#    Copyright 2016 Mirantis, Inc.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import netaddr

from collections import defaultdict

from datetime import datetime
from pepper import libpepper
from tcp_tests.helpers import utils
from tcp_tests import logger
from tcp_tests import settings
from tcp_tests.managers.execute_commands import ExecuteCommandsMixin

LOG = logger.logger


class SaltManager(ExecuteCommandsMixin):
    """docstring for SaltManager"""

    __config = None
    __underlay = None
    _map = {
        'enforceState': 'enforce_state',
        'enforceStates': 'enforce_states',
        'runState': 'run_state',
        'runStates': 'run_states',
    }

    def __init__(self, config, underlay, host=None, port='6969',
                 username=None, password=None):
        self.__config = config
        self.__underlay = underlay
        self.__port = port
        self.__host = host
        self.__api = None
        self.__user = username or settings.SALT_USER
        self.__password = password or settings.SALT_PASSWORD
        self._salt = self

        super(SaltManager, self).__init__(config=config, underlay=underlay)

    def install(self, commands):
        # if self.__config.salt.salt_master_host == '0.0.0.0':
        #    # Temporary workaround. Underlay should be extended with roles
        #    salt_nodes = self.__underlay.node_names()
        #    self.__config.salt.salt_master_host = \
        #        self.__underlay.host_by_node_name(salt_nodes[0])

        self.execute_commands(commands=commands,
                              label="Install and configure salt")

    def change_creds(self, username, password):
        self.__user = username
        self.__password = password

    @property
    def port(self):
        return self.__port

    @property
    def host(self):
        if self.__host:
            return self.__host
        else:
            # TODO(ddmitriev): consider to add a check and raise
            # exception if 'salt_master_host' is not initialized.
            return self.__config.salt.salt_master_host

    @property
    def api(self):
        def login():
            LOG.info("Authentication in Salt API")
            self.__api.login(
                username=self.__user,
                password=self.__password,
                eauth='pam')
            return datetime.now()

        if self.__api:
            if (datetime.now() - self.__session_start).seconds < 5 * 60:
                return self.__api
            else:
                # FIXXME: Change to debug
                LOG.info("Session's expired")
                self.__session_start = login()
                return self.__api

        url = "http://{host}:{port}".format(
            host=self.host, port=self.port)
        LOG.info("Connecting to Salt API {0}".format(url))
        self.__api = libpepper.Pepper(url)
        self.__session_start = login()
        return self.__api

    def local(self, tgt, fun, args=None, kwargs=None, timeout=None):
        return self.api.local(tgt, fun, args, kwargs, timeout=timeout,
                              expr_form='compound')

    def local_async(self, tgt, fun, args=None, kwargs=None, timeout=None):
        return self.api.local_async(tgt, fun, args, kwargs, timeout=timeout)

    def lookup_result(self, jid):
        return self.api.lookup_jid(jid)

    def check_result(self, r):
        if len(r.get('return', [])) == 0:
            raise LookupError("Result is empty or absent")

        result = r['return'][0]
        if len(result) == 0:
            raise LookupError("Result is empty or absent")
        LOG.info("Job has result for %s nodes", result.keys())
        fails = defaultdict(list)
        for h in result:
            host_result = result[h]
            LOG.info("On %s executed:", h)
            if isinstance(host_result, list):
                fails[h].append(host_result)
                continue
            for t in host_result:
                task = host_result[t]
                if task['result'] is False:
                    fails[h].append(task)
                    LOG.error("%s - %s", t, task['result'])
                else:
                    LOG.info("%s - %s", t, task['result'])

        return fails if fails else None

    def enforce_state(self, tgt, state, args=None, kwargs=None, timeout=None):
        r = self.local(tgt=tgt, fun='state.sls', args=state, timeout=timeout)
        f = self.check_result(r)
        return r, f

    def enforce_states(self, tgt, state, args=None, kwargs=None, timeout=None):
        rets = []
        for s in state:
            r = self.enforce_state(tgt=tgt, state=s, timeout=timeout)
            rets.append(r)
        return rets

