import argparse
import logging.handlers
import os
import webbrowser
import sys

from twisted.web import server, guard
from twisted.internet import defer, reactor, error
from twisted.cred import portal
from jsonrpc.proxy import JSONRPCProxy

from lbrynet.lbrynet_daemon.auth.auth import PasswordChecker, HttpPasswordRealm
from lbrynet.lbrynet_daemon.auth.util import initialize_api_key_file
from lbrynet import conf
from lbrynet.core import log_support
from lbrynet.core import utils
from lbrynet.lbrynet_daemon.DaemonServer import DaemonServer
from lbrynet.lbrynet_daemon.DaemonRequest import DaemonRequest
from lbrynet.conf import settings


log = logging.getLogger(__name__)


def test_internet_connection():
    return utils.check_connection()


def stop():
    def _disp_shutdown():
        print "Shutting down lbrynet-daemon from command line"
        log.info("Shutting down lbrynet-daemon from command line")

    def _disp_not_running():
        print "Attempt to shut down lbrynet-daemon from command line when daemon isn't running"
        log.info("Attempt to shut down lbrynet-daemon from command line when daemon isn't running")

    d = defer.Deferred(None)
    d.addCallback(lambda _: JSONRPCProxy.from_url(settings.API_CONNECTION_STRING).stop())
    d.addCallbacks(lambda _: _disp_shutdown(), lambda _: _disp_not_running())
    d.callback(None)


def start():
    parser = argparse.ArgumentParser(description="Launch lbrynet-daemon")
    parser.add_argument("--wallet",
                        help="lbrycrd or lbryum, default lbryum",
                        type=str,
                        default='lbryum')
    parser.add_argument("--ui", help="path to custom UI folder", default=None)
    parser.add_argument(
        "--branch",
        help='Branch of lbry-web-ui repo to use, defaults to {}'.format(settings.ui_branch),
        default=settings.ui_branch)
    parser.add_argument('--no-launch', dest='launchui', action="store_false")
    parser.add_argument("--http-auth", dest="useauth", action="store_true")
    parser.add_argument(
        '--log-to-console', dest='logtoconsole', action='store_true',
        help=('Set to enable console logging. Set the --verbose flag '
              ' to enable more detailed console logging'))
    parser.add_argument(
        '--quiet', dest='quiet', action="store_true",
        help=('If log-to-console is not set, setting this disables all console output. '
              'If log-to-console is set, this argument is ignored'))
    parser.add_argument(
        '--verbose', nargs="*",
        help=('Enable debug output. Optionally specify loggers for which debug output '
              'should selectively be applied.'))
    args = parser.parse_args()

    utils.setup_certs_for_windows()

    conf.update_settings_from_file()
    update_settings_from_args(args)

    lbrynet_log = settings.get_log_filename()
    log_support.configure_logging(lbrynet_log, args.logtoconsole, args.verbose)
    log.debug('Final Settings: %s', settings.__dict__)

    try:
        JSONRPCProxy.from_url(settings.API_CONNECTION_STRING).is_running()
        log.info("lbrynet-daemon is already running")
        if not args.logtoconsole:
            print "lbrynet-daemon is already running"
        return
    except:
        pass

    log.info("Starting lbrynet-daemon from command line")

    if not args.logtoconsole and not args.quiet:
        print "Starting lbrynet-daemon from command line"
        print "To view activity, view the log file here: " + lbrynet_log
        print "Web UI is available at http://%s:%i" % (settings.API_INTERFACE, settings.api_port)
        print "JSONRPC API is available at " + settings.API_CONNECTION_STRING
        print "To quit press ctrl-c or call 'stop' via the API"

    if test_internet_connection():
        start_server_and_listen(args.launchui, args.useauth)
        reactor.run()

        if not args.logtoconsole and not args.quiet:
            print "\nClosing lbrynet-daemon"
    else:
        log.info("Not connected to internet, unable to start")
        if not args.logtoconsole:
            print "Not connected to internet, unable to start"
        return


def update_settings_from_args(args):
    to_pass = {}
    if args.ui:
        to_pass['local_ui_path'] = args.ui
    if args.branch:
        to_pass['ui_branch'] = args.branch
    to_pass['use_auth_http'] = args.useauth
    to_pass['wallet_type'] = args.wallet
    settings.update(to_pass)


def log_and_kill(failure):
    log_support.failure(failure, log, 'Failed to startup: %s')
    reactor.callFromThread(reactor.stop)


def start_server_and_listen(launchui, use_auth):
    """The primary entry point for launching the daemon.

    Args:
        launchui: set to true to open a browser window
        use_auth: set to true to enable http authentication
        kwargs: passed along to `DaemonServer().start()`
    """
    lbry = DaemonServer()
    d = lbry.start()
    d.addCallback(lambda _: listen(lbry, use_auth))
    if launchui:
        d.addCallback(lambda _: webbrowser.open(settings.UI_ADDRESS))
    d.addErrback(log_and_kill)


def listen(lbry, use_auth):
    site_base = get_site_base(use_auth, lbry.root)
    lbrynet_server = server.Site(site_base)
    lbrynet_server.requestFactory = DaemonRequest
    try:
        reactor.listenTCP(settings.api_port, lbrynet_server, interface=settings.API_INTERFACE)
    except error.CannotListenError:
        log.info('Daemon already running, exiting app')
        sys.exit(1)


def get_site_base(use_auth, root):
    if use_auth:
        log.info("Using authenticated API")
        return create_auth_session(root)
    else:
        log.info("Using non-authenticated API")
        return server.Site(root)


def create_auth_session(root):
    pw_path = os.path.join(settings.data_dir, ".api_keys")
    initialize_api_key_file(pw_path)
    checker = PasswordChecker.load_file(pw_path)
    realm = HttpPasswordRealm(root)
    portal_to_realm = portal.Portal(realm, [checker, ])
    factory = guard.BasicCredentialFactory('Login to lbrynet api')
    _lbrynet_server = guard.HTTPAuthSessionWrapper(portal_to_realm, [factory, ])
    return _lbrynet_server


if __name__ == "__main__":
    start()