<?php

class BotLogger
{
    const LOG_FILE = _PS_ROOT_DIR_ . '/var/logs/botlimiter_ban.log';
    const MAX_SIZE = 10485760; // 10 MB

    public static function logBan($ip, $reason)
    {
        // 1. Check file size before writing (The Safety Valve)
        if (file_exists(self::LOG_FILE) && filesize(self::LOG_FILE) > self::MAX_SIZE) {
            self::rotateLog();
        }

        $date = date('Y-m-d H:i:s');
        $message = sprintf("[%s] [IP:%s] [REASON:%s]" . PHP_EOL, $date, $ip, $reason);

        // 2. Append to log file
        file_put_contents(self::LOG_FILE, $message, FILE_APPEND | LOCK_EX);
    }

    /**
     * Rotates the log:
     * 1. Deletes the .old file
     * 2. Renames current .log to .old
     * 3. Current logging continues in new empty file
     */
    private static function rotateLog()
    {
        $backup_file = self::LOG_FILE . '.old';

        // Remove ancient backup
        if (file_exists($backup_file)) {
            @unlink($backup_file);
        }

        // Rename current to backup
        @rename(self::LOG_FILE, $backup_file);
    }
}