import logging
import os

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

from lbrynet import conf
from lbrynet.daemon.Daemon import Daemon
from lbrynet.daemon.Resources import LBRYindex, HostedEncryptedFile, EncryptedFileUpload
from lbrynet.daemon.auth.auth import PasswordChecker, HttpPasswordRealm
from lbrynet.daemon.auth.util import initialize_api_key_file
from lbrynet.daemon.DaemonRequest import DaemonRequest


log = logging.getLogger(__name__)


class DaemonServer(object):
    def __init__(self, analytics_manager=None):
        self._api = None
        self.root = None
        self.server_port = None
        self.analytics_manager = analytics_manager

    def _setup_server(self, use_auth):
        ui_path = os.path.join(conf.settings.ensure_data_dir(), "lbry-ui", "active")
        self.root = LBRYindex(ui_path)
        self._api = Daemon(self.root, self.analytics_manager)
        self.root.putChild("view", HostedEncryptedFile(self._api))
        self.root.putChild("upload", EncryptedFileUpload(self._api))
        self.root.putChild(conf.settings['API_ADDRESS'], self._api)

        lbrynet_server = server.Site(get_site_base(use_auth, self.root))
        lbrynet_server.requestFactory = DaemonRequest

        try:
            self.server_port = reactor.listenTCP(
                conf.settings['api_port'], lbrynet_server, interface=conf.settings['api_host'])
        except error.CannotListenError:
            log.info('Daemon already running, exiting app')
            raise

        return defer.succeed(True)

    @defer.inlineCallbacks
    def start(self, use_auth):
        yield self._setup_server(use_auth)
        yield self._api.setup()

    @defer.inlineCallbacks
    def stop(self):
        if self._api is not None:
            yield self._api._shutdown()
        if self.server_port is not None:
            yield self.server_port.stopListening()


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(conf.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