# -*- coding: utf-8 -*- #
# Copyright 2024 Google LLC. All Rights Reserved.
#
# 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.
"""A library used to support Managed Service for Apache Kafka commands."""

import re

from apitools.base.py import encoding
from apitools.base.py import exceptions as apitools_exceptions
from googlecloudsdk import core
from googlecloudsdk.api_lib.util import apis
from googlecloudsdk.calliope import exceptions
from googlecloudsdk.core import log
from googlecloudsdk.core import properties

# Retrieve all message type for conversions from gcloud primitives to
# apitool types.
_MESSAGE = apis.GetMessagesModule("managedkafka", "v1")
SASL_PORT = "9092"
MTLS_PORT = "9192"
CONTEXTS_RESOURCE_PATH = "/contexts/"
SUBJECTS_RESOURCE_PATH = "/subjects/"
SUBJECTS_MODE_RESOURCE_PATH = "/mode/"
SUBJECTS_CONFIG_RESOURCE_PATH = "/config/"


def ValidateCPU(cpu):
  """Validate CPU >= 3."""
  if cpu < 3:
    raise exceptions.BadArgumentException("--cpu", "CPU must be at least 3")
  return cpu


def PrepareUpdateWithSubnets(_, args, request):
  """Prepare the update request with the information from the subnet flag.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
    The updated request with the subnet.
  """
  if not args.subnets:
    return request

  # The cluster is not created yet if only the subnet flag is set. This is
  # because we don't formally map the subnet to the request the same way we do
  # for other flags. Instead, subnets require special handling with the use of
  # hooks.
  if not request.cluster:
    request.cluster = {}

  subnet_update_mask = "gcpConfig.accessConfig.networkConfigs"
  request.updateMask = AppendUpdateMask(request.updateMask, subnet_update_mask)
  return MapSubnetsToNetworkConfig(_, args, request)


def PrepareUpdateWithCaPools(_, args, request):
  """Prepare the update request with the information from the mTLS CA pool flag.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
    The updated request with the CA pool.
  """

  # If the user is clearing the CA pools, we need to add the update mask.
  # This flag is guarded by a mutex and will not conflict with the ca pool flag.
  if args.clear_mtls_ca_pools:
    request.updateMask = AppendUpdateMask(
        request.updateMask, "tlsConfig.trustConfig.casConfigs"
    )
    return request

  # If the there are no CA pools to update, return the request as is.
  if not args.mtls_ca_pools:
    return request

  # The cluster is not created yet if only the CA pool flag is set. This is
  # because we don't formally map the CA pool to the request the same way we do
  # for other flags. Instead, CA pools require special handling with the use of
  # hooks.
  if not request.cluster:
    request.cluster = {}

  ca_pool_update_mask = "tlsConfig.trustConfig.casConfigs"
  request.updateMask = AppendUpdateMask(request.updateMask, ca_pool_update_mask)
  return MapCaPoolsToCASConfig(_, args, request)


def AppendUpdateMask(update_mask, new_mask):
  """Handles appending a new mask to an existing mask.

  Args:
    update_mask: the existing update mask.
    new_mask: the new mask to append.

  Returns:
    The fully appended update mask.
  """
  update_mask = f"{update_mask},{new_mask}"
  return update_mask if update_mask[0] != "," else update_mask[1:]


def MapSubnetsToNetworkConfig(_, args, request):
  """Maps the list of subnets from the flag to the API fields in the request.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
    The updated request with networkConfig in the JSON format.
  """
  # Reference the existing GCP config if already created for the request.
  if not request.cluster.gcpConfig:
    request.cluster.gcpConfig = {}
  request.cluster.gcpConfig.accessConfig = {"networkConfigs": []}
  for subnet in args.subnets:
    network_config = {"subnet": subnet}
    request.cluster.gcpConfig.accessConfig.networkConfigs.append(
        encoding.DictToMessage(network_config, _MESSAGE.NetworkConfig)
    )
  return request


def MapCaPoolsToCASConfig(_, args, request):
  """Maps the list of CA pools from the flag to the API fields in the request.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
    The updated request with CertificateAuthorityServiceConfig in the JSON
    format.
  """
  if not args.mtls_ca_pools:
    return request

