/// <summary>
/// Immediately attempts to perform a creature movement to a tile on the map.
/// </summary>
/// <param name="context">A reference to the operation context.</param>
/// <param name="creature">The creature being moved.</param>
/// <param name="toLocation">The tile to which the movement is being performed.</param>
/// <param name="isTeleport">Optional. A value indicating whether the movement is considered a teleportation. Defaults to false.</param>
/// <param name="requestorCreature">Optional. The creature that this movement is being performed in behalf of, if any.</param>
/// <returns>True if the movement was successfully performed, false otherwise.</returns>
/// <remarks>Changes game state, should only be performed after all pertinent validations happen.</remarks>
private bool PerformCreatureMovement(IOperationContext context, ICreature creature, Location toLocation, bool isTeleport = false, ICreature requestorCreature = null)
{
if (creature == null || !(creature.ParentContainer is ITile fromTile) || !context.Map.HasTileAt(toLocation, out ITile toTile))
{
return(false);
}
var moveDirection = fromTile.Location.DirectionTo(toLocation, true);
// Try to figure out the position in the stack of the creature.
var fromTileStackPos = fromTile.GetIndexOfThing(creature);
if (fromTileStackPos == byte.MaxValue)
{
// couldn't find this creature in this tile...
return(false);
}
// Do the actual move first.
if (!fromTile.RemoveCreature(creature))
{
return(false);
}
if (!toTile.AddCreature(creature))
{
// attempt to rollback state.
if (!fromTile.RemoveCreature(creature))
{
// Leaves us in a really bad spot.
throw new ApplicationException("Unable to rollback state after filing to move creature. Game state is altered and inconsistent now.");
}
}
var toStackPosition = toTile.GetIndexOfThing(creature);
if (toStackPosition == byte.MaxValue)
{
context.Logger.LogWarning("Unexpected destination stack position during creature movement, suggests that the creature is not found in the destination tile after the move.");
}
// Then deal with the consequences of the move.
((Creature)creature).Direction = moveDirection;
((Creature)creature).LastMovementCostModifier = (fromTile.Location - toLocation).Z != 0 ? 2 : moveDirection.IsDiagonal() ? 3 : 1;
this.ExhaustionInfo[ExhaustionFlag.Movement] = creature.CalculateStepDuration(fromTile);
this.SendNotification(
context,
new CreatureMovedNotification(
context.Map.FindPlayersThatCanSee(fromTile.Location, toLocation),
context.Map,
creature,
fromTile.Location,
fromTileStackPos,
toTile.Location,
toStackPosition,
isTeleport));
return(true);
}
