#include <iostream>
#include <boost/algorithm/string/predicate.hpp>
#include "message.h"
#include "protocol.h"

protocol::protocol(const context& context) :
	m_internalState(internalState::none),
	m_context(context)
{
}

protocol::result protocol::openConnection(const std::string& address)
{
	m_address = address;
	m_internalState = internalState::connect;
	std::cout << "Connection from " << address << std::endl;
	return answer(protocol::state::connected, "220 AlarmServer");
}

protocol::result protocol::processMessage(const std::string& message)
{
	if (m_internalState == internalState::data)
	{
		appendMessage(message);

		if (boost::iends_with(message, ".\r\n"))
		{
			std::cout << "-> " << " . " << std::endl;
			::message msg(m_address, m_context, m_message);
			std::cout << "-> " << " . " << std::endl;
			m_internalState = internalState::helo;
			std::cout << "-> " << " . " << std::endl;
			return answer(protocol::state::connected, "250 Ok");
		}

		return answer(protocol::state::connected, "");
	}
	
	std::cout << "-> " << message << std::endl;

	if (m_internalState == internalState::auth_login_user)
	{
		m_internalState = internalState::auth_login_pass;
		return answer(protocol::state::connected, "334 UGFzc3dvcmQ6");
	}
	if (m_internalState == internalState::auth_login_pass)
	{
		m_internalState = internalState::helo;
		return answer(protocol::state::connected, "235 2.7.0 Authentication successful");
	}

	if (boost::iequals(message, "quit\r\n"))
	{
		m_internalState = internalState::disconnect;
		return answer(protocol::state::disconnected, "221 Bye");
	}
	if (boost::istarts_with(message, "helo"))
	{
		m_internalState = internalState::helo;
		return answer(protocol::state::connected, "250-AlarmServer\r\n250 AUTH LOGIN");
	}
	if (boost::istarts_with(message, "ehlo"))
	{
		m_internalState = internalState::helo;
		return answer(protocol::state::connected, "250-AlarmServer\r\n250 AUTH LOGIN");
	}
	if (boost::istarts_with(message, "auth login"))
	{
		if (m_internalState != internalState::helo)
			return answer(protocol::state::connected, "503 Bad sequence of commands");
		m_internalState = internalState::auth_login_user;
		return answer(protocol::state::connected, "334 VXNlcm5hbWU6");
	}
	if (boost::istarts_with(message, "mail from:"))
	{
		if (m_internalState != internalState::helo)
			return answer(protocol::state::connected, "503 Bad sequence of commands");
		m_internalState = internalState::mail_from;
		return answer(protocol::state::connected, "250 Ok");
	}
	if (boost::istarts_with(message, "rcpt to:"))
	{
		if (m_internalState != internalState::mail_from)
			return answer(protocol::state::connected, "503 Bad sequence of commands");
		m_internalState = internalState::rcpt_to;
		return answer(protocol::state::connected, "250 Ok");
	}
	if (boost::iequals(message, "data\r\n"))
	{
		if (m_internalState != internalState::rcpt_to)
			return answer(protocol::state::connected, "503 Bad sequence of commands");
		m_internalState = internalState::data;
		return answer(protocol::state::connected, "354 Go ahead");
	}

	return answer(protocol::state::connected, "502 Error");
}

protocol::result protocol::answer(protocol::state::type state, std::string answer) const
{
	if (answer.size() > 0)
		std::cout << "<- " << answer << std::endl;

	return result(state, answer);
}

void protocol::appendMessage(const std::string& message)
{
	m_message.append(message);
	m_message.append("\n");
}