/**

 * vim: set ts=4 :

 * =============================================================================

 * SourceMod Reserved Slots Plugin

 * Provides basic reserved slots.

 *

 * SourceMod (C)2004-2008 AlliedModders LLC.  All rights reserved.

 * =============================================================================

 *

 * This program is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License, version 3.0, as published by the

 * Free Software Foundation.

 * 

 * 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, see <http://www.gnu.org/licenses/>.

 *

 * As a special exception, AlliedModders LLC gives you permission to link the

 * code of this program (as well as its derivative works) to "Half-Life 2," the

 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

 * by the Valve Corporation.  You must obey the GNU General Public License in

 * all respects for all other code used.  Additionally, AlliedModders LLC grants

 * this exception to all derivative works.  AlliedModders LLC defines further

 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

 * or <http://www.sourcemod.net/license.php>.

 *

 * Version: $Id$

 */

#pragma semicolon 1

#include <sourcemod>

public Plugin:myinfo = 

{

	name = "Reserved Slots",

	author = "AlliedModders LLC",

	description = "Provides basic reserved slots",

	version = SOURCEMOD_VERSION,

	url = "http://www.sourcemod.net/"

};

/* Maximum number of clients that can connect to server */

new g_MaxClients;

new g_adminCount = 0;

new bool:g_isAdmin[MAXPLAYERS+1];

/* Handles to convars used by plugin */

new Handle:sm_reserved_slots;

new Handle:sm_hide_slots;

new Handle:sv_visiblemaxplayers;

new Handle:sm_reserve_type;

new Handle:sm_reserve_maxadmins;

new Handle:sm_reserve_kicktype;

enum KickType

{

	Kick_HighestPing,

	Kick_HighestTime,

	Kick_Random,	

};

public OnPluginStart()

{

	LoadTranslations("reservedslots.phrases");

	sm_reserved_slots = CreateConVar("sm_reserved_slots", "0", "Number of reserved player slots", 0, true, 0.0);

	sm_hide_slots = CreateConVar("sm_hide_slots", "0", "If set to 1, reserved slots will hidden (subtracted from the max slot count)", 0, true, 0.0, true, 1.0);

	sv_visiblemaxplayers = FindConVar("sv_visiblemaxplayers");

	sm_reserve_type = CreateConVar("sm_reserve_type", "0", "Method of reserving slots", 0, true, 0.0, true, 2.0);

	sm_reserve_maxadmins = CreateConVar("sm_reserve_maxadmins", "1", "Maximum amount of admins to let in the server with reserve type 2", 0, true, 0.0);

	sm_reserve_kicktype = CreateConVar("sm_reserve_kicktype", "0", "How to select a client to kick (if appropriate)", 0, true, 0.0, true, 2.0);

	HookConVarChange(sm_reserved_slots, SlotsChanged);

	HookConVarChange(sm_hide_slots, SlotsChanged);

}

public OnPluginEnd()

{

	/* 	If the plugin has been unloaded, reset visiblemaxplayers. In the case of the server shutting down this effect will not be visible */

	SetConVarInt(sv_visiblemaxplayers, g_MaxClients);

}

public OnMapStart()

{

	g_MaxClients = GetMaxClients();

	if (GetConVarBool(sm_hide_slots))

	{		

		SetVisibleMaxSlots(GetClientCount(false), g_MaxClients - GetConVarInt(sm_reserved_slots));

	}

}

public OnConfigsExecuted()

{

	if (GetConVarBool(sm_hide_slots))

	{

		SetVisibleMaxSlots(GetClientCount(false), g_MaxClients - GetConVarInt(sm_reserved_slots));

	}	

}

public Action:OnTimedKick(Handle:timer, any:client)

{	

	if (!client || !IsClientInGame(client))

	{

		return Plugin_Handled;

	}

	KickClient(client, "%T", "Slot reserved", client);

	if (GetConVarBool(sm_hide_slots))

	{				

		SetVisibleMaxSlots(GetClientCount(false), g_MaxClients - GetConVarInt(sm_reserved_slots));

	}

	return Plugin_Handled;

}

public OnClientPostAdminCheck(client)

{

	new reserved = GetConVarInt(sm_reserved_slots);

	if (reserved > 0)

