'''
This file is the gevent launcher for local / development use.
'''
import gevent.monkey; gevent.monkey.patch_all()
import werkzeug.middleware.proxy_fix

import argparse
import gevent.pywsgi
import os
import sys

from voussoirkit import betterhelp
from voussoirkit import operatornotify
from voussoirkit import pathclass
from voussoirkit import vlogging

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

import bringrss
import backend

site = backend.site
site.wsgi_app = werkzeug.middleware.proxy_fix.ProxyFix(site.wsgi_app)
site.debug = True

HTTPS_DIR = pathclass.Path(__file__).parent.with_child('https')

####################################################################################################

def bringrss_flask_dev(
        *,
        demo_mode,
        localhost_only,
        init,
        port,
        use_https,
    ):
    if use_https is None:
        use_https = port == 443

    if use_https:
        http = gevent.pywsgi.WSGIServer(
            listener=('0.0.0.0', port),
            application=site,
            keyfile=HTTPS_DIR.with_child('bringrss.key').absolute_path,
            certfile=HTTPS_DIR.with_child('bringrss.crt').absolute_path,
        )
    else:
        http = gevent.pywsgi.WSGIServer(
            listener=('0.0.0.0', port),
            application=site,
        )

    if localhost_only:
        log.info('Setting localhost_only = True')
        site.localhost_only = True

    if demo_mode:
        log.info('Setting demo_mode = True')
        site.demo_mode = True

    if init:
        bringrss.bringdb.BringDB(create=True).commit()

    try:
        backend.common.init_bringdb()
    except bringrss.exceptions.NoClosestBringDB as exc:
        log.error(exc.error_message)
        log.error('Try adding --init to create the database.')
        return 1

    message = f'Starting server on port {port}, pid={os.getpid()}.'
    if use_https:
        message += ' (https)'
    log.info(message)

    backend.common.start_background_threads()

    try:
        http.serve_forever()
    except KeyboardInterrupt:
        log.info('Goodbye')
        return 0

def bringrss_flask_dev_argparse(args):
    return bringrss_flask_dev(
        demo_mode=args.demo_mode,
        localhost_only=args.localhost_only,
        init=args.init,
        port=args.port,
        use_https=args.use_https,
    )

@operatornotify.main_decorator(subject='bringrss_flask_dev', notify_every_line=True)
@vlogging.main_decorator
def main(argv):
    parser = argparse.ArgumentParser(
        description='''
        This file is the gevent launcher for local / development use.
        ''',
    )
    parser.add_argument(
        'port',
        nargs='?',
        type=int,
        default=27464,
        help='''
        Port number on which to run the server.
        ''',
    )
    parser.add_argument(
        '--https',
        dest='use_https',
        action='store_true',
        help='''
        If this flag is not passed, HTTPS will automatically be enabled if the
        port is 443. You can pass this flag to enable HTTPS on other ports.
        We expect to find bringrss.key and bringrss.crt in
        frontends/bringrss_flask/https.
        ''',
    )
    parser.add_argument(
        '--demo_mode',
        '--demo-mode',
        action='store_true',
        help='''
        If this flag is passed, the server operates in demo mode, which means
        absolutely nothing can make modifications to the database and it is safe
        to present to the world.
        ''',
    )
    parser.add_argument(
        '--init',
        action='store_true',
        help='''
        Create a new BringRSS database in the current folder. If this is your
        first time running the server, you should include this.
        ''',
    )
    parser.add_argument(
        '--localhost_only',
        '--localhost-only',
        action='store_true',
        help='''
        If this flag is passed, only localhost will be able to access the server.
        Other users on the LAN will be blocked.
        ''',
    )
    parser.set_defaults(func=bringrss_flask_dev_argparse)

    return betterhelp.go(parser, argv)

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