#include <sstream>
#include "Util/JSON.h"
#include "Util/Logger.h"
#include "Device.h"


namespace PresenceDetection {
namespace UniFi {

Device::Device(const std::string& hostname, const std::string& username, const std::string& password, const std::string& cookieFile, const std::string& inventoryURL, const std::string& target) :
	m_loggedIn(false),
	m_hostname(hostname),
	m_username(username),
	m_password(password),
	m_cookieFile(cookieFile),
	m_inventoryURL(inventoryURL),
	m_target(target),
	m_offlineTimeout(120)
{
	UpdateDevicesFromInventory();
	Start();
}

Device::~Device()
{
	Logout();
}

void Device::Start()
{
	m_deviceTimer.StartContinuous(5000, static_cast<std::function<void()>>(std::bind(&Device::UpdatePresentDevices, this)));
	m_inventoryTimer.StartContinuous(300000, static_cast<std::function<void()>>(std::bind(&Device::UpdateDevicesFromInventory, this)));
}

void Device::Stop()
{
	m_deviceTimer.Stop();
}

void Device::Wait()
{
	m_deviceTimer.Wait();
}

bool Device::Login()
{
	std::stringstream url;
	url << "https://" << m_hostname << "/api/login";

	Util::JSON json;
	json["password"] = m_password;
	json["username"] = m_username;

	try
	{
		std::stringstream output;
		output << m_httpClient.GetUrlPostContents(url.str(), m_cookieFile, json.dump(), "application/json");

		Util::JSON outputJSON = Util::JSON::parse(output);

		if (outputJSON["meta"]["rc"] != "ok")
		{
			std::stringstream error;
			error << "Login Failed - " << output.str();
			throw std::runtime_error(error.str());
		}
	}
	catch (const std::exception& e)
	{
		std::stringstream ss;
		ss << "UniFi::Device::Login() - Error: " << e.what() << std::endl;
		Util::Logger::Log(Util::Logger::Severity::Error, ss.str());
		std::lock_guard<std::mutex> lock(m_mutex);
		m_loggedIn = false;
		return m_loggedIn;
	}

	std::lock_guard<std::mutex> lock(m_mutex);
	m_loggedIn = true;
	return m_loggedIn;
}

void Device::Logout()
{
	std::stringstream url;
	url << "https://" << m_hostname << "/logout";

	std::lock_guard<std::mutex> lock(m_mutex);
	m_loggedIn = false;

	try
	{
		m_httpClient.GetUrlSilent(url.str(), m_cookieFile);
	}
	catch (const std::exception& e)
	{
		std::stringstream ss;
		ss << "UniFi::Device::Logout() - Error: " << e.what() << std::endl;
		Util::Logger::Log(Util::Logger::Severity::Error, ss.str());
	}
}

void Device::UpdateDevicesFromInventory()
{
	try
	{
		std::string devices = m_httpClient.GetUrlContents(m_inventoryURL);
		Util::JSON json = Util::JSON::parse(devices);

		m_devices.clear();
		for (auto& element : json)
			if (element["macaddress"] != "")
			{
				std::string macAddress = element["macaddress"];
				std::transform(macAddress.begin(), macAddress.end(), macAddress.begin(), ::tolower);
				m_devices.push_back(macAddress);
			}
	}
	catch (const std::exception& e)
	{
		std::stringstream ss;
		ss << "UniFi::Device::GetDevicesFromInventory() - Error: " << e.what() << std::endl;
		Util::Logger::Log(Util::Logger::Severity::Error, ss.str());
	}
}

void Device::UpdatePresentDevices()
{
	bool loggedIn;
	{
		std::lock_guard<std::mutex> lock(m_mutex);
		loggedIn = m_loggedIn;
	}

	if (!loggedIn)
		if (!Login())
			return;

	std::stringstream url;
	url << "https://" << m_hostname << "/api/s/default/stat/sta";

	std::time_t timeStamp = std::time(nullptr);
	std::vector<std::string> presentDevices;
	std::vector<std::string> addedDevices;
	std::vector<std::string> removedDevices;

	try
	{
		std::stringstream output;
		output << m_httpClient.GetUrlContents(url.str(), m_cookieFile);

		Util::JSON json = Util::JSON::parse(output);

		if (json["meta"]["rc"] != "ok")
		{
			std::stringstream error;
			error << "Query Failed";
			throw std::runtime_error(error.str());
		}

		for (auto& device : json["data"])
		{
			std::string macAddress = device["mac"];
			int lastSeen = device["last_seen"];

			if ((timeStamp - lastSeen) < m_offlineTimeout)
			{
				if (std::find(m_devices.begin(), m_devices.end(), macAddress) != m_devices.end())
				{
					if (std::find(m_presentDevices.begin(), m_presentDevices.end(), macAddress) == m_presentDevices.end())
						addedDevices.push_back(macAddress);
					presentDevices.push_back(macAddress);
				}
			}
		}
	}
	catch (const std::exception& e)
	{
		std::stringstream ss;
		ss << "UniFi::Device::IsDevicePresent() - Error: " << e.what() << std::endl;
		Util::Logger::Log(Util::Logger::Severity::Error, ss.str());
		Logout();
		return;
	}

	for (std::vector<std::string>::iterator it = m_presentDevices.begin(); it != m_presentDevices.end(); ++it)
		if (std::find(presentDevices.begin(), presentDevices.end(), *it) == presentDevices.end())
			removedDevices.push_back(*it);

	for (std::vector<std::string>::iterator it = addedDevices.begin(); it != addedDevices.end(); ++it)
		SendStateChange(true, *it);

	for (std::vector<std::string>::iterator it = removedDevices.begin(); it != removedDevices.end(); ++it)
		SendStateChange(false, *it);

	m_presentDevices.assign(presentDevices.begin(), presentDevices.end());
}

void Device::SendStateChange(bool present, const std::string& macAddress)
{
	char sign;
	if (present)
		sign = '+';
	else
		sign = '-';

	std::stringstream ss;
	ss << "UniFi: " << sign << " " << macAddress;
	Util::Logger::Log(Util::Logger::Severity::Info, ss.str());


	try
	{
		m_httpClient.GetUrlSilent(url.str());
	}
	catch (const std::exception& e)
	{
	}
}

} // namespace UniFi
} // namespace PresenceDetection