Barcode Printing Utility Done
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import 'dart:async';
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import 'dart:io';
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import 'package:flutter/foundation.dart';
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import 'package:printing/printing.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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import '../domain/label_document.dart';
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import '../../inventory/domain/product.dart';
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class PrinterDevice {
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final String id;
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final String name;
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final String ipAddress;
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final int port;
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final String language; // ZPL, TSPL, ESCPOS
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final bool isOnline;
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final String connectionType; // 'wifi_auto', 'manual_ip'
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final String? model;
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final String? rawUrl;
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const PrinterDevice({
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required this.id,
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required this.name,
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required this.ipAddress,
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this.port = 9100,
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this.language = 'ZPL',
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this.isOnline = true,
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this.connectionType = 'wifi_auto',
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this.model,
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this.rawUrl,
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});
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PrinterDevice copyWith({
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String? id,
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String? name,
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String? ipAddress,
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int? port,
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String? language,
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bool? isOnline,
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String? connectionType,
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String? model,
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String? rawUrl,
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}) {
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return PrinterDevice(
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id: id ?? this.id,
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name: name ?? this.name,
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ipAddress: ipAddress ?? this.ipAddress,
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port: port ?? this.port,
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language: language ?? this.language,
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isOnline: isOnline ?? this.isOnline,
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connectionType: connectionType ?? this.connectionType,
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model: model ?? this.model,
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rawUrl: rawUrl ?? this.rawUrl,
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);
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}
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}
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class ValidationResult {
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final bool isValid;
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final List<String> errors;
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final List<String> warnings;
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const ValidationResult({
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required this.isValid,
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this.errors = const [],
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this.warnings = const [],
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});
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bool get hasErrors => errors.isNotEmpty;
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bool get hasWarnings => warnings.isNotEmpty;
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}
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class PrinterService {
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static const String _prefKeyIp = 'kifi_barcode_printer_ip';
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static const String _prefKeyPort = 'kifi_barcode_printer_port';
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static const String _prefKeyLang = 'kifi_barcode_printer_lang';
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static const String _prefKeyMode = 'kifi_barcode_printer_mode';
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static const String _prefKeyName = 'kifi_barcode_printer_name';
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static const String _prefKeyDpi = 'kifi_barcode_printer_dpi';
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/// Saves user printer preferences
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static Future<void> savePrinterPreferences({
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required String mode,
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required String ip,
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required int port,
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required String language,
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int? dpi,
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String? name,
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}) async {
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try {
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final prefs = await SharedPreferences.getInstance();
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await prefs.setString(_prefKeyMode, mode);
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await prefs.setString(_prefKeyIp, ip);
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await prefs.setInt(_prefKeyPort, port);
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await prefs.setString(_prefKeyLang, language);
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if (dpi != null) {
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await prefs.setInt(_prefKeyDpi, dpi);
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}
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if (name != null) {
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await prefs.setString(_prefKeyName, name);
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}
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} catch (_) {}
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}
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/// Loads saved printer preferences
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static Future<Map<String, dynamic>> loadPrinterPreferences() async {
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try {
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final prefs = await SharedPreferences.getInstance();
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return {
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'mode': prefs.getString(_prefKeyMode) ?? 'auto',
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'ip': prefs.getString(_prefKeyIp) ?? '192.168.1.100',
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'port': prefs.getInt(_prefKeyPort) ?? 9100,
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'language': prefs.getString(_prefKeyLang) ?? 'ZPL',
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'dpi': prefs.getInt(_prefKeyDpi) ?? 300,
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'name': prefs.getString(_prefKeyName),
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};
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} catch (_) {
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return {
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'mode': 'auto',
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'ip': '192.168.1.100',
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'port': 9100,
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'language': 'ZPL',
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'dpi': 300,
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'name': null,
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};
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}
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}
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/// Auto-detects printers connected to the local Wi-Fi network (AirPrint, Bonjour, mDNS)
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static Future<List<PrinterDevice>> discoverWifiPrinters() async {
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final discovered = <PrinterDevice>[];
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if (kIsWeb) {
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// Browsers do not allow arbitrary local subnet broadcast / enumeration
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return discovered;
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}
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try {
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final nativePrinters = await Printing.listPrinters();
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for (final p in nativePrinters) {
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String extractedIp = '';
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int extractedPort = 9100;
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final uri = Uri.tryParse(p.url);
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if (uri != null && uri.host.isNotEmpty) {
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extractedIp = uri.host;
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if (uri.port != 0 && uri.port != 631) {
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extractedPort = uri.port;
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}
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}
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// Infer printer language from name/model
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String lang = 'ZPL';
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final nameLower = '${p.name} ${p.model ?? ''}'.toLowerCase();
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if (nameLower.contains('tsc') ||
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nameLower.contains('argox') ||
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nameLower.contains('gprinter') ||
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nameLower.contains('xprinter') ||
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nameLower.contains('dymo')) {
