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from ducktape.services.background_thread import BackgroundThreadService

from kafkatest.directory_layout.kafka_path import KafkaPathResolverMixin
from kafkatest.services.security.security_config import SecurityConfig

import re


class ReplicaVerificationTool(KafkaPathResolverMixin, BackgroundThreadService):

    logs = {
        "producer_log": {
            "path": "/mnt/replica_verification_tool.log",
            "collect_default": False}
    }

    def __init__(self, context, num_nodes, kafka, topic, report_interval_ms, security_protocol="PLAINTEXT",
                 stop_timeout_sec=30, tls_version=None):
        super(ReplicaVerificationTool, self).__init__(context, num_nodes)

        self.kafka = kafka
        self.topic = topic
        self.report_interval_ms = report_interval_ms
        self.security_protocol = security_protocol
        self.tls_version = tls_version
        self.security_config = SecurityConfig(self.context, security_protocol, tls_version=tls_version)
        self.partition_lag = {}
        self.stop_timeout_sec = stop_timeout_sec

    def _worker(self, idx, node):
        cmd = self.start_cmd(node)
        self.logger.debug("ReplicaVerificationTool %d command: %s" % (idx, cmd))
        self.security_config.setup_node(node)
        for line in node.account.ssh_capture(cmd):
            self.logger.debug("Parsing line:{}".format(line))

            parsed = re.search('.*max lag is (.+?) for partition ([a-zA-Z0-9._-]+-[0-9]+) at', line)
            if parsed:
                lag = int(parsed.group(1))
                topic_partition = parsed.group(2)
                self.logger.debug("Setting max lag for {} as {}".format(topic_partition, lag))
                self.partition_lag[topic_partition] = lag

    def get_lag_for_partition(self, topic, partition):
        """
        Get latest lag for given topic-partition

        Args:
            topic:          a topic
            partition:      a partition of the topic
        """
        topic_partition = topic + '-' + str(partition)
        lag = self.partition_lag.get(topic_partition, -1)
        self.logger.debug("Returning lag for {} as {}".format(topic_partition, lag))

        return lag

    def start_cmd(self, node):
        cmd = self.path.script("kafka-replica-verification.sh", node)
        cmd += " --broker-list %s --topics-include %s --time -2 --report-interval-ms %s" % (self.kafka.bootstrap_servers(self.security_protocol), self.topic, self.report_interval_ms)

        cmd += " 2>> /mnt/replica_verification_tool.log | tee -a /mnt/replica_verification_tool.log &"
        return cmd

    def stop_node(self, node):
        node.account.kill_java_processes("ReplicaVerificationTool", clean_shutdown=True,
                                         allow_fail=True)

        stopped = self.wait_node(node, timeout_sec=self.stop_timeout_sec)
        assert stopped, "Node %s: did not stop within the specified timeout of %s seconds" % \
                        (str(node.account), str(self.stop_timeout_sec))

    def clean_node(self, node):
        node.account.kill_java_processes("ReplicaVerificationTool", clean_shutdown=False,
                                         allow_fail=True)
        node.account.ssh("rm -rf /mnt/replica_verification_tool.log", allow_fail=False)
