import 'package:flutter/services.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:intl/intl.dart';
import 'package:cashumit/models/receipt_item.dart';
import 'package:flutter_esc_pos_utils/flutter_esc_pos_utils.dart';
import 'package:image/image.dart' as img;
import 'dart:io';

/// Service untuk menghasilkan perintah ESC/POS menggunakan flutter_esc_pos_utils
class EscPosPrintService {
  /// Menghasilkan struk dalam format byte array berdasarkan data transaksi
  static Future<List<int>> generateEscPosBytes({
    required List<ReceiptItem> items,
    required DateTime transactionDate,
    required String cashierId,
    required String transactionId,
  }) async {
    print('Memulai generateEscPosBytes...');
    print('Jumlah item: ${items.length}');
    print('Tanggal transaksi: $transactionDate');
    print('ID kasir: $cashierId');
    print('ID transaksi: $transactionId');
    
    // Load store info from shared preferences
    final prefs = await SharedPreferences.getInstance();
    final storeName = prefs.getString('store_name') ?? 'TOKO SEMBAKO MURAH';
    final storeAddress = prefs.getString('store_address') ?? 'Jl. Merdeka No. 123';
    final adminName = prefs.getString('admin_name') ?? 'Budi Santoso';
    final adminPhone = prefs.getString('admin_phone') ?? '08123456789';
    final logoPath = prefs.getString('store_logo_path'); // Load logo path
    
    print('Nama toko: $storeName');
    print('Alamat toko: $storeAddress');
    print('Nama admin: $adminName');
    print('Telepon admin: $adminPhone');
    print('Logo path: $logoPath');
    
    // Format tanggal
    final dateFormatter = DateFormat('dd/MM/yyyy HH:mm');
    final formattedDate = dateFormatter.format(transactionDate);
    print('Tanggal yang diformat: $formattedDate');
    
    // Format angka ke rupiah
    String formatRupiah(double amount) {
      final formatter = NumberFormat("#,##0", "id_ID");
      return "Rp ${formatter.format(amount)}";
    }
    
    // Load capability profile
    final profile = await CapabilityProfile.load();
    final generator = Generator(PaperSize.mm58, profile);
    
    // Mulai dengan inisialisasi printer
    List<int> bytes = [];
    
    // Tambahkan logo jika ada path-nya
    if (logoPath != null && logoPath.isNotEmpty) {
      try {
        // Membaca file gambar dari path lokal
        final file = File(logoPath);
        if (await file.exists()) {
          final Uint8List imageBytes = await file.readAsBytes();
          
          // Decode gambar (format yang didukung: JPEG, PNG)
          final img.Image? image = img.decodeImage(imageBytes);
          if (image != null) {
            bytes += generator.image(image);
          }
        } else {
          throw Exception('File logo tidak ditemukan');
        }
      } catch (e) {
        print('Gagal memuat logo: $e');
        // Jika gagal memuat logo, gunakan teks sebagai fallback
        bytes += generator.text(storeName,
            styles: PosStyles(
              bold: true,
              height: PosTextSize.size1,
              width: PosTextSize.size1,
              align: PosAlign.center,
            ));
      }
    } else {
      // Jika tidak ada logo, gunakan nama toko sebagai header
      bytes += generator.text(storeName,
          styles: PosStyles(
            bold: true,
            height: PosTextSize.size1,
            width: PosTextSize.size1,
            align: PosAlign.center,
          ));
    }
    
    bytes += generator.text(storeAddress,
        styles: PosStyles(align: PosAlign.center));
    bytes += generator.text('Admin: $adminName',
        styles: PosStyles(align: PosAlign.center));
    bytes += generator.text('Telp: $adminPhone',
        styles: PosStyles(align: PosAlign.center));
    bytes += generator.text('$formattedDate',
        styles: PosStyles(align: PosAlign.center));
    
    bytes += generator.feed(1);
    
    // Garis pemisah
    bytes += generator.text('================================',
        styles: PosStyles(align: PosAlign.center));
    
    // Informasi transaksi
    bytes += generator.text('Kasir: $cashierId',
        styles: PosStyles(bold: true));
    bytes += generator.text('ID Transaksi: $transactionId',
        styles: PosStyles());
    
    bytes += generator.feed(1);
    
