/// <summary>
/// Adds a line to the sale.
/// </summary>
/// <param name="inputLine">The line to add.</param>
/// <returns>True for success, False for failure. Failures are usually caused via incorrect formatting of the input</returns>
public bool Add(string inputLine)
{
SaleLine saleLine = InputParser.ProcessInput(inputLine);
if (saleLine == null)
{
return(false);
}
saleLines.Add(saleLine);
totalTax += saleLine.Tax;
totalValue += saleLine.LineValue;
return(true);
}
// Assumes that all input is in the format:
// <qty> <product> at <price>
//
// If <product> contains the word imported then the product is deemed to attract import tax
//
// If it can't be parsed we return null.
// If it can then we return a sales line, complete with tax information calculated.
public static SaleLine ProcessInput(string input)
{
int quantity;
string productName;
decimal price;
bool isImported;
SaleLine saleLine;
if (string.IsNullOrEmpty(input))
{
return(null);
}
string[] words = input.Split(' ');
int wordCount = words.Length;
// must have at least 4 words
if (wordCount < 4)
{
return(null);
}
// get quantity (first word)
try
{
quantity = int.Parse(words[0]);
}
catch (FormatException)
{
return(null);
}
catch (OverflowException)
{
return(null);
}
// get price (last word in input string)
try
{
price = decimal.Parse(words[wordCount - 1]);
}
catch (FormatException)
{
return(null);
}
catch (OverflowException)
{
return(null);
}
productName = string.Join(" ", words, 1, wordCount - 1);
if (string.IsNullOrEmpty(productName))
{
return(null);
}
//Check if this is an imported product
isImported = productName.Contains("imported ");
if (isImported)
{
//Ensure the word imported appears at the front of the description
productName = "imported " + productName.Replace("imported ", string.Empty);
}
// create the sale line
saleLine = new SaleLine(quantity, productName, price, isImported);
return(saleLine);
}