sm-plugins/_ZItemKnockback/scripting/ZItemKnockback.sp

#pragma semicolon 1
#pragma newdecls required

#include <basic>
#include <sourcemod>
#include <sdkhooks>
#include <sdktools>
#include <dhooks>

#pragma semicolon 1
#pragma newdecls required

public Plugin myinfo =
{
	name 			= "ZItemKnockback",
	author 			= "BotoX",
	description 	= "",
	version 		= "0.0",
	url 			= ""
};

Handle hFireBulletDetour;
bool g_bLateLoad = false;

int g_LastAttacker = 0;
int g_LastVictim = 0;

// maps from edict index to object index
char g_EntityIdxToItemIdx[2048];

enum struct SItem
{
	bool m_Test;
}
SItem g_Items[255];

public void OnPluginStart()
{
	Handle hGameData = LoadGameConfigFile("ZItemKnockback.games");
	if(!hGameData)
		SetFailState("Failed to load ZItemKnockback gamedata.");

	hFireBulletDetour = DHookCreateFromConf(hGameData, "CCSPlayer__FireBullet");
	if(!hFireBulletDetour)
		SetFailState("Failed to setup detour for CCSPlayer__FireBullet");
	delete hGameData;

	if(!DHookEnableDetour(hFireBulletDetour, false, Detour_OnFireBullet))
		SetFailState("Failed to detour CCSPlayer__FireBullet.");
}

public APLRes AskPluginLoad2(Handle myself, bool late, char[] error, int err_max)
{
	g_bLateLoad = late;
	return APLRes_Success;
}

public void OnMapStart()
{
	bool bLate = g_bLateLoad;
	g_bLateLoad = false;

	char sMapName[PLATFORM_MAX_PATH];
	GetCurrentMap(sMapName, sizeof(sMapName));

	char sConfigFile[PLATFORM_MAX_PATH];
	BuildPath(Path_SM, sConfigFile, sizeof(sConfigFile), "configs/ZItemKnockback/%s.cfg", sMapName);
	if(!FileExists(sConfigFile))
	{
		LogMessage("Could not find mapconfig: \"%s\"", sConfigFile);
		return;
	}
	LogMessage("Found mapconfig: \"%s\"", sConfigFile);

	KeyValues KvConfig = new KeyValues("items");
	if(!KvConfig.ImportFromFile(sConfigFile))
	{
		delete KvConfig;
		LogError("ImportFromFile() failed!");
		return;
	}
	KvConfig.Rewind();

	if(!KvConfig.GotoFirstSubKey())
	{
		delete KvConfig;
		LogError("GotoFirstSubKey() failed!");
		return;
	}

	do
	{
		char sSection[64];
		KvConfig.GetSectionName(sSection, sizeof(sSection));

	} while(KvConfig.GotoNextKey(false));

	delete KvConfig;

	/* Late Load */
	for(int client = 1; client <= MaxClients; client++)
	{
		if(IsClientInGame(client))
			OnClientPutInServer(client);
	}
}


public void OnClientPutInServer(int client)
{
	SDKHook(client, SDKHook_WeaponEquipPost, OnWeaponEquip);
}

public Action OnWeaponEquip(int client, int entity)
{
	if(!IsValidEntity(entity))
		return;

	char sClassname[64];
	GetEntityClassname(entity, sClassname, sizeof(sClassname));
	if(strcmp(sClassname, "weapon_knife", false) != 0)
		return;

	int HammerID = GetEntProp(entity, Prop_Data, "m_iHammerID");
	if(!HammerID)
		return;

	CheckChildren(client, entity);
}

void CheckChildren(int client, int parent)
{
	int entity = INVALID_ENT_REFERENCE;
	while((entity = FindEntityByClassname(entity, "*")) != INVALID_ENT_REFERENCE)
	{
		if(GetEntPropEnt(entity, Prop_Data, "m_pParent") != parent)
			continue;

		char sClassname[64];
		GetEntityClassname(entity, sClassname, sizeof(sClassname));

		char sTargetname[64];
		GetEntPropString(entity, Prop_Data, "m_iName", sTargetname, sizeof(sTargetname));

		PrintToChatAll("%d child: \"%s\" %d (%s)", client, sClassname, entity, sTargetname);

		if(!strncmp(sClassname, "func_physbox", 12, false) || !strcmp(sClassname, "func_breakable", false))
		{
			SDKHook(entity, SDKHook_OnTakeDamage, OnTakeDamage);
			PrintToChatAll("Hooking \"%s\" %d (%s) OnTakeDamage", sClassname, entity, sTargetname);
		}
		else if(!strcmp(sClassname, "trigger_push", false))
		{
			AcceptEntityInput(entity, "Kill");
			PrintToChatAll("Killing \"%s\" %d (%s)", sClassname, entity, sTargetname);
		}
		else
		{
			CheckChildren(client, entity);
		}
	}
}

public Action OnPlayerRunCmd(int client, int &buttons, int &impulse, float vel[3], float angles[3], int &weapon, int &subtype, int &cmdnum, int &tickcount, int &seed, int mouse[2])
{
	// because knifes don't call FireBullet we reset it here too
	g_LastAttacker = 0;
	g_LastVictim = 0;
}

public MRESReturn Detour_OnFireBullet(int pThis, Handle hReturn, Handle hParams)
{
	// need to reset it per fired bullet else only one of the shotgun pellets would be able to hit the same player
	g_LastAttacker = 0;
	g_LastVictim = 0;
	return MRES_Handled;
}

public Action OnTakeDamage(int victim, int &attacker, int &inflictor, float &damage, int &damagetype, int &weapon, float damageForce[3], float damagePosition[3])
{
	if(attacker <= 0 || attacker > MAXPLAYERS)
		return Plugin_Continue;

	int client = victim;
	while((client = GetEntPropEnt(client, Prop_Data, "m_pParent")) != INVALID_ENT_REFERENCE)
	{
		if(client >= 1 && client <= MAXPLAYERS)
			break;
	}

	if(client <= 0)
		return Plugin_Handled;

	// fix multiple penetration
	if(g_LastAttacker == attacker && g_LastVictim == client)
		return Plugin_Handled;

	victim = client;

	g_LastAttacker = attacker;
	g_LastVictim = victim;

	SDKHooks_TakeDamage(victim, inflictor, attacker, damage, damagetype, weapon, damageForce, damagePosition);
	return Plugin_Handled;
}