# Copyright 2015 Google Inc. 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.

"""Facility for displaying information about a Job message to a user.
"""

from __future__ import absolute_import
from __future__ import unicode_literals
from googlecloudsdk.api_lib.dataflow import apis
from googlecloudsdk.core.util import times


def FormatDateTime(string):
  """Returns a yyyy-mm-dd hh:mm:ss formatted date/time for string."""
  dt = times.ParseDateTime(string)
  if not times.GetTimeStampFromDateTime(dt):
    return None
  return times.FormatDateTime(dt, '%Y-%m-%d %H:%M:%S')


class DisplayInfo(object):
  """Information about a job displayed in command output.

  Fields:
    id: the job ID
    name: the job name
    type: one of 'batch', 'streaming'
    state: string representing the current job status
    creationTime: in the form yyyy-mm-dd hh:mm:ss
    stateTime: in the form yyyy-mm-dd hh:mm:ss
    location: the job's regional endpoint
  """

  def __init__(self, job):
    self.id = job.id
    self.name = job.name
    self.type = DisplayInfo._JobTypeForJob(job.type)
    self.state = DisplayInfo._StatusForJob(job.currentState)
    self.location = job.location

    # We ignore these errors to make the field names more consistent across
    # commands using the --filter argument. This is because most commands are
    # more or less a straight dump of the API response which has camel-case
    # naming conventions. This class is only used for formatting jobs for
    # display purposes.
    #
    # Don't worry, be happy.
    #
    # pylint: disable=invalid-name
    self.stateTime = FormatDateTime(job.currentStateTime)
    self.creationTime = FormatDateTime(job.createTime)
    # pylint: enable=invalid-name

  @staticmethod
  def _JobTypeForJob(job_type):
    """Return a string describing the job type.

    Args:
      job_type: The job type enum
    Returns:
      string describing the job type
    """
    type_value_enum = apis.GetMessagesModule().Job.TypeValueValuesEnum
    value_map = {
        type_value_enum.JOB_TYPE_BATCH: 'Batch',
        type_value_enum.JOB_TYPE_STREAMING: 'Streaming',
    }
    return value_map.get(job_type, 'Unknown')

  @staticmethod
  def _StatusForJob(job_state):
    """Return a string describing the job state.

    Args:
      job_state: The job state enum
    Returns:
      string describing the job state
    """
    state_value_enum = apis.GetMessagesModule().Job.CurrentStateValueValuesEnum
    value_map = {
        state_value_enum.JOB_STATE_CANCELLED: 'Cancelled',
        state_value_enum.JOB_STATE_DONE: 'Done',
        state_value_enum.JOB_STATE_FAILED: 'Failed',
        state_value_enum.JOB_STATE_RUNNING: 'Running',
        state_value_enum.JOB_STATE_STOPPED: 'Stopped',
        state_value_enum.JOB_STATE_UPDATED: 'Updated',
    }
    return value_map.get(job_state, 'Unknown')
