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package scalevalapokalypsi.Model
import scalevalapokalypsi.Model.Entities.Entity
import scala.collection.immutable.Map
/** A description of an action.
*
* @param inFirstPersons a Map of descriptions in first person for entities
* given as keys
* @param inThirdPerson textual description of the event in third person
*/
class Event(
val inFirstPersons: Map[Entity, String],
val inThirdPerson: String
):
// And why are we not just using a map with a default value?
// Wrapping this in an Event creates a more specific abstraction.
// It indicates, that instances of this class are precisely descriptions
// of events, and it allows changing the private implementation without
// touching the public interface.
private val values = inFirstPersons.withDefaultValue(inThirdPerson)
/** Gets the description of this event as seen by the given
* entity. Note that this method does no checks whether the given entity
* could even see the event, only what it would have looked like to them.
*
* @param entity the entity whose perspective to use
* @return a textual description of the event
*/
def descriptionFor(entity: Entity): String =
this.values.apply(entity)
end Event
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