# Copyright (C) 2009  Lars Wirzenius <liw@liw.fi>
# 
# 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 3 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, see <http://www.gnu.org/licenses/>.


# This is necessary for running under Python 2.5, which we need to
# do on Debian, for now.
from __future__ import with_statement


import os
import shutil

import gtk

import dimbola


class RotatePhotos(dimbola.Plugin):

    '''Rotate selected photos in 90 degree steps.'''

    def __init__(self, mwc):
        self.mwc = mwc
        
    def enable(self): # pragma: no cover
        self.mwc.add_to_menu('photo_menu', 'rotate_90_left_menuitem', 
                             'Rotate photos left')
        self.mwc.add_to_menu('photo_menu', 'rotate_90_right_menuitem', 
                             'Rotate photos right')
        
    def disable(self): # pragma: no cover
        self.mwc.remove_from_menu('file_menu', 'rotate_90_left_menuitem')
        self.mwc.remove_from_menu('file_menu', 'rotate_90_right_menuitem')

    def new_angle(self, old_angle, step):
        '''Compute angle given old angle and number of steps.
        
        Positive steps are clockwise, negative steps are counter-clockwise.
        
        '''
        angles = [0, 90, 180, 270]
        try:
            i = angles.index(old_angle)
        except ValueError:
            return 0
        else:
            return (angles + angles)[i - step]
    
    def rotate(self, step): # pragma: no cover
        with self.mwc.db:
            for photoid in self.mwc.grid.model.selected:
                a, b, c, angle = self.mwc.db.get_basic_photo_metadata(photoid)
                self.mwc.db.set_rotate(photoid, self.new_angle(angle, step))
                new_value = self.new_angle(angle, step)
        for photoid in self.mwc.grid.model.selected:
            self.mwc.photo_meta_changed(photoid)
        
    def on_rotate_90_left_menuitem_activate(self, menuitem): #pragma: no cover
        self.rotate(-1)

    def on_rotate_90_right_menuitem_activate(self, menuitem): #pragma: no cover
        self.rotate(1)

    def menuitem_is_sensitive(self): # pragma: no cover
        return self.mwc.grid.model.selected

    rotate_90_left_menuitem_is_sensitive = menuitem_is_sensitive
    rotate_90_right_menuitem_is_sensitive = menuitem_is_sensitive