#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2000-2006  Donald N. Allingham
#               2009       Benny Malengier
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

# $Id$

#-------------------------------------------------------------------------
#
# python
#
#-------------------------------------------------------------------------
from gen.ggettext import gettext as _
import cPickle as pickle

#-------------------------------------------------------------------------
#
# GTK libraries
#
#-------------------------------------------------------------------------
import gobject
import gtk
import pango

#-------------------------------------------------------------------------
#
# GRAMPS classes
#
#-------------------------------------------------------------------------
import gui.utils
from buttontab import ButtonTab

#-------------------------------------------------------------------------
#
# Classes
#
#-------------------------------------------------------------------------
class EmbeddedList(ButtonTab):
    """
    This class provides the base class for all the list tabs. 
    
    It maintains a gtk.TreeView, including the selection and button sensitivity.
    """
    
    _HANDLE_COL = -1
    _DND_TYPE   = None
    _DND_EXTRA  = None
    
    def __init__(self, dbstate, uistate, track, name, build_model,
                 share_button=False, move_buttons=False, jump_button=False,
                 top_label=None):
        """
        Create a new list, using the passed build_model to populate the list.
        """
        ButtonTab.__init__(self, dbstate, uistate, track, name, share_button, 
                           move_buttons, jump_button, top_label)

        self.changed = False
        self.model = None
        self.build_model = build_model

        # handle the selection
        self.selection = self.tree.get_selection()
        self.selection.connect('changed', self._selection_changed)
        self.track_ref_for_deletion("selection")

        # build the columns
        self.columns = []
        self.build_columns()

        if self._DND_TYPE:
            self._set_dnd()

        # set up right click option
        self.tree.connect('button-press-event', self._on_button_press)

        # build the initial data
        self.rebuild()
        self.show_all()

    def _on_button_press(self, obj, event):
        """
        Handle button press, not double-click, that is done in init_interface
        """
        if gui.utils.is_right_click(event):
            ref = self.get_selected()
            if ref:
                self.right_click(obj, event)
        elif event.type == gtk.gdk.BUTTON_PRESS and event.button == 2:
            fun = self.get_middle_click()
            if fun:
                fun()

    def get_popup_menu_items(self):
        """
        Create the list needed to populate the right popup action
        An entry is
            ( needs_write_access, image, title, function)
        If image == False, then only text label with title is shown
        If image == True, and image is a tuple (stock_id, text), the image
            of the stock id (eg 'gramps-family') is shown, and the label text
            If image is not a tuple, then it should be a stock_id, and the 
            image is shown, with label the default stock_id label.
        """
        if self.share_btn:
            itemlist = [
                (True, True, gtk.STOCK_ADD, self.add_button_clicked),
                (True, False, _('Share'), self.share_button_clicked),
                (False,True, gtk.STOCK_EDIT, self.edit_button_clicked),
                (True, True, gtk.STOCK_REMOVE, self.del_button_clicked),
                ]
        else:
            itemlist = [
                (True, True, gtk.STOCK_ADD, self.add_button_clicked),
                (False,True, gtk.STOCK_EDIT, self.edit_button_clicked),
                (True, True, gtk.STOCK_REMOVE, self.del_button_clicked),
            ]
        return itemlist

    def get_middle_click(self):
        return None

    def right_click(self, obj, event):
        """
        On right click show a popup menu.
        This is populated with get_popup_menu_items
        """
        menu = gtk.Menu()
        for (needs_write_access, image, title, func) in self.get_popup_menu_items():
            if image:
                if isinstance(title, tuple):
                    img_stock, txt = title
                    item = gtk.ImageMenuItem(txt)
                    img = gtk.Image()
                    img.set_from_stock(img_stock, gtk.ICON_SIZE_MENU)
                    item.set_image(img)
                else:
                    item = gtk.ImageMenuItem(stock_id=title)
            else:
                item = gtk.MenuItem(title)
            item.connect('activate', func)
            if needs_write_access and self.dbstate.db.readonly:
                item.set_sensitive(False)
            item.show()
            menu.append(item)
        menu.popup(None, None, None, event.button, event.time)

    def find_index(self, obj):
        """
        returns the index of the object within the associated data
        """
        return self.get_data().index(obj)

    def _set_dnd(self):
        """
        Set up drag-n-drop. The source and destination are set by calling .target()
        on the _DND_TYPE. Obviously, this means that there must be a _DND_TYPE
        variable defined that points to an entry in DdTargets.
        """

        if self._DND_EXTRA:
            dnd_types = [ self._DND_TYPE.target(), self._DND_EXTRA.target() ]
        else:
            dnd_types = [ self._DND_TYPE.target() ]
        
        self.tree.enable_model_drag_dest(dnd_types,
                                         gtk.gdk.ACTION_COPY)
        self.tree.enable_model_drag_source(gtk.gdk.BUTTON1_MASK,
                                  [self._DND_TYPE.target()],
                                  gtk.gdk.ACTION_COPY)
        self.tree.connect('drag_data_get', self.drag_data_get)
        if not self.dbstate.db.readonly:
            self.tree.connect('drag_data_received', self.drag_data_received)
            self.tree.connect('drag_motion', self.tree_drag_motion)
        
    def drag_data_get(self, widget, context, sel_data, info, time):
        """
        Provide the drag_data_get function, which passes a tuple consisting of:

