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# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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,
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import json
import os

import time
from ducktape.cluster.remoteaccount import RemoteCommandError
from ducktape.services.background_thread import BackgroundThreadService
from kafkatest.directory_layout.kafka_path import KafkaPathResolverMixin
from kafkatest.services.kafka import TopicPartition
from kafkatest.services.verifiable_client import VerifiableClientMixin
from kafkatest.utils import is_int, is_int_with_prefix
from kafkatest.version import get_version, V_2_5_0, DEV_BRANCH
from kafkatest.services.kafka.util import fix_opts_for_new_jvm, get_log4j_config_param, get_log4j_config_for_tools


class VerifiableProducer(KafkaPathResolverMixin, VerifiableClientMixin, BackgroundThreadService):
    """This service wraps org.apache.kafka.tools.VerifiableProducer for use in
    system testing.

    NOTE: this class should be treated as a PUBLIC API. Downstream users use
    this service both directly and through class extension, so care must be
    taken to ensure compatibility.
    """

    PERSISTENT_ROOT = "/mnt/verifiable_producer"
    STDOUT_CAPTURE = os.path.join(PERSISTENT_ROOT, "verifiable_producer.stdout")
    STDERR_CAPTURE = os.path.join(PERSISTENT_ROOT, "verifiable_producer.stderr")
    LOG_DIR = os.path.join(PERSISTENT_ROOT, "logs")
    LOG_FILE = os.path.join(LOG_DIR, "verifiable_producer.log")
    CONFIG_FILE = os.path.join(PERSISTENT_ROOT, "verifiable_producer.properties")

    logs = {
        "verifiable_producer_stdout": {
            "path": STDOUT_CAPTURE,
            "collect_default": False},
        "verifiable_producer_stderr": {
            "path": STDERR_CAPTURE,
            "collect_default": False},
        "verifiable_producer_log": {
            "path": LOG_FILE,
            "collect_default": True}
        }

    def __init__(self, context, num_nodes, kafka, topic, max_messages=-1, throughput=100000,
                 message_validator=is_int, compression_types=None, version=DEV_BRANCH, acks=None,
                 stop_timeout_sec=150, request_timeout_sec=30, log_level="INFO",
                 enable_idempotence=False, offline_nodes=[], create_time=-1, repeating_keys=None,
                 jaas_override_variables=None, kafka_opts_override="", client_prop_file_override="",
                 retries=None):
        """
        Args:
            :param max_messages                number of messages to be produced per producer
            :param message_validator           checks for an expected format of messages produced. There are
                                               currently two:
                                               * is_int is an integer format; this is default and expected to be used if
                                                 num_nodes = 1
                                               * is_int_with_prefix recommended if num_nodes > 1, because otherwise each producer
                                                 will produce exactly same messages, and validation may miss missing messages.
            :param compression_types           If None, all producers will not use compression; or a list of compression types,
                                               one per producer (could be "none").
            :param jaas_override_variables     A dict of variables to be used in the jaas.conf template file
            :param kafka_opts_override         Override parameters of the KAFKA_OPTS environment variable
            :param client_prop_file_override   Override client.properties file used by the consumer
        """
        super(VerifiableProducer, self).__init__(context, num_nodes)
        self.log_level = log_level

        self.kafka = kafka
        self.topic = topic
        self.max_messages = max_messages
        self.throughput = throughput
        self.message_validator = message_validator
        self.compression_types = compression_types
        if self.compression_types is not None:
            assert len(self.compression_types) == num_nodes, "Specify one compression type per node"

        for node in self.nodes:
            node.version = version
        self.acked_values = []
        self.acked_values_by_partition = {}
        self._last_acked_offsets = {}
        self.not_acked_values = []
        self.produced_count = {}
        self.clean_shutdown_nodes = set()
        self.acks = acks
        self.stop_timeout_sec = stop_timeout_sec
        self.request_timeout_sec = request_timeout_sec
        self.enable_idempotence = enable_idempotence
        self.offline_nodes = offline_nodes
        self.create_time = create_time
        self.repeating_keys = repeating_keys
        self.jaas_override_variables = jaas_override_variables or {}
        self.kafka_opts_override = kafka_opts_override
        self.client_prop_file_override = client_prop_file_override
        self.retries = retries

    def java_class_name(self):
        return "VerifiableProducer"

