/// <buyDrugs>
/// This method takes from the console information for a drug purchase.
/// (existing drug name, drug quantity)
/// It increases the quantity on the specified drug from the database with the specified quantity,
/// and decreases the balance with the acquire price of the drug multiplied by the selected quantity.
/// </buyDrugs>
public void BuyDrugs()
{
Drug drug;
int quantity;
try
{
Dictionary <string, string> dict = CommandReader.Buy();
if (dict["drugName"] == "" || dict["quantity"] == "")
{
throw new InvalidOperationException(ConstantStrings.Blank);
}
OutputPrinter.Connecting();
try
{
drug = c.Drugs.Single(e => e.Name == dict["drugName"]);
}
catch (Exception)
{
throw new InvalidOperationException(ConstantStrings.Drug + $" with name '{dict["drugName"]}' " + ConstantStrings.NotFound);
}
try
{
quantity = int.Parse(dict["quantity"]);
}
catch (Exception)
{
throw new InvalidOperationException(ConstantStrings.Quantity + " " + ConstantStrings.ValidNumber);
}
if (quantity <= 0)
{
throw new InvalidOperationException(ConstantStrings.Quantity + " " + ConstantStrings.PositiveNumber);
}
double price = drug.Acquire_Price * quantity;
if (price > money.Money_Amount)
{
throw new InvalidOperationException(ConstantStrings.NotEnough + " " + ConstantStrings.Money.ToLower() + "!");
}
money.Money_Amount -= price;
Buy(drug, quantity);
OutputPrinter.Done();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
OutputPrinter.InvalidCommand();
}
}