/* <!-- 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 "MetalinkEntry.h"

#include <algorithm>

#include "MetalinkResource.h"
#include "MetalinkMetaurl.h"
#include "FileEntry.h"
#include "util.h"
#include "a2functional.h"
#ifdef ENABLE_MESSAGE_DIGEST
# include "Checksum.h"
# include "ChunkChecksum.h"
#endif // ENABLE_MESSAGE_DIGEST
#include "Signature.h"
#include "SimpleRandomizer.h"

namespace aria2 {

MetalinkEntry::MetalinkEntry():
  sizeKnown(false),
  maxConnections(-1)
{}

MetalinkEntry::~MetalinkEntry() {}

namespace {
class AddLocationPriority {
private:
  std::vector<std::string> locations_;
  int priorityToAdd_;
public:
  AddLocationPriority
  (const std::vector<std::string>& locations, int priorityToAdd):
    locations_(locations), priorityToAdd_(priorityToAdd)
  {
    std::sort(locations_.begin(), locations_.end());
  }

  void operator()(SharedHandle<MetalinkResource>& res) {
    if(std::binary_search
       (locations_.begin(), locations_.end(), res->location)) {
      res->priority += priorityToAdd_;
    }
  }
};
} // namespace

MetalinkEntry& MetalinkEntry::operator=(const MetalinkEntry& metalinkEntry)
{
  if(this != &metalinkEntry) {
    this->file = metalinkEntry.file;
    this->version = metalinkEntry.version;
    this->languages = metalinkEntry.languages;
    this->oses = metalinkEntry.oses;
    this->maxConnections = metalinkEntry.maxConnections;
#ifdef ENABLE_MESSAGE_DIGEST
    this->checksum = metalinkEntry.checksum;
    this->chunkChecksum = metalinkEntry.chunkChecksum;
#endif // ENABLE_MESSAGE_DIGEST
    this->signature_ = metalinkEntry.signature_;
  }
  return *this;
}

const std::string& MetalinkEntry::getPath() const
{
  return file->getPath();
}

int64_t MetalinkEntry::getLength() const
{
  return file->getLength();
}

void MetalinkEntry::setLocationPriority
(const std::vector<std::string>& locations, int priorityToAdd)
{
  std::for_each(resources.begin(), resources.end(),
                AddLocationPriority(locations, priorityToAdd));
}

namespace {
class AddProtocolPriority {
private:
  std::string protocol_;
  int priorityToAdd_;
public:
  AddProtocolPriority(const std::string& protocol, int prefToAdd):
    protocol_(protocol), priorityToAdd_(prefToAdd) {}

  void operator()(const SharedHandle<MetalinkResource>& res) const
  {
    if(protocol_ == MetalinkResource::getTypeString(res->type)) {
      res->priority += priorityToAdd_;
    }
  }
};
} // namespace

void MetalinkEntry::setProtocolPriority(const std::string& protocol,
                                          int priorityToAdd)
{
  std::for_each(resources.begin(), resources.end(),
                AddProtocolPriority(protocol, priorityToAdd));
}

namespace {
template<typename T>
class PriorityHigher {
public:
  bool operator()(const SharedHandle<T>& res1,
                  const SharedHandle<T>& res2)
  {
    return res1->priority < res2->priority;
  }
};
} // namespace

void MetalinkEntry::reorderResourcesByPriority() {
  std::random_shuffle(resources.begin(), resources.end(),
                      *(SimpleRandomizer::getInstance().get()));
  std::sort(resources.begin(), resources.end(),
            PriorityHigher<MetalinkResource>());
}

void MetalinkEntry::reorderMetaurlsByPriority()
{
  std::sort(metaurls.begin(), metaurls.end(),PriorityHigher<MetalinkMetaurl>());
}

namespace {
class Supported:public std::unary_function<SharedHandle<MetalinkResource>, bool> {
public:
  bool operator()(const SharedHandle<MetalinkResource>& res) const
  {
    switch(res->type) {
    case MetalinkResource::TYPE_FTP:
    case MetalinkResource::TYPE_HTTP:
#ifdef ENABLE_SSL
    case MetalinkResource::TYPE_HTTPS:
#endif // ENABLE_SSL
#ifdef ENABLE_BITTORRENT
    case MetalinkResource::TYPE_BITTORRENT:
#endif // ENABLE_BITTORRENT
      return true;
    default:
      return false;
    }
  }
};
} // namespace

void MetalinkEntry::dropUnsupportedResource() {
  resources.erase(std::remove_if(resources.begin(), resources.end(),
                                 std::not1(Supported())),
                  resources.end());
}

void MetalinkEntry::toFileEntry
(std::vector<SharedHandle<FileEntry> >& fileEntries,
 const std::vector<SharedHandle<MetalinkEntry> >& metalinkEntries)
{
  std::transform(metalinkEntries.begin(), metalinkEntries.end(),
                 std::back_inserter(fileEntries),
                 mem_fun_sh(&MetalinkEntry::getFile));
}

void MetalinkEntry::setSignature(const SharedHandle<Signature>& signature)
{
  signature_ = signature;
}

bool MetalinkEntry::containsLanguage(const std::string& lang) const
{
  return std::find(languages.begin(), languages.end(), lang) != languages.end();
}

bool MetalinkEntry::containsOS(const std::string& os) const
{
  return std::find(oses.begin(), oses.end(), os) != oses.end();
}

} // namespace aria2