import argparse
import json
import logging
import sys
from datetime import datetime, timedelta
from os.path import expanduser

from flickrscripts.common import setup_flickr


class TimeWarper(object):
    flickr = None
    _base_query_args = dict(user_id='me', page=1)

    def __init__(self, api_key, api_secret):
        self.flickr = setup_flickr(api_key, api_secret)
        self.log = logging.getLogger(self.__class__.__name__)
        self.log.level = logging.INFO

    def run(self, set_to_date, **query_args):
        self.log.info(
            'Setting upload dates for photos matching query %r', query_args
        )
        query = self._base_query_args.copy()
        query.update(query_args)

        for i, page in self._get_pages(query):
            self.log.info('Processing page %s, attributes=%r',
                         i, page.attrib)
            self._set_upload_date_for_photos(i, page, set_to_date)

        return 0

    def _set_upload_date_for_photos(self, pagenum, page, set_to_date):
        for i, photo in enumerate(page.findall('photos/photo')):
            setdate_response = self.flickr.photos_setDates(
                photo_id=photo.attrib['id'],
                date_posted=set_to_date
            )
            self.log.info('page %s photo %s: response attribs=%s',
                  pagenum, i, setdate_response.attrib)

    def _get_pages(self, query):
        self.log.info('Getting pages for query %r', query)
        i = 1
        while True:
            page = self.flickr.photos_search(**query)
            if len(page.findall('photos/photo')):
                yield i, page
                i += 1
            else:
                raise StopIteration


def main(sysargs=sys.argv[:]):
    parser = argparse.ArgumentParser(
        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
        prog='flickrscripts timewarp')
    parser.add_argument('set_to_date')
    parser.add_argument('-q', '--search-query-param', default=[],
        action='append', help='Add a key=value param to the search query list')

    parser.add_argument(
        '-c', '--rcfile', default=expanduser('~/.flickrscripts.json'),
        help='JSON file containing `APIKEY` and `APISECRET` keys',
        type=argparse.FileType('r')
    )

    args = parser.parse_args(sysargs[1:])
    rc_conf = json.load(args.rcfile)

    logging.basicConfig(level=logging.INFO, stream=sys.stdout)
    log = logging.getLogger('main')
    log.level = logging.INFO
    log.info('Preparing query args')

    query_args = {}
    for key_val in args.search_query_param:
        key, value = key_val.split('=', 1)
        query_args[key] = value

    if len(query_args.keys()) == 0:
        query_args = dict(
            min_upload_date=(datetime.now() + timedelta(days=-1)),
            max_upload_date=(datetime.now() + timedelta(days=1))
        )
        log.warn('No query arguments provided!  ' +
                 'Defaulting to %r', query_args)

    warper = TimeWarper(rc_conf['APIKEY'], rc_conf['APISECRET'])
    return warper.run(args.set_to_date, **query_args)


if __name__ == '__main__':
    sys.exit(main())