import 'package:esc_pos_utils_plus/esc_pos_utils_plus.dart';
import 'package:print_bluetooth_thermal/print_bluetooth_thermal.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../models/sale.dart';
import '../utils/format.dart';

class PrinterService {
  static const String _printerKey = 'selected_printer_mac';

  String? _connectedMac;
  bool _isConnected = false;

  String? get connectedMac => _connectedMac;
  bool get isConnected => _isConnected;

  Future<void> init() async {
    final prefs = await SharedPreferences.getInstance();
    _connectedMac = prefs.getString(_printerKey);
    if (_connectedMac != null) {
      await connect(_connectedMac!);
    }
  }

  Future<bool> isBluetoothEnabled() async {
    return PrintBluetoothThermal.bluetoothEnabled;
  }

  Future<List<BluetoothInfo>> getPairedDevices() async {
    final list = await PrintBluetoothThermal.pairedBluetooths;
    return list;
  }

  Future<bool> connect(String mac) async {
    try {
      final connected = await PrintBluetoothThermal.connect(macPrinterAddress: mac);
      _isConnected = connected;
      if (connected) {
        _connectedMac = mac;
        final prefs = await SharedPreferences.getInstance();
        await prefs.setString(_printerKey, mac);
      }
      return connected;
    } catch (_) {
      _isConnected = false;
      return false;
    }
  }

  Future<void> disconnect() async {
    try {
      await PrintBluetoothThermal.disconnect;
    } catch (_) {}
    _isConnected = false;
  }

  Future<void> forgetPrinter() async {
    _connectedMac = null;
    _isConnected = false;
    final prefs = await SharedPreferences.getInstance();
    await prefs.remove(_printerKey);
  }

  Future<List<int>> _buildReceiptBytes(Sale sale, String storeName, {String? kasirName, String? whatsapp, String? notes}) async {
    final profile = await CapabilityProfile.load();
    final generator = Generator(PaperSize.mm58, profile);
    final bytes = <int>[];

    bytes.addAll(generator.text(
      storeName,
      styles: const PosStyles(
        align: PosAlign.center,
        bold: true,
        height: PosTextSize.size2,
      ),
    ));
    bytes.addAll(generator.text(
      formatTanggal(sale.date),
      styles: const PosStyles(align: PosAlign.center),
    ));
    bytes.addAll(generator.text(
      formatWaktu(sale.date),
      styles: const PosStyles(align: PosAlign.center),
    ));
    bytes.addAll(generator.text(
      '#${sale.id.toUpperCase()}',
      styles: const PosStyles(align: PosAlign.center),
    ));
    bytes.addAll(generator.hr());

    for (final it in sale.items) {
      bytes.addAll(generator.text('${it.name}  x${it.qty}',
          styles: const PosStyles(bold: true)));
      bytes.addAll(generator.row([
        PosColumn(
          text: formatRupiah(it.price),
          width: 6,
        ),
        PosColumn(
          text: formatRupiah(it.subtotal),
          width: 6,
          styles: const PosStyles(align: PosAlign.right),
        ),
      ]));
    }

    bytes.addAll(generator.hr());
    if (sale.discount > 0) {
      bytes.addAll(generator.row([
        PosColumn(text: 'Diskon', width: 6),
        PosColumn(
          text: '-${formatRupiah(sale.discount)}',
          width: 6,
          styles: const PosStyles(align: PosAlign.right),
        ),
      ]));
    }
    bytes.addAll(generator.row([
      PosColumn(
        text: 'TOTAL',
        width: 6,
        styles: const PosStyles(bold: true),
      ),
      PosColumn(
        text: formatRupiah(sale.total),
        width: 6,
        styles: const PosStyles(bold: true, align: PosAlign.right),
      ),
    ]));
    final methodLabel = sale.paymentMethod == 'transfer'
        ? 'Bank'
        : sale.paymentMethod == 'qris'
            ? 'QRIS'
            : sale.paymentMethod == 'split'
                ? 'Split Payment'
                : 'Tunai';
    bytes.addAll(generator.row([
      PosColumn(text: 'Metode', width: 6),
      PosColumn(
        text: methodLabel,
        width: 6,
        styles: const PosStyles(align: PosAlign.right),
      ),
    ]));
    if (sale.paymentMethod == 'tunai') {
      bytes.addAll(generator.row([
        PosColumn(text: 'Bayar', width: 6),
        PosColumn(
          text: formatRupiah(sale.paid),
          width: 6,
          styles: const PosStyles(align: PosAlign.right),
        ),
      ]));
      bytes.addAll(generator.row([
        PosColumn(text: 'Kembali', width: 6),
        PosColumn(
          text: formatRupiah(sale.change),
          width: 6,
          styles: const PosStyles(align: PosAlign.right),
        ),
      ]));
    }
    if (sale.splitPayment != null && sale.splitPayment!.isNotEmpty) {
      for (final entry in sale.splitPayment!.entries) {
        final label = entry.key == 'tunai'
            ? 'Tunai'
            : entry.key == 'transfer'
                ? 'Transfer'
                : 'QRIS';
        bytes.addAll(generator.row([
          PosColumn(text: 'Split $label', width: 6),
          PosColumn(
            text: formatRupiah(entry.value),
            width: 6,
            styles: const PosStyles(align: PosAlign.right),
          ),
        ]));
      }
    }
    if (kasirName != null && kasirName.isNotEmpty) {
      bytes.addAll(generator.text('Kasir: $kasirName',
          styles: const PosStyles(align: PosAlign.center)));
    }
    if (whatsapp != null && whatsapp.isNotEmpty) {
      bytes.addAll(generator.text('WA: $whatsapp',
          styles: const PosStyles(align: PosAlign.center)));
    }
    if (notes != null && notes.trim().isNotEmpty) {
      final noteLines = notes.trim().split('\n');
      for (final line in noteLines) {
        final text = line.trim();
        if (text.isEmpty) continue;
        bytes.addAll(generator.text(text,
            styles: const PosStyles(align: PosAlign.center)));
      }
    }
    bytes.addAll(generator.text(
      'Terima kasih!',
      styles: const PosStyles(align: PosAlign.center),
    ));
    bytes.addAll(generator.cut());
    return bytes;
  }

  Future<String?> printSale(Sale sale, String storeName, {String? kasirName, String? whatsapp, String? notes}) async {
    if (!_isConnected || _connectedMac == null) {
      return 'Printer belum terhubung';
    }
    try {
      final bytes = await _buildReceiptBytes(sale, storeName, kasirName: kasirName, whatsapp: whatsapp, notes: notes);
      final result = await PrintBluetoothThermal.writeBytes(bytes);
      if (result) return null;
      return 'Gagal mengirim ke printer';
    } catch (e) {
      return e.toString();
    }
  }
}

final printerService = PrinterService();