# Copyright 2020 Google LLC
#
# 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.

"""Plugins for Python 2 GAE."""

import cloudstorage

from google.appengine.api import mail
from google.appengine.api import taskqueue
from google.appengine.api.modules import modules


from tradefed_cluster.plugins import base


class AppManager(base.AppManager):
  """Interface for app manager plugins."""

  def GetInfo(self, name):
    return base.AppInfo(name=name, hostname=modules.get_hostname(module=name))


def _ToFileInfo(stat):
  """Converts a cloudstorage.GCSFileStat to base.FileInfo."""
  return base.FileInfo(
      filename=stat.filename,
      is_dir=stat.is_dir,
      size=stat.st_size,
      content_type=stat.content_type)


class FileStorage(base.FileStorage):
  """Interface for file storage plugins."""

  def ListFiles(self, path):
    it = cloudstorage.listbucket(path)
    return map(_ToFileInfo, it)

  def OpenFile(self, path, mode, content_type, content_encoding):
    try:
      options = {}
      if content_encoding:
        options['content-encoding'] = content_encoding
      return cloudstorage.open(
          filename=path, mode=mode, content_type=content_type, options=options)
    except cloudstorage.NotFoundError:
      raise base.ObjectNotFoundError()


class Mailer(base.Mailer):
  """A GAE mailer. Only work with Titanoboa."""

  def SendMail(self, sender, to, subject, html, reply_to, cc, bcc):
    kwargs = {
        'sender': sender,
        'to': to,
        'subject': subject,
        'html': html
    }
    if reply_to:
      kwargs['reply_to'] = reply_to
    if cc:
      kwargs['cc'] = cc
    if bcc:
      kwargs['bcc'] = bcc
    message = mail.EmailMessage(**kwargs)
    message.send()


class TaskScheduler(base.TaskScheduler):
  """A GAE task scheduler. Only work with Titanoboa."""

  def AddTask(self, queue_name, payload, target, task_name, eta):
    return taskqueue.add(
        queue_name=queue_name,
        payload=payload,
        target=target,
        name=task_name,
        eta=eta)

  def DeleteTask(self, queue_name, task_name):
    taskqueue.Queue(queue_name).delete_tasks_by_name(task_name=task_name)