/******************************************************************************
 * 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 "i2-icinga.h"

using namespace icinga;

map<String, vector<String> > HostGroup::m_MembersCache;
bool HostGroup::m_MembersCacheValid = true;

static AttributeDescription hostGroupAttributes[] = {
	{ "alias", Attribute_Config },
	{ "notes_url", Attribute_Config },
	{ "action_url", Attribute_Config }
};

REGISTER_TYPE(HostGroup, hostGroupAttributes);

String HostGroup::GetAlias(void) const
{
	String value = Get("alias");

	if (!value.IsEmpty())
		return value;
	else
		return GetName();
}

String HostGroup::GetNotesUrl(void) const
{
	return Get("notes_url");
}

String HostGroup::GetActionUrl(void) const
{
	return Get("action_url");
}

bool HostGroup::Exists(const String& name)
{
	return (DynamicObject::GetObject("HostGroup", name));
}

HostGroup::Ptr HostGroup::GetByName(const String& name)
{
	DynamicObject::Ptr configObject = DynamicObject::GetObject("HostGroup", name);

	if (!configObject)
		throw_exception(invalid_argument("HostGroup '" + name + "' does not exist."));

	return dynamic_pointer_cast<HostGroup>(configObject);
}

set<Host::Ptr> HostGroup::GetMembers(void) const
{
	set<Host::Ptr> hosts;

	ValidateMembersCache();

	BOOST_FOREACH(const String& hst, m_MembersCache[GetName()]) {
		if (!Host::Exists(hst))
			continue;

		Host::Ptr host = Host::GetByName(hst);
		hosts.insert(host);
	}

	return hosts;
}

void HostGroup::InvalidateMembersCache(void)
{
	m_MembersCacheValid = false;
	m_MembersCache.clear();
}

void HostGroup::ValidateMembersCache(void)
{
	if (m_MembersCacheValid)
		return;

	m_MembersCache.clear();

	DynamicObject::Ptr object;
	BOOST_FOREACH(tie(tuples::ignore, object), DynamicType::GetByName("Host")->GetObjects()) {
		const Host::Ptr& host = static_pointer_cast<Host>(object);

		Dictionary::Ptr dict;
		dict = host->GetGroups();

		if (dict) {
			Value hostgroup;
			BOOST_FOREACH(tie(tuples::ignore, hostgroup), dict) {
				if (!HostGroup::Exists(hostgroup))
					Logger::Write(LogWarning, "icinga", "Host group '" + hostgroup + "' used but not defined.");

				m_MembersCache[hostgroup].push_back(host->GetName());
			}
		}
	}

	m_MembersCacheValid = true;
}