    def prop_file(self, node):
        idx = self.idx(node)
        prop_file = self.render('producer.properties', request_timeout_ms=(self.request_timeout_sec * 1000))
        prop_file += "\n{}".format(str(self.security_config))
        if self.compression_types is not None:
            compression_index = idx - 1
            self.logger.info("VerifiableProducer (index = %d) will use compression type = %s", idx,
                             self.compression_types[compression_index])
            prop_file += "\ncompression.type=%s\n" % self.compression_types[compression_index]
        return prop_file

    def _worker(self, idx, node):
        node.account.ssh("mkdir -p %s" % VerifiableProducer.PERSISTENT_ROOT, allow_fail=False)

        # Create and upload log properties
        log_config = self.render(get_log4j_config_for_tools(node), log_file=VerifiableProducer.LOG_FILE)
        node.account.create_file(get_log4j_config_for_tools(node), log_config)

        # Configure security
        self.security_config = self.kafka.security_config.client_config(node=node,
                                                                        jaas_override_variables=self.jaas_override_variables)
        self.security_config.setup_node(node)

        # Create and upload config file
        if self.client_prop_file_override:
            producer_prop_file = self.client_prop_file_override
        else:
            producer_prop_file = self.prop_file(node)

        if self.acks is not None:
            self.logger.info("VerifiableProducer (index = %d) will use acks = %s", idx, self.acks)
            producer_prop_file += "\nacks=%s\n" % self.acks

        if self.enable_idempotence and self.retries is not None:
            assert self.retries > 0, "Retries must be greater than 0 when used with idempotence"
            self.logger.info("VerifiableProducer (index = %d) will use idempotence and retries = %s", idx, self.retries)
            producer_prop_file += "\nmax.in.flight.requests.per.connection=5\n"
            producer_prop_file += "\nenable.idempotence=true\n"
            producer_prop_file += "\nretries=%s\n" % self.retries
            producer_prop_file += "\ndelivery.timeout.ms=%s\n" % (self.request_timeout_sec * 1000 * self.retries)
        elif self.enable_idempotence:
            self.logger.info("Setting up an idempotent producer")
            producer_prop_file += "\nmax.in.flight.requests.per.connection=5\n"
            producer_prop_file += "\nretries=1000000\n"
            producer_prop_file += "\nenable.idempotence=true\n"
        elif self.retries is not None:
            self.logger.info("VerifiableProducer (index = %d) will use retries = %s", idx, self.retries)
            producer_prop_file += "\nretries=%s\n" % self.retries
            producer_prop_file += "\ndelivery.timeout.ms=%s\n" % (self.request_timeout_sec * 1000 * self.retries)

        self.logger.info("verifiable_producer.properties:")
        self.logger.info(producer_prop_file)
        node.account.create_file(VerifiableProducer.CONFIG_FILE, producer_prop_file)

        cmd = self.start_cmd(node, idx)
        self.logger.debug("VerifiableProducer %d command: %s" % (idx, cmd))

        self.produced_count[idx] = 0
        last_produced_time = time.time()
        prev_msg = None

        for line in node.account.ssh_capture(cmd):
            line = line.strip()

            data = self.try_parse_json(line)
            if data is not None:

                with self.lock:
                    if data["name"] == "producer_send_error":
                        data["node"] = idx
                        self.not_acked_values.append(self.message_validator(data["value"]))
                        self.produced_count[idx] += 1

                    elif data["name"] == "producer_send_success":
                        partition = TopicPartition(data["topic"], data["partition"])
                        value = self.message_validator(data["value"])
                        self.acked_values.append(value)

                        if partition not in self.acked_values_by_partition:
                            self.acked_values_by_partition[partition] = []
                        self.acked_values_by_partition[partition].append(value)

                        self._last_acked_offsets[partition] = data["offset"]
                        self.produced_count[idx] += 1

                        # Log information if there is a large gap between successively acknowledged messages
                        t = time.time()
                        time_delta_sec = t - last_produced_time
                        if time_delta_sec > 2 and prev_msg is not None:
                            self.logger.debug(
                                "Time delta between successively acked messages is large: " +
                                "delta_t_sec: %s, prev_message: %s, current_message: %s" % (str(time_delta_sec), str(prev_msg), str(data)))