    def run_state(self, tgt, state, args=None, kwargs=None, timeout=None):
        return self.local(tgt=tgt, fun=state, args=args, kwargs=kwargs,
                          timeout=timeout), None

    def run_states(self, tgt, state, args=None, kwargs=None, timeout=None):
        rets = []
        for s in state:
            r = self.run_state(tgt=tgt, state=s, args=args, kwargs=kwargs,
                               timeout=timeout)
            rets.append(r)
        return rets

    def get_pillar(self, tgt, pillar):
        result = self.local(tgt=tgt, fun='pillar.get', args=pillar)
        return result['return']

    def get_grains(self, tgt, grains):
        result = self.local(tgt=tgt, fun='grains.get', args=grains)
        return result['return']

    def get_ssh_data(self):
        """Generate ssh config for Underlay

        :param roles: list of strings
        """

        pool_name = self.__config.underlay.net_mgmt
        pool_net = netaddr.IPNetwork(self.__config.underlay.address_pools[
            self.__config.underlay.net_mgmt])
        hosts = self.local('*', 'grains.item', ['host', 'ipv4'])

        if len(hosts.get('return', [])) == 0:
            raise LookupError("Hosts is empty or absent")
        hosts = hosts['return'][0]
        if len(hosts) == 0:
            raise LookupError("Hosts is empty or absent")

        def host(minion_id, ip):
            return {
                'roles': ['salt_minion'],
                'keys': [
                    k['private'] for k in self.__config.underlay.ssh_keys
                ],
                'node_name': minion_id,
                'minion_id': minion_id,
                'host': ip,
                'address_pool': pool_name,
                'login': settings.SSH_NODE_CREDENTIALS['login'],
                'password': settings.SSH_NODE_CREDENTIALS['password']
            }

        try:
            ret = [
                host(k, next(i for i in v['ipv4'] if i in pool_net))
                for k, v in hosts.items()
                if next(i for i in v['ipv4'] if i in pool_net)]
            LOG.debug("Fetched ssh data from salt grains - {}".format(ret))
            return ret
        except StopIteration:
            msg = ("Can't match nodes ip address with network cidr\n"
                   "Managment network - {net}\n"
                   "Host with address - {host_list}".format(
                       net=pool_net,
                       host_list={k: v['ipv4'] for k, v in hosts.items()}))
            raise StopIteration(msg)

    def update_ssh_data_from_minions(self):
        """Combine existing underlay.ssh with VCP salt minions"""
        salt_nodes = self.get_ssh_data()

        for salt_node in salt_nodes:
            nodes = [n for n in self.__config.underlay.ssh
                     if salt_node['host'] == n['host']
                     and salt_node['address_pool'] == n['address_pool']]
            if nodes:
                # Assume that there can be only one node with such IP address
                # Just update minion_id for this node
                nodes[0]['minion_id'] = salt_node['minion_id']
            else:
                # New node, add to config.underlay.ssh
                self.__config.underlay.ssh.append(salt_node)

        self.__underlay.config_ssh = []
        self.__underlay.add_config_ssh(self.__config.underlay.ssh)

    def service_status(self, tgt, service):
        result = self.local(tgt=tgt, fun='service.status', args=service)
        return result['return']

    def service_restart(self, tgt, service):
        result = self.local(tgt=tgt, fun='service.restart', args=service)
        return result['return']

    def service_stop(self, tgt, service):
        result = self.local(tgt=tgt, fun='service.stop', args=service)
        return result['return']

    @utils.retry(3, exception=libpepper.PepperException)
    def sync_time(self, tgt='*'):
        LOG.info("NTP time sync on the salt minions '{0}'".format(tgt))
        # Force authentication update on the next API access
        # because previous authentication most probably is not valid
        # before or after time sync.
        self.__api = None
        self.run_state(
            tgt,
            'cmd.run', 'service ntp stop; if [ -x /usr/sbin/ntpdate ]; then ntpdate -s ntp.ubuntu.com; else ntpd -gq ; fi; service ntp start')  # noqa
        new_time_res = self.run_state(tgt, 'cmd.run', 'date')
        for node_name, time in sorted(new_time_res[0]['return'][0].items()):
            LOG.info("{0}: {1}".format(node_name, time))
        self.__api = None