import os
import os.path as p
import sys

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from helpers.cluster import ClickHouseCluster
from helpers.network import PartitionManager
from helpers.test_tools import TSV


class ClickHouseClusterWithDDLHelpers(ClickHouseCluster):
    def __init__(self, base_path, config_dir):
        ClickHouseCluster.__init__(self, base_path)

        self.test_config_dir = config_dir

    def prepare(self, replace_hostnames_with_ips=True):
        try:
            for i in xrange(4):
                self.add_instance(
                    'ch{}'.format(i+1),
                    config_dir=self.test_config_dir,
                    macros={"layer": 0, "shard": i/2 + 1, "replica": i%2 + 1},
                    with_zookeeper=True)

            self.start()

            # Replace config files for testing ability to set host in DNS and IP formats
            if replace_hostnames_with_ips:
                self.replace_domains_to_ip_addresses_in_cluster_config(['ch1', 'ch3'])

            # Select sacrifice instance to test CONNECTION_LOSS and server fail on it
            sacrifice = self.instances['ch4']
            self.pm_random_drops = PartitionManager()
            self.pm_random_drops._add_rule({'probability': 0.01, 'destination': sacrifice.ip_address, 'source_port': 2181, 'action': 'REJECT --reject-with tcp-reset'})
            self.pm_random_drops._add_rule({'probability': 0.01, 'source': sacrifice.ip_address, 'destination_port': 2181, 'action': 'REJECT --reject-with tcp-reset'})

            # Initialize databases and service tables
            instance = self.instances['ch1']

            self.ddl_check_query(instance, """
        CREATE TABLE IF NOT EXISTS all_tables ON CLUSTER 'cluster_no_replicas'
            (database String, name String, engine String, metadata_modification_time DateTime)
            ENGINE = Distributed('cluster_no_replicas', 'system', 'tables')
                """)

            self.ddl_check_query(instance, "CREATE DATABASE IF NOT EXISTS test ON CLUSTER 'cluster'")

        except Exception as e:
            print e
            raise

    def sync_replicas(self, table, timeout=5):
        for instance in self.instances.values():
            instance.query("SYSTEM SYNC REPLICA {}".format(table), timeout=timeout)

    def check_all_hosts_successfully_executed(self, tsv_content, num_hosts=None):
        if num_hosts is None:
            num_hosts = len(self.instances)

        M = TSV.toMat(tsv_content)
        hosts = [(l[0], l[1]) for l in M] # (host, port)
        codes = [l[2] for l in M]
        messages = [l[3] for l in M]

        assert len(hosts) == num_hosts and len(set(hosts)) == num_hosts, "\n" + tsv_content
        assert len(set(codes)) == 1, "\n" + tsv_content
        assert codes[0] == "0", "\n" + tsv_content

    def ddl_check_query(self, instance, query, num_hosts=None):
        contents = instance.query(query)
        self.check_all_hosts_successfully_executed(contents, num_hosts)
        return contents

    def replace_domains_to_ip_addresses_in_cluster_config(self, instances_to_replace):
        clusters_config = open(p.join(self.base_dir, '{}/config.d/clusters.xml'.format(self.test_config_dir))).read()

        for inst_name, inst in self.instances.items():
            clusters_config = clusters_config.replace(inst_name, str(inst.ip_address))

        for inst_name in instances_to_replace:
            inst = self.instances[inst_name]
            self.instances[inst_name].exec_in_container(['bash', '-c', 'echo "$NEW_CONFIG" > /etc/clickhouse-server/config.d/clusters.xml'], environment={"NEW_CONFIG": clusters_config}, privileged=True)
            # print cluster.instances[inst_name].exec_in_container(['cat', "/etc/clickhouse-server/config.d/clusters.xml"])

    @staticmethod
    def ddl_check_there_are_no_dublicates(instance):
        query = "SELECT max(c), argMax(q, c) FROM (SELECT lower(query) AS q, count() AS c FROM system.query_log WHERE type=2 AND q LIKE '/* ddl_entry=query-%' GROUP BY query)"
        rows = instance.query(query)
        assert len(rows) > 0 and rows[0][0] == "1", "dublicates on {} {}, query {}".format(instance.name, instance.ip_address, query)

    @staticmethod
    def insert_reliable(instance, query_insert):
        """
        Make retries in case of UNKNOWN_STATUS_OF_INSERT or zkutil::KeeperException errors
        """

        for i in xrange(100):
            try:
                instance.query(query_insert)
                return
            except Exception as e:
                last_exception = e
                s = str(e)
                if not (s.find('Unknown status, client must retry') >= 0 or s.find('zkutil::KeeperException')):
                    raise e

        raise last_exception