#!/usr/bin/env python3

import warnings
warnings.filterwarnings("ignore", category=DeprecationWarning)

import re
import requests
import logging

from mdf import retronews
from argparse import ArgumentParser



if __name__ == '__main__':
    parser = ArgumentParser()
    parser.add_argument('--url', type=str, required=True)
    parser.add_argument('--output', type=str, required=True,
                        help='output directory')
    parser.add_argument('--merge-threads', default=retronews.TILE_MERGING_POOL_SIZE, type=int)
    parser.add_argument('--fetch-threads', default=retronews.PAGE_FETCHING_POOL_SIZE, type=int)
    parser.add_argument('--continue-prev', action='store_true',
                        help='keep scrapping backwards in time')
    parser.add_argument('--continue-next', action='store_true',
                        help='keep scrapping forwards in time')
    parser.add_argument('--only-fetch', action='store_true',
                        help='only fetch magazine tiles and exit, do not merge anything')
    parser.add_argument('--force-overwrite', action='store_true',
                        help='if file yyyy-mm-dd.pdf already exists, delete it and start over')
    parser.add_argument('--force-probe', action='store_true',
                        help='force all pages to use the \'probe\' method')
    parser.add_argument('--fetch-probe-pages', nargs='+', type=int,
                        help='force some pages to use the \'probe\' method, when count of vertical and horizontal tiles is unknown')

    args = parser.parse_args()

    with_continuation = args.continue_prev or args.continue_next
    if args.fetch_probe_pages and with_continuation:
        raise RuntimeError('--fetch-probe-pages cannot be used together with --continue-* options, it\'s a one time hack')
    if args.only_fetch and with_continuation:
        raise RuntimeError('--only-fetch cannot be used together with --continue-* options, it\'s a one time hack')

    TILE_MERGING_POOL_SIZE = args.merge_threads
    PAGE_FETCHING_POOL_SIZE = args.fetch_threads

    url = args.url
    while True:
        print(f'grabbing {url}...')
        if not retronews.grab_magazine(url,
                                       output_root=args.output,
                                       probe_pages=args.fetch_probe_pages,
                                       probe_all=args.force_probe,
                                       only_fetch=args.only_fetch,
                                       force_overwrite=args.force_overwrite):
            logging.error('failed to grab')
            break

        if not args.continue_prev and not args.continue_next:
            break

        r = requests.get(url)

        try:
            next_url = None
            if args.continue_next:
                next_url = re.search(r'<a class="float-right pt-4 text-secondary" href="([^"]+)">SUIVANT', r.text, re.S).groups()[0]
            elif args.continue_prev:
                next_url = re.search(r'<a class="float-left pt-4 text-secondary" href="([^"]+)"><i class="fa fa-chevron-left">\s+</i>\s+PRÉCÉDENT</a>', r.text, re.S).groups()[0]

            if not next_url:
                break

            if next_url.startswith('/'):
                next_url = f'https://www.retronews.fr{next_url}'

            url = next_url

        except:
            print('error: failed to find previous link! exiting')
            break