/// <summary>
/// Updates the population of a valid city if one is found and the new population is
/// different than the current population. Updates both the related CityInfo object
/// as well as the file containing the city information specified by the user.
/// </summary>
/// <param name="cityName">The city to be found</param>
/// <param name="population">The population to change it to</param>
/// <param name="fileName">The file to alter</param>
public void UpdatePopulation(string cityName, ulong population, string fileName)
{
try
{
CityInfo cityToUpdate = GetSpecificCity(cityName);
if (cityToUpdate != null)
{
if (cityToUpdate.GetPopulation() == population)
{
Console.WriteLine($"{cityToUpdate.GetCityName()}, {cityToUpdate.GetProvince()} already has a population of {string.Format("{0:n0}", population)}.");
return;
}
switch (fileName)
{
case "Canadacities-XML.xml":
UpdateXMLFile(cityName, cityToUpdate.GetProvince(), population, fileName);
break;
case "Canadacities-JSON.json":
UpdateJSONFile(cityName, cityToUpdate.GetProvince(), population, fileName);
break;
case "Canadacities.csv":
UpdateCSVFile(cityName, cityToUpdate.GetProvince(), population, fileName);
break;
default:
throw new Exception($"Invalid file name: {fileName}");
}
ulong oldPopulation = cityToUpdate.GetPopulation();
cityToUpdate.SetPopulation(population);
PopulationChangeEvent.OnPopulationChange(new PopulationChangeEventArgs(
cityToUpdate.GetCityName(),
cityToUpdate.GetProvince(),
oldPopulation,
population
));
}
else
{
Console.WriteLine($"\nNo city exists in the collection called {CapitalizeString(cityName)}\n");
}
}
catch (Exception ex)
{
Console.WriteLine($"Population Update Failed: {ex.Message}");
}
}
/// <summary>
/// Displays the city information.
/// </summary>
/// <param name="cityName">Name of the city.</param>
public void DisplayCityInformation(string cityName)
{
CityInfo chosenCity = GetSpecificCity(cityName);
if (chosenCity != null)
{
PrintCityDetails(chosenCity.GetCityName(), chosenCity.GetProvince(), chosenCity.GetPopulation());
}
}
/// <summary>
/// Reports which city between two given cities has a higher population
/// </summary>
/// <param name="city1">First city object to compare</param>
/// <param name="city2">Second city object to compare</param>
public void CompareCitiesPopulation(CityInfo city1, CityInfo city2)
{
if (city1 == city2)
{
Console.WriteLine("\nThe two cities provided are the same\n");
return;
}
CityInfo smallerCity = city1.GetPopulation() < city2.GetPopulation() ? city1 : city2;
CityInfo largerCity = smallerCity == city1 ? city2 : city1;
Console.WriteLine($"\nLarger City:\t{CapitalizeString(largerCity.GetCityName())}, {CapitalizeString(largerCity.GetProvince())} ({string.Format("{0:n0}", largerCity.GetPopulation())})");
Console.WriteLine($"Smaller City:\t{CapitalizeString(smallerCity.GetCityName())}, {CapitalizeString(smallerCity.GetProvince())} ({string.Format("{0:n0}", smallerCity.GetPopulation())})\n");
}
/// <summary>
/// Menu for city statistics.
/// </summary>
/// <param name="cityStats">A populated statistics object</param>
static void CityMenu(Statistics cityStats)
{
string selection;
string titleText = "Cities Menu";
bool displayMenu = true;
string dash = new string('-', titleText.Length);
do
{
//Display the menu
if (displayMenu)
{
Console.Clear();
Console.WriteLine($"{dash}\n{titleText}\n{dash}\n");
Console.WriteLine("Available selections:\n");
Console.WriteLine("\t1) Display city's info.");
Console.WriteLine("\t2) Display the city with the largest population within a given province.");
Console.WriteLine("\t3) Display the city with the smallest population within a given province.");
Console.WriteLine("\t4) Compare the population of two cities.");
Console.WriteLine("\t5) Display the city on a map.");
Console.WriteLine("\t6) Calculate the distance between two cities.");
Console.WriteLine("\t7) Update the population of a specific city.");
Console.WriteLine("\treturn) Return to the main menu");
Console.Write("\nPlease make a selection (ex. 1, return): ");
}
displayMenu = true;
//Handle response
selection = Console.ReadLine();
string response;
switch (selection.ToLower())
{
case "1":
response = GetValidCityName(cityStats);
cityStats.DisplayCityInformation(response);
Console.WriteLine("Press any key to continue");
Console.ReadKey();
break;
case "2":
Console.WriteLine("\nWhich province do you wish to see the largest population city of?");
response = GetValidProvince(cityStats);
cityStats.DisplayLargestPopulationCity(response);
Console.WriteLine("Press any key to continue");
Console.ReadKey();
break;
case "3":
Console.WriteLine("\nWhich province do you wish to see the smallest population city of?");
response = GetValidProvince(cityStats);
cityStats.DisplaySmallestPopulationCity(response);
Console.WriteLine("Press any key to continue");
Console.ReadKey();
break;
case "4":
Console.WriteLine("\nWhich city do you want to pick first?");
CityInfo city1 = GetCityChoiceObject(cityStats);
Console.WriteLine("\nWhich city do you want to compare it to?");
CityInfo city2 = GetCityChoiceObject(cityStats);
cityStats.CompareCitiesPopulation(city1, city2);
Console.WriteLine("Press any key to continue");
Console.ReadKey();
break;
case "5":
Console.WriteLine("\nWhich city do you want to see on the map?");
CityInfo city = GetCityChoiceObject(cityStats);
cityStats.ShowCityOnMap($"{city.GetCityName().ToLower()}|{city.GetProvince().ToLower()}");
Console.WriteLine("Press any key to continue");
Console.ReadKey();
break;
case "6":
Console.WriteLine("\nWhich city do you want to start at?");
CityInfo startingCity = GetCityChoiceObject(cityStats);
Console.WriteLine("\nWhich city do you want to calculate the distance to?");
CityInfo endingCity = GetCityChoiceObject(cityStats);
cityStats.CalculateDistanceBetweenCities(startingCity, endingCity).Wait();
Console.WriteLine("Press any key to continue");
Console.ReadKey();
break;
case "7":
UpdatePopulation(cityStats);
Console.WriteLine("Press any key to continue");
Console.ReadKey();
break;
case "return":
return;
default:
Console.Write("\nInvalid selection, please enter a valid selection: ");
displayMenu = false;
break;
}
} while (true);
}
