# 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 datetime
import hashlib
import os
import subprocess

import gtk
import pyexiv2

import dimbola


class ChecksumResult(dimbola.BackgroundStatus):

    def __init__(self, action, description, photoid, sha1):
        dimbola.BackgroundStatus.__init__(self, action, description)
        self.photoid = photoid
        self.sha1 = sha1
        
    def process_result(self, mwc):
        with mwc.db:
            mwc.db.set_sha1(self.photoid, self.sha1)


class ComputeChecksumJob(dimbola.BackgroundJob):

    '''Compute checksum for a specific photo.'''
    
    def __init__(self, photoid, pathname):
        self.photoid = photoid
        self.pathname = pathname
        
    def run(self):
        return ChecksumResult('stop', 'Checksum for %s' % self.pathname,
                              self.photoid, dimbola.sha1(self.pathname))


class ComputeChecksums(dimbola.Plugin):

    '''Compute checksums for original photo files.'''

    def __init__(self, mwc):
        self.mwc = mwc

    def enable(self):
        self.mwc.add_to_menu('file_menu', 'missing_checksums_menuitem', 
                             'Compute missing checksums')
        
    def disable(self):
        self.mwc.remove_from_menu('file_menu', 'missing_checksums_menuitem')
    
    def on_missing_checksums_menuitem_activate(self, *args):
        with self.mwc.db:
            photoids = self.mwc.db.find_photos_without_checksum()
            for photoid in photoids:
                pathname = self.mwc.db.get_photo_pathname(photoid)
                self.mwc.add_bgjob(ComputeChecksumJob(photoid, pathname))