86 lines
2.3 KiB
C#
86 lines
2.3 KiB
C#
namespace Supermarket;
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public abstract class Product
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{
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public const char Separator = ';';
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public const string Invalid = "Invalid!";
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protected Product(string productName, string barcode, int quantity)
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{
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if (string.IsNullOrWhiteSpace(productName))
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{
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productName = Invalid;
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}
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ProductName = productName;
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Barcode = IsBarcodeValid(barcode) ? barcode : Invalid;
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Quantity = quantity > 0 ? quantity : 0;
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}
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public string ProductName { get; }
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public string Barcode { get; }
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public int Quantity { get; }
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protected virtual string[] CsvColumnNames => [nameof(Barcode), nameof(ProductName), nameof(Quantity)];
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protected virtual string[] CsvColumnValues => [Barcode, ProductName, Quantity.ToString()];
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public string GetCsvHeader() => string.Join(Separator, CsvColumnNames);
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public string ToCsv() => ToCsvLine(CsvColumnValues, Separator);
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protected static string ToCsvLine(string[] values, char separator) => String.Join(separator, values);
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public static bool IsBarcodeValid(string? barcode)
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{
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if (barcode == null)
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{
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return false;
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}
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if(barcode.Length is > 8 or < 8)
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{
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return false;
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}
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const int evenWeight = 3;
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const int oddWeight = 1;
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int weight = 0;
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for (int i = 0; i < barcode.Length; i++)
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{
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if (!char.IsDigit(barcode[i]))
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{
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return false;
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}
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// Skip check digit
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if (i == 7)
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{
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break;
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}
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int digit = int.Parse(barcode[i].ToString());
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weight += i % 2 == 0 ? digit * evenWeight : digit * oddWeight;
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}
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int calculatedCheckDigit = 10 - (weight % 10);
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if (calculatedCheckDigit == 10)
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{
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calculatedCheckDigit = 0;
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}
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return calculatedCheckDigit == int.Parse(barcode[^1].ToString());
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}
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protected static T[] AppendToArray<T>(T[] existingArray, params T[] newValues)
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{
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// we are allowed to use Lists, so why not? :)
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List<T> result = new(existingArray.Length + newValues.Length);
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result.AddRange(existingArray);
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result.AddRange(newValues);
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return result.ToArray();
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}
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}
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