import json
import os
import pytest
import requests
import signal
import time

from hashlib import sha512
from subprocess import call
from urlparse import urljoin

from leap.soledad.client import Soledad
from leap.soledad.common.couch import CouchDatabase


# we have to manually setup the events server in order to be able to signal
# events. This is usually done by the enclosing application using soledad
# client (i.e. bitmask client).
from leap.common.events import server
server.ensure_server()


def pytest_addoption(parser):
    parser.addoption(
        "--couch-url", type="string", default="http://127.0.0.1:5984",
        help="the url for the couch server to be used during tests")


#
# default options for all tests
#

DEFAULT_UUID = '0'
DEFAULT_PASSPHRASE = '123'

DEFAULT_URL = 'http://127.0.0.1:2424'
DEFAULT_PRIVKEY = 'soledad_privkey.pem'
DEFAULT_CERTKEY = 'soledad_certkey.pem'
DEFAULT_TOKEN = 'an-auth-token'


#
# soledad_dbs fixture: provides all databases needed by soledad server in a per
# module scope (same databases for all tests in this module).
#

def _token_dbname():
    dbname = 'tokens_' + \
        str(int(time.time() / (30 * 24 * 3600)))
    return dbname


class SoledadDatabases(object):

    def __init__(self, url):
        self._token_db_url = urljoin(url, _token_dbname())
        self._shared_db_url = urljoin(url, 'shared')

    def setup(self):
        self._create_dbs()
        self._add_token()

    def _create_dbs(self):
        requests.put(self._token_db_url)
        requests.put(self._shared_db_url)

    def _add_token(self):
        token = sha512(DEFAULT_TOKEN).hexdigest()
        content = {'type': 'Token', 'user_id': DEFAULT_UUID}
        requests.put(
            self._token_db_url + '/' + token, data=json.dumps(content))

    def teardown(self):
        requests.delete(self._token_db_url)
        requests.delete(self._shared_db_url)


@pytest.fixture(scope='module')
def soledad_dbs(request):
    couch_url = request.config.option.couch_url
    db = SoledadDatabases(couch_url)
    db.setup()
    request.addfinalizer(db.teardown)
    return db


#
# user_db fixture: provides an empty database for a given user in a per
# function scope.
#

class UserDatabase(object):

    def __init__(self, url):
        self._user_db_url = urljoin(url, 'user-%s' % DEFAULT_UUID)

    def setup(self):
        CouchDatabase.open_database(
            url=self._user_db_url, create=True, replica_uid=None)

    def teardown(self):
        requests.delete(self._user_db_url)


@pytest.fixture(scope='function')
def user_db(request):
    couch_url = request.config.option.couch_url
    db = UserDatabase(couch_url)
    db.setup()
    request.addfinalizer(db.teardown)
    return db


def get_pid(pidfile):
    if not os.path.isfile(pidfile):
        return 0
    try:
        with open(pidfile) as f:
            return int(f.read())
    except IOError:
        return 0


#
# soledad_server fixture: provides a running soledad server in a per module
# context (same soledad server for all tests in this module).
#

class SoledadServer(object):

    def __init__(self, tmpdir_factory, couch_url):
        tmpdir = tmpdir_factory.mktemp('soledad-server')
        self._pidfile = os.path.join(tmpdir.strpath, 'soledad-server.pid')
        self._logfile = os.path.join(tmpdir.strpath, 'soledad-server.log')
        self._couch_url = couch_url

    def start(self):
        self._create_conf_file()
        # start the server
        call([
            'twistd',
            '--logfile=%s' % self._logfile,
            '--pidfile=%s' % self._pidfile,
            'web',
            '--wsgi=leap.soledad.server.application',
            '--port=2424'
        ])

    def _create_conf_file(self):
        if not os.access('/etc', os.W_OK):
            return
        if not os.path.isdir('/etc/soledad'):
            os.mkdir('/etc/soledad')
        with open('/etc/soledad/soledad-server.conf', 'w') as f:
            content = '[soledad-server]\ncouch_url = %s' % self._couch_url
            f.write(content)

    def stop(self):
        pid = get_pid(self._pidfile)
        os.kill(pid, signal.SIGKILL)


@pytest.fixture(scope='module')
def soledad_server(tmpdir_factory, request):
    couch_url = request.config.option.couch_url
    server = SoledadServer(tmpdir_factory, couch_url)
    server.start()
    request.addfinalizer(server.stop)
    return server


#
# soledad_client fixture: provides a clean soledad client for a test function.
#

@pytest.fixture()
def soledad_client(tmpdir, soledad_server, user_db, soledad_dbs):
    uuid = DEFAULT_UUID
    passphrase = DEFAULT_PASSPHRASE
    secrets_path = os.path.join(tmpdir.strpath, '%s.secret' % uuid)
    local_db_path = os.path.join(tmpdir.strpath, '%s.db' % uuid)
    server_url = DEFAULT_URL
    token = DEFAULT_TOKEN

    # get a soledad instance
    return Soledad(
        uuid,
        unicode(passphrase),
        secrets_path=secrets_path,
        local_db_path=local_db_path,
        server_url=server_url,
        cert_file=None,
        auth_token=token,
        defer_encryption=True)