public static IEnumerable <HitResult> Hit(Army army, UnitType firer, Army firingArmy, decimal amt, bool attacker, IHitSelector selector)
{
// If the army is empty, no hits are necessary. Return such.
if (army.Empty)
{
return(NoHits());
}
var type = selector.Select(army, firer, firingArmy, amt, !attacker);
// Check if the hitType is null. If so, no valid hits are possible. Thus, return an ineffective hit result for the appropriate amount.
if (type == null)
{
return(OneHit(HitResult.NewIneffective(amt)));
}
// Take the appropriate number of casualties from the army and capture the result.
var result = army.Hit(type, amt);
// Check if the resulting hit completed the required amount.
if (result.Amount == amt)
{
// If so, simply return that hit result.
return(OneHit(result));
}
else
{
// If not, then further hits need to be made. Recursively take away the remaining number of causualties, adding the results
// to the current one.
return(Hit(army, firer, firingArmy, amt - result.Amount, attacker, selector).Prepend(result));
}
}