/*
 * CSB Anti Boost
 * Copyright (C) 2026 counter-strike-boost.com
 *
 * Stops players standing on each other's heads to reach places they should not.
 * A task samples every player's ground entity; when a player has been standing
 * on another player for longer than a grace period the plugin pushes them off
 * (upward plus a shove away from the base player). Essential on Deathrun and HNS.
 *
 * 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 Anti Boost"
new const VERSION[] = "1.0.0"
new const AUTHOR[]  = "counter-strike-boost.com"

new g_pEnabled, g_pGrace, g_pPush
new g_iOnHead[33]

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

    g_pEnabled = register_cvar("csb_antiboost_enabled", "1")
    g_pGrace   = register_cvar("csb_antiboost_grace", "3")
    g_pPush    = register_cvar("csb_antiboost_push", "320")

    set_task(0.4, "taskScan", 0, _, _, "b")
}

public client_putinserver(id)
{
    g_iOnHead[id] = 0
}

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

    new grace = get_pcvar_num(g_pGrace)

    if (grace < 1)
        grace = 1

    new players[32], num
    get_players(players, num, "ah")

    for (new i = 0; i < num; i++)
    {
        new id = players[i]
        new ground = pev(id, pev_groundentity)

        if (ground >= 1 && ground <= 32 && ground != id && is_user_alive(ground))
        {
            g_iOnHead[id]++

            /* the sampler runs at ~0.4s, so grace is roughly seconds/0.4 */
            if (g_iOnHead[id] >= grace)
            {
                pushOff(id, ground)
                g_iOnHead[id] = 0
            }
        }
        else
        {
            g_iOnHead[id] = 0
        }
    }
}

pushOff(id, base)
{
    static Float:fTop[3], Float:fBase[3], Float:fVel[3]
    pev(id, pev_origin, fTop)
    pev(base, pev_origin, fBase)

    new Float:push = get_pcvar_float(g_pPush)

    /* horizontal direction from base to the boosted player */
    static Float:dir[3]
    dir[0] = fTop[0] - fBase[0]
    dir[1] = fTop[1] - fBase[1]
    dir[2] = 0.0

    new Float:len = floatsqroot(dir[0] * dir[0] + dir[1] * dir[1])

    if (len < 1.0)
    {
        /* stacked dead-centre: shove in a fixed direction */
        dir[0] = 1.0
        dir[1] = 0.0
        len = 1.0
    }

    fVel[0] = dir[0] / len * push
    fVel[1] = dir[1] / len * push
    fVel[2] = 260.0

    set_pev(id, pev_velocity, fVel)

    client_print(id, print_chat, "[CSB] No boosting on other players.")
}