  # Reference the existing CAS config if already created for the request.
  if not request.cluster.tlsConfig:
    request.cluster.tlsConfig = {}
  request.cluster.tlsConfig.trustConfig = {"casConfigs": []}
  for ca_pool in args.mtls_ca_pools:
    cas_config = {"caPool": ca_pool}
    request.cluster.tlsConfig.trustConfig.casConfigs.append(
        encoding.DictToMessage(
            cas_config, _MESSAGE.CertificateAuthorityServiceConfig
        )
    )
  return request


def ListWithBootstrapAddr(response, _):
  """Synthesizes the bootstrap address to the response for a list request.

  Args:
    response: the payload to return.
    _: list of flags.

  Returns:
    The updated clusters with the bootstrap.
  """
  return [
      SynthesizeBootstrapAddr(cluster, cluster.name) for cluster in response
  ]


def DescribeWithBootstrapAddr(response, _):
  """Synthesizes the bootstrap address to the response for a describe request.

  Args:
    response: the payload to return.
    _: list of flags.

  Returns:
    The updated cluster with the bootstrap.
  """
  return SynthesizeBootstrapAddr(response, response.name)


def SynthesizeBootstrapAddr(response, cluster):
  """Synthesizes the bootstrap address to the response.

  Args:
    response: the payload to update.
    cluster: the fully qualifed name of the cluster.

  Returns:
    The updated cluster with the bootstrap
  """
  # The fully qualified name will always be consistent. We also have to use the
  # fully qualifed name instead of the resource directly to support both
  # `describe` and `list`.
  name = cluster.split("/")[5]
  location = cluster.split("/")[3]
  project = core.properties.VALUES.core.project.Get()
  domain_prefixed_project = project.split(":")
  if len(domain_prefixed_project) == 2:
    project = f"{domain_prefixed_project[1]}.{domain_prefixed_project[0]}"
  bootstrap = f"bootstrap.{name}.{location}.managedkafka.{project}.cloud.goog"
  synthesized = core.resource.resource_projector.MakeSerializable(response)
  synthesized["bootstrapAddress"] = f"{bootstrap}:{SASL_PORT}"
  if hasattr(response, "tlsConfig") and response.tlsConfig:
    synthesized["bootstrapAddressMTLS"] = f"{bootstrap}:{MTLS_PORT}"
  return synthesized


def UpdateTopics(_, args, request):
  """Load the topics JSON from the argument to the request.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
    The updated request with topics.
  """
  topics = core.yaml.load(args.topics_file)
  request.consumerGroup = {
      "topics": encoding.DictToMessage(
          topics, _MESSAGE.ConsumerGroup.TopicsValue
      )
  }
  request.updateMask = "topics"
  return request


def MapConnectParamsToNetworkConfig(_, args, request):
  """Maps subnets and DNS names to the network config API field.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
    The updated request with networkConfig in the JSON format.
  """
  # If no network config flags are provided (such as in the case of an update),
  # we don't need to create a network config.
  if not args.primary_subnet and not args.dns_name:
    return request
  # Reference the existing GCP config if already created for the request.
  if not request.connectCluster.gcpConfig:
    request.connectCluster.gcpConfig = {}
  request.connectCluster.gcpConfig.accessConfig = {"networkConfigs": []}
  # Subnets may not be provided during update
  if not args.primary_subnet:
    network_config = {"dns_domain_names": []}
  else:
    network_config = {
        "primary_subnet": args.primary_subnet,
        "additional_subnets": [],
        "dns_domain_names": [],
    }
  if not args.additional_subnet:
    args.additional_subnet = []
  network_config["additional_subnets"] = list(args.additional_subnet)
  if not args.dns_name:
    args.dns_name = []
  network_config["dns_domain_names"] = list(args.dns_name)
  request.connectCluster.gcpConfig.accessConfig.networkConfigs.append(
      encoding.DictToMessage(network_config, _MESSAGE.ConnectNetworkConfig)
  )
  if isinstance(
      # (if the request is an update)
      request,
      _MESSAGE.ManagedkafkaProjectsLocationsConnectClustersPatchRequest,
  ):
    request.updateMask = re.sub(
        r"gcpConfig\.accessConfig\.networkConfigs\.dnsDomainNames",
        "gcpConfig.accessConfig.networkConfigs",
        request.updateMask,
    )
    request.updateMask = re.sub(
        r"gcpConfig\.accessConfig\.networkConfigs\.primarySubnet",
        "gcpConfig.accessConfig.networkConfigs",
        request.updateMask,
    )
    request.updateMask = re.sub(
        r"gcpConfig\.accessConfig\.networkConfigs\.additionalSubnets",
        "gcpConfig.accessConfig.networkConfigs",
        request.updateMask,
    )
  return request


