/*
 * CSB Speedhack Detection
 * Copyright (C) 2026 counter-strike-boost.com
 *
 * Counts usercmd frames per real second (from CmdStart) and compares them to a
 * sane ceiling. A speedhack inflates the command rate; sustained excess over
 * several strikes is logged and optionally kicked.
 *
 * 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 3 of the License, or (at your option) any later
 * version. It 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 <https://www.gnu.org/licenses/> for details.
 */

#include <amxmodx>
#include <fakemeta>

new const PLUGIN[] = "CSB Speedhack Detection"
new const VERSION[] = "1.0.0"
new const AUTHOR[]  = "counter-strike-boost.com"

new g_pEnabled, g_pMaxCmds, g_pStrikes, g_pAction

new g_iFrames[33]
new g_iStrikes[33]

public plugin_init()
{
    register_plugin(PLUGIN, VERSION, AUTHOR)

    g_pEnabled = register_cvar("csb_speed_enabled", "1")
    g_pMaxCmds = register_cvar("csb_speed_maxcmds", "350")
    g_pStrikes = register_cvar("csb_speed_strikes", "3")
    g_pAction  = register_cvar("csb_speed_action", "0")

    register_forward(FM_CmdStart, "fwCmdStart")
    set_task(1.0, "taskCheck", 0, _, _, "b")
}

public client_putinserver(id)
{
    g_iFrames[id]  = 0
    g_iStrikes[id] = 0
}

public fwCmdStart(id)
{
    if (id >= 1 && id <= 32)
        g_iFrames[id]++

    return FMRES_IGNORED
}

public taskCheck()
{
    if (!get_pcvar_num(g_pEnabled))
        return

    new maxCmds    = get_pcvar_num(g_pMaxCmds)
    new maxStrikes = get_pcvar_num(g_pStrikes)

    new players[32], num
    get_players(players, num, "c")   // connected humans only

    for (new i = 0; i < num; i++)
    {
        new id = players[i]
        new frames = g_iFrames[id]
        g_iFrames[id] = 0

        if (frames > maxCmds)
        {
            g_iStrikes[id]++

            log_amx("[CSB Speed] %d usercmds/s from slot %d (strike %d/%d)", frames, id, g_iStrikes[id], maxStrikes)

            if (g_iStrikes[id] >= maxStrikes)
            {
                punish(id, frames)
                g_iStrikes[id] = 0
            }
        }
        else if (g_iStrikes[id] > 0)
        {
            // decay: one clean second forgives one strike
            g_iStrikes[id]--
        }
    }
}

punish(id, frames)
{
    new name[32], authid[35]
    get_user_name(id, name, charsmax(name))
    get_user_authid(id, authid, charsmax(authid))

    log_amx("[CSB Speed] speedhack confirmed for %s <%s> (%d usercmds/s)", name, authid, frames)

    if (get_pcvar_num(g_pAction) == 1)
    {
        server_cmd("kick #%d ^"CSB: speedhack detected^"", get_user_userid(id))
        server_exec()
    }
    else
    {
        client_print(0, print_chat, "[CSB] %s is suspected of using a speedhack.", name)
    }
}