'''
fdroidapk - F-Droid APK downloader
==================================

> fdroidapk package_names <flags>

package_names:
    One or more package names to download, separated by spaces. You can find
    the package name in the URL on f-droid.org.
    For example, com.nutomic.syncthingandroid from the URL
    https://f-droid.org/en/packages/com.nutomic.syncthingandroid/

--destination path:
    Alternative path to download the apk files to. Default is cwd.

--folders:
    If provided, each apk will be downloaded into a separate folder named after
    the package.

--debug:
    Add this flag to see more detailed information.

--operatornotify:
    Add this flag to get any warning messages sent to your operatornotify.
    See voussoirkit.operatornotify.py for details.
'''
import argparse
import bs4
import requests
import sys
import time

from voussoirkit import backoff
from voussoirkit import betterhelp
from voussoirkit import downloady
from voussoirkit import operatornotify
from voussoirkit import pathclass
from voussoirkit import vlogging

log = vlogging.getLogger(__name__, 'fdroidapk')

session = requests.Session()

def get_apk_url(package_name):
    url = f'https://f-droid.org/en/packages/{package_name}'
    log.debug('Downloading page %s', url)
    response = session.get(url, timeout=30)
    response.raise_for_status()
    soup = bs4.BeautifulSoup(response.text, 'html.parser')
    li = soup.find('li', {'class': 'package-version'})
    aa = li.find_all('a')
    aa = [a for a in aa if a.get('href', '').endswith('.apk')]
    apk_url = aa[0]['href']
    return apk_url

def normalize_package_name(package_name):
    package_name = package_name.strip()
    # If it happens to be a URL.
    package_name = package_name.strip('/')
    package_name = package_name.rsplit('/', 1)[-1]
    return package_name

def _retry_request(f, tries=5):
    bo = backoff.Linear(m=3, b=3, max=30)
    while tries > 0:
        try:
            return f()
        except requests.exceptions.ConnectionError as exc:
            if tries == 1:
                raise exc
            log.debug(exc)
            time.sleep(bo.next())
        tries -= 1

def fpk_argparse(args):
    destination = pathclass.Path(args.destination)
    destination.assert_is_directory()

    return_status = 0

    for package in args.packages:
        package = normalize_package_name(package)

        try:
            apk_url = _retry_request(lambda: get_apk_url(package))
        except Exception:
            log.error('%s was unable to get apk url.', package)
            return_status = 1
            continue

        apk_basename = downloady.basename_from_url(apk_url)
        if args.folders:
            this_dest = destination.with_child(package)
            this_dest.makedirs(exist_ok=True)
        else:
            this_dest = destination
        this_dest = this_dest.with_child(apk_basename)

        if this_dest.exists:
            log.info('%s exists.', this_dest.absolute_path)
            continue

        log.info('Downloading %s.', this_dest.absolute_path)

        try:
            _retry_request(lambda: downloady.download_file(
                apk_url,
                this_dest,
                callback_progress=downloady.Progress2,
                timeout=30,
            ))
        except Exception:
            log.error('%s was unable to download apk.', package)
            return_status = 1
            continue

    return return_status

@vlogging.main_decorator
def main(argv):
    (notify_context, argv) = operatornotify.main_log_context(argv, subject='fdroidapk warnings')

    parser = argparse.ArgumentParser(description=__doc__)

    parser.add_argument('packages', nargs='+')
    parser.add_argument('--folders', action='store_true')
    parser.add_argument('--destination', default='.')
    parser.set_defaults(func=fpk_argparse)

    with notify_context:
        return betterhelp.single_main(argv, parser, __doc__)

if __name__ == '__main__':
    raise SystemExit(main(sys.argv[1:]))