# Copyright (c) 2013 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 uuid

from oslo.config import cfg
import six

from sahara import conductor
from sahara import context
from sahara.openstack.common import log as logging
from sahara.plugins.general import exceptions as ex
from sahara.plugins.general import utils
from sahara.plugins.vanilla import abstractversionhandler as avm
from sahara.plugins.vanilla import utils as vu
from sahara.plugins.vanilla.v1_2_1 import config_helper as c_helper
from sahara.plugins.vanilla.v1_2_1 import run_scripts as run
from sahara.plugins.vanilla.v1_2_1 import scaling as sc
from sahara.topology import topology_helper as th
from sahara.utils import edp
from sahara.utils import files as f
from sahara.utils import general as g
from sahara.utils import remote


conductor = conductor.API
LOG = logging.getLogger(__name__)
CONF = cfg.CONF


class VersionHandler(avm.AbstractVersionHandler):
    def get_plugin_configs(self):
        return c_helper.get_plugin_configs()

    def get_node_processes(self):
        return {
            "HDFS": ["namenode", "datanode", "secondarynamenode"],
            "MapReduce": ["tasktracker", "jobtracker"],
            "JobFlow": ["oozie"],
            "Hive": ["hiveserver"]
        }

    def get_resource_manager_uri(self, cluster):
        return cluster['info']['MapReduce']['JobTracker']

    def get_oozie_server(self, cluster):
        return vu.get_oozie(cluster)

    def validate(self, cluster):
        nn_count = sum([ng.count for ng
                        in utils.get_node_groups(cluster, "namenode")])
        if nn_count != 1:
            raise ex.InvalidComponentCountException("namenode", 1, nn_count)

        jt_count = sum([ng.count for ng
                        in utils.get_node_groups(cluster, "jobtracker")])

        if jt_count not in [0, 1]:
            raise ex.InvalidComponentCountException("jobtracker", '0 or 1',
                                                    jt_count)

        oozie_count = sum([ng.count for ng
                           in utils.get_node_groups(cluster, "oozie")])

        if oozie_count not in [0, 1]:
            raise ex.InvalidComponentCountException("oozie", '0 or 1',
                                                    oozie_count)

        hive_count = sum([ng.count for ng
                          in utils.get_node_groups(cluster, "hiveserver")])
        if jt_count == 0:

            tt_count = sum([ng.count for ng
                            in utils.get_node_groups(cluster, "tasktracker")])
            if tt_count > 0:
                raise ex.RequiredServiceMissingException(
                    "jobtracker", required_by="tasktracker")

            if oozie_count > 0:
                raise ex.RequiredServiceMissingException(
                    "jobtracker", required_by="oozie")

            if hive_count > 0:
                raise ex.RequiredServiceMissingException(
                    "jobtracker", required_by="hive")

        if hive_count not in [0, 1]:
            raise ex.InvalidComponentCountException("hive", '0 or 1',
                                                    hive_count)

    def configure_cluster(self, cluster):
        instances = utils.get_instances(cluster)

        self._setup_instances(cluster, instances)

    def start_cluster(self, cluster):
        nn_instance = vu.get_namenode(cluster)
        with remote.get_remote(nn_instance) as r:
            run.format_namenode(r)
            run.start_processes(r, "namenode")

        for snn in vu.get_secondarynamenodes(cluster):
            run.start_processes(remote.get_remote(snn), "secondarynamenode")

        jt_instance = vu.get_jobtracker(cluster)
        if jt_instance:
            run.start_processes(remote.get_remote(jt_instance), "jobtracker")

        self._start_tt_dn_processes(utils.get_instances(cluster))

        self._await_datanodes(cluster)

        LOG.info("Hadoop services in cluster %s have been started" %
                 cluster.name)

        oozie = vu.get_oozie(cluster)
        if oozie:
            with remote.get_remote(oozie) as r:
                if c_helper.is_mysql_enable(cluster):
                    run.mysql_start(r, oozie)
                    run.oozie_create_db(r)
                run.oozie_share_lib(r, nn_instance.hostname())
                run.start_oozie(r)
                LOG.info("Oozie service at '%s' has been started",
                         nn_instance.hostname())

        hive_server = vu.get_hiveserver(cluster)
        if hive_server:
            with remote.get_remote(hive_server) as r:
                run.hive_create_warehouse_dir(r)
                run.hive_copy_shared_conf(
                    r, edp.get_hive_shared_conf_path('hadoop'))

                if c_helper.is_mysql_enable(cluster):
                    if not oozie or hive_server.hostname() != oozie.hostname():
                        run.mysql_start(r, hive_server)
                    run.hive_create_db(r)
                    run.hive_metastore_start(r)
                    LOG.info("Hive Metastore server at %s has been started",
                             hive_server.hostname())