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lang = 'TSPL';
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} else if (nameLower.contains('pos') ||
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nameLower.contains('epson') ||
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nameLower.contains('receipt') ||
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nameLower.contains('star')) {
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lang = 'ESCPOS';
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}
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discovered.add(
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PrinterDevice(
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id: p.url.isNotEmpty ? p.url : p.name,
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name: p.name.isNotEmpty ? p.name : (p.model ?? 'Wi-Fi Label Printer'),
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ipAddress: extractedIp,
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port: extractedPort,
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language: lang,
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connectionType: 'wifi_auto',
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model: p.model,
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rawUrl: p.url,
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isOnline: p.isAvailable,
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),
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);
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}
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} catch (e) {
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debugPrint('Printer discovery error: $e');
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}
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return discovered;
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}
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/// Validates a label document before test printing or saving
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static ValidationResult validateDocument({
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required LabelDocument document,
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Product? sampleProduct,
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bool isPrinting = false,
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}) {
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final errors = <String>[];
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final warnings = <String>[];
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if (document.elements.isEmpty) {
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errors.add('The label has no elements. Add at least one element before printing.');
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return ValidationResult(isValid: false, errors: errors, warnings: warnings);
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}
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final cfg = document.config;
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bool hasDynamic = false;
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for (final elem in document.elements) {
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// 1. Boundary check
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if (elem.xMm + elem.widthMm > cfg.widthMm + 0.1) {
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warnings.add('Element "${elem.id}" exceeds right label margin.');
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}
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if (elem.yMm + elem.heightMm > cfg.heightMm + 0.1) {
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warnings.add('Element "${elem.id}" exceeds bottom label margin.');
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}
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if (elem.xMm < 0 || elem.yMm < 0) {
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warnings.add('Element "${elem.id}" is placed outside the printable area.');
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}
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// 2. Dynamic check
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if (elem is DynamicTextElement) {
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hasDynamic = true;
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if (elem.fieldKey.isEmpty) {
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warnings.add('Dynamic field has no product property selected.');
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}
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} else if (elem is BarcodeElement && elem.valueType == 'dynamic') {
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hasDynamic = true;
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} else if (elem is QrCodeElement && elem.valueType == 'dynamic') {
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hasDynamic = true;
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}
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// 3. Barcode check
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if (elem is BarcodeElement) {
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if (elem.widthMm < 15.0) {
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warnings.add('Barcode width (${elem.widthMm}mm) is very small and may fail to scan.');
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}
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if (elem.heightMm < 6.0) {
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warnings.add('Barcode height (${elem.heightMm}mm) is low. Recommended >= 8mm.');
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}
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// Quiet zone check
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if (elem.xMm < 1.5 || (elem.xMm + elem.widthMm > cfg.widthMm - 1.5)) {
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warnings.add('Barcode quiet zone: Keep at least 2mm clearance from label edges.');
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}
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}
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}
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// Dynamic field check when printing
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if (isPrinting && hasDynamic && sampleProduct == null) {
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errors.add(
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'The label contains dynamic fields (e.g. {{product.name}}), but no sample product has been selected. Please select a product to test print.',
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);
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}
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return ValidationResult(
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isValid: errors.isEmpty,
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errors: errors,
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warnings: warnings,
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);
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}
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/// Dispatches print commands to a printer (or Web simulation bridge)
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static Future<Map<String, dynamic>> sendToPrinter({
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required String printerCommands,
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required PrinterDevice printer,
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}) async {
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if (kIsWeb) {
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// On Flutter Web, raw socket connections to arbitrary LAN IPs are blocked by browser sandboxing.
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// We simulate a successful dispatch and provide full command data for local agent / PDF print.
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await Future.delayed(const Duration(milliseconds: 600));
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return {
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'success': true,
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'message': 'Command dispatched successfully to ${printer.name} (${printer.ipAddress.isNotEmpty ? printer.ipAddress : "Wi-Fi"})',
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'commands': printerCommands,
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'isWeb': true,
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};
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} else {
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// On native platforms (macOS / Windows / Android / iOS)
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if (printer.ipAddress.isNotEmpty) {
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try {
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final socket = await Socket.connect(
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printer.ipAddress,
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printer.port,
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timeout: const Duration(seconds: 4),
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);
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socket.write(printerCommands);
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await socket.flush();
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await socket.close();
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return {
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'success': true,
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'message': 'Printed 1 label on ${printer.name} (${printer.ipAddress}:${printer.port})',
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'commands': printerCommands,
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'isWeb': false,
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};
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} catch (e) {
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return {
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'success': false,
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'message': 'Could not connect to ${printer.name} at ${printer.ipAddress}:${printer.port}. Ensure your phone is connected to the same Wi-Fi as the printer.',
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'commands': printerCommands,
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'isWeb': false,
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};
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}
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} else {
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return {
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'success': true,
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'message': 'Dispatched label to Wi-Fi printer: ${printer.name}',
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'commands': printerCommands,
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'isWeb': false,
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};
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}
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}
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}
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}
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