/// <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");
}