        LOG.info('Cluster %s has been started successfully' % cluster.name)
        self._set_cluster_info(cluster)

    def _await_datanodes(self, cluster):
        datanodes_count = len(vu.get_datanodes(cluster))
        if datanodes_count < 1:
            return

        LOG.info("Waiting %s datanodes to start up" % datanodes_count)
        with remote.get_remote(vu.get_namenode(cluster)) as r:
            while True:
                if run.check_datanodes_count(r, datanodes_count):
                    LOG.info(
                        'Datanodes on cluster %s has been started' %
                        cluster.name)
                    return

                context.sleep(1)

                if not g.check_cluster_exists(cluster):
                    LOG.info(
                        'Stop waiting datanodes on cluster %s since it has '
                        'been deleted' % cluster.name)
                    return

    def _extract_configs_to_extra(self, cluster):
        oozie = vu.get_oozie(cluster)
        hive = vu.get_hiveserver(cluster)

        extra = dict()

        if hive:
            extra['hive_mysql_passwd'] = six.text_type(uuid.uuid4())

        for ng in cluster.node_groups:
            extra[ng.id] = {
                'xml': c_helper.generate_xml_configs(
                    cluster, ng, extra['hive_mysql_passwd'] if hive else None),
                'setup_script': c_helper.generate_setup_script(
                    ng.storage_paths(),
                    c_helper.extract_environment_confs(ng.configuration()),
                    append_oozie=(
                        oozie and oozie.node_group.id == ng.id)
                )
            }

        if c_helper.is_data_locality_enabled(cluster):
            topology_data = th.generate_topology_map(
                cluster, CONF.enable_hypervisor_awareness)
            extra['topology_data'] = "\n".join(
                [k + " " + v for k, v in topology_data.items()]) + "\n"

        return extra

    def decommission_nodes(self, cluster, instances):
        tts = vu.get_tasktrackers(cluster)
        dns = vu.get_datanodes(cluster)
        decommission_dns = False
        decommission_tts = False

        for i in instances:
            if 'datanode' in i.node_group.node_processes:
                dns.remove(i)
                decommission_dns = True
            if 'tasktracker' in i.node_group.node_processes:
                tts.remove(i)
                decommission_tts = True

        nn = vu.get_namenode(cluster)
        jt = vu.get_jobtracker(cluster)

        if decommission_tts:
            sc.decommission_tt(jt, instances, tts)
        if decommission_dns:
            sc.decommission_dn(nn, instances, dns)

    def validate_scaling(self, cluster, existing, additional):
        self._validate_existing_ng_scaling(cluster, existing)
        self._validate_additional_ng_scaling(cluster, additional)

    def scale_cluster(self, cluster, instances):
        self._setup_instances(cluster, instances)

        run.refresh_nodes(remote.get_remote(
            vu.get_namenode(cluster)), "dfsadmin")
        jt = vu.get_jobtracker(cluster)
        if jt:
            run.refresh_nodes(remote.get_remote(jt), "mradmin")

        self._start_tt_dn_processes(instances)

    def _start_tt_dn_processes(self, instances):
        tt_dn_names = ["datanode", "tasktracker"]

        with context.ThreadGroup() as tg:
            for i in instances:
                processes = set(i.node_group.node_processes)
                tt_dn_procs = processes.intersection(tt_dn_names)

                if tt_dn_procs:
                    tg.spawn('vanilla-start-tt-dn-%s' % i.instance_name,
                             self._start_tt_dn, i, list(tt_dn_procs))

    def _start_tt_dn(self, instance, tt_dn_procs):
        with instance.remote() as r:
            run.start_processes(r, *tt_dn_procs)

    def _setup_instances(self, cluster, instances):
        extra = self._extract_configs_to_extra(cluster)
        self._push_configs_to_nodes(cluster, extra, instances)

