import logging
import os
import json

from flask import Flask, request, Request, _request_ctx_stack
from flask.ext.principal import Principal
from flask.ext.login import LoginManager, UserMixin
from flask.ext.mail import Mail
from werkzeug.routing import BaseConverter

import features

from avatars.avatars import Avatar
from storage import Storage
from data import model
from data import database
from data.userfiles import Userfiles
from data.users import UserAuthentication
from data.billing import Billing
from data.buildlogs import BuildLogs
from data.archivedlogs import LogArchive
from data.userevent import UserEventsBuilderModule
from data.queue import WorkQueue
from util.saas.analytics import Analytics
from util.saas.exceptionlog import Sentry
from util.names import urn_generator
from util.config.oauth import GoogleOAuthConfig, GithubOAuthConfig, GitLabOAuthConfig
from util.security.signing import Signer
from util.saas.queuemetrics import QueueMetrics
from util.config.provider import FileConfigProvider, TestConfigProvider
from util.config.configutil import generate_secret_key
from util.config.superusermanager import SuperUserManager
from buildman.jobutil.buildreporter import BuildMetrics

OVERRIDE_CONFIG_DIRECTORY = 'conf/stack/'
OVERRIDE_CONFIG_YAML_FILENAME = 'conf/stack/config.yaml'
OVERRIDE_CONFIG_PY_FILENAME = 'conf/stack/config.py'

OVERRIDE_CONFIG_KEY = 'QUAY_OVERRIDE_CONFIG'

CONFIG_PROVIDER = FileConfigProvider(OVERRIDE_CONFIG_DIRECTORY, 'config.yaml', 'config.py')

app = Flask(__name__)
logger = logging.getLogger(__name__)


class RegexConverter(BaseConverter):
  def __init__(self, url_map, *items):
    super(RegexConverter, self).__init__(url_map)
    self.regex = items[0]


app.url_map.converters['regex'] = RegexConverter

# Instantiate the default configuration (for test or for normal operation).
if 'TEST' in os.environ:
  CONFIG_PROVIDER = TestConfigProvider()

  from test.testconfig import TestConfig
  logger.debug('Loading test config.')
  app.config.from_object(TestConfig())
else:
  from config import DefaultConfig
  logger.debug('Loading default config.')
  app.config.from_object(DefaultConfig())
  app.teardown_request(database.close_db_filter)

# Load the override config via the provider.
CONFIG_PROVIDER.update_app_config(app.config)

# Update any configuration found in the override environment variable.
OVERRIDE_CONFIG_KEY = 'QUAY_OVERRIDE_CONFIG'

environ_config = json.loads(os.environ.get(OVERRIDE_CONFIG_KEY, '{}'))
app.config.update(environ_config)


class RequestWithId(Request):
  request_gen = staticmethod(urn_generator(['request']))

  def __init__(self, *args, **kwargs):
    super(RequestWithId, self).__init__(*args, **kwargs)
    self.request_id = self.request_gen()


@app.before_request
def _request_start():
  logger.debug('Starting request: %s', request.path)


@app.after_request
def _request_end(r):
  logger.debug('Ending request: %s', request.path)
  return r


class InjectingFilter(logging.Filter):
  def filter(self, record):
    if _request_ctx_stack.top is not None:
      record.msg = '[%s] %s' % (request.request_id, record.msg)
    return True

# Add the request id filter to all handlers of the root logger
for handler in logging.getLogger().handlers:
  handler.addFilter(InjectingFilter())

app.request_class = RequestWithId

features.import_features(app.config)

Principal(app, use_sessions=False)

avatar = Avatar(app)
login_manager = LoginManager(app)
mail = Mail(app)
storage = Storage(app)
userfiles = Userfiles(app, storage)
log_archive = LogArchive(app, storage)
analytics = Analytics(app)
billing = Billing(app)
sentry = Sentry(app)
build_logs = BuildLogs(app)
authentication = UserAuthentication(app, OVERRIDE_CONFIG_DIRECTORY)
userevents = UserEventsBuilderModule(app)
superusers = SuperUserManager(app)
signer = Signer(app, OVERRIDE_CONFIG_DIRECTORY)
queue_metrics = QueueMetrics(app)
build_metrics = BuildMetrics(app)

tf = app.config['DB_TRANSACTION_FACTORY']

github_login = GithubOAuthConfig(app.config, 'GITHUB_LOGIN_CONFIG')
github_trigger = GithubOAuthConfig(app.config, 'GITHUB_TRIGGER_CONFIG')
gitlab_trigger = GitLabOAuthConfig(app.config, 'GITLAB_TRIGGER_CONFIG')
google_login = GoogleOAuthConfig(app.config, 'GOOGLE_LOGIN_CONFIG')
oauth_apps = [github_login, github_trigger, gitlab_trigger, google_login]

image_diff_queue = WorkQueue(app.config['DIFFS_QUEUE_NAME'], tf)
dockerfile_build_queue = WorkQueue(app.config['DOCKERFILE_BUILD_QUEUE_NAME'], tf,
                                   reporter=queue_metrics.report)
notification_queue = WorkQueue(app.config['NOTIFICATION_QUEUE_NAME'], tf)

database.configure(app.config)
model.config.app_config = app.config
model.config.store = storage

# Generate a secret key if none was specified.
if app.config['SECRET_KEY'] is None:
  logger.debug('Generating in-memory secret key')
  app.config['SECRET_KEY'] = generate_secret_key()

@login_manager.user_loader
def load_user(user_uuid):
  logger.debug('User loader loading deferred user with uuid: %s' % user_uuid)
  return LoginWrappedDBUser(user_uuid)

class LoginWrappedDBUser(UserMixin):
  def __init__(self, user_uuid, db_user=None):
    self._uuid = user_uuid
    self._db_user = db_user

  def db_user(self):
    if not self._db_user:
      self._db_user = model.user.get_user_by_uuid(self._uuid)
    return self._db_user

  def is_authenticated(self):
    return self.db_user() is not None

  def is_active(self):
    return self.db_user().verified

  def get_id(self):
    return unicode(self._uuid)

def get_app_url():
  return '%s://%s' % (app.config['PREFERRED_URL_SCHEME'], app.config['SERVER_HOSTNAME'])