import hashlib
import json
import logging
import os

from functools import partial

from Crypto.PublicKey import RSA
from flask import Flask, request, Request
from flask_login import LoginManager
from flask_mail import Mail
from flask_principal import Principal
from jwkest.jwk import RSAKey

import features
from _init import CONF_DIR
from auth.auth_context import get_authenticated_user
from avatars.avatars import Avatar
from buildman.manager.buildcanceller import BuildCanceller
from data import database
from data import model
from data.archivedlogs import LogArchive
from data.billing import Billing
from data.buildlogs import BuildLogs
from data.cache import get_model_cache
from data.model.user import LoginWrappedDBUser
from data.queue import WorkQueue, BuildMetricQueueReporter
from data.userevent import UserEventsBuilderModule
from data.userfiles import Userfiles
from data.users import UserAuthentication
from path_converters import RegexConverter, RepositoryPathConverter, APIRepositoryPathConverter
from oauth.services.github import GithubOAuthService
from oauth.services.gitlab import GitLabOAuthService
from oauth.loginmanager import OAuthLoginManager
from storage import Storage
from util.log import filter_logs
from util import get_app_url
from util.ipresolver import IPResolver
from util.saas.analytics import Analytics
from util.saas.useranalytics import UserAnalytics
from util.saas.exceptionlog import Sentry
from util.names import urn_generator
from util.config.configutil import generate_secret_key
from util.config.provider import get_config_provider
from util.config.superusermanager import SuperUserManager
from util.label_validator import LabelValidator
from util.metrics.metricqueue import MetricQueue
from util.metrics.prometheus import PrometheusPlugin
from util.saas.cloudwatch import start_cloudwatch_sender
from util.secscan.api import SecurityScannerAPI
from util.tufmetadata.api import TUFMetadataAPI
from util.security.instancekeys import InstanceKeys
from util.security.signing import Signer


OVERRIDE_CONFIG_DIRECTORY = os.path.join(CONF_DIR, 'stack/')
OVERRIDE_CONFIG_YAML_FILENAME = os.path.join(CONF_DIR, 'stack/config.yaml')
OVERRIDE_CONFIG_PY_FILENAME = os.path.join(CONF_DIR, 'stack/config.py')

OVERRIDE_CONFIG_KEY = 'QUAY_OVERRIDE_CONFIG'

DOCKER_V2_SIGNINGKEY_FILENAME = 'docker_v2.pem'

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

# Instantiate the configuration.
is_testing = 'TEST' in os.environ
is_kubernetes = 'KUBERNETES_SERVICE_HOST' in os.environ
config_provider = get_config_provider(OVERRIDE_CONFIG_DIRECTORY, 'config.yaml', 'config.py',
                                      testing=is_testing, kubernetes=is_kubernetes)

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

# Allow user to define a custom storage preference for the local instance.
_distributed_storage_preference = os.environ.get('QUAY_DISTRIBUTED_STORAGE_PREFERENCE', '').split()
if _distributed_storage_preference:
  app.config['DISTRIBUTED_STORAGE_PREFERENCE'] = _distributed_storage_preference

# 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()

# If the "preferred" scheme is https, then http is not allowed. Therefore, ensure we have a secure
# session cookie.
if (app.config['PREFERRED_URL_SCHEME'] == 'https' and
    not app.config.get('FORCE_NONSECURE_SESSION_COOKIE', False)):
  app.config['SESSION_COOKIE_SECURE'] = True

# Load features from config.
features.import_features(app.config)

CONFIG_DIGEST = hashlib.sha256(json.dumps(app.config, default=str)).hexdigest()[0:8]

logger.debug("Loaded config", extra={"config": app.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 (%s)', request.request_id, request.path,
               extra={"request_id": request.request_id})


DEFAULT_FILTER = lambda x: '[FILTERED]'
FILTERED_VALUES = [
  {'key': ['password'], 'fn': DEFAULT_FILTER},
  {'key': ['user', 'password'], 'fn': DEFAULT_FILTER},
  {'key': ['blob'], 'fn': lambda x: x[0:8]}
]


