/******************************************************************************
 * Icinga 2                                                                   *
 * Copyright (C) 2012 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 "icinga/service.h"
#include "base/dynamictype.h"
#include "base/objectlock.h"
#include "base/logger_fwd.h"
#include "base/timer.h"
#include "base/utility.h"
#include "config/configitembuilder.h"
#include <boost/tuple/tuple.hpp>
#include <boost/smart_ptr/make_shared.hpp>
#include <boost/foreach.hpp>
#include <boost/exception/diagnostic_information.hpp>

using namespace icinga;

boost::signals2::signal<void (const Service::Ptr&, const User::Ptr&, const NotificationType&, const Dictionary::Ptr&, const String&, const String&)> Service::OnNotificationSentChanged;

Dictionary::Ptr Service::GetNotificationDescriptions(void) const
{
	return m_NotificationDescriptions;
}

void Service::ResetNotificationNumbers(void)
{
	BOOST_FOREACH(const Notification::Ptr& notification, GetNotifications()) {
		ObjectLock olock(notification);
		notification->ResetNotificationNumber();
	}
}

void Service::SendNotifications(NotificationType type, const Dictionary::Ptr& cr, const String& author, const String& text)
{
	bool force = false;

	if (!GetEnableNotifications()) {
		if (!GetForceNextNotification()) {
			Log(LogInformation, "icinga", "Notifications are disabled for service '" + GetName() + "'.");
			return;
		}

		force = true;
		SetForceNextNotification(false);
	}

	Log(LogInformation, "icinga", "Sending notifications for service '" + GetName() + "'");

	std::set<Notification::Ptr> notifications = GetNotifications();

	if (notifications.empty())
		Log(LogInformation, "icinga", "Service '" + GetName() + "' does not have any notifications.");

	BOOST_FOREACH(const Notification::Ptr& notification, notifications) {
		try {
			notification->BeginExecuteNotification(type, cr, force, author, text);
		} catch (const std::exception& ex) {
			std::ostringstream msgbuf;
			msgbuf << "Exception occured during notification for service '"
			       << GetName() << "': " << boost::diagnostic_information(ex);
			String message = msgbuf.str();

			Log(LogWarning, "icinga", message);
		}
	}
}

std::set<Notification::Ptr> Service::GetNotifications(void) const
{
	return m_Notifications;
}

void Service::AddNotification(const Notification::Ptr& notification)
{
	m_Notifications.insert(notification);
}

void Service::RemoveNotification(const Notification::Ptr& notification)
{
	m_Notifications.erase(notification);
}

void Service::UpdateSlaveNotifications(void)
{
	ConfigItem::Ptr serviceItem, hostItem;

	serviceItem = ConfigItem::GetObject("Service", GetName());

	/* Don't create slave notifications unless we own this object */
	if (!serviceItem)
		return;

	Host::Ptr host = GetHost();

	if (!host)
		return;

	hostItem = ConfigItem::GetObject("Host", host->GetName());

	/* Don't create slave notifications unless we own the host */
	if (!hostItem)
		return;

	std::vector<Dictionary::Ptr> descLists;

	descLists.push_back(GetNotificationDescriptions());
	descLists.push_back(host->GetNotificationDescriptions());

	for (int i = 0; i < 2; i++) {
		Dictionary::Ptr descs;
		ConfigItem::Ptr item;

		if (i == 0) {
			/* Host notification descs */
			descs = host->GetNotificationDescriptions();
			item = hostItem;
		} else {
			/* Service notification descs */
			descs = GetNotificationDescriptions();
			item = serviceItem;
		}

		if (!descs)
			continue;

		ObjectLock olock(descs);

		String nfcname;
		Value nfcdesc;
		BOOST_FOREACH(boost::tie(nfcname, nfcdesc), descs) {
			std::ostringstream namebuf;
			namebuf << GetName() << ":" << nfcname;
			String name = namebuf.str();

			ConfigItemBuilder::Ptr builder = boost::make_shared<ConfigItemBuilder>(item->GetDebugInfo());
			builder->SetType("Notification");
			builder->SetName(name);
			builder->AddExpression("host_name", OperatorSet, host->GetName());
			builder->AddExpression("service", OperatorSet, GetShortName());

			if (!nfcdesc.IsObjectType<Dictionary>())
				BOOST_THROW_EXCEPTION(std::invalid_argument("Notification description must be a dictionary."));

			Dictionary::Ptr notification = nfcdesc;

			Array::Ptr templates = notification->Get("templates");

			if (templates) {
				ObjectLock tlock(templates);

				BOOST_FOREACH(const Value& tmpl, templates) {
					builder->AddParent(tmpl);
				}
			}

			/* Clone attributes from the host/service object. */
			std::set<String, string_iless> keys;
			keys.insert("users");
			keys.insert("groups");
			keys.insert("notification_interval");
			keys.insert("notification_period");
			keys.insert("notification_type_filter");
			keys.insert("notification_state_filter");
			keys.insert("export_macros");

			ExpressionList::Ptr svc_exprl = boost::make_shared<ExpressionList>();
			item->GetLinkedExpressionList()->ExtractFiltered(keys, svc_exprl);
			builder->AddExpressionList(svc_exprl);

			/* Clone attributes from the notification expression list. */
			std::vector<String> path;
			path.push_back("notifications");
			path.push_back(nfcname);

			ExpressionList::Ptr nfc_exprl = boost::make_shared<ExpressionList>();
			item->GetLinkedExpressionList()->ExtractPath(path, nfc_exprl);
			builder->AddExpressionList(nfc_exprl);

			ConfigItem::Ptr notificationItem = builder->Compile();
			DynamicObject::Ptr dobj = notificationItem->Commit();
			dobj->Start();
		}
	}
}

bool Service::GetEnableNotifications(void) const
{
	if (m_EnableNotifications.IsEmpty())
		return true;
	else
		return m_EnableNotifications;
}

void Service::SetEnableNotifications(bool enabled)
{
	m_EnableNotifications = enabled;
}

bool Service::GetForceNextNotification(void) const
{
	if (m_ForceNextNotification.IsEmpty())
		return false;

	return static_cast<bool>(m_ForceNextNotification);
}

void Service::SetForceNextNotification(bool forced, const String& authority)
{
	m_ForceNextNotification = forced ? 1 : 0;

	Utility::QueueAsyncCallback(bind(boost::ref(OnForceNextNotificationChanged), GetSelf(), forced, authority));
}