/*
 * Hash.h
 *
 * Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MAD_COMMON_HASH_H_
#define MAD_COMMON_HASH_H_

#include "export.h"

#include <Core/Exception.h>

#include <map>
#include <string>
#include <vector>

#include <boost/algorithm/string/case_conv.hpp>
#include <boost/cstdint.hpp>

namespace Mad {
namespace Common {

class MAD_COMMON_EXPORT Hash {
  private:
    Hash();

    class MAD_COMMON_EXPORT Hashes {
      private:
        std::map<Core::String, unsigned int> map;
        std::vector<Core::String> list;

        void addHash(const Core::String &name, unsigned id) {
          Core::String lowerName = name;
          lowerName.toLower();

          map.insert(std::make_pair(lowerName, id));
          list.push_back(name);
        }

      public:
        const std::vector<Core::String>& getList() const {
          return list;
        }

        const std::map<Core::String, unsigned int>& getMap() const {
          return map;
        }

        Hashes();
    };

    static const Hashes hashes;

  public:
    static const std::vector<Core::String>& getHashList() {
      return hashes.getList();
    }

    static bool isHashSupported(const Core::String &method) {
      Core::String lowerMethod = method;
      lowerMethod.toLower();

      return (hashes.getMap().find(lowerMethod) != hashes.getMap().end());
    }

    static std::vector<boost::uint8_t> hash(const std::vector<boost::uint8_t> &in, unsigned int method) throw (Core::Exception);

    static std::vector<boost::uint8_t> hash(const std::vector<boost::uint8_t> &in, const Core::String &method) throw (Core::Exception) {
      Core::String lowerMethod = method;
      lowerMethod.toLower();

      std::map<Core::String, unsigned int>::const_iterator methodIt = hashes.getMap().find(lowerMethod);
      if(methodIt == hashes.getMap().end())
        throw(Core::Exception(Core::Exception::NOT_IMPLEMENTED));

      return hash(in, methodIt->second);
    }

    static std::vector<boost::uint8_t> hash(const Core::String &in, unsigned int method) throw (Core::Exception) {
      std::string str = in.toUTF8();
      return hash(std::vector<boost::uint8_t>(str.begin(), str.end()), method);
    }

    static std::vector<boost::uint8_t> hash(const Core::String &in, const Core::String &method) throw (Core::Exception) {
      std::string str = in.toUTF8();
      return hash(std::vector<boost::uint8_t>(str.begin(), str.end()), method);
    }
};

}
}

#endif /* MAD_COMMON_HASH_H_ */