@app.after_request
def _request_end(resp):
  jsonbody = request.get_json(force=True, silent=True)
  values = request.values.to_dict()

  if jsonbody and not isinstance(jsonbody, dict):
    jsonbody = {'_parsererror': jsonbody}

  if isinstance(values, dict):
    filter_logs(values, FILTERED_VALUES)

  extra = {
    "endpoint": request.endpoint,
    "request_id" : request.request_id,
    "remote_addr": request.remote_addr,
    "http_method": request.method,
    "original_url": request.url,
    "path": request.path,
    "parameters":  values,
    "json_body": jsonbody,
    "confsha": CONFIG_DIGEST,
  }

  if request.user_agent is not None:
    extra["user-agent"] = request.user_agent.string

  logger.debug('Ending request: %s (%s)', request.request_id, request.path, extra=extra)
  return resp



root_logger = logging.getLogger()

app.request_class = RequestWithId

# Register custom converters.
app.url_map.converters['regex'] = RegexConverter
app.url_map.converters['repopath'] = RepositoryPathConverter
app.url_map.converters['apirepopath'] = APIRepositoryPathConverter

Principal(app, use_sessions=False)

tf = app.config['DB_TRANSACTION_FACTORY']

model_cache = get_model_cache(app.config)
avatar = Avatar(app)
login_manager = LoginManager(app)
mail = Mail(app)
prometheus = PrometheusPlugin(app)
metric_queue = MetricQueue(prometheus)
chunk_cleanup_queue = WorkQueue(app.config['CHUNK_CLEANUP_QUEUE_NAME'], tf, metric_queue=metric_queue)
instance_keys = InstanceKeys(app)
ip_resolver = IPResolver(app)
storage = Storage(app, metric_queue, chunk_cleanup_queue, instance_keys, config_provider, ip_resolver)
userfiles = Userfiles(app, storage)
log_archive = LogArchive(app, storage)
analytics = Analytics(app)
user_analytics = UserAnalytics(app)
billing = Billing(app)
sentry = Sentry(app)
build_logs = BuildLogs(app)
authentication = UserAuthentication(app, config_provider, OVERRIDE_CONFIG_DIRECTORY)
userevents = UserEventsBuilderModule(app)
superusers = SuperUserManager(app)
signer = Signer(app, config_provider)
instance_keys = InstanceKeys(app)
label_validator = LabelValidator(app)
build_canceller = BuildCanceller(app)

start_cloudwatch_sender(metric_queue, app)

github_trigger = GithubOAuthService(app.config, 'GITHUB_TRIGGER_CONFIG')
gitlab_trigger = GitLabOAuthService(app.config, 'GITLAB_TRIGGER_CONFIG')

oauth_login = OAuthLoginManager(app.config)
oauth_apps = [github_trigger, gitlab_trigger]

image_replication_queue = WorkQueue(app.config['REPLICATION_QUEUE_NAME'], tf,
                                    has_namespace=False, metric_queue=metric_queue)
dockerfile_build_queue = WorkQueue(app.config['DOCKERFILE_BUILD_QUEUE_NAME'], tf,
                                   metric_queue=metric_queue,
                                   reporter=BuildMetricQueueReporter(metric_queue),
                                   has_namespace=True)
notification_queue = WorkQueue(app.config['NOTIFICATION_QUEUE_NAME'], tf, has_namespace=True,
                               metric_queue=metric_queue)
secscan_notification_queue = WorkQueue(app.config['SECSCAN_NOTIFICATION_QUEUE_NAME'], tf,
                                       has_namespace=False,
                                       metric_queue=metric_queue)

# Note: We set `has_namespace` to `False` here, as we explicitly want this queue to not be emptied
# when a namespace is marked for deletion.
namespace_gc_queue = WorkQueue(app.config['NAMESPACE_GC_QUEUE_NAME'], tf, has_namespace=False,
                               metric_queue=metric_queue)

all_queues = [image_replication_queue, dockerfile_build_queue, notification_queue,
              secscan_notification_queue, chunk_cleanup_queue, namespace_gc_queue]

secscan_api = SecurityScannerAPI(app, app.config, storage)
tuf_metadata_api = TUFMetadataAPI(app, app.config)

# Check for a key in config. If none found, generate a new signing key for Docker V2 manifests.
_v2_key_path = os.path.join(OVERRIDE_CONFIG_DIRECTORY, DOCKER_V2_SIGNINGKEY_FILENAME)
if os.path.exists(_v2_key_path):
  docker_v2_signing_key = RSAKey().load(_v2_key_path)
else:
  docker_v2_signing_key = RSAKey(key=RSA.generate(2048))


database.configure(app.config)
model.config.app_config = app.config
model.config.store = storage
model.config.register_image_cleanup_callback(secscan_api.cleanup_layers)
model.config.register_repo_cleanup_callback(tuf_metadata_api.delete_metadata)


@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)


get_app_url = partial(get_app_url, app.config)