package com.softwarerat.API.data.gameState;

import java.util.Arrays;

public class GameStateManager {
    


    private final IGameState[] gameStates;
  
  private int currentStateId;
  
  public GameStateManager(IGameState... gameStates) {
    this.gameStates = gameStates;
  }
  
  public IGameState getCurrentState() {
    if (this.currentStateId < 0 || this.currentStateId >= this.gameStates.length)
      return null; 
    return this.gameStates[this.currentStateId];
  }
  
  public IGameState nextState() {
    if (this.currentStateId + 1 == this.gameStates.length)
      throw new IllegalStateException("No states remaining"); 
    
    IGameState oldState = getCurrentState();
    this.currentStateId++;
    IGameState newState = getCurrentState();
    oldState.Stop();
    newState.Start(this);
    return newState;
  }
  
  @SafeVarargs
  public final boolean isCurrentGameState(Class<? extends IGameState>... states) {
    return Arrays.<Class<? extends IGameState>>stream(states).anyMatch(state -> state.isInstance(getCurrentState()));
  }
}