/*
 * CSB Death Effects
 * Copyright (C) 2026 counter-strike-boost.com
 *
 * Adds extra visual flair to kills: a blood burst and gib shower at the victim's
 * position, plus an optional explosion for headshot or knife kills. Everything
 * is sent as temp entities to nearby players, each effect is cvar-toggled, and a
 * short per-victim cooldown keeps the effects from spamming the network.
 *
 * 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>

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

#define TE_EXPLOSION   3
#define TE_BLOODSPRITE 115

new const g_szExplode[]   = "sprites/zerogxplode.spr"
new const g_szBloodSpray[] = "sprites/bloodspray.spr"
new const g_szBloodDrop[]  = "sprites/blood.spr"
new const g_szGibs[]       = "models/hgibs.mdl"

new g_pEnabled, g_pBlood, g_pGibs, g_pExplode
new g_iSprExplode, g_iSprSpray, g_iSprDrop, g_iMdlGibs
new Float:g_fLastFx[33]

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

    g_pEnabled = register_cvar("csb_deathfx_enabled", "1")
    g_pBlood   = register_cvar("csb_deathfx_blood", "1")
    g_pGibs    = register_cvar("csb_deathfx_gibs", "1")
    g_pExplode = register_cvar("csb_deathfx_explode", "1")

    register_event("DeathMsg", "eventDeath", "a", "1>0")
}

public plugin_precache()
{
    g_iSprExplode = precache_model(g_szExplode)
    g_iSprSpray   = precache_model(g_szBloodSpray)
    g_iSprDrop    = precache_model(g_szBloodDrop)
    g_iMdlGibs    = precache_model(g_szGibs)
}

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

    new victim = read_data(2)
    new hs = read_data(3)

    if (victim < 1 || victim > 32 || !is_user_connected(victim))
        return

    /* rate limit per victim slot */
    if (get_gametime() - g_fLastFx[victim] < 0.3)
        return

    g_fLastFx[victim] = get_gametime()

    new weapon[32]
    read_data(4, weapon, charsmax(weapon))
    new bool:knife = (containi(weapon, "knife") != -1)

    static iOrigin[3], Float:fOrigin[3]
    get_user_origin(victim, iOrigin)
    fOrigin[0] = float(iOrigin[0])
    fOrigin[1] = float(iOrigin[1])
    fOrigin[2] = float(iOrigin[2])

    if (get_pcvar_num(g_pBlood))
        bloodBurst(fOrigin, iOrigin)

    if (get_pcvar_num(g_pGibs))
        gibShower(fOrigin, iOrigin)

    if (get_pcvar_num(g_pExplode) && (hs || knife))
        explosion(fOrigin, iOrigin)
}

bloodBurst(const Float:fOrigin[3], const iOrigin[3])
{
    message_begin_f(MSG_PVS, SVC_TEMPENTITY, fOrigin)
    write_byte(TE_BLOODSPRITE)
    write_coord(iOrigin[0])
    write_coord(iOrigin[1])
    write_coord(iOrigin[2] + 12)
    write_short(g_iSprSpray)
    write_short(g_iSprDrop)
    write_byte(70)   /* red blood colour index */
    write_byte(12)   /* scale */
    message_end()
}

gibShower(const Float:fOrigin[3], const iOrigin[3])
{
    message_begin_f(MSG_PVS, SVC_TEMPENTITY, fOrigin)
    write_byte(TE_BREAKMODEL)
    write_coord(iOrigin[0])
    write_coord(iOrigin[1])
    write_coord(iOrigin[2] + 24)
    write_coord(16)   /* size x */
    write_coord(16)   /* size y */
    write_coord(16)   /* size z */
    write_coord(0)    /* velocity x */
    write_coord(0)    /* velocity y */
    write_coord(80)   /* velocity z */
    write_byte(120)   /* random velocity */
    write_short(g_iMdlGibs)
    write_byte(12)    /* count */
    write_byte(25)    /* life (*0.1s) */
    write_byte(0x02)  /* flags: BREAK_FLESH */
    message_end()
}

explosion(const Float:fOrigin[3], const iOrigin[3])
{
    message_begin_f(MSG_PVS, SVC_TEMPENTITY, fOrigin)
    write_byte(TE_EXPLOSION)
    write_coord(iOrigin[0])
    write_coord(iOrigin[1])
    write_coord(iOrigin[2] + 16)
    write_short(g_iSprExplode)
    write_byte(10)   /* scale */
    write_byte(20)   /* framerate */
    write_byte(0x01) /* TE_EXPLFLAG_NOADDITIVE off / no sound flag stub */
    message_end()
}