/*
 * CSB MOTD News
 * Copyright (C) 2026 counter-strike-boost.com
 *
 * Shows a news / changelog MOTD to players, but only when it actually changed.
 * The news file's first line carries a version number; that number is stored per
 * SteamID in an nVault, so a returning player is not shown the same news twice.
 * The MOTD itself is rendered from a local file (or a URL, if one is set).
 * Players can re-open the latest news any time with /news.
 *
 * 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 <nvault>

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

new g_pEnabled, g_pFile, g_pUrl, g_pTitle
new g_iVault
new g_iNewsVersion

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

    g_pEnabled = register_cvar("csb_news_enabled", "1")
    g_pFile    = register_cvar("csb_news_file", "csb_news.txt")
    g_pUrl     = register_cvar("csb_news_url", "")
    g_pTitle   = register_cvar("csb_news_title", "Server News")

    register_clcmd("say /news", "cmdNews")
    register_clcmd("say_team /news", "cmdNews")

    g_iVault = nvault_open("csb_news")

    if (g_iVault == INVALID_HANDLE)
        set_fail_state("Could not open csb_news nvault")

    g_iNewsVersion = readNewsVersion()
}

public plugin_end()
{
    if (g_iVault != INVALID_HANDLE)
        nvault_close(g_iVault)
}

readNewsVersion()
{
    new file[64]
    get_pcvar_string(g_pFile, file, charsmax(file))

    if (!file[0] || !file_exists(file))
        return 0

    new f = fopen(file, "rt")
    if (!f)
        return 0

    new line[64]
    fgets(f, line, charsmax(line))
    fclose(f)

    trim(line)

    /* accept "version 7" or a bare "7" on the first line */
    new digits[16], j = 0
    for (new i = 0; line[i] && j < charsmax(digits); i++)
    {
        if (line[i] >= '0' && line[i] <= '9')
            digits[j++] = line[i]
    }
    digits[j] = 0

    return str_to_num(digits)
}

public client_authorized(id)
{
    if (!get_pcvar_num(g_pEnabled) || is_user_bot(id))
        return

    if (g_iNewsVersion <= 0)
        return

    new authid[35]
    get_user_authid(id, authid, charsmax(authid))

    new seen = getSeen(authid)

    if (g_iNewsVersion > seen)
    {
        set_task(3.0, "taskShow", id)
        setSeen(authid, g_iNewsVersion)
    }
}

getSeen(const authid[])
{
    new data[16], timestamp
    if (nvault_lookup(g_iVault, authid, data, charsmax(data), timestamp))
        return str_to_num(data)

    return 0
}

setSeen(const authid[], version)
{
    new data[16]
    num_to_str(version, data, charsmax(data))
    nvault_set(g_iVault, authid, data)
}

public taskShow(id)
{
    if (is_user_connected(id))
        showNews(id)
}

public cmdNews(id)
{
    showNews(id)
    return PLUGIN_HANDLED
}

showNews(id)
{
    new title[48]
    get_pcvar_string(g_pTitle, title, charsmax(title))

    new url[128]
    get_pcvar_string(g_pUrl, url, charsmax(url))

    if (url[0])
    {
        show_motd(id, url, title)
        return
    }

    new file[64]
    get_pcvar_string(g_pFile, file, charsmax(file))

    if (file[0] && file_exists(file))
    {
        show_motd(id, file, title)
    }
    else
    {
        client_print(id, print_chat, "[CSB] No news file is configured.")
    }
}