<?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. 
        // Cloud servers cannot reach local network IPs (e.g., 192.168.x.x).
        // If it's a local IP, we return immediately to avoid the 1-second fsockopen timeout.
        $isLocalIp = preg_match('/^(127\.|10\.|192\.168\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)/', $ip);
        if ($isLocalIp) {
            return ['success' => false, 'error' => "Cannot connect to local network IP $ip from cloud. Please use a public IP or a local print proxy."];
        }

        $timeout = 5; // 5 seconds for public IPs

        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.
     */
    public static function formatReceipt($order, $items, $company) {
        $esc = "\x1b";
        $gs = "\x1d";
        $line = str_repeat("-", 32) . "\n";
        
        $out = "";
        $out .= $esc . "@"; // Initialize printer
        $out .= $esc . "!" . "\x38"; // Double height and width
        $out .= $esc . "a" . "\x01"; // Center align
        $out .= ($company['company_name'] ?? 'Restaurant') . "\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'] ?? date('Y-m-d H:i:s')) . "\n";
        if (!empty($order['customer_name'])) {
            $out .= "Customer: " . $order['customer_name'] . "\n";
        }
        if (!empty($order['customer_phone'])) {
            $out .= "Phone: " . $order['customer_phone'] . "\n";
        }
        if (!empty($order['car_plate'])) {
            $out .= "Car Plate: " . $order['car_plate'] . "\n";
        }
        $out .= $line;
        
        foreach ($items as $item) {
            $name = substr(($item['product_name'] ?? $item['name'] ?? 'Item'), 0, 20);
            $qty = ($item['quantity'] ?? 1) . "x";
            $price = number_format((float)($item['unit_price'] ?? $item['price'] ?? 0), 2);
            $out .= sprintf("% -20s %3s %7s\n", $name, $qty, $price);
            
            if (!empty($item['variant_name'])) {
                $out .= "  (" . $item['variant_name'] . ")\n";
            }
        }
        
        $out .= $line;
        $out .= sprintf("% -20s %11s\n", "TOTAL", number_format((float)($order['total_amount'] ?? 0), 2));
        $out .= "\n\n\n\n";
        $out .= $esc . "m"; // Cut paper
        
        return $out;
    }
}