           1) Drag type defined by the .drag_type field specified by the value
              assigned to _DND_TYPE
           2) The id value of this object, used for the purpose of determining
              the source of the object. If the source of the object is the same
              as the object, we are doing a reorder instead of a normal drag
              and drop
           3) Pickled data. The pickled version of the selected object
           4) Source row. Used for a reorder to determine the original position
              of the object
        """

        # get the selected object, returning if not is defined
        obj = self.get_selected()
        if not obj:
            return

        # pickle the data, and build the tuple to be passed
        value = (self._DND_TYPE.drag_type, id(self), obj, self.find_index(obj))
        data = pickle.dumps(value)

        # pass as a string (8 bits)
        sel_data.set(sel_data.target, 8, data)

    def drag_data_received(self, widget, context, x, y, sel_data, info, time):
        """
        Handle the standard gtk interface for drag_data_received.

        If the selection data is defined, extract the value from sel_data.data,
        and decide if this is a move or a reorder.
        """
        if sel_data and sel_data.data:
            (mytype, selfid, obj, row_from) = pickle.loads(sel_data.data)

            # make sure this is the correct DND type for this object
            if mytype == self._DND_TYPE.drag_type:
                
                # determine the destination row
                row = self._find_row(x, y)

                # if the is same object, we have a move, otherwise,
                # it is a standard drag-n-drop
                
                if id(self) == selfid and self.get_selected() is not None:
                    self._move(row_from, row, obj)
                else:
                    self._handle_drag(row, obj)
                self.rebuild()
            elif self._DND_EXTRA and mytype == self._DND_EXTRA.drag_type:
                self.handle_extra_type(mytype, obj)

    def tree_drag_motion(self, *args):
        """
        On drag motion one wants the list to show as the database 
        representation so it is clear how save will change the data.
        """
        pass

    def handle_extra_type(self, objtype, obj):
        pass

    def _find_row(self, x, y):
        row = self.tree.get_dest_row_at_pos(x, y)
        if row is None:
            return len(self.get_data())
        else:
            if row[1] in (gtk.TREE_VIEW_DROP_BEFORE,
                          gtk.TREE_VIEW_DROP_INTO_OR_BEFORE):
                return row[0][0]
            else:
                return row[0][0]+1

    def _handle_drag(self, row, obj):
        self.get_data().insert(row, obj)
        self.changed = True

    def _move(self, row_from, row_to, obj):
        dlist = self.get_data()
        if row_from < row_to:
            dlist.insert(row_to, obj)
            del dlist[row_from]
        else:
            del dlist[row_from]
            dlist.insert(row_to, obj)
        self.changed = True
    
    def _move_up(self, row_from, obj, selmethod=None):
        """ 
        Move the item a position up in the EmbeddedList.
        Eg: 0,1,2,3 needs to become 0,2,1,3, here row_from = 2
        """
        if selmethod :
            dlist = selmethod()
        else :
            dlist = self.get_data()
        del dlist[row_from]
        dlist.insert(row_from-1, obj)
        self.changed = True
        self.rebuild()
        #select the row
        path = '%d' % (row_from-1) 
        self.tree.get_selection().select_path(path)
        # The height/location of gtk.treecells is calculated in an idle handler
        # so use idle_add to scroll cell into view.
        gobject.idle_add(self.tree.scroll_to_cell, path)
        
    def _move_down(self, row_from, obj, selmethod=None):
        """ 
        Move the item a position down in the EmbeddedList.
        Eg: 0,1,2,3 needs to become 0,2,1,3, here row_from = 1
        """
        if selmethod :
            dlist = selmethod()
        else :
            dlist = self.get_data()
        del dlist[row_from]
        dlist.insert(row_from+1, obj)
        self.changed = True
        self.rebuild()
        #select the row
        path = '%d' % (row_from+1) 
        self.tree.get_selection().select_path(path)
        gobject.idle_add(self.tree.scroll_to_cell, path)

    def get_icon_name(self):
        """
        Specifies the basic icon used for a generic list. Typically,
        a derived class will override this. The icon chosen is the
        STOCK_JUSTIFY_FILL icon, which in the default GTK style
        looks kind of like a list.
        """
        return gtk.STOCK_JUSTIFY_FILL

    def del_button_clicked(self, obj):
        ref = self.get_selected()
        if ref:
            ref_list = self.get_data()
            ref_list.remove(ref)
            self.changed = True
            self.rebuild()
            
    def up_button_clicked(self, obj):
        ref = self.get_selected()
        if ref:
            pos = self.find_index(ref)
            if pos > 0 :
                self._move_up(pos, ref)
                
    def down_button_clicked(self, obj):
        ref = self.get_selected()
        if ref:
            pos = self.find_index(ref)
            if pos >= 0 and pos < len(self.get_data())-1:
                self._move_down(pos, ref)

    def build_interface(self):
        """
        Builds the interface, instantiating a gtk.TreeView in a
        gtk.ScrolledWindow.
        """

