
  util::setGlobalSignalHandler(SIGHUP, &mask_, handler, 0);
#endif // SIGHUP
  util::setGlobalSignalHandler(SIGINT, &mask_, handler, 0);
  util::setGlobalSignalHandler(SIGTERM, &mask_, handler, 0);
}

void MultiUrlRequestInfo::resetSignalHandlers()
{
#ifdef HAVE_SIGACTION
  sigemptyset(&mask_);
#endif // HAVE_SIGACTION
#ifdef SIGHUP
  util::setGlobalSignalHandler(SIGHUP, &mask_, SIG_DFL, 0);
#endif // SIGHUP
  util::setGlobalSignalHandler(SIGINT, &mask_, SIG_DFL, 0);
  util::setGlobalSignalHandler(SIGTERM, &mask_, SIG_DFL, 0);

#ifdef SIGCHLD
  util::setGlobalSignalHandler(SIGCHLD, &mask_, SIG_DFL, 0);
#endif // SIGCHILD
#ifdef SIGPIPE
  util::setGlobalSignalHandler(SIGPIPE, &mask_, SIG_DFL, 0);
#endif // SIGPIPE
}

const std::unique_ptr<DownloadEngine>&
MultiUrlRequestInfo::getDownloadEngine() const
{
  return e_;
}

} // namespace aria2