def PrepareConnectClusterCreate(_, args, request):
  """Load the config JSON from the argument to the request and build the kafka cluster resource path.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
  """
  if args.config_file:
    config = core.yaml.load(args.config_file)
    request.connectCluster.config = encoding.DictToMessage(
        config, _MESSAGE.ConnectCluster.ConfigValue
    )
  project = args.project or core.properties.VALUES.core.project.Get()
  # If the user provides the full path, we don't need to build it.
  kafka_cluster_path = args.kafka_cluster
  if not re.match(r"projects/.+/locations/.+/clusters/.+", args.kafka_cluster):
    location = args.location or args.connect_cluster.split("/")[3]
    kafka_cluster_path = (
        f"projects/{project}/locations/{location}/clusters/{args.kafka_cluster}"
    )
  request.connectCluster.kafkaCluster = kafka_cluster_path
  return request


def PrepareConnectClusterUpdate(_, args, request):
  """Map the update flags to the request and update mask.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
  """
  if args.config_file:
    config = core.yaml.load(args.config_file)
    request.connectCluster.config = encoding.DictToMessage(
        config, _MESSAGE.ConnectCluster.ConfigValue
    )
    request.updateMask = AppendUpdateMask(request.updateMask, "config")
  if args.clear_configs:
    request.updateMask = AppendUpdateMask(request.updateMask, "config")
  if args.clear_dns_names:
    request.updateMask = AppendUpdateMask(
        request.updateMask,
        "gcpConfig.accessConfig.networkConfigs.dnsDomainNames",
    )
  if args.clear_secrets:
    request.updateMask = AppendUpdateMask(
        request.updateMask, "gcpConfig.secretPaths"
    )
  if args.clear_labels:
    request.updateMask = AppendUpdateMask(request.updateMask, "labels")
  return request


def ConnectorCreateReadConfigAndTaskRestartPolicy(_, args, request):
  """Load the config JSON from the argument to the request.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
  """
  if not request.connector:
    request.connector = {}
  if args.config_file:
    config = core.yaml.load(args.config_file)
    request.connector.configs = encoding.DictToMessage(
        config, _MESSAGE.Connector.ConfigsValue
    )
  # Gcloud's duration formatting doesn't seem to play nice with the protobuf
  # duration parsing, so we convert to seconds and append the unit suffix here.
  task_restart_policy_dict = {}
  if args.task_restart_max_backoff:
    task_restart_policy_dict["maximum_backoff"] = (
        str(args.task_restart_max_backoff.total_seconds) + "s"
    )
  if args.task_restart_min_backoff:
    task_restart_policy_dict["minimum_backoff"] = (
        str(args.task_restart_min_backoff.total_seconds) + "s"
    )
  if task_restart_policy_dict:
    request.connector.taskRestartPolicy = encoding.DictToMessage(
        task_restart_policy_dict,
        _MESSAGE.TaskRetryPolicy,
    )
  return request


