/* <!-- 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 "Option.h"

#include <cstdlib>
#include <cstring>

#include "prefs.h"
#include "bitfield.h"

namespace aria2 {

Option::Option()
  : table_(option::countOption()),
    use_((option::countOption()+7)/8)
{}

Option::~Option() {}

Option::Option(const Option& option)
  : table_(option.table_),
    use_(option.use_),
    parent_(option.parent_)
{}

Option& Option::operator=(const Option& option)
{
  if(this != &option) {
    table_ = option.table_;
    use_ = option.use_;
    parent_ = option.parent_;
  }
  return *this;
}

namespace {

template<typename V>
void setBit(V& b, const Pref* pref)
{
  b[pref->i/8] |= 128 >> (pref->i%8);
}

template<typename V>
void unsetBit(V& b, const Pref* pref)
{
  b[pref->i/8] &= ~(128 >> (pref->i%8));
}

} // namespace

void Option::put(const Pref* pref, const std::string& value) {
  setBit(use_, pref);
  table_[pref->i] = value;
}

bool Option::defined(const Pref* pref) const
{
  return bitfield::test(use_, use_.size()*8, pref->i) ||
    (parent_ && parent_->defined(pref));
}

bool Option::definedLocal(const Pref* pref) const
{
  return bitfield::test(use_, use_.size()*8, pref->i);
}

bool Option::blank(const Pref* pref) const
{
  if(bitfield::test(use_, use_.size()*8, pref->i)) {
    return table_[pref->i].empty();
  } else {
    return !parent_ || parent_->blank(pref);
  }
}

const std::string& Option::get(const Pref* pref) const
{
  if(bitfield::test(use_, use_.size()*8, pref->i)) {
    return table_[pref->i];
  } else if(parent_) {
    return parent_->get(pref);
  } else {
    return A2STR::NIL;
  }
}

int32_t Option::getAsInt(const Pref* pref) const {
  const std::string& value = get(pref);
  if(value.empty()) {
    return 0;
  } else {
    return strtol(value.c_str(), 0, 10);
  }
}

int64_t Option::getAsLLInt(const Pref* pref) const {
  const std::string& value = get(pref);
  if(value.empty()) {
    return 0;
  } else {
    return strtoll(value.c_str(), 0, 10);
  }
}

bool Option::getAsBool(const Pref* pref) const {
  return get(pref) == A2_V_TRUE;
}

double Option::getAsDouble(const Pref* pref) const {
  const std::string& value = get(pref);
  if(value.empty()) {
    return 0.0;
  } else {
    return strtod(value.c_str(), 0);
  }
}

void Option::remove(const Pref* pref)
{
  unsetBit(use_, pref);
  table_[pref->i].clear();
}

void Option::clear()
{
  std::fill(use_.begin(), use_.end(), 0);
  std::fill(table_.begin(), table_.end(), "");
}

void Option::merge(const Option& option)
{
  size_t bits = option.use_.size()*8;
  for(size_t i = 1, len = table_.size(); i < len; ++i) {
    if(bitfield::test(option.use_, bits, i)) {
      use_[i/8] |= 128 >> (i%8);
      table_[i] = option.table_[i];
    }
  }
}

void Option::setParent(const std::shared_ptr<Option>& parent)
{
  parent_ = parent;
}

const std::shared_ptr<Option>& Option::getParent() const
{
  return parent_;
}

} // namespace aria2