import gtk
import gobject
import plots
import time
import fluents
import dataset, logger, plots, project, workflow

class NavigatorView (gtk.TreeView):
    def __init__(self, project, app):
        self.project = project
        self.app = app
        if project:
            self.data_tree = project.data_tree
        else:
            self.data_tree = None
        
        gtk.TreeView.__init__(self) 

        # various properties
        self.set_headers_visible(False)
        self.get_hadjustment().set_value(0)
        self.set_enable_tree_lines(True)

        # Selection Mode
        self.get_selection().set_mode(gtk.SELECTION_MULTIPLE)
        self.get_selection().set_select_function(self.is_selectable)
        self.get_selection().connect('changed',self.selection_changed_handler)
        self._previous_selection = []

        # Setting up TextRenderers etc
        #        self.connect('cursor_changed', self.cursor_changed_handler)
        self.connect('row_activated', self.row_activated_handler)

        # Activate context menu
        self.menu = NavigatorMenu(self)
        self.connect('popup_menu', self.popup_menu)
        self.connect('button_press_event', self.on_mouse_event)

        self.textrenderer = textrenderer = gtk.CellRendererText()
        pixbufrenderer = gtk.CellRendererPixbuf()
        self.object_col = gtk.TreeViewColumn('Object')
        self.object_col.pack_start(pixbufrenderer,expand=False)
        self.object_col.pack_start(textrenderer,expand=False)
        self.object_col.set_attributes(textrenderer, cell_background=3, foreground=4, text=0)
        self.object_col.set_attributes(pixbufrenderer, pixbuf=5)
        self.append_column(self.object_col)

        # send events to plots / itself
        self.enable_model_drag_source(gtk.gdk.BUTTON1_MASK,
            [("GTK_TREE_MODEL_ROW", gtk.TARGET_SAME_APP, 7)],
            gtk.gdk.ACTION_LINK | gtk.gdk.ACTION_MOVE)
    
        self.connect("drag-data-get",self.slot_drag_data)

        logger.log('debug', 'Initializing navigator window.')

   
    # sets data for drag event.
    def slot_drag_data(self,treeview,context,selection,target_id,etime):
        treeselection = treeview.get_selection()
        model, paths = treeselection.get_selected_rows()
        if paths:
            self.data_tree.drag_data_get(paths[0], selection)

    def add_project(self, project):
        self.project = project
        self.data_tree = project.data_tree
        self.set_model(project.data_tree)
        self.data_tree.connect('row-changed',self.row_changed_handler)
    
    def is_selectable(self,path):
        if self.data_tree:
            obj = self.data_tree.get_value(self.data_tree.get_iter(path),2)
            if not obj:
                return False
            if not isinstance(obj, dataset.Dataset):
                return False
        return True

    # selection changed, setting current_data ojbects
    def selection_changed_handler(self, selection):
        # update prev selection right away in case of multiple events
        model, paths = selection.get_selected_rows()
        if not paths: # a plot is marked: do nothing
            return

        tmp = self._previous_selection
        self._previous_selection = paths
        # set timestamp on newly selected objects
        [self.data_tree.set_value(self.data_tree.get_iter(path), 6, time.time()) 
            for path in paths if path not in tmp]

        objs = [self.data_tree.get_iter(path) for path in paths]
        objs = [(self.data_tree.get_value(iter,6), self.data_tree.get_value(iter,2)) 
            for iter in objs]
        objs.sort()
        objs = [obj for timestamp, obj in objs]
        # order dataset

        if objs and isinstance(objs[0], dataset.Dataset):
            logger.log('debug', 'Selecting dataset')
            self.project.set_current_data(objs)
        else:
            logger.log('debug', 'Deselecting dataset')
            self.project.set_current_data([])


    # TreeView changed. Set correct focus and colours
    def row_changed_handler(self, treestore, pos, iter):
        obj  = treestore.get_value(iter,2)
        type_= treestore.get_value(iter,1)

        if not (treestore.get_value(iter,2) or treestore.get_value(iter,1)):
            return
        self.expand_to_path(pos)        

        if isinstance(obj,dataset.Dataset):
            self.set_cursor(pos)
            self.grab_focus()
        
    def display_data_info(self, data):
        dims = zip(data.get_dim_name(), data.shape)
        
        dim_text = ", ".join(["%s (%d)" % dim for dim in dims])

        text = """<span weight="bold">Data:</span> %s

<span weight="bold">Dimensions:</span> %s""" % (data.get_name(), dim_text)

