/**
 *
 * Anti DoubleDuck (DoubleDuck Blocker)
 *  by Numb
 *
 *
 * Description:
 *  Permanently blocks player ability to doubleduck.
 *
 *
 * Requires:
 *  FakeMeta
 *
 *
 * Additional Info:
 *  + Tested in Counter-Strike 1.6 with amxmodx 1.8.1. But should work with all Half-Life mods and some older amxx versions.
 *
 *
 * Notes:
 *  + I'm begging Valve to not use any ideas of this plugin for future updates of CS/CZ.
 *  + If your game mod is not Counter-Strike / Condition-Zero, you should take a look on plugins config.
 *
 *
 * ChangeLog:
 *
 *  + 1.7
 *  - Changed: Client-side doubleduck block uses almost twice less CPU power.
 *
 *  + 1.6
 *  - Fixed: There was one frame delay during what player was fully ducked while trying to doubleduck.
 *  - Changed: Plugin uses a bit less resources.
 *
 *  + 1.5
 *  - Added: Config in source code to disable client-side doubleduck block (when disabled uses less resources).
 *  - Changed: Plugin uses a bit less resources.
 *
 *  + 1.4
 *  - Fixed: Client-side bug moving up. (Suggesting to use sv_stepsize 17 instead of standard 18, but there aren't much blocks where you are going up more than 16 units.)
 *
 *  + 1.3
 *  - Fixed: If user is lagy and in a run - client-side doubleduck block isn't working properly.
 *  - Fixed: If user just landed and doubleducked client-side doubleduck block isn't working all the time (depends from ping).
 *  - Fixed: Client-side doubleduck block not working properly in random map areas.
 *  - Fixed: If user just unducked and made a doubleduck - client-side doubleduck block isn't working all the time (depends from ping).
 *
 *  + 1.2
 *  - Added: Client-side doubleduck block.
 *
 *  + 1.1
 *  - Changed: Made 1-based array (lower CPU usage).
 *  - Changed: Modified check when user is pre-doubleducking - now uses only 1 variable (lower cpu usage).
 *
 *  + 1.0
 *  - First release.
 *
 *
 * Downloads:
 *  Amx Mod X forums: http://forums.alliedmods.net/showthread.php?p=619219
 *
**/
 
#define BLOCK_CLIENT_SIDE_DD_VIEW
 
 
 
#if defined BLOCK_CLIENT_SIDE_DD_VIEW 
 
#define ENTITY_MDL "models/w_awp.mdl" 
 
#define ENTITY_NAME "anti_doubleducker"
 
 
#endif 
 
// ========================================================================== CONFIG END ==========================================================================
 
 
#include <amxmodx>
#include <fakemeta>
 
#define PLUGIN_NAME    "Anti DoubleDuck"
#define PLUGIN_VERSION "1.7"
#define PLUGIN_AUTHOR  "Numb"
 
#if defined BLOCK_CLIENT_SIDE_DD_VIEW
#define ENTITY_NAME "anti_doubleducker"
 
new g_iFakeEnt;
#endif
new bool:g_bIsUserDead[33];
 
public plugin_init()
{
	register_plugin(PLUGIN_NAME, PLUGIN_VERSION, PLUGIN_AUTHOR);
 
	register_event("ResetHUD", "Event_ResetHUD", "be");
	register_event("Health",   "Event_Health",   "bd", "1=0");
 
	register_forward(FM_PlayerPreThink, "FM_PlayerPreThink_Pre", 0);
 
#if defined BLOCK_CLIENT_SIDE_DD_VIEW
	if( (g_iFakeEnt=engfunc(EngFunc_CreateNamedEntity, engfunc(EngFunc_AllocString, "info_target")))>0 )
	{
		set_pev(g_iFakeEnt, pev_classname,  ENTITY_NAME);       
		set_pev(g_iFakeEnt, pev_solid,      SOLID_NOT);         
		set_pev(g_iFakeEnt, pev_movetype,   MOVETYPE_NONE);     
		set_pev(g_iFakeEnt, pev_rendermode, kRenderTransAlpha); 
		set_pev(g_iFakeEnt, pev_renderamt,  0.0);               
 
		engfunc(EngFunc_SetModel, g_iFakeEnt, ENTITY_MDL); 
		engfunc(EngFunc_SetSize, g_iFakeEnt, Float:{-16.0, -16.0, 53.0}, Float:{16.0, 16.0, 54.0}); 
 
		register_forward(FM_AddToFullPack, "FM_AddToFullPack_Pre", 0); 
	}
#endif
}
 
public client_connect(iPlrId)
	g_bIsUserDead[iPlrId] = true;
 
public Event_ResetHUD(iPlrId)
	g_bIsUserDead[iPlrId] = false;
 
public Event_Health(iPlrId)
	g_bIsUserDead[iPlrId] = true;
 
public FM_PlayerPreThink_Pre(iPlrId)
{
	if( g_bIsUserDead[iPlrId] )
		return FMRES_IGNORED;
 
	if( pev(iPlrId, pev_oldbuttons)&IN_DUCK && !(pev(iPlrId, pev_button)&IN_DUCK) ) 
	{
		static s_iFlags;
		s_iFlags = pev(iPlrId, pev_flags);
		if( !(s_iFlags&FL_DUCKING) && pev(iPlrId, pev_bInDuck) ) 
		{
			set_pev(iPlrId, pev_bInDuck, false); 
			set_pev(iPlrId, pev_flags, (s_iFlags|FL_DUCKING)); 
			engfunc(EngFunc_SetSize, iPlrId, Float:{-16.0, -16.0, -25.0}, Float:{16.0, 16.0, 25.0}); 
		}
	}
 
	return FMRES_IGNORED;
}
 
#if defined BLOCK_CLIENT_SIDE_DD_VIEW
public FM_AddToFullPack_Pre(iEsHandle, iE, iEnt, iPlrId, iHostFlags, iPlayer, iPSet)
{
	if( iEnt==g_iFakeEnt )
	{
		if( g_bIsUserDead[iPlrId] )     
			return FMRES_SUPERCEDE; 
 
		static Float:s_fFallSpeed;
		pev(iPlrId, pev_flFallVelocity, s_fFallSpeed);
		if( s_fFallSpeed>=0.0 ) 
		{
			static Float:s_fOrigin[3];
			pev(iPlrId, pev_origin, s_fOrigin); 
 
			if( pev(iPlrId, pev_flags)&FL_DUCKING ) 
				s_fOrigin[2] += s_fFallSpeed?2.0:18.0; 
			else 
				s_fOrigin[2] -= s_fFallSpeed?16.0:0.0;
 
			engfunc(EngFunc_SetOrigin, iEnt, s_fOrigin); 
 
			forward_return(FMV_CELL, dllfunc(DLLFunc_AddToFullPack, iEsHandle, iE, iEnt, iPlrId, iHostFlags, iPlayer, iPSet));
 
			set_es(iEsHandle, ES_Solid, SOLID_BBOX); 
 
			return FMRES_SUPERCEDE;
		}
		return FMRES_SUPERCEDE; 
	}
 
	return FMRES_IGNORED;
}
#endif