import os
import scipy
import gobject
import gtk
import fluents
import logger
import dataset, plots

class Project:
    def __init__(self,name="Testing"):
        self.data_tree = gtk.TreeStore(gobject.TYPE_STRING, 
                                       gobject.TYPE_STRING, 
                                       gobject.TYPE_PYOBJECT, 
                                       gobject.TYPE_STRING,
                                       gobject.TYPE_STRING, 
                                       gobject.TYPE_OBJECT,
                                       gobject.TYPE_DOUBLE)

        self.name = name
        self.dim_names = []
        self._selection_observers = []
        self._dataset_observers = []
        self.current_data = []
        self.datasets = []
        self.sel_obj = dataset.Selection('Current Selection')
        self.selections = []
        self._last_selection = None
        self._dataset_iter_map = {}
        
    def add_selection_observer(self, observer):
        self._selection_observers.append(observer)
        observer.selection_changed(None, self.get_selection())

    def notify_selection_listeners(self, dim_name):
        """Notifies observers"""
        for observer in self._selection_observers:
            observer.selection_changed(dim_name, self.get_selection())

    def add_dataset_observer(self, observer):
        self._dataset_observers.append(observer)
        observer.dataset_changed()

    def notify_dataset_listeners(self):
        """Notifies observers when new datasets are added"""
        for observer in self._dataset_observers:
            observer.dataset_changed()
        
    def set_selection(self, dim_name, selection):
        """Sets a current selection and notify observers"""
        self.sel_obj[dim_name] = set(selection)
        self.notify_selection_listeners(dim_name)
        self._last_selection = selection

    def get_selection(self):
        """Returns the current selection object"""
        return self.sel_obj

    def add_data(self, parents, data, fun='Function'):
        """Adds a set of data and plots to the navigator.

        This method is usually called after a Function in a workflow
        has finished and returns its output."""
        
        if len(parents) > 0: 
            parent_iter = self._dataset_iter_map[parents[0]]
        else:
            parent_iter = None

        # Add the function node to the tree
        icon = fluents.icon_factory.get("folder_grey")
        it = self.data_tree_insert(parent_iter, fun, None, None, "black", icon)
        
        # Add all returned datasets/plots/selections
        for d in data:
            # Any kind of dataset
            if isinstance(d, dataset.Dataset):
                if isinstance(d, dataset.GraphDataset):
                    icon = fluents.icon_factory.get("graph_dataset")
                elif isinstance(d, dataset.CategoryDataset):
                    icon = fluents.icon_factory.get("category_dataset")
                else:
                    icon = fluents.icon_factory.get("dataset")

                self.add_dataset(d)
                self.data_tree_insert(it, d.get_name(), d, None, "black", icon) 

            # Any kind of plot
            elif isinstance(d, plots.Plot):
                icon = fluents.icon_factory.get("line_plot")
                self.data_tree_insert(it, d.get_title(), d, None, "black", icon)
                d.set_selection_listener(self.set_selection)
                self._selection_observers.append(d)

            # Selections are not added to the data tree
            elif isinstance(d, dataset.Selection):
                self.add_selection(d)

    def data_tree_insert(self, parent, text, data, bgcolour, fontcolour, icon, selected = 0):
        tree = self.data_tree
        it = tree.append(parent)
        tree.set_value(it, 0, text)
        tree.set_value(it, 1, type(data))
        tree.set_value(it, 2, data)
        tree.set_value(it, 3, bgcolour)
        tree.set_value(it, 4, fontcolour)
        tree.set_value(it, 5, icon)
        tree.set_value(it, 6, selected)
        self._dataset_iter_map[data] = it
        return it

    def add_dataset(self, dataset):
        """Appends a new Dataset to the project."""
        logger.log('debug','Adding dataset: %s' %dataset.get_name())
        self.datasets.append(dataset)
        for dim_name in dataset.get_all_dims():
            if dim_name not in self.dim_names:
                self.dim_names.append(dim_name)
                self.sel_obj[dim_name] = set()
                self.notify_selection_listeners(dim_name)
        self.notify_dataset_listeners()

    def add_selection(self, selection):
        """Adds a new selection to the project."""
        self.selections.append(selection)
        self.notify_dataset_listeners()
        
    def object_at(self, path):
        "Returns the object at a given path in the tree."
        iter = self.get_iter(path)
        object = self.get_value(iter, 2)
        if object:
            object.show()
        return object

    def set_current_data(self, obj):
        self.current_data = obj


## Singleton project.
## This is the current and only project in the application.
project = None