import logging

from notificationhelper import build_event_data
from util.jinjautil import get_template_env

template_env = get_template_env("events")
logger = logging.getLogger(__name__)

class InvalidNotificationEventException(Exception):
  pass

class NotificationEvent(object):
  def __init__(self):
    pass

  def get_level(self, event_data, notification_data):
    """
    Returns a 'level' representing the severity of the event.
    Valid values are: 'info', 'warning', 'error', 'primary', 'success'
    """
    raise NotImplementedError

  def get_summary(self, event_data, notification_data):
    """
    Returns a human readable one-line summary for the given notification data.
    """
    raise NotImplementedError

  def get_message(self, event_data, notification_data):
    """
    Returns a human readable HTML message for the given notification data.
    """
    return template_env.get_template(self.event_name() + '.html').render({
      'event_data': event_data,
      'notification_data': notification_data
    })

  def get_sample_data(self, repository=None):
    """
    Returns sample data for testing the raising of this notification, with an optional
    repository.
    """
    raise NotImplementedError

  @classmethod
  def event_name(cls):
    """
    Particular event implemented by subclasses.
    """
    raise NotImplementedError

  @classmethod
  def get_event(cls, eventname):
    for subc in cls.__subclasses__():
      if subc.event_name() == eventname:
        return subc()

    raise InvalidNotificationEventException('Unable to find event: %s' % eventname)


class RepoPushEvent(NotificationEvent):
  @classmethod
  def event_name(cls):
    return 'repo_push'

  def get_level(self, event_data, notification_data):
    return 'primary'

  def get_summary(self, event_data, notification_data):
    return 'Repository %s updated' % (event_data['repository'])

  def get_sample_data(self, repository):
    return build_event_data(repository, {
      'updated_tags': {'latest': 'someimageid', 'foo': 'anotherimage'},
      'pruned_image_count': 3
    })


class BuildQueueEvent(NotificationEvent):
  @classmethod
  def event_name(cls):
    return 'build_queued'

  def get_level(self, event_data, notification_data):
    return 'info'

  def get_sample_data(self, repository):
    build_uuid = 'fake-build-id'

    return build_event_data(repository, {
      'is_manual': False,
      'build_id': build_uuid,
      'build_name': 'some-fake-build',
      'docker_tags': ['latest', 'foo', 'bar'],
      'trigger_kind': 'GitHub',
      'trigger_metadata': {
        "default_branch": "master",
        "ref": "refs/heads/somebranch",
        "commit_sha": "42d4a62c53350993ea41069e9f2cfdefb0df097d"
      }
    }, subpage='/build?current=%s' % build_uuid)

  def get_summary(self, event_data, notification_data):
    return 'Build queued for repository %s' % (event_data['repository'])


class BuildStartEvent(NotificationEvent):
  @classmethod
  def event_name(cls):
    return 'build_start'

  def get_level(self, event_data, notification_data):
    return 'info'

  def get_sample_data(self, repository):
    build_uuid = 'fake-build-id'

    return build_event_data(repository, {
      'build_id': build_uuid,
      'build_name': 'some-fake-build',
      'docker_tags': ['latest', 'foo', 'bar'],
      'trigger_kind': 'GitHub',
      'trigger_metadata': {
        "default_branch": "master",
        "ref": "refs/heads/somebranch",
        "commit_sha": "42d4a62c53350993ea41069e9f2cfdefb0df097d"
      }
    }, subpage='/build?current=%s' % build_uuid)

  def get_summary(self, event_data, notification_data):
    return 'Build started for repository %s' % (event_data['repository'])


class BuildSuccessEvent(NotificationEvent):
  @classmethod
  def event_name(cls):
    return 'build_success'

  def get_level(self, event_data, notification_data):
    return 'success'

  def get_sample_data(self, repository):
    build_uuid = 'fake-build-id'

    return build_event_data(repository, {
      'build_id': build_uuid,
      'build_name': 'some-fake-build',
      'docker_tags': ['latest', 'foo', 'bar'],
      'trigger_kind': 'GitHub',
      'trigger_metadata': {
        "default_branch": "master",
        "ref": "refs/heads/somebranch",
        "commit_sha": "42d4a62c53350993ea41069e9f2cfdefb0df097d"
      },
      'image_id': '1245657346'
    }, subpage='/build?current=%s' % build_uuid)

  def get_summary(self, event_data, notification_data):
    return 'Build succeeded for repository %s' % (event_data['repository'])


class BuildFailureEvent(NotificationEvent):
  @classmethod
  def event_name(cls):
    return 'build_failure'

  def get_level(self, event_data, notification_data):
    return 'error'

  def get_sample_data(self, repository):
    build_uuid = 'fake-build-id'

    return build_event_data(repository, {
      'build_id': build_uuid,
      'build_name': 'some-fake-build',
      'docker_tags': ['latest', 'foo', 'bar'],
      'trigger_kind': 'GitHub',
      'error_message': 'This is a fake error message',
      'trigger_metadata': {
        "default_branch": "master",
        "ref": "refs/heads/somebranch",
        "commit_sha": "42d4a62c53350993ea41069e9f2cfdefb0df097d"
      }
    }, subpage='/build?current=%s' % build_uuid)

  def get_summary(self, event_data, notification_data):
    return 'Build failure for repository %s' % (event_data['repository'])