package cactusServer.models;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import cactusServer.entities.CameraState;
import cactusServer.entities.EmoteState;
import cactusServer.entities.IDAddressedEntity;
import cactusServer.entities.Instance;
import cactusServer.entities.Player;
import cactusServer.utils.RandomStringGenerator;

/**
 * インスタンスを管理するクラス
 * 
 * @author r-isitani
 *
 */
public class Instances {
	private static Instances theInstance = null;
	private HashMap<String, Instance> instanceMap = new HashMap<>(); // instanceのIDと実体を管理
	private HashMap<String, Player> playerMap = new HashMap<>();
	private static final int UNIQUE_ID_LENGTH = 12;

	private Instances() {

	}

	/**
	 * Instancesクラスを取得する (シングルトン)
	 * 
	 * @return
	 */
	public static Instances getInstance() {
		if (theInstance == null) {
			theInstance = new Instances();
		}
		return theInstance;
	}

	/**
	 * 新しいInstanceクラスを作成してMapに追加する
	 * 
	 * @param name
	 * @param state
	 * @param stageModel
	 * @return
	 */
	public IDAddressedEntity createInstance(String name, Instance.State state, String stageModel) {
		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC,
				instanceMap.keySet());
		Instance instance = new Instance(name, state, stageModel);
		instanceMap.put(id, instance);
		return new IDAddressedEntity(id, instance);
	}

	public IDAddressedEntity createPlayer(String instanceURI, String characterURI, CameraState cameraState,
			EmoteState.EmoteType animationClassToStart) {
		String id = RandomStringGenerator.generateUniqueString(UNIQUE_ID_LENGTH, RandomStringGenerator.ALPHA_NUMERIC,
				playerMap.keySet());
		Player player = new Player(instanceURI, characterURI, cameraState, animationClassToStart);
		playerMap.put(id, player);
		return new IDAddressedEntity(id, player);
	}

	/**
	 * IDに対応するInstanceを取得して返す
	 * 
	 * @param instanceId
	 *            取得したいInstanceのID
	 * @return IDに対応するInstance
	 */
	public Instance getInstance(String instanceId) {
		return instanceMap.get(instanceId);
	}

	public List<Player> getPlayers() {
		return new ArrayList<Player>(playerMap.values());
	}

	public Player getPlayer(String playerId) {
		return playerMap.get(playerId);
	}

	/**
	 * IDに対応するInstanceをMapから削除して返す
	 * 
	 * @param instanceId
	 *            Instanceを識別する一意のID
	 * @return Mapから削除されたInstance
	 */
	public Instance destroyInstance(String instanceId) {
		return instanceMap.remove(instanceId);
	}

	public Player destroyPlayer(String playerId) {
		return playerMap.remove(playerId);
	}
}