import json

from datetime import datetime, timedelta

from endpoints.api import (resource, nickname, ApiResource, query_param, parse_args,
                           RepositoryParamResource, require_repo_admin, related_user_resource,
                           format_date, Unauthorized, NotFound, require_user_admin,
                           internal_only, path_param, require_scope)
from auth.permissions import AdministerOrganizationPermission, AdministerOrganizationPermission
from auth.auth_context import get_authenticated_user
from data import model
from auth import scopes


def log_view(log):
  view = {
    'kind': log.kind.name,
    'metadata': json.loads(log.metadata_json),
    'ip': log.ip,
    'datetime': format_date(log.datetime),
  }

  if log.performer and log.performer.username:
    view['performer'] = {
      'kind': 'user',
      'name': log.performer.username,
      'is_robot': log.performer.robot,
    }

  return view


def get_logs(start_time, end_time, performer_name=None, repository=None, namespace=None):
  performer = None
  if performer_name:
    performer = model.get_user(performer_name)

  if start_time:
    try:
      start_time = datetime.strptime(start_time + ' UTC', '%m/%d/%Y %Z')
    except ValueError:
      start_time = None

  if not start_time:
    start_time = datetime.today() - timedelta(7) # One week

  if end_time:
    try:
      end_time = datetime.strptime(end_time + ' UTC', '%m/%d/%Y %Z')
      end_time = end_time + timedelta(days=1)
    except ValueError:
      end_time = None

  if not end_time:
    end_time = datetime.today()

  logs = model.list_logs(start_time, end_time, performer=performer, repository=repository,
                         namespace=namespace)
  return {
    'start_time': format_date(start_time),
    'end_time': format_date(end_time),
    'logs': [log_view(log) for log in logs]
  }


@resource('/v1/repository/<repopath:repository>/logs')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
class RepositoryLogs(RepositoryParamResource):
  """ Resource for fetching logs for the specific repository. """
  @require_repo_admin
  @nickname('listRepoLogs')
  @parse_args
  @query_param('starttime', 'Earliest time from which to get logs (%m/%d/%Y %Z)', type=str)
  @query_param('endtime', 'Latest time to which to get logs (%m/%d/%Y %Z)', type=str)
  def get(self, args, namespace, repository):
    """ List the logs for the specified repository. """
    repo = model.get_repository(namespace, repository)
    if not repo:
      raise NotFound()

    start_time = args['starttime']
    end_time = args['endtime']
    return get_logs(start_time, end_time, repository=repo, namespace=namespace)


@resource('/v1/user/logs')
@internal_only
class UserLogs(ApiResource):
  """ Resource for fetching logs for the current user. """
  @require_user_admin
  @nickname('listUserLogs')
  @parse_args
  @query_param('starttime', 'Earliest time from which to get logs. (%m/%d/%Y %Z)', type=str)
  @query_param('endtime', 'Latest time to which to get logs. (%m/%d/%Y %Z)', type=str)
  @query_param('performer', 'Username for which to filter logs.', type=str)
  def get(self, args):
    """ List the logs for the current user. """
    performer_name = args['performer']
    start_time = args['starttime']
    end_time = args['endtime']

    user = get_authenticated_user()
    return get_logs(start_time, end_time, performer_name=performer_name, namespace=user.username)


@resource('/v1/organization/<orgname>/logs')
@path_param('orgname', 'The name of the organization')
@related_user_resource(UserLogs)
class OrgLogs(ApiResource):
  """ Resource for fetching logs for the entire organization. """
  @nickname('listOrgLogs')
  @parse_args
  @query_param('starttime', 'Earliest time from which to get logs. (%m/%d/%Y %Z)', type=str)
  @query_param('endtime', 'Latest time to which to get logs. (%m/%d/%Y %Z)', type=str)
  @query_param('performer', 'Username for which to filter logs.', type=str)
  @require_scope(scopes.ORG_ADMIN)
  def get(self, args, orgname):
    """ List the logs for the specified organization. """
    permission = AdministerOrganizationPermission(orgname)
    if permission.can():
      performer_name = args['performer']
      start_time = args['starttime']
      end_time = args['endtime']

      return get_logs(start_time, end_time, namespace=orgname, performer_name=performer_name)

    raise Unauthorized()