/// <summary>
/// Invokes the commands, based on user's input.
/// </summary>
public void InvokeCommands()
{
var commandsQueue = new List <ICommand>();
Console.WriteLine(
"Input a chain of commands in the following format:\n<action> <vehicle_type>"
+ "\nActions:\n 1) count_types\n 2) count_all\n 3) average_price truck\n 4) average_price truck <brand>"
+ "\nVehicle types:\n 1) car\n 2) truck"
+ "\nFinish with <execute> command.\n");
while (true)
{
var command = Console.ReadLine().ToLower();
if (command == string.Empty)
{
continue;
}
if (command == "execute")
{
break;
}
var commandKeyWords = command.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
const int CommandActionKeyIndex = 0;
const int CommandVehicleKeyIndex = 1;
const int CommandBrandKeyStartIndex = 2;
const int MinimumAmountOfArgs = 2;
var commandActionKey = commandKeyWords[CommandActionKeyIndex];
if (commandKeyWords.Length < MinimumAmountOfArgs)
{
Console.WriteLine("A command must contain at least two arguments: type of command, type of vehicle, (optional for average_price) brand of vehicle");
continue;
}
// Determine the type of vehicle to process
var commandVehicleKey = commandKeyWords[CommandVehicleKeyIndex];
List <VehicleInfoStruct> listToProcess;
switch (commandVehicleKey)
{
case "car":
listToProcess = DatabaseCars.GetDatabaseCars(this.CarsXDoc).ListOfCars;
break;
case "truck":
listToProcess = DatabaseTrucks.GetDatabaseTrucks(this.TrucksXDoc).ListOfTrucks;
break;
default:
Console.WriteLine("Unknown vehicle type");
continue;
}
// Determine the action to perform
switch (commandActionKey)
{
case "count_types":
commandsQueue.Add(new CommandCountBrands(new CounterBrands(), listToProcess));
break;
case "count_all":
commandsQueue.Add(new CommandCountAllVehicles(new CounterAllVehicles(), listToProcess));
break;
case "average_price":
// If a brand is entered, run the necessary command
if (commandKeyWords.Length > MinimumAmountOfArgs)
{
// Create a joined string in case of brand having multiple words
var commandBrandKey = commandKeyWords.Length > MinimumAmountOfArgs + 1
? string.Join(" ", commandKeyWords, CommandBrandKeyStartIndex, commandKeyWords.Length - MinimumAmountOfArgs)
: commandKeyWords[CommandBrandKeyStartIndex];
// Check if the brand exists in the database
if (listToProcess.Any(vehicle => vehicle.Brand == commandBrandKey))
{
commandsQueue.Add(
new CommandCountAveragePriceOfBrand(
new CounterAveragePriceOfBrand(),
listToProcess,
commandBrandKey));
}
else
{
Console.WriteLine("Unknown brand");
}
}
else
{
// If no brand is entered, run the usual command
commandsQueue.Add(new CommandCountAveragePrice(new CounterAveragePrice(), listToProcess));
}
break;
default:
Console.WriteLine("Unknown command");
break;
}
break;
}
foreach (var command in commandsQueue)
{
Console.WriteLine(command.Execute());
}
}
/// <summary> /// Returns the instance of the class, or creates it if it doesn't exist /// </summary> /// <param name="xDoc"> /// XML doc with trucks info. /// </param> /// <returns> /// The <see cref="DatabaseTrucks"/>. /// </returns> public static DatabaseTrucks GetDatabaseTrucks(XDocument xDoc) => instance ?? (instance = new DatabaseTrucks(xDoc));
