class WorldManager():

    #the aray of variables for worlds 
    def __init__(self):
        self.worlds = []
        self.current_world = 0
        self.total_worlds = 0

    #adding world files to the aray 
    def AddWorld(self, world):
        self.worlds.append(world)
        self.total_worlds += 1
    #get world from the aray 
    def GetWorld(self, index):
        return self.worlds[index]
    
    #setting world value manuly
    def SetWorld(self, index):
        self.current_world = index
        return self.worlds[self.current_world]
    
    #if you want the go to next world
    def NextWorld(self):        
        self.current_world += 1
        
        if(self.current_world == self.worlds.__len__()):
            return None
        
        return self.worlds[self.current_world]
    
    # the world before the current one 
    def PreviousWorld(self):
        if(self.current_world > 0):
            self.current_world -= 1
        return self.worlds[self.current_world]
    
    #getting the current world number 
    def GetWorldNumber(self):
        return self.current_world
    
    #when you reach the end 
    def ReachedEnd(self):
        if self.current_world == self.worlds.__len__():
            return True
        return False