import json
from hashlib import sha1
from os.path import expanduser

import flickrapi


def setup_flickr(api_key, api_secret):
    flickr = flickrapi.FlickrAPI(api_key, api_secret)

    token, frob = flickr.get_token_part_one(perms='write')
    if not token:
        raw_input("Press ENTER after you authorized this program")

    flickr.get_token_part_two((token, frob))
    return flickr


def get_photo_signature(flickr, photo_id):
    info = flickr.photos_getInfo(photo_id=photo_id).find('photo')
    exif = flickr.photos_getExif(photo_id=photo_id).find('photo')

    if not info or not exif:
        raise InvalidPhotoIdError(photo_id)

    return [
        info.get('originalformat'), info.find('owner').get('location'),
        info.find('dates').get('taken')
    ] + sorted(
        (e.get('label'), e.get('tag'), e.get('tagspace'), e.get('tagspaceid'),
         e.find('raw').text) for e in exif.findall('exif')
    )


def get_photo_sha1sum(flickr, photo_id):
    return sha1(str(get_photo_signature(flickr, photo_id)))


def get_flickr_from_rc_file(rc_file=expanduser('~/.flickrscripts.json')):
    rc_conf = json.load(open(rc_file))
    return setup_flickr(rc_conf['APIKEY'], rc_conf['APISECRET'])


class InvalidPhotoIdError(ValueError):
    pass