    // Garis pemisah
    bytes += generator.text('================================',
        styles: PosStyles(align: PosAlign.center));
    
    // Tabel item
    bytes += generator.row([
      PosColumn(
        text: 'Item',
        width: 7,
        styles: PosStyles(bold: true, align: PosAlign.left),
      ),
      PosColumn(
        text: 'Total',
        width: 5,
        styles: PosStyles(bold: true, align: PosAlign.right),
      ),
    ]);
    
    // Item list
    print('Memulai iterasi item...');
    for (int i = 0; i < items.length; i++) {
      var item = items[i];
      print('Item $i: ${item.description}, qty: ${item.quantity}, price: ${item.price}, total: ${item.total}');
      
      // Untuk item dengan detail kuantitas dan harga
      bytes += generator.row([
        PosColumn(
          text: item.description,
          width: 12,
          styles: PosStyles(align: PosAlign.left),
        ),
      ]);
      
      bytes += generator.row([
        PosColumn(
          text: '${item.quantity} x ${formatRupiah(item.price)}',
          width: 7,
          styles: PosStyles(align: PosAlign.left, height: PosTextSize.size1, width: PosTextSize.size1),
        ),
        PosColumn(
          text: formatRupiah(item.total),
          width: 5,
          styles: PosStyles(align: PosAlign.right),
        ),
      ]);
    }
    print('Selesai iterasi item');
    
    // Garis pemisah sebelum total
    bytes += generator.text('--------------------------------',
        styles: PosStyles(align: PosAlign.center));
    
    // Total
    final totalAmount = items.fold(0.0, (sum, item) => sum + item.total);
    print('Total amount: $totalAmount');
    
    bytes += generator.row([
      PosColumn(
        text: 'TOTAL',
        width: 7,
        styles: PosStyles(bold: true, align: PosAlign.left),
      ),
      PosColumn(
        text: formatRupiah(totalAmount),
        width: 5,
        styles: PosStyles(bold: true, align: PosAlign.right),
      ),
    ]);
    
    // Garis pemisah setelah total
    bytes += generator.text('================================',
        styles: PosStyles(align: PosAlign.center));

    // Memuat teks kustom dari shared preferences
    final customDisclaimer = prefs.getString('store_disclaimer_text') ?? 
        'Barang yang sudah dibeli tidak dapat dikembalikan/ditukar. '
        'Harap periksa kembali struk belanja Anda sebelum meninggalkan toko.';
    final customThankYou = prefs.getString('thank_you_text') ?? '*** TERIMA KASIH ***';
    final customPantun = prefs.getString('pantun_text') ?? 
        'Belanja di toko kami, hemat dan nyaman,\n'
        'Dengan penuh semangat, kami siap melayani,\n'
        'Harapan kami, Anda selalu puas,\n'
        'Sampai jumpa lagi, selamat tinggal.';

    // Menambahkan disclaimer
    bytes += generator.feed(1);
    
    // Memecah disclaimer menjadi beberapa baris jika terlalu panjang
    final disclaimerLines = customDisclaimer.split(' ');
    final List<String> wrappedDisclaimer = [];
    String currentLine = '';

    for (final word in disclaimerLines) {
      if ((currentLine + word).length > 32) {
        wrappedDisclaimer.add(currentLine.trim());
        currentLine = word + ' ';
      } else {
        currentLine += word + ' ';
      }
    }
    if (currentLine.trim().isNotEmpty) {
      wrappedDisclaimer.add(currentLine.trim());
    }

    for (final line in wrappedDisclaimer) {
      bytes += generator.text(line,
          styles: PosStyles(align: PosAlign.center));
    }

    // Menambahkan ucapan terima kasih
    bytes += generator.feed(1);
    bytes += generator.text(customThankYou,
        styles: PosStyles(align: PosAlign.center, bold: true));

    // Menambahkan pantun
    bytes += generator.feed(1);
    final pantunLines = customPantun.split('\n');
    for (final line in pantunLines) {
      bytes += generator.text(line,
          styles: PosStyles(align: PosAlign.center));
    }

    // Spasi di akhir dan pemotongan kertas
    bytes += generator.feed(2);
    bytes += generator.cut();
    
    print('Jumlah byte yang dihasilkan: ${bytes.length}');
    
    return bytes;
  }
}