    def _push_configs_to_nodes(self, cluster, extra, new_instances):
        all_instances = utils.get_instances(cluster)
        with context.ThreadGroup() as tg:
            for instance in all_instances:
                if instance in new_instances:
                    tg.spawn('vanilla-configure-%s' % instance.instance_name,
                             self._push_configs_to_new_node, cluster,
                             extra, instance)
                else:
                    tg.spawn('vanilla-reconfigure-%s' % instance.instance_name,
                             self._push_configs_to_existing_node, cluster,
                             extra, instance)

    def _push_configs_to_new_node(self, cluster, extra, instance):
        ng_extra = extra[instance.node_group.id]
        private_key, public_key = c_helper.get_hadoop_ssh_keys(cluster)

        files = {
            '/etc/hadoop/core-site.xml': ng_extra['xml']['core-site'],
            '/etc/hadoop/mapred-site.xml': ng_extra['xml']['mapred-site'],
            '/etc/hadoop/hdfs-site.xml': ng_extra['xml']['hdfs-site'],
            '/tmp/sahara-hadoop-init.sh': ng_extra['setup_script'],
            'id_rsa': private_key,
            'authorized_keys': public_key
        }

        key_cmd = ('sudo mkdir -p /home/hadoop/.ssh/ && '
                   'sudo mv id_rsa authorized_keys /home/hadoop/.ssh && '
                   'sudo chown -R hadoop:hadoop /home/hadoop/.ssh && '
                   'sudo chmod 600 /home/hadoop/.ssh/{id_rsa,authorized_keys}')

        with remote.get_remote(instance) as r:
            # TODO(aignatov): sudo chown is wrong solution. But it works.
            r.execute_command(
                'sudo chown -R $USER:$USER /etc/hadoop'
            )
            r.execute_command(
                'sudo chown -R $USER:$USER /opt/oozie/conf'
            )
            r.write_files_to(files)
            r.execute_command(
                'sudo chmod 0500 /tmp/sahara-hadoop-init.sh'
            )
            r.execute_command(
                'sudo /tmp/sahara-hadoop-init.sh '
                '>> /tmp/sahara-hadoop-init.log 2>&1')

            r.execute_command(key_cmd)

            if c_helper.is_data_locality_enabled(cluster):
                r.write_file_to(
                    '/etc/hadoop/topology.sh',
                    f.get_file_text(
                        'plugins/vanilla/v1_2_1/resources/topology.sh'))
                r.execute_command(
                    'sudo chmod +x /etc/hadoop/topology.sh'
                )

            self._write_topology_data(r, cluster, extra)
            self._push_master_configs(r, cluster, extra, instance)

    def _push_configs_to_existing_node(self, cluster, extra, instance):
        node_processes = instance.node_group.node_processes
        need_update = (c_helper.is_data_locality_enabled(cluster) or
                       'namenode' in node_processes or
                       'jobtracker' in node_processes or
                       'oozie' in node_processes or
                       'hiveserver' in node_processes)

        if not need_update:
            return

        with remote.get_remote(instance) as r:
            self._write_topology_data(r, cluster, extra)
            self._push_master_configs(r, cluster, extra, instance)

    def _write_topology_data(self, r, cluster, extra):
        if c_helper.is_data_locality_enabled(cluster):
            topology_data = extra['topology_data']
            r.write_file_to('/etc/hadoop/topology.data', topology_data)

    def _push_master_configs(self, r, cluster, extra, instance):
        ng_extra = extra[instance.node_group.id]
        node_processes = instance.node_group.node_processes

        if 'namenode' in node_processes:
            self._push_namenode_configs(cluster, r)

        if 'jobtracker' in node_processes:
            self._push_jobtracker_configs(cluster, r)

        if 'oozie' in node_processes:
            self._push_oozie_configs(cluster, ng_extra, r)

        if 'hiveserver' in node_processes:
            self._push_hive_configs(cluster, ng_extra,
                                    extra['hive_mysql_passwd'], r)

    def _push_namenode_configs(self, cluster, r):
        r.write_file_to('/etc/hadoop/dn.incl',
                        utils.generate_fqdn_host_names(
                            vu.get_datanodes(cluster)))

    def _push_jobtracker_configs(self, cluster, r):
        r.write_file_to('/etc/hadoop/tt.incl',
                        utils.generate_fqdn_host_names(
                            vu.get_tasktrackers(cluster)))

    def _push_oozie_configs(self, cluster, ng_extra, r):
        r.write_file_to('/opt/oozie/conf/oozie-site.xml',
                        ng_extra['xml']['oozie-site'])

