#include "wanda/environment.hpp"

#include <string>

namespace wanda
{
  environment::environment(char const * const * env)
  {
    if (!env)
    {
      return;
    }

    std::string buffer{};
    for (; *env != nullptr; ++env)
    {
      buffer = *env;
      int split_point = buffer.find('=');
      if (split_point != std::string::npos)
      {
        m_cache[buffer.substr(0, split_point)] = buffer.substr(split_point + 1);
      }
    }
  }

  std::string & environment::operator[](std::string const & variable)
  {
    return m_cache[variable];
  }

  std::string const & environment::operator[](std::string const & variable) const
  {
    static std::string const empty{};
    if (auto needle = m_cache.find(variable); needle != cend())
    {
      return needle->second;
    }
    return empty;
  }

  environment::iterator environment::begin()
  {
    return m_cache.begin();
  }

  environment::const_iterator environment::begin() const
  {
    return m_cache.begin();
  }

  environment::const_iterator environment::cbegin() const
  {
    return m_cache.cbegin();
  }

  environment::iterator environment::end()
  {
    return m_cache.end();
  }

  environment::const_iterator environment::end() const
  {
    return m_cache.end();
  }

  environment::const_iterator environment::cend() const
  {
    return m_cache.cend();
  }

}  // namespace wanda