<?php
class Logger {
    private $logPath;
    private $logLevel;
    private $maxFileSize;
    const LEVEL_DEBUG = 'debug';
    const LEVEL_INFO = 'info';
    const LEVEL_WARNING = 'warning';
    const LEVEL_ERROR = 'error';
    private $levelPriority = [
        self::LEVEL_DEBUG => 0,
        self::LEVEL_INFO => 1,
        self::LEVEL_WARNING => 2,
        self::LEVEL_ERROR => 3
    ];
    public function __construct($logPath, $logLevel = self::LEVEL_INFO, $maxFileSize = 10485760) {
        $this->logPath = rtrim($logPath, '/') . '/';
        $this->logLevel = $logLevel;
        $this->maxFileSize = $maxFileSize;
        if (!is_dir($this->logPath)) {
            mkdir($this->logPath, 0755, true);
        }
    }
    public function debug($message, $context = []) { $this->log(self::LEVEL_DEBUG, $message, $context); }
    public function info($message, $context = []) { $this->log(self::LEVEL_INFO, $message, $context); }
    public function warning($message, $context = []) { $this->log(self::LEVEL_WARNING, $message, $context); }
    public function error($message, $context = []) { $this->log(self::LEVEL_ERROR, $message, $context); }
    private function log($level, $message, $context = []) {
        if ($this->levelPriority[$level] < $this->levelPriority[$this->logLevel]) { return; }
        if (!empty($context)) {
            foreach ($context as $key => $value) {
                $message = str_replace('{' . $key . '}', (string)$value, $message);
            }
        }
        $timestamp = date('Y-m-d H:i:s');
        $pid = getmypid();
        $ip = $_SERVER['REMOTE_ADDR'] ?? '127.0.0.1';
        $formatted = sprintf("[%s] [%s] [PID: %d] [IP: %s] %s\n", $timestamp, strtoupper($level), $pid, $ip, $message);
        $logFile = $this->logPath . date('Y-m-d') . '.log';
        $this->rotate($logFile);
        file_put_contents($logFile, $formatted, FILE_APPEND | LOCK_EX);
    }
    private function rotate($logFile) {
        if (file_exists($logFile) && filesize($logFile) > $this->maxFileSize) {
            $backupFile = $logFile . '.' . date('His');
            rename($logFile, $backupFile);
        }
    }
    public function setLevel($level) { if (isset($this->levelPriority[$level])) { $this->logLevel = $level; } }
    public function getLevel() { return $this->logLevel; }
}