package o1game.Model

import scala.collection.mutable.Map

/** A `Player` object represents a player character controlled by the real-life user
  * of the program.
  *
  * A player object’s state is mutable: the player’s location and possessions can change,
  * for instance.
  *
  * @param startingArea the player’s initial location */
class Entity(val name: String, initialLocation: Area):
	private var currentLocation: Area = initialLocation
	private var quitCommandGiven = false // one-way flag
	private val inventory: Map[String, Item] = Map()

	/** Determines if the player has indicated a desire to quit the game. */
	def hasQuit = this.quitCommandGiven // TODO: This is probably unneccessary?

	/** Returns the player’s current location. */
	def location = this.currentLocation

	/** Attempts to move the player in the given direction. This is successful if there
	  * is an exit from the player’s current location towards the direction name. Returns
	  * a description of the result: "You go DIRECTION." or "You can't go DIRECTION." */
	def go(direction: String) =
		val destination = this.location.neighbor(direction)
		if destination.isDefined then
			this.currentLocation.removeEntity(this.name)
			this.currentLocation = destination.getOrElse(this.currentLocation)
			destination.foreach(_.addEntity(this))
			s"You go $direction."
		else
			"You can't go " + direction + "."

	def pickUp(itemName: String): String =
		this.currentLocation.removeItem(itemName) match
			case Some(i) =>
				this.inventory += i.name -> i
				s"You pick up the ${i.name}"
			case None => s"There is no $itemName here to pick up."

	def drop(itemName: String): String =
		this.inventory.remove(itemName) match
			case Some(item) =>
				this.currentLocation.addItem(item)
				s"You drop the $itemName"
			case None => "You don't have that!"

	/** Causes the player to rest for a short while (this has no substantial effect in game terms).
	  * Returns a description of what happened. */
	def rest() =
		"You rest for a while. Better get a move on, though."

	/** Signals that the player wants to quit the game. Returns a description of what happened within
	  * the game as a result (which is the empty string, in this case). */
	def quit() =
		this.quitCommandGiven = true
		""

	/** Returns a brief description of the player’s state, for debugging purposes. */
	override def toString = "Now at: " + this.location.name

end Entity