        d = gtk.MessageDialog(flags=(gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT),
                              buttons=gtk.BUTTONS_OK)
        d.set_markup(text)
        d.set_default_response(gtk.BUTTONS_OK)
        d.run()
        d.destroy()        
        
    def row_activated_handler(self, widget, path, column):
        tree_iter = self.data_tree.get_iter(path)
        obj = self.data_tree.get_value(tree_iter, 2)
        
        if isinstance(obj, plots.Plot):
            logger.log('debug', 'Activating plot')
            self.app.change_plot(obj)
        elif isinstance(obj, dataset.Dataset):
            self.display_data_info(obj)
        elif obj == None:
            children = []
            i = self.data_tree.iter_children(tree_iter)
            while i:
                child = self.data_tree.get(i, 2)[0]
                if isinstance(child, plots.Plot):
                    children.append(child)
                i = self.data_tree.iter_next(i)
            self.app.change_plots(children)
        else:
            t = type(obj)
            logger.log('debug', 'Activated datatype was %s. Don\'t know what to do.' % t)

    def popup_menu(self, *rest):
        self.menu.popup(None, None, None, 0, 0)

    def on_mouse_event(self, widget, event):
        path = widget.get_path_at_pos(int(event.x), int(event.y))

        if path:
            iter = self.data_tree.get_iter(path[0])
            obj = self.data_tree.get_value(iter, 2)
        else:
            obj = None

        if isinstance(obj, dataset.Dataset):
            self.menu.set_dataset(obj)
        else:
            self.menu.set_dataset(None)

        if event.button == 3:
            self.menu.popup(None, None, None, event.button, event.time)


class NavigatorMenu(gtk.Menu):
    def __init__(self, navigator):
        gtk.Menu.__init__(self)
        self.navigaotor = navigator
        self.dataset = None
        
        # Populate menu
        self.load_item = gtk.MenuItem('Load dataset')
        self.load_item.connect('activate', self.on_load_dataset, navigator)
        self.append(self.load_item)
        self.load_item.show()

        self.save_item = gtk.MenuItem('Save dataset')
        self.save_item.connect('activate', self.on_save_dataset, navigator)
        self.append(self.save_item)
        self.save_item.show()

    def set_dataset(self, ds):
        self.dataset = ds
        if ds == None:
            self.save_item.set_property('sensitive', False)
        else:
            self.save_item.set_property('sensitive', True)
        

    def on_load_dataset(self, item, navigator):
        dialog = gtk.FileChooserDialog('Load dataset')
        dialog.set_action(gtk.FILE_CHOOSER_ACTION_OPEN)
        dialog.add_buttons(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL, gtk.STOCK_OPEN, gtk.RESPONSE_OK)
        dialog.set_select_multiple(True)
        retval = dialog.run()
        if retval in [gtk.RESPONSE_CANCEL, gtk.RESPONSE_DELETE_EVENT]:
            pass
        elif retval == gtk.RESPONSE_OK:
            for filename in dialog.get_filenames():
                fd = open(filename)
                ds = dataset.read_ftsv(fd)
                fd.close()

                if isinstance(ds, dataset.GraphDataset):
                    icon = fluents.icon_factory.get("graph_dataset")
                elif isinstance(ds, dataset.CategoryDataset):
                    icon = fluents.icon_factory.get("category_dataset")
                else:
                    icon = fluents.icon_factory.get("dataset")

                project = navigator.project
                project.add_dataset(ds)
                project.data_tree_insert(None, ds.get_name(), ds, None, "black", icon)
        else:
            print "unknown; ", retval 
        dialog.destroy()

    def on_save_dataset(self, item, navigator):
        dialog = gtk.FileChooserDialog('Save dataset')
        dialog.set_action(gtk.FILE_CHOOSER_ACTION_SAVE)
        dialog.add_buttons(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL, gtk.STOCK_SAVE, gtk.RESPONSE_OK)
        dialog.set_current_name("%s.ftsv" % self.dataset.get_name())
        retval = dialog.run()
        if retval in [gtk.RESPONSE_CANCEL, gtk.RESPONSE_DELETE_EVENT]:
            logger.log("debug", "Cancelled save dataset")
        elif retval == gtk.RESPONSE_OK:
            logger.log("debug", "Saving dataset as: %s" % dialog.get_filename())
            fd = open(dialog.get_filename(), 'w')
            dataset.write_ftsv(fd, self.dataset)
            fd.close()
        else:
            print "unknown; ", retval 
        dialog.destroy()