/**
 *  The login information to access a server
 *
 *  This class combines login, password and vhost
 *
 *  @copyright 2014 - 2018 Copernica BV
 */

/**
 *  Include guard
 */
#pragma once

/**
 *  Dependencies
 */
#include <string>

/**
 *  Set up namespace
 */
namespace AMQP {

/**
 *  Class definition
 */
class Login
{
private:
    /**
     *  The username
     *  @var string
     */
    std::string _user;

    /**
     *  The password
     *  @var string
     */
    std::string _password;


public:
    /**
     *  Default constructor
     */
    Login() : _user("guest"), _password("guest") {}

    /**
     *  Constructor
     *  @param  user
     *  @param  password
     */
    Login(std::string user, std::string password) :
        _user(std::move(user)), _password(std::move(password)) {}

    /**
     *  Constructor
     *  @param  user
     *  @param  password
     */
    Login(const char *user, const char *password) :
        _user(user), _password(password) {}

    /**
     *  Destructor
     */
    virtual ~Login() = default;
    
    /**
     *  Cast to boolean: is the login set?
     *  @return bool
     */
    operator bool () const
    {
        return !_user.empty() || !_password.empty();
    }
    
    /**
     *  Negate operator: is it not set
     *  @return bool
     */
    bool operator! () const
    {
        return _user.empty() && _password.empty();
    }

    /**
     *  Retrieve the user name
     *  @return string
     */
    const std::string &user() const
    {
        return _user;
    }

    /**
     *  Retrieve the password
     *  @return string
     */
    const std::string &password() const
    {
        return _password;
    }

    /**
     *  String representation in SASL PLAIN mode
     *  @return string
     */
    std::string saslPlain() const
    {
        // we need an initial string
        std::string result("\0", 1);

        // append other elements
        return result.append(_user).append("\0",1).append(_password);
    }
    
    /**
     *  Comparison operator
     *  @param  that
     *  @return bool
     */
    bool operator==(const Login &that) const
    {
        // username and password must match
        return _user == that._user && _password == that._password;
    }

    /**
     *  Comparison operator
     *  @param  that
     *  @return bool
     */
    bool operator!=(const Login &that) const
    {
        // the opposite of operator==
        return !operator==(that);
    }
    
    /**
     *  Comparison operator
     *  @param  that
     *  @return bool
     */
    bool operator<(const Login &that) const
    {
        // compare users
        if (_user != that._user) return _user < that._user;
        
        // compare passwords
        return _password < that._password;
    }

    /**
     *  Friend function to allow writing the login to a stream
     *  @param  stream
     *  @param  login
     *  @return std::ostream
     */
    friend std::ostream &operator<<(std::ostream &stream, const Login &login)
    {
        // write username and password
        return stream << login._user << ":" << login._password;
    }

};

/**
 *  End of namespace
 */
}