	{

		new clients = GetClientCount(false);

		new limit = g_MaxClients - reserved;

		new flags = GetUserFlagBits(client);

		new type = GetConVarInt(sm_reserve_type);

		if (type == 0)

		{

			if (clients <= limit || IsFakeClient(client) || flags & ADMFLAG_ROOT || flags & ADMFLAG_RESERVATION)

			{

				if (GetConVarBool(sm_hide_slots))

				{

					SetVisibleMaxSlots(clients, limit);

				}

				return;

			}

			/* Kick player because there are no public slots left */

			CreateTimer(0.1, OnTimedKick, client);

		}

		else if (type == 1)

		{	

			if (clients > limit)

			{

				if (flags & ADMFLAG_ROOT || flags & ADMFLAG_RESERVATION)

				{

					new target = SelectKickClient();

					if (target)

					{

						/* Kick public player to free the reserved slot again */

						CreateTimer(0.1, OnTimedKick, target);

					}

				}

				else

				{				

					/* Kick player because there are no public slots left */

					CreateTimer(0.1, OnTimedKick, client);

				}

			}

		}

		else if (type == 2)

		{

			if (flags & ADMFLAG_ROOT || flags & ADMFLAG_RESERVATION)

			{

				g_adminCount++;

				g_isAdmin[client] = true;

			}

			if (clients > limit && g_adminCount < GetConVarInt(sm_reserve_maxadmins))

			{

				/* Server is full, reserved slots aren't and client doesn't have reserved slots access */

				if (g_isAdmin[client])

				{

					new target = SelectKickClient();

					if (target)

					{

						/* Kick public player to free the reserved slot again */

						CreateTimer(0.1, OnTimedKick, target);

					}

				}

				else

				{				

					/* Kick player because there are no public slots left */

					CreateTimer(0.1, OnTimedKick, client);

				}		

			}

		}

	}

}

public OnClientDisconnect_Post(client)

{

	if (GetConVarBool(sm_hide_slots))

	{		

		SetVisibleMaxSlots(GetClientCount(false), g_MaxClients - GetConVarInt(sm_reserved_slots));

	}

	if (g_isAdmin[client])

	{

		g_adminCount--;

		g_isAdmin[client] = false;	

	}

}

public SlotsChanged(Handle:convar, const String:oldValue[], const String:newValue[])

{

	/* Reserved slots or hidden slots have been disabled - reset sv_visiblemaxplayers */

	if (StringToInt(newValue) == 0)

	{

		SetConVarInt(sv_visiblemaxplayers, g_MaxClients);

	}

}

SetVisibleMaxSlots(clients, limit)

{

	new num = clients;

	if (clients == g_MaxClients)

	{

		num = g_MaxClients;

	} else if (clients < limit) {

		num = limit;

	}

	SetConVarInt(sv_visiblemaxplayers, num);

}

SelectKickClient()

{

	new KickType:type = KickType:GetConVarInt(sm_reserve_kicktype);

	new Float:highestValue;

	new highestValueId;

	new Float:highestSpecValue;

	new highestSpecValueId;

	new bool:specFound;

	new Float:value;

	for (new i=1; i<=g_MaxClients; i++)

	{	

		if (!IsClientConnected(i))

		{

			continue;

		}

		new flags = GetUserFlagBits(i);

		if (IsFakeClient(i) || flags & ADMFLAG_ROOT || flags & ADMFLAG_RESERVATION || CheckCommandAccess(i, "sm_reskick_immunity", ADMFLAG_RESERVATION, false))

		{

			continue;

		}

		value = 0.0;

		if (IsClientInGame(i))

		{

			if (type == Kick_HighestPing)

			{

				value = GetClientAvgLatency(i, NetFlow_Outgoing);

			}

			else if (type == Kick_HighestTime)

			{

				value = GetClientTime(i);

			}

			else

			{

				value = GetRandomFloat(0.0, 100.0);

			}

			if (IsClientObserver(i))

			{			

				specFound = true;

				if (value > highestSpecValue)

				{

					highestSpecValue = value;

					highestSpecValueId = i;

				}

			}

		}

		if (value >= highestValue)

		{

			highestValue = value;

			highestValueId = i;

		}

	}

	if (specFound)

	{

		return highestSpecValueId;

	}

	return highestValueId;

}