import logging
import urlparse
import json
import string

from flask import make_response, render_template, request, abort
from flask.ext.login import login_user, UserMixin
from flask.ext.principal import identity_changed
from random import SystemRandom

from data import model
from data.queue import dockerfile_build_queue
from app import app, login_manager
from auth.permissions import QuayDeferredPermissionUser
from auth import scopes
from endpoints.api.discovery import swagger_route_data
from werkzeug.routing import BaseConverter
from functools import wraps
from config import getFrontendVisibleConfig

import features

logger = logging.getLogger(__name__)

route_data = None

class RepoPathConverter(BaseConverter):
  regex = '[\.a-zA-Z0-9_\-]+/[\.a-zA-Z0-9_\-]+'
  weight = 200

app.url_map.converters['repopath'] = RepoPathConverter

def route_show_if(value):
  def decorator(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
      if not value:
        abort(404)

      return f(*args, **kwargs)
    return decorated_function
  return decorator


def route_hide_if(value):
  def decorator(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
      if value:
        abort(404)

      return f(*args, **kwargs)
    return decorated_function
  return decorator


def get_route_data():
  global route_data
  if route_data:
    return route_data

  route_data = swagger_route_data(include_internal=True, compact=True)
  return route_data


def truthy_param(param):
  return param not in {False, 'false', 'False', '0', 'FALSE', '', 'null'}


@login_manager.user_loader
def load_user(username):
  logger.debug('User loader loading deferred user: %s' % username)
  return _LoginWrappedDBUser(username)


class _LoginWrappedDBUser(UserMixin):
  def __init__(self, db_username, db_user=None):

    self._db_username = db_username
    self._db_user = db_user

  def db_user(self):
    if not self._db_user:
      self._db_user = model.get_user(self._db_username)
    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._db_username)


def common_login(db_user):
  if login_user(_LoginWrappedDBUser(db_user.username, db_user)):
    logger.debug('Successfully signed in as: %s' % db_user.username)
    new_identity = QuayDeferredPermissionUser(db_user.username, 'username', {scopes.DIRECT_LOGIN})
    identity_changed.send(app, identity=new_identity)
    return True
  else:
    logger.debug('User could not be logged in, inactive?.')
    return False


@app.errorhandler(model.DataModelException)
def handle_dme(ex):
  logger.exception(ex)
  return make_response(json.dumps({'message': ex.message}), 400)


def random_string():
  random = SystemRandom()
  return ''.join([random.choice(string.ascii_uppercase + string.digits) for _ in