/// <summary>
/// Checks for a specific visibility level of a space object for an empire.
/// If the object has that level of visibility or higher, we return true.
/// </summary>
/// <remarks>
/// This allows us to short circuit the more expensive scanner code.
/// See also parallel code at <see cref="CheckSpaceObjectVisibility(ISpaceObject, Empire)"/>
/// </remarks>
/// <param name="sobj">The space object to check.</param>
/// <param name="emp">The empire to check against.</param>
/// <param name="desiredVisibility">The requested visibility level.</param>
/// <returns>true if the space object has at least the requested visibility level, otherwise false.</returns>
public static bool HasVisibility(this ISpaceObject sobj, Empire emp, Visibility desiredVisibility)
{
bool hasMemory = false;
if (sobj.IsMemory)
{
var mowner = sobj.MemoryOwner();
if (mowner == emp || mowner == null)
{
return(Visibility.Fogged >= desiredVisibility);
}
else
{
return(Visibility.Unknown >= desiredVisibility); // can't see other players' memories
}
}
else
{
var mem = sobj.FindMemory(emp);
if (mem != null)
{
hasMemory = true;
}
}
if (emp == sobj.Owner)
{
return(Visibility.Owned >= desiredVisibility);
}
// You can always scan space objects you are in combat with.
// But only their state at the time they were in combat; not for the rest of the turn!
// TODO - what about glassed planets, they have no owner...
if (Galaxy.Current.Battles.Any(b =>
(b.Combatants.OfType <ISpaceObject>().Contains(sobj) ||
b.StartCombatants.Values.OfType <ISpaceObject>().Contains(sobj) ||
b.EndCombatants.Values.OfType <ISpaceObject>().Contains(sobj)) &&
b.Combatants.Any(c => c.Owner == emp)))
{
return(Visibility.Scanned >= desiredVisibility);
}
// do we have anything that can see it?
var sys = sobj.StarSystem;
if (sys == null)
{
return(Visibility.Unknown >= desiredVisibility);
}
var seers = sys.FindSpaceObjects <ISpaceObject>(s => s.Owner == emp && !s.IsMemory);
if (!seers.Any() || sobj.IsHiddenFrom(emp))
{
if (Galaxy.Current.OmniscientView && sobj.StarSystem.ExploredByEmpires.Contains(emp))
{
return(Visibility.Visible >= desiredVisibility);
}
if (emp.AllSystemsExploredFromStart)
{
return(Visibility.Fogged >= desiredVisibility);
}
var known = emp.Memory[sobj.ID];
if (known != null && sobj.GetType() == known.GetType())
{
return(Visibility.Fogged >= desiredVisibility);
}
else if (Galaxy.Current.Battles.Any(b => b.Combatants.Any(c => c.ID == sobj.ID) && b.Combatants.Any(c => c.Owner == emp)))
{
return(Visibility.Fogged >= desiredVisibility);
}
else if (hasMemory)
{
return(Visibility.Fogged >= desiredVisibility);
}
else
{
return(Visibility.Unknown >= desiredVisibility);
}
}
// short circuit scanner code: we now know that the object is either visible or scanned
// so if we only care if it's visible or less, we can skip the scanner check.
if (Visibility.Visible >= desiredVisibility)
{
return(true);
}
if (!sobj.HasAbility("Scanner Jammer"))
{
var scanners = seers.Where(s =>
s.HasAbility("Long Range Scanner") && s.GetAbilityValue("Long Range Scanner").ToInt() >= s.Sector.Coordinates.EightWayDistance(sobj.FindSector().Coordinates) ||
s.HasAbility("Long Range Scanner - System"));
if (scanners.Any())
{
return(Visibility.Scanned >= desiredVisibility);
}
}
// we know that the requested visibility level is greater than "visible"
// and the object has a scanner jammer
// therefore it can't be scanned, and we already know it's not owned, we checked that up top
// so we can just return false because the requested visibility (scanned or owned) can't be met
return(false);
}
/// <summary>
/// Determines the level of visibility of a space object to an empire.
/// <br/>
/// If you only need to verify that a space object has at least a certain level of visibility,
/// it is less expensive to call <see cref="HasVisibility(ISpaceObject, Empire, Visibility)"/>.
/// </summary>
/// <param name="sobj">The space object to check.</param>
/// <param name="emp">The empire to check against.</param>
/// <returns>The visibility level.</returns>
internal static Visibility CheckSpaceObjectVisibility(this ISpaceObject sobj, Empire emp)
{
bool hasMemory = false;
if (sobj.IsMemory)
{
var mowner = sobj.MemoryOwner();
if (mowner == emp || mowner == null)
{
return(Visibility.Fogged);
}
else
{
return(Visibility.Unknown); // can't see other players' memories
}
}
else
{
var mem = sobj.FindMemory(emp);
if (mem != null)
{
hasMemory = true;
}
}
if (emp == sobj.Owner)
{
return(Visibility.Owned);
}
// You can always scan space objects you are in combat with.
// But only their state at the time they were in combat; not for the rest of the turn!
// TODO - what about glassed planets, they have no owner...
if (Galaxy.Current.Battles.Any(b =>
(b.Combatants.OfType <ISpaceObject>().Contains(sobj) ||
b.StartCombatants.Values.OfType <ISpaceObject>().Contains(sobj) ||
b.EndCombatants.Values.OfType <ISpaceObject>().Contains(sobj)) &&
b.Combatants.Any(c => c.Owner == emp)))
{
return(Visibility.Scanned);
}
// do we have anything that can see it?
var sys = sobj.StarSystem;
if (sys == null)
{
return(Visibility.Unknown);
}
var seers = sys.FindSpaceObjects <ISpaceObject>(s => s.Owner == emp && !s.IsMemory);
if (!seers.Any() || sobj.IsHiddenFrom(emp))
{
if (Galaxy.Current.OmniscientView && sobj.StarSystem.ExploredByEmpires.Contains(emp))
{
return(Visibility.Visible);
}
if (emp.AllSystemsExploredFromStart)
{
return(Visibility.Fogged);
}
var known = emp.Memory[sobj.ID];
if (known != null && sobj.GetType() == known.GetType())
{
return(Visibility.Fogged);
}
else if (Galaxy.Current.Battles.Any(b => b.Combatants.Any(c => c.ID == sobj.ID) && b.Combatants.Any(c => c.Owner == emp)))
{
return(Visibility.Fogged);
}
else if (hasMemory)
{
return(Visibility.Fogged);
}
else
{
return(Visibility.Unknown);
}
}
if (!sobj.HasAbility("Scanner Jammer"))
{
var scanners = seers.Where(s =>
s.HasAbility("Long Range Scanner") && s.GetAbilityValue("Long Range Scanner").ToInt() >= s.Sector.Coordinates.EightWayDistance(sobj.FindSector().Coordinates) ||
s.HasAbility("Long Range Scanner - System"));
if (scanners.Any())
{
return(Visibility.Scanned);
}
}
return(Visibility.Visible);
}
