Operational Cost Print Format

main.dart

import 'dart:core';
import 'package:intl/intl.dart';


void main() {
   Outlet outlet = dummyOutlet();
  Employee employee = Employee(
    name: 'Jane Doe',
  );
  OperationalCostEntity opCost = generateDummyOperationalCosts()[0];
  String report = getOperationalCostFormat(opCost, outlet, employee);
  print(report);
}

String getOperationalCostFormat(
    OperationalCostEntity operationalCost,
    Outlet outlet,
    Employee employee,
    {int paperSize = 58}
) {

  StringBuffer teks = StringBuffer();
  StringBuffer header = StringBuffer(Constant.PRINTER_CODE_LOGO);
  final int MAX = getMaxCharacter(paperSize);

  header.writeln(outlet.name.center(MAX));
  header.writeln(outlet.receiptAddress?.center(MAX));
  if(outlet.receiptPhone != null) {
    header.writeln(outlet.receiptPhone!.center(MAX));
  }  
  header.writeln("=".loop(MAX));

  String bankName = operationalCost.bankName ?? "";

  teks.writeln("Supplier   : ${operationalCost.supplierName}".width(MAX));
  teks.writeln("Tanggal    : ${operationalCost.timeCreated?.dateTimeFormat()}".width(MAX));
  teks.writeln("Kasir      : ${employee.name}".width(MAX));
  teks.writeln("Pembayaran : ${operationalCost.payment} $bankName".width(MAX));
  teks.writeln();

  teks.write(operationalCost.opcostName?.width(MAX - 4 - 8));
  teks.write(operationalCost.qty.toCurrency().width(4));
  teks.writeln(operationalCost.total.toCurrency().width(8));

  teks.write("\npowered by www.uniq.id\n\n");

  return header.toString() + teks.toString();
}

List<OperationalCostEntity> generateDummyOperationalCosts() {
  return List.generate(5, (index) {
    return OperationalCostEntity(
      id: index + 1,
      opcostName: 'Operational Cost ${index + 1}',
      total: (1000 * (index + 1)).toInt(),
      payment: 'Payment Method ${index + 1}',
      qty: (index + 1) * 2,
      supplierName: 'Supplier ${index + 1}',
      timeCreated: DateTime.now().millisecondsSinceEpoch,
      bankName: 'Bank ${index + 1}',
    );
  });
}

int getMaxCharacter(int? paperSize) {
  switch (paperSize) {
    case 75:
      return 40;
    case 80:
      return 48;
    default:
      return 32;
  }
}


extension IntExtension on int? {
  String toCurrency({String prefix = ''}) {
    var num = NumberFormat.decimalPattern();
    try {
      return prefix + num.format(this ?? 0);
    } catch (e) {
      return '${prefix}0';
    }
  }

  String dateTimeFormat([String? format]) {
    final DateFormat sdf = DateFormat(format ?? 'dd-MM-yyyy HH:mm');
    return sdf.format(DateTime.fromMillisecondsSinceEpoch(this ?? 0));
  }
}

extension StringExtensions on String {
  String safeRepeat(int? count) {
    return count != null && count > 0 ? this * count : '';
  }

  String loop(int w) {
    var newVal = '';
    for (var i = 0; i < w; i++) {
      newVal += this;
    }
    return newVal;
  }

  String width(int width, {int max = 32, int before = 0}) {
    try {
      var cursor = 0;
      var wordSplit = StringBuffer();
      do {
        var suffix = '';
        var start = cursor;
        var end = (start + width) < length ? start + width : length;
        var cutWord = substring(start, end);
        var lastSpace = cutWord.contains(' ') && end != length
            ? cutWord.lastIndexOf(' ')
            : cutWord.length;

        if (lastSpace < (width ~/ 2) && (width - 1) < cutWord.length) {
          lastSpace = width - 1;
          cursor--;
          suffix = '-';
        }

        cursor += lastSpace + 1;
        suffix += cursor < length
            ? ' '.padRight(max - (before + lastSpace)) + '\n'
            : ' '.padRight(width - (before + lastSpace));

        wordSplit.write(cutWord.substring(0, lastSpace) + suffix);
      } while (cursor < length);

      return wordSplit.toString();
    } catch (e) {
      // Handle error
    }

    // Fallback logic
    return padRight(width);
  }

  String widthRight(int w) {
    return padLeft(w);
  }

  String center(int width, [String flanks = ' ']) {
    if (length == width) {
      return this;
    } else if (length < width) {
      var center = width ~/ 2;
      var flank = center - (length ~/ 2);

      var newValue = StringBuffer();
      for (var i = 0; i < flank; i++) {
        newValue.write(flanks);
      }
      newValue.write(this);

      for (var i = newValue.length; i < width; i++) {
        newValue.write(flanks);
      }
      return newValue.toString();
    } else {
      // Handle case where length > width
    }

    return '';
  }
}

class Constant {
  static const String PRINTER_CODE_LOGO = "[CUT]";
}

class OperationalCostEntity {
  final int id;
  final String opcostName;
  final int total;
  final String? supplierName;
  final int? timeCreated;
  final String payment;
  final String? bankName;
  final int qty;

  OperationalCostEntity({
    required this.id,
    required this.opcostName,
    required this.total,
    required this.payment,
    required this.qty,
    this.supplierName,
    this.timeCreated,
    this.bankName,
  });

  factory OperationalCostEntity.fromJson(Map<String, dynamic> json) {
    return OperationalCostEntity(
      id: json['id'] as int,
      opcostName: json['opcostName'] as String,
      total: json['total'] as int,
      payment: json['payment'] as String,
      qty: json['qty'] as int,
      supplierName: json['supplierName'] as String?,
      timeCreated: json['timeCreated'] as int?,
      bankName: json['bankName'] as String?,
    );
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = <String, dynamic>{};
    data['id'] = id;
    data['opcostName'] = opcostName;
    data['total'] = total;
    data['payment'] = payment;
    data['qty'] = qty;
    data['supplierName'] = supplierName;
    data['timeCreated'] = timeCreated;
    data['bankName'] = bankName;
    return data;
  }
}

class Outlet {
  String name;
  String? receiptAddress;
  String? receiptPhone;
  String? receiptNote;
  String? receiptSocialmedia;

  Outlet({
    required this.name,
    this.receiptAddress,
    this.receiptPhone,
    this.receiptNote,
    this.receiptSocialmedia,
  });
}

// Employee model
class Employee {
  String name;

  Employee({
    required this.name,
  });
}

Outlet dummyOutlet() {
  return Outlet(
    name: 'Outlet ABC',
    receiptAddress: '123 Main Street',
    receiptPhone: '123-456-7890',
    receiptNote: 'Thank you for your visit!',
    receiptSocialmedia: '@OutletABC',
  );
}