        # create the tree, turn on rule hinting and connect the
        # button press to the double click function.
        
        self.tree = gtk.TreeView()
        self.tree.set_reorderable(True)
        self.tree.set_rules_hint(True)
        self.tree.connect('button_press_event', self.double_click)
        self.tree.connect('key_press_event', self.key_pressed)
        self.track_ref_for_deletion("tree")

        # create the scrolled window, and attach the treeview
        scroll = gtk.ScrolledWindow()
        scroll.set_shadow_type(gtk.SHADOW_IN)
        scroll.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
        scroll.add(self.tree)
        self.pack_end(scroll, True)

    def get_selected(self):
        """
        Return the value associated with selected row in the model,
        based of the _HANDLE_COL value. Each model must define this
        to indicate what the returned value should be. If no selection
        has been made, None is returned.
        """
        (model, node) = self.selection.get_selected()
        if node:
            return model.get_value(node, self._HANDLE_COL)
        return None

    def is_empty(self):
        """
        Return True if the get_data returns a length greater than
        0. Typically, get_data returns the list of associated data.
        """
        return len(self.get_data()) == 0
    
    def get_data(self):
        """
        Return the data associated with the list. This is typically
        a list of objects.

        This should be overridden in the derived classes.
        """
        raise NotImplementedError

    def column_order(self):
        """
        Specifies the column order for the columns. This should be
        in the format of a list of tuples, in the format of (int,int),
        where the first in indicates if the column is visible, and the
        second column indicates the index into the model.

        This should be overridden in the derived classes.
        """
        raise NotImplementedError

    def build_columns(self):
        """
        Builds the columns and inserts them into the TreeView. Any
        previous columns exist, they will be in the self.columns array,
        and removed. 
        """

        # remove any existing columns, which would be stored in
        # self.columns
        
        map(self.tree.remove_column, self.columns)
        self.columns = []

        # loop through the values returned by column_order
        
        for pair in self.column_order():

            # if the first value isn't 1, then we skip the values
            if not pair[0]:
                continue

            # extract the name from the _column_names variable, and
            # assign it to the column name. The text value is extracted
            # from the model column specified in pair[1]
            name = self._column_names[pair[1]][0]
            renderer = gtk.CellRendererText()
            renderer.set_property('ellipsize', pango.ELLIPSIZE_END)
            if self._column_names[pair[1]][3] == 0:
                column = gtk.TreeViewColumn(name, renderer, text=pair[1])
            else:
                column = gtk.TreeViewColumn(name, renderer, markup=pair[1])
            if not self._column_names[pair[1]][4] == -1:
                #apply weight attribute
                column.add_attribute(renderer, "weight", 
                                     self._column_names[pair[1]][4])

            # insert the colum into the tree
            column.set_resizable(True)
            column.set_clickable(True)
            column.set_expand(True)
            column.set_min_width(self._column_names[pair[1]][2])
            column.set_sort_column_id(self._column_names[pair[1]][1])
            self.columns.append(column)
            self.tree.append_column(column)
        self.track_ref_for_deletion("columns")

    def construct_model(self):
        """
        Method that creates the model using the passed build_model parameter
        """
        return self.build_model(self.get_data(), self.dbstate.db)
        
    def rebuild(self):
        """
        Rebuilds the data in the database by creating a new model,
        using the build_model function passed at creation time.
        """
        offset = self.tree.get_visible_rect()
        #during rebuild, don't do _selection_changed
        self.dirty_selection = True
        (model, node) = self.selection.get_selected()
        selectedpath = None
        if node:
            selectedpath = model.get_path(node)
        if self.model and hasattr(self.model, 'destroy'):
            self.tree.set_model(None)
            self.model.destroy()
        try:
            self.model = self.construct_model()
        except AttributeError, msg:
            from QuestionDialog import RunDatabaseRepair
            import traceback
            traceback.print_exc()
            RunDatabaseRepair(str(msg))
            return

        self.tree.set_model(self.model)
        #reset previous select
        if not selectedpath is None:
            self.selection.select_path(selectedpath)
        #self.selection.select_path(node)
        self._set_label()
        #model and tree are reset, allow _selection_changed again, and force it
        self.dirty_selection = False
        self._selection_changed()
        if self.tree.flags() & gtk.REALIZED:
            gobject.idle_add(self.tree.scroll_to_point, offset.x, offset.y)
        self.post_rebuild(selectedpath)
    
    def post_rebuild(self, prebuildpath):
        """
        Allow post rebuild embeddedlist specific handling. 
        @param prebuildpath: path selected before rebuild, None if none
        @type prebuildpath: tree path
        """
        pass
    
    def rebuild_callback(self):
        """
        The view must be remade when data changes outside this tab.
        Use this method to connect to after a db change. It makes sure the 
        data is obtained again from the present object and the db what is not
        present in the obj, and the view rebuild
        """
        self.changed = True
        self.rebuild()
