#import logger 
import dataset

class Project:
    def __init__(self,name="Testing"):
        self.name = name
        self.dim_names = []
        self._selection_observers = []
        self.current_selection = {}
        self.current_data=[]
        self.datasets=[]
        
    def attach(self, observer):
        if not observer in self._selection_observers:
            self._selection_observers.append(observer)

    def detach(self, observer):
       try:
           self.selection_observers.remove(observer)
       except ValueError:
           pass

    def notify(self, modifier=None):
        for observer in self.selection_observers:
            if modifier != observer:
                observer.update(self)

    def set_selection(self,dim_name,selection):
        current_selection = set(selection)
        self.current_selection[dim_name] = current_selection
        self.notify()

    def get_selection(self,sel_obj):
        return sel_obj.current_selection

    
    def add_dataset(self,dataset):
        self.datasets.append(dataset)
        for dim_name in dataset.ids.keys():
            if dim_name not in self.dim_names:
                self.dim_names.append(dim_name)

    def suggest_dim_name(self,dim_name):
        if dim_name in self.dim_names:
            dim_name = dim_name + "_t" 
        return dim_name
        
            
c_p = Project()