text: #include <irc/irc_channel.hpp>
  #include <algorithm>
  
  void IrcChannel::set_self(IrcUser* user)
  {
    this->self = user;
  }
  
  IrcUser* IrcChannel::add_user(const std::string& name,
                                const std::map<char, char>& prefix_to_mode)
  {
    auto new_user = std::make_unique<IrcUser>(name, prefix_to_mode);
    auto old_user = this->find_user(new_user->nick);
    if (old_user)
      return old_user;
    this->users.emplace_back(std::move(new_user));
    return this->users.back().get();
  }
  
  IrcUser* IrcChannel::get_self() const
  {
    return this->self;
  }
  
  IrcUser* IrcChannel::find_user(const std::string& name) const
  {
    IrcUser user(name);
    for (const auto& u: this->users)
      {
        if (u->nick == user.nick)
          return u.get();
      }
    return nullptr;
  }
  
  std::unique_ptr<IrcUser> IrcChannel::remove_user(const IrcUser* user)
  {
    std::unique_ptr<IrcUser> result{};
    const auto nick = user->nick;
    const bool is_self = (user == this->self);
    const auto it = std::find_if(this->users.begin(), this->users.end(),
                                 [nick](const std::unique_ptr<IrcUser>& u)
                                 {
                                   return nick == u->nick;
                                 });
    if (it != this->users.end())
      {
        result = std::move(*it);
        this->users.erase(it);
        if (is_self)
          {
            this->self = nullptr;
            this->joined = false;
          }
      }
    return result;
  }
  