<?php

class PrinterService {
    /**
     * Send raw ESC/POS data to a network printer.
     * 
     * @param string $ip Printer IP address
     * @param string $data Raw ESC/POS data
     * @param int $port Printer port (default 9100)
     * @return array Success status and error message if any
     */
    public static function sendToNetworkPrinter($ip, $data, $port = 9100) {
        if (empty($ip)) {
            return ['success' => false, 'error' => 'Printer IP is not configured.'];
        }

        // Determine if IP is local/private. If so, use a very short timeout 
        // because cloud servers cannot reach local IPs anyway.
        $isLocalIp = preg_match('/^(127\.|10\.|192\.168\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)/', $ip);
        $timeout = $isLocalIp ? 1 : 5; // 1 second for local, 5 for public

        try {
            $fp = @fsockopen($ip, $port, $errno, $errstr, $timeout);
            if (!$fp) {
                return ['success' => false, 'error' => "Could not connect to printer at $ip:$port. Error: $errstr ($errno)"];
            }

            fwrite($fp, $data);
            fclose($fp);

            return ['success' => true];
        } catch (Exception $e) {
            return ['success' => false, 'error' => 'Exception: ' . $e->getMessage()];
        }
    }

    /**
     * Generate basic ESC/POS receipt content.
     * This is a simplified version. For full features, an ESC/POS library is recommended.
     */
    public static function formatReceipt($order, $items, $company) {
        $esc = "\x1b";
        $gs = "\x1d";
        $line = str_repeat("-", 32) . "\n";
        
        $out = "";
        $out .= $esc . "!" . "\x38"; // Double height and width
        $out .= $esc . "a" . "\x01"; // Center align
        $out .= $company['company_name'] . "\n";
        $out .= $esc . "!" . "\x00"; // Reset
        $out .= $company['address'] . "\n";
        $out .= $company['phone'] . "\n\n";
        
        $out .= $esc . "a" . "\x00"; // Left align
        $out .= "Order ID: #" . $order['id'] . "\n";
        $out .= "Date: " . $order['created_at'] . "\n";
        $out .= $line;
        
        foreach ($items as $item) {
            $name = substr($item['name'], 0, 20);
            $qty = $item['quantity'] . "x";
            $price = number_format($item['price'], 2);
            $out .= sprintf("% -20s %3s %7s\n", $name, $qty, $price);
        }
        
        $out .= $line;
        $out .= sprintf("% -20s %11s\n", "TOTAL", number_format($order['total_amount'], 2));
        $out .= "\n\n\n\n";
        $out .= $esc . "m"; // Cut paper (optional, depending on printer) 
        
        return $out;
    }
}