tf2-scripts/friendly_fire_toggle.sp

#include <sourcemod>
#include <tf2>

#define TOGGLE_TIME 612.0
#define MIN_FF_DURATION 30
#define MAX_FF_DURATION 270

public Plugin myinfo = 
{
    name = "Toggle Friendly Fire",
    author = "Retard",
    description = "Toggles Friendly Fire On/Off at random moments.",
    version = "1.0",
    url = "https://deadzone.lol"
};

Handle timerToggle = null;
bool g_bFriendlyFire = false;
bool g_bPluginEnabled = true;

public void OnPluginStart()
{
    RegConsoleCmd("sm_friendlyfire", CmdToggleFriendlyFire, "Toggle the Friendly Fire script. Admins with 'z' flag only.");
    StartToggleTimer();
}

public Action CmdToggleFriendlyFire(int client, int args)
{
    if (CheckCommandAccess(client, "sm_friendlyfire", ADMFLAG_ROOT))
    {
        g_bPluginEnabled = !g_bPluginEnabled

        if (g_bPluginEnabled)
        {
            PrintToChat(client, "Friendly Fire script has been enabled!");
            StartToggleTimer();
        }
        else
        {
            if (g_bFriendlyFire)
            {
                Handle hCvar = FindConVar("mp_friendlyfire");
                if (hCvar != INVALID_HANDLE)
                {
                    SetConVarInt(hCvar, 0);
                }
                g_bFriendlyFire = false;
                PrintToChatAll("[DEBUG] Friendly Fire is now OFF");
            }
            
            PrintToChat(client, "Friendly Fire script has been disabled!");

            if (timerToggle != null)
            {
                KillTimer(timerToggle);
                timerToggle = null;
            }
        }
    }
    else
    {
        PrintToChat(client, "You do not have permission to use this command.");
    }
    return Plugin_Handled;
}

void StartToggleTimer()
{
    if (!g_bPluginEnabled)
        return;

    if (timerToggle != null)
        KillTimer(timerToggle);

    timerToggle = CreateTimer(TOGGLE_TIME, ToggleFriendlyFire);
}

public Action ToggleFriendlyFire(Handle timer, any data)
{
    g_bFriendlyFire = !g_bFriendlyFire;
    
    Handle hCvar = FindConVar("mp_friendlyfire");
    if(hCvar == INVALID_HANDLE)
    {
        SetFailState("Failed to find 'mp_friendlyfire' cvar!");
    }
    SetConVarInt(hCvar, g_bFriendlyFire ? 1 : 0);
    
    PrintToChatAll("[DEBUG] Friendly Fire is now %s", g_bFriendlyFire ? "ON" : "OFF");

    StartToggleTimer();

    return Plugin_Continue;
}

public void OnPluginEnd()
{
    if(timerToggle != null)
    {
        KillTimer(timerToggle);
    }
}