/******************************************************************************
 * Icinga 2                                                                   *
 * Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org)    *
 *                                                                            *
 * This program is free software; you can redistribute it and/or              *
 * modify it under the terms of the GNU General Public License                *
 * as published by the Free Software Foundation; either version 2             *
 * of the License, or (at your option) any later version.                     *
 *                                                                            *
 * This program is distributed in the hope that it will be useful,            *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
 * GNU General Public License for more details.                               *
 *                                                                            *
 * You should have received a copy of the GNU General Public License          *
 * along with this program; if not, write to the Free Software Foundation     *
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
 ******************************************************************************/

#include "remote/endpoint.h"
#include "remote/jsonrpc.h"
#include "base/application.h"
#include "base/dynamictype.h"
#include "base/objectlock.h"
#include "base/utility.h"
#include "base/logger_fwd.h"
#include "base/exception.h"
#include "config/configitembuilder.h"

using namespace icinga;

REGISTER_TYPE(Endpoint);

boost::signals2::signal<void (const Endpoint::Ptr&)> Endpoint::OnConnected;
boost::signals2::signal<void (const Endpoint::Ptr&)> Endpoint::OnDisconnected;
boost::signals2::signal<void (const Endpoint::Ptr&, const Dictionary::Ptr&)> Endpoint::OnMessageReceived;

/**
 * Checks whether this endpoint is connected.
 *
 * @returns true if the endpoint is connected, false otherwise.
 */
bool Endpoint::IsConnected(void) const
{
	return GetClient() != NULL;
}

bool Endpoint::IsAvailable(void) const
{
	return GetSeen() > Utility::GetTime() - 30;
}

Stream::Ptr Endpoint::GetClient(void) const
{
	return m_Client;
}

void Endpoint::SetClient(const Stream::Ptr& client)
{
	SetBlockedUntil(Utility::GetTime() + 15);

	if (m_Client)
		m_Client->Close();

	m_Client = client;

	if (client) {
		boost::thread thread(boost::bind(&Endpoint::MessageThreadProc, this, client));
		thread.detach();

		OnConnected(GetSelf());
		Log(LogInformation, "remote", "Endpoint connected: " + GetName());
	} else {
		OnDisconnected(GetSelf());
		Log(LogInformation, "remote", "Endpoint disconnected: " + GetName());
	}
}

void Endpoint::SendMessage(const Dictionary::Ptr& message)
{
	Stream::Ptr client = GetClient();

	if (!client)
		return;

	try {
		JsonRpc::SendMessage(client, message);
	} catch (const std::exception& ex) {
		std::ostringstream msgbuf;
		msgbuf << "Error while sending JSON-RPC message for endpoint '" << GetName() << "': " << DiagnosticInformation(ex);
		Log(LogWarning, "remote", msgbuf.str());

		m_Client.reset();

		OnDisconnected(GetSelf());
		Log(LogWarning, "remote", "Endpoint disconnected: " + GetName());
	}
}

void Endpoint::MessageThreadProc(const Stream::Ptr& stream)
{
	Utility::SetThreadName("EndpointMsg");

	for (;;) {
		Dictionary::Ptr message;

		try {
			message = JsonRpc::ReadMessage(stream);
		} catch (const std::exception& ex) {
			Log(LogWarning, "remote", "Error while reading JSON-RPC message for endpoint '" + GetName() + "': " + DiagnosticInformation(ex));

			m_Client.reset();

			OnDisconnected(GetSelf());
			Log(LogWarning, "remote", "Endpoint disconnected: " + GetName());

			return;
		}

		OnMessageReceived(GetSelf(), message);
	}
}

bool Endpoint::HasFeature(const String& type) const
{
	Dictionary::Ptr features = GetFeatures();

	if (!features)
		return false;

	return features->Get(type);
}