import logging
import datetime
import os

from flask import make_response, render_template, request, session
from flask_login import login_user
from flask_principal import identity_changed

import endpoints.decorated  # Register the various exceptions via decorators.
import features

from app import app, oauth_apps, oauth_login, LoginWrappedDBUser, user_analytics, IS_KUBERNETES
from auth import scopes
from auth.permissions import QuayDeferredPermissionUser
from config import frontend_visible_config
from external_libraries import get_external_javascript, get_external_css
from endpoints.common_models_pre_oci import pre_oci_model as model
from endpoints.csrf import generate_csrf_token, QUAY_CSRF_UPDATED_HEADER_NAME
from util.config.provider.k8sprovider import QE_NAMESPACE
from util.secscan import PRIORITY_LEVELS
from util.saas.useranalytics import build_error_callback
from util.timedeltastring import convert_to_timedelta
from _init import __version__


logger = logging.getLogger(__name__)


JS_BUNDLE_NAME = 'bundle'


def common_login(user_uuid, permanent_session=True):
  """ Performs login of the given user, with optional non-permanence on the session.
      Returns a tuple with (success, headers to set on success).
  """
  user = model.get_user(user_uuid)
  if user is None:
    return (False, None)

  if login_user(LoginWrappedDBUser(user_uuid)):
    logger.debug('Successfully signed in as user %s with uuid %s', user.username, user_uuid)
    new_identity = QuayDeferredPermissionUser.for_id(user_uuid)
    identity_changed.send(app, identity=new_identity)
    session['login_time'] = datetime.datetime.now()

    if permanent_session and features.PERMANENT_SESSIONS:
      session_timeout_str = app.config.get('SESSION_TIMEOUT', '31d')
      session.permanent = True
      session.permanent_session_lifetime = convert_to_timedelta(session_timeout_str)

    # Inform our user analytics that we have a new "lead"
    create_lead_future = user_analytics.create_lead(
      user.email,
      user.username,
      user.given_name,
      user.family_name,
      user.company,
      user.location,
    )

    create_lead_future.add_done_callback(build_error_callback('Create lead failed'))

    # Force a new CSRF token.
    headers = {}
    headers[QUAY_CSRF_UPDATED_HEADER_NAME] = generate_csrf_token(force=True)
    return (True, headers)

  logger.debug('User could not be logged in, inactive?')
  return (False, None)


def _list_files(path, extension, contains=""):
  """ Returns a list of all the files with the given extension found under the given path. """
  def matches(f):
    return os.path.splitext(f)[1] == '.' + extension and contains in os.path.splitext(f)[0]

  def join_path(dp, f):
    # Remove the static/ prefix. It is added in the template.
    return os.path.join(dp, f)[len('static/'):]

  filepath = os.path.join('static/', path)
  return [join_path(dp, f) for dp, _, files in os.walk(filepath) for f in files if matches(f)]


FONT_AWESOME_5 = 'use.fontawesome.com/releases/v5.0.4/css/all.css'


def render_page_template(name, route_data=None, **kwargs):
  """ Renders the page template with the given name as the response and returns its contents. """
  main_scripts = _list_files('build', 'js', JS_BUNDLE_NAME)

  use_cdn = app.config.get('USE_CDN', True)
  if request.args.get('use_cdn') is not None:
    use_cdn = request.args.get('use_cdn') == 'true'

  external_styles = get_external_css(local=not use_cdn, exclude=FONT_AWESOME_5)
  external_scripts = get_external_javascript(local=not use_cdn)

  # Add Stripe checkout if billing is enabled.
  if features.BILLING:
    external_scripts.append('//checkout.stripe.com/checkout.js')

  def get_external_login_config():
    login_config = []
    for login_service in oauth_login.services:
      login_config.append({
        'id': login_service.service_id(),
        'title': login_service.service_name(),
        'config': login_service.get_public_config(),
        'icon': login_service.get_icon(),
      })

    return login_config

  def get_oauth_config():
    oauth_config = {}
    for oauth_app in oauth_apps:
      oauth_config[oauth_app.key_name] = oauth_app.get_public_config()

    return oauth_config

  has_contact = len(app.config.get('CONTACT_INFO', [])) > 0
  contact_href = None
  if len(app.config.get('CONTACT_INFO', [])) == 1:
    contact_href = app.config['CONTACT_INFO'][0]

  version_number = ''
  if not features.BILLING:
    version_number = 'Quay %s' % __version__

  scopes_set = {scope.scope: scope._asdict() for scope in scopes.app_scopes(app.config).values()}

  contents = render_template(name,
                             registry_state=app.config.get('REGISTRY_STATE', 'normal'),
                             route_data=route_data,
                             external_styles=external_styles,
                             external_scripts=external_scripts,
                             main_scripts=main_scripts,
                             feature_set=features.get_features(),
                             config_set=frontend_visible_config(app.config),
                             oauth_set=get_oauth_config(),
                             external_login_set=get_external_login_config(),
                             scope_set=scopes_set,
                             vuln_priority_set=PRIORITY_LEVELS,
                             mixpanel_key=app.config.get('MIXPANEL_KEY', ''),
                             munchkin_key=app.config.get('MARKETO_MUNCHKIN_ID', ''),
                             recaptcha_key=app.config.get('RECAPTCHA_SITE_KEY', ''),
                             google_tagmanager_key=app.config.get('GOOGLE_TAGMANAGER_KEY', ''),
                             google_anaytics_key=app.config.get('GOOGLE_ANALYTICS_KEY', ''),
                             sentry_public_dsn=app.config.get('SENTRY_PUBLIC_DSN', ''),
                             is_debug=str(app.config.get('DEBUGGING', False)).lower(),
                             aci_conversion=features.ACI_CONVERSION,
                             has_billing=features.BILLING,
                             onprem=not app.config.get('FEATURE_BILLING', False),
                             contact_href=contact_href,
                             has_contact=has_contact,
                             hostname=app.config['SERVER_HOSTNAME'],
                             preferred_scheme=app.config['PREFERRED_URL_SCHEME'],
                             version_number=version_number,
                             current_year=datetime.datetime.now().year,
                             kubernetes_namespace=IS_KUBERNETES and QE_NAMESPACE,
                             **kwargs)

  resp = make_response(contents)
  resp.headers['X-FRAME-OPTIONS'] = 'DENY'
  return resp