private bool invadeCity(ICity city, IEarthDefender defender, StringBuilder outputText, bool singleWave)
{
var random = new Random();
for (int wave = 1; wave <= (singleWave? 1 : city.Waves); wave++)
{
describeWave(wave, outputText, singleWave);
AlienInvasionWave invasionWave = city.GetInvasionWave(random);
outputText.AppendLine(string.Format("{0} alien invader{1} closing in on {2}...", invasionWave.AlienInvaders.Length, (invasionWave.AlienInvaders.Length > 1) ? "s are" : " is", city.Name));
bool systemFailed = false;
DefenceStrategy strategy = null;
try
{
strategy = defender.DefendEarth(invasionWave);
}
catch (Exception ex)
{
outputText.AppendLine("The defence code threw an exception: " + ex);
outputText.AppendLine("The defence system is down ... we're all going to die!");
systemFailed = true;
}
if (strategy == null && systemFailed == false)
{
outputText.AppendLine("We didn't get a defence strategy from the software!");
}
int aliensLeft = invasionWave.AlienInvaders.Length;
if (systemFailed == false && strategy != null)
{
aliensLeft = executeDefenceStrategy(invasionWave, strategy, outputText);
}
if (aliensLeft == 0)
{
outputText.AppendLine("All aliens in this wave were successfully destroyed!");
}
else
{
outputText.AppendLine(string.Format("Oh no! {0} alien{1} made it past our defences!", aliensLeft, (aliensLeft > 1) ? "s" : string.Empty));
outputText.AppendLine("A large part of " + city.Name + " has been destroyed! We need better quality software ...");
return(true);
}
foreach (ExecutableDefenceWeapon asset in city.DefenceWeapons)
{
asset.WaveFinished();
}
}
outputText.AppendLine("You have successfully defended " + city.Name.ToUpper() + " from alien attack.");
return(false);
}
private int executeDefenceStrategy(AlienInvasionWave invasionWave, DefenceStrategy strategy, StringBuilder outputText)
{
if (strategy.WeaponsToFireAtThisWave.Any(a => a is ExecutableDefenceWeapon == false))
{
throw new Exception("The defence strategy you return from your code can only make use of the weapons supplied to it in the IAlienInvasionWave");
}
var invaders = invasionWave.AlienInvaders.Cast <AlienInvader>().ToList();
var assets = strategy.WeaponsToFireAtThisWave.Cast <ExecutableDefenceWeapon>().ToList();
while (assets.Count > 0)
{
assets.First().Execute(invasionWave.City, invaders, outputText);
assets.RemoveAt(0);
}
return(invaders.Count);
}