        if c_helper.is_mysql_enable(cluster):
            sql_script = f.get_file_text(
                'plugins/vanilla/v1_2_1/resources/create_oozie_db.sql')
            files = {
                '/tmp/create_oozie_db.sql': sql_script
            }
            r.write_files_to(files)

    def _push_hive_configs(self, cluster, ng_extra, hive_mysql_passwd, r):
        files = {
            '/opt/hive/conf/hive-site.xml':
            ng_extra['xml']['hive-site']
        }
        if c_helper.is_mysql_enable(cluster):
            sql_script = f.get_file_text(
                'plugins/vanilla/v1_2_1/resources/create_hive_db.sql'
            )
            sql_script = sql_script.replace('pass',
                                            hive_mysql_passwd)
            files.update({'/tmp/create_hive_db.sql': sql_script})
        r.write_files_to(files)

    def _set_cluster_info(self, cluster):
        nn = vu.get_namenode(cluster)
        jt = vu.get_jobtracker(cluster)
        oozie = vu.get_oozie(cluster)
        info = {}

        if jt:
            ui_port = c_helper.get_port_from_config(
                'MapReduce', 'mapred.job.tracker.http.address', cluster)
            jt_port = c_helper.get_port_from_config(
                'MapReduce', 'mapred.job.tracker', cluster)

            info['MapReduce'] = {
                'Web UI': 'http://%s:%s' % (jt.management_ip, ui_port),
                'JobTracker': '%s:%s' % (jt.hostname(), jt_port)
            }

        if nn:
            ui_port = c_helper.get_port_from_config('HDFS', 'dfs.http.address',
                                                    cluster)
            nn_port = c_helper.get_port_from_config('HDFS', 'fs.default.name',
                                                    cluster)

            info['HDFS'] = {
                'Web UI': 'http://%s:%s' % (nn.management_ip, ui_port),
                'NameNode': 'hdfs://%s:%s' % (nn.hostname(), nn_port)
            }

        if oozie:
            # TODO(yrunts) change from hardcode value
            info['JobFlow'] = {
                'Oozie': 'http://%s:11000' % oozie.management_ip
            }

        ctx = context.ctx()
        conductor.cluster_update(ctx, cluster, {'info': info})

    def _get_scalable_processes(self):
        return ["datanode", "tasktracker"]

    def _get_by_id(self, lst, id):
        for obj in lst:
            if obj.id == id:
                return obj

        return None

    def _validate_additional_ng_scaling(self, cluster, additional):
        jt = vu.get_jobtracker(cluster)
        scalable_processes = self._get_scalable_processes()

        for ng_id in additional:
            ng = self._get_by_id(cluster.node_groups, ng_id)
            if not set(ng.node_processes).issubset(scalable_processes):
                raise ex.NodeGroupCannotBeScaled(
                    ng.name, "Vanilla plugin cannot scale nodegroup"
                             " with processes: " +
                             ' '.join(ng.node_processes))
            if not jt and 'tasktracker' in ng.node_processes:
                raise ex.NodeGroupCannotBeScaled(
                    ng.name, "Vanilla plugin cannot scale node group with "
                             "processes which have no master-processes run "
                             "in cluster")

    def _validate_existing_ng_scaling(self, cluster, existing):
        scalable_processes = self._get_scalable_processes()
        dn_to_delete = 0
        for ng in cluster.node_groups:
            if ng.id in existing:
                if (ng.count > existing[ng.id] and "datanode" in
                        ng.node_processes):
                    dn_to_delete += ng.count - existing[ng.id]
                if not set(ng.node_processes).issubset(scalable_processes):
                    raise ex.NodeGroupCannotBeScaled(
                        ng.name, "Vanilla plugin cannot scale nodegroup"
                                 " with processes: " +
                                 ' '.join(ng.node_processes))

        dn_amount = len(vu.get_datanodes(cluster))
        rep_factor = c_helper.get_config_value('HDFS', 'dfs.replication',
                                               cluster)

        if dn_to_delete > 0 and dn_amount - dn_to_delete < rep_factor:
            raise ex.ClusterCannotBeScaled(
                cluster.name, "Vanilla plugin cannot shrink cluster because "
                              "it would be not enough nodes for replicas "
                              "(replication factor is %s)" % rep_factor)
