/*
 * CSB Buy HP
 * Copyright (C) 2026 counter-strike-boost.com
 *
 * A self-contained shop item: spend credits to buy extra health, up to a cap,
 * with a per-round purchase limit and a HUD confirmation. Credits are earned by
 * killing, so the plugin works on any server without an external shop core --
 * but it exposes csb_hp_give() so a larger shop can grant HP through it too.
 *
 * 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. See <https://www.gnu.org/licenses/> for details.
 */

#include <amxmodx>
#include <fun>

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

new g_pEnabled, g_pCost, g_pAmount, g_pMaxHp, g_pLimit, g_pReward

new g_iCredits[33]
new g_iBoughtThisRound[33]

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

    g_pEnabled = register_cvar("csb_buyhp_enabled", "1")
    g_pCost    = register_cvar("csb_buyhp_cost", "10")
    g_pAmount  = register_cvar("csb_buyhp_amount", "25")
    g_pMaxHp   = register_cvar("csb_buyhp_maxhp", "150")
    g_pLimit   = register_cvar("csb_buyhp_limit", "3")
    g_pReward  = register_cvar("csb_buyhp_reward", "2")

    register_clcmd("say /buyhp",      "cmdBuyHp")
    register_clcmd("say_team /buyhp", "cmdBuyHp")
    register_clcmd("say /credits",    "cmdCredits")

    register_event("DeathMsg", "evDeath", "a")
    register_logevent("evRoundStart", 2, "1=Round_Start")
}

public client_connect(id)
{
    g_iCredits[id] = 0
    g_iBoughtThisRound[id] = 0
}

public evRoundStart()
{
    for (new id = 1; id <= 32; id++)
        g_iBoughtThisRound[id] = 0
}

public evDeath()
{
    new killer = read_data(1)
    new victim = read_data(2)

    if (killer >= 1 && killer <= 32 && killer != victim && is_user_connected(killer))
        g_iCredits[killer] += get_pcvar_num(g_pReward)
}

public cmdCredits(id)
{
    client_print_color(id, print_team_default,
        "^x04[CSB]^x01 You have^x04 %d^x01 credits. Type^x04 /buyhp^x01 to buy health.",
        g_iCredits[id])
    return PLUGIN_HANDLED
}

public cmdBuyHp(id)
{
    if (!get_pcvar_num(g_pEnabled))
    {
        client_print_color(id, print_team_default, "^x04[CSB]^x01 The shop is disabled.")
        return PLUGIN_HANDLED
    }

    if (!is_user_alive(id))
    {
        client_print_color(id, print_team_default, "^x04[CSB]^x01 You must be alive to buy health.")
        return PLUGIN_HANDLED
    }

    new limit = get_pcvar_num(g_pLimit)
    if (limit > 0 && g_iBoughtThisRound[id] >= limit)
    {
        client_print_color(id, print_team_default,
            "^x04[CSB]^x01 You already bought health^x04 %d^x01 time(s) this round.", limit)
        return PLUGIN_HANDLED
    }

    new cost = get_pcvar_num(g_pCost)
    if (g_iCredits[id] < cost)
    {
        client_print_color(id, print_team_default,
            "^x04[CSB]^x01 Not enough credits: you have^x04 %d^x01, this costs^x04 %d^x01.",
            g_iCredits[id], cost)
        return PLUGIN_HANDLED
    }

    new maxHp = get_pcvar_num(g_pMaxHp)
    new curHp = get_user_health(id)

    if (curHp >= maxHp)
    {
        client_print_color(id, print_team_default,
            "^x04[CSB]^x01 You are already at the^x04 %d^x01 HP cap.", maxHp)
        return PLUGIN_HANDLED
    }

    g_iCredits[id] -= cost
    g_iBoughtThisRound[id]++

    new added = csb_hp_give(id, get_pcvar_num(g_pAmount))

    set_hudmessage(0, 200, 0, -1.0, 0.65, 0, 0.0, 3.0, 0.1, 0.2, -1)
    show_hudmessage(id, "+%d HP  (-%d credits)", added, cost)

    client_print_color(id, print_team_default,
        "^x04[CSB]^x01 Bought^x04 +%d^x01 HP. Credits left:^x04 %d^x01.",
        added, g_iCredits[id])

    return PLUGIN_HANDLED
}

/* Public helper a bigger shop can call: give HP up to the cap, returns added. */
public csb_hp_give(id, amount)
{
    if (!is_user_alive(id))
        return 0

    new maxHp = get_pcvar_num(g_pMaxHp)
    new curHp = get_user_health(id)

    new newHp = curHp + amount
    if (newHp > maxHp)
        newHp = maxHp

    set_user_health(id, newHp)
    return newHp - curHp
}