def ConnectorUpdateReadConfigAndTaskRestartPolicy(_, args, request):
  """Load the config JSON from the argument to the request, and parse out the task restart policy.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
  """
  if not request.connector:
    request.connector = {}
  if args.config_file:
    config = core.yaml.load(args.config_file)
    request.connector.configs = encoding.DictToMessage(
        config, _MESSAGE.Connector.ConfigsValue
    )
    request.updateMask = AppendUpdateMask(request.updateMask, "configs")
  # Gcloud's duration formatting doesn't seem to play nice with the protobuf
  # duration parsing, so we convert to seconds and append the unit suffix here.
  task_restart_policy_dict = {}
  if args.task_restart_max_backoff:
    task_restart_policy_dict["maximum_backoff"] = (
        str(args.task_restart_max_backoff.total_seconds) + "s"
    )
  if args.task_restart_min_backoff:
    task_restart_policy_dict["minimum_backoff"] = (
        str(args.task_restart_min_backoff.total_seconds) + "s"
    )
  if task_restart_policy_dict:
    request.connector.taskRestartPolicy = encoding.DictToMessage(
        task_restart_policy_dict,
        _MESSAGE.TaskRetryPolicy,
    )
  return request


def PatchConfigs(_, args, request):
  """Unnest the configs dictionary to the update mask.

  Args:
    _:  resource parameter required but unused variable.
    args: list of flags.
    request:  the payload to return.

  Returns:
    The new update mask with the configs.
  """
  if args.configs:
    update_mask = request.updateMask.split(",")
    update_mask.remove("configs")
    configs_list = []
    for key, _ in args.configs.items():
      configs_list.append(f'configs["{key}"]')
    request.updateMask = AppendUpdateMask(
        ",".join(update_mask), ",".join(configs_list)
    )
  # This flag is guarded with a mutex so it won't conflict with the above.
  if args.clear_configs:
    request.updateMask = AppendUpdateMask(request.updateMask, "configs")
  return request


def ParseMode(mode) -> str:
  """Parse the mode enum to a string.

  Args:
    mode: The mode enum of the schema registry or subject.

  Returns:
    The mode string.
  """

  if mode == _MESSAGE.SchemaMode.ModeValueValuesEnum.READWRITE:
    return "READWRITE"
  elif mode == _MESSAGE.SchemaMode.ModeValueValuesEnum.READONLY:
    return "READONLY"
  elif mode == _MESSAGE.SchemaMode.ModeValueValuesEnum.IMPORT:
    return "IMPORT"
  else:
    return "NONE"


def ParseCompatibility(compatibility) -> str:
  """Parse the compatibility enum to a string.

  Args:
    compatibility: The compatibility enum of the schema registry or subject.

  Returns:
    The compatibility string.
  """
  if (
      compatibility
      == _MESSAGE.SchemaConfig.CompatibilityValueValuesEnum.BACKWARD
  ):
    return "BACKWARD"
  elif (
      compatibility
      == _MESSAGE.SchemaConfig.CompatibilityValueValuesEnum.BACKWARD_TRANSITIVE
  ):
    return "BACKWARD_TRANSITIVE"
  elif (
      compatibility
      == _MESSAGE.SchemaConfig.CompatibilityValueValuesEnum.FORWARD
  ):
    return "FORWARD"
  elif (
      compatibility
      == _MESSAGE.SchemaConfig.CompatibilityValueValuesEnum.FORWARD_TRANSITIVE
  ):
    return "FORWARD_TRANSITIVE"
  elif compatibility == _MESSAGE.SchemaConfig.CompatibilityValueValuesEnum.FULL:
    return "FULL"
  elif (
      compatibility
      == _MESSAGE.SchemaConfig.CompatibilityValueValuesEnum.FULL_TRANSITIVE
  ):
    return "FULL_TRANSITIVE"
  else:
    return "NONE"


def ParseProject(project_id=None):
  return project_id or properties.VALUES.core.project.Get(required=True)


def DeleteSubjectMode(subject, subject_run_resource, context):
  """Called when the user runs gcloud managed-kafka schema-registries subject delete ...

  Args:
    subject: The subject of the attribute to delete.
    subject_run_resource: The subject resource path.
    context: The context of the schema registry if provided.