                        last_produced_time = t
                        prev_msg = data

                    elif data["name"] == "shutdown_complete":
                        if node in self.clean_shutdown_nodes:
                            raise Exception("Unexpected shutdown event from producer, already shutdown. Producer index: %d" % idx)
                        self.clean_shutdown_nodes.add(node)

    def _has_output(self, node):
        """Helper used as a proxy to determine whether jmx is running by that jmx_tool_log contains output."""
        try:
            node.account.ssh("test -z \"$(cat %s)\"" % VerifiableProducer.STDOUT_CAPTURE, allow_fail=False)
            return False
        except RemoteCommandError:
            return True

    def start_cmd(self, node, idx):
        cmd  = "export LOG_DIR=%s;" % VerifiableProducer.LOG_DIR
        if self.kafka_opts_override:
            cmd += " export KAFKA_OPTS=\"%s\";" % self.kafka_opts_override
        else:
            cmd += " export KAFKA_OPTS=%s;" % self.security_config.kafka_opts

        cmd += fix_opts_for_new_jvm(node)
        cmd += " export KAFKA_LOG4J_OPTS=\"%s%s\"; " % (get_log4j_config_param(node), get_log4j_config_for_tools(node))
        cmd += self.impl.exec_cmd(node)
        version = get_version(node)
        if version >= V_2_5_0:
            server_option_flag = "--bootstrap-server"
        else:
            server_option_flag = "--broker-list"
        cmd += " --topic %s %s %s" % (self.topic, server_option_flag, self.kafka.bootstrap_servers(self.security_config.security_protocol, True, self.offline_nodes))
        if self.max_messages > 0:
            cmd += " --max-messages %s" % str(self.max_messages)
        if self.throughput > 0:
            cmd += " --throughput %s" % str(self.throughput)
        if self.message_validator == is_int_with_prefix:
            cmd += " --value-prefix %s" % str(idx)
        if self.acks is not None:
            cmd += " --acks %s " % str(self.acks)
        if self.create_time > -1:
            cmd += " --message-create-time %s " % str(self.create_time)
        if self.repeating_keys is not None:
            cmd += " --repeating-keys %s " % str(self.repeating_keys)

        cmd += " --producer.config %s" % VerifiableProducer.CONFIG_FILE

        cmd += " 2>> %s | tee -a %s &" % (VerifiableProducer.STDOUT_CAPTURE, VerifiableProducer.STDOUT_CAPTURE)
        return cmd

    def kill_node(self, node, clean_shutdown=True, allow_fail=False):
        sig = self.impl.kill_signal(clean_shutdown)
        for pid in self.pids(node):
            node.account.signal(pid, sig, allow_fail)

    def pids(self, node):
        return self.impl.pids(node)

    def alive(self, node):
        return len(self.pids(node)) > 0

    @property
    def last_acked_offsets(self):
        with self.lock:
            return self._last_acked_offsets

    @property
    def acked(self):
        with self.lock:
            return self.acked_values

    @property
    def acked_by_partition(self):
        with self.lock:
            return self.acked_values_by_partition

    @property
    def not_acked(self):
        with self.lock:
            return self.not_acked_values

    @property
    def num_acked(self):
        with self.lock:
            return len(self.acked_values)

    @property
    def num_not_acked(self):
        with self.lock:
            return len(self.not_acked_values)

    def each_produced_at_least(self, count):
        with self.lock:
            for idx in range(1, self.num_nodes + 1):
                if self.produced_count.get(idx) is None or self.produced_count[idx] < count:
                    return False
            return True

    def stop_node(self, node):
        # There is a race condition on shutdown if using `max_messages` since the
        # VerifiableProducer will shutdown automatically when all messages have been
        # written. In this case, the process will be gone and the signal will fail.
        allow_fail = self.max_messages > 0
        self.kill_node(node, clean_shutdown=True, allow_fail=allow_fail)

        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):
        self.kill_node(node, clean_shutdown=False, allow_fail=False)
        node.account.ssh("rm -rf " + self.PERSISTENT_ROOT, allow_fail=False)
        self.security_config.clean_node(node)

    def try_parse_json(self, string):
        """Try to parse a string as json. Return None if not parseable."""
        try:
            record = json.loads(string)
            return record
        except ValueError:
            self.logger.debug("Could not parse as json: %s" % str(string))
            return None