  Returns:
    The updated subject with its mode deleted.
  """

  message = apis.GetMessagesModule("managedkafka", "v1")
  client = apis.GetClientInstance("managedkafka", "v1")

  schema_registry_resource = subject_run_resource

  schema_registry_resource = (
      f"{schema_registry_resource}{SUBJECTS_MODE_RESOURCE_PATH}{subject}"
  )

  # Check if context is provided.
  if context:
    log.status.Print("Deleting subject mode for [%s]." % subject)
    request = message.ManagedkafkaProjectsLocationsSchemaRegistriesContextsModeDeleteRequest(
        name=schema_registry_resource
    )
    try:
      client.projects_locations_schemaRegistries_contexts_mode.Delete(
          request=request
      )
      log.UpdatedResource(subject, details="mode. It is now unset.")
    except apitools_exceptions.HttpNotFoundError as e:
      api_error = exceptions.HttpException(e, HTTP_ERROR_FORMAT)
      log.status.Print(api_error.message)
      if "Resource not found" in api_error.message:
        raise exceptions.HttpException(
            e, error_format="Subject {} not found.".format(subject)
        )
  else:
    log.status.Print("Deleting subject mode for [%s]." % subject)
    request = (
        message.ManagedkafkaProjectsLocationsSchemaRegistriesModeDeleteRequest(
            name=schema_registry_resource
        )
    )
    try:
      client.projects_locations_schemaRegistries_mode.Delete(request=request)
      log.UpdatedResource(subject, details="mode. It is now unset.")
    except apitools_exceptions.HttpNotFoundError as e:
      api_error = exceptions.HttpException(e, HTTP_ERROR_FORMAT)
      log.status.Print(api_error.message)
      if "Resource not found" in api_error.message:
        raise exceptions.HttpException(
            e, error_format="Subject {} not found.".format(subject)
        )


def DeleteSubjectConfig(subject, schema_registry_resource, context):
  """Called when the user runs gcloud managed-kafka schema-registries subject delete ...

  Args:
    subject: The subject of the attribute to delete.
    schema_registry_resource: The schema registry resource path.
    context: The context of the schema registry if provided.

  Returns:
    The updated subject with its config deleted.
  """
  message = apis.GetMessagesModule("managedkafka", "v1")
  client = apis.GetClientInstance("managedkafka", "v1")
  name = f"{schema_registry_resource}{SUBJECTS_CONFIG_RESOURCE_PATH}{subject}"
  # Check if context is provided.
  if context:
    log.status.Print("Deleting subject config for [%s]." % subject)
    request = message.ManagedkafkaProjectsLocationsSchemaRegistriesContextsConfigDeleteRequest(
        name=name
    )
    try:
      client.projects_locations_schemaRegistries_contexts_config.Delete(
          request=request
      )
      log.UpdatedResource(subject, details="config. It is now unset.")
    except apitools_exceptions.HttpNotFoundError as e:
      api_error = exceptions.HttpException(e, HTTP_ERROR_FORMAT)
      log.status.Print(api_error.message)
      if "Resource not found" in api_error.message:
        raise exceptions.HttpException(
            e, error_format="Subject {} not found.".format(subject)
        )
  else:
    log.status.Print("Deleting subject config for [%s]." % subject)
    request = message.ManagedkafkaProjectsLocationsSchemaRegistriesConfigDeleteRequest(
        name=name
    )
    try:
      client.projects_locations_schemaRegistries_config.Delete(request=request)
      log.UpdatedResource(subject, details="config. It is now unset.")
    except apitools_exceptions.HttpNotFoundError as e:
      api_error = exceptions.HttpException(e, HTTP_ERROR_FORMAT)
      log.status.Print(api_error.message)
      if "Resource not found" in api_error.message:
        raise exceptions.HttpException(
            e, error_format="Subject {} not found.".format(subject)
        )


HTTP_ERROR_FORMAT = (
    "ResponseError: code={status_code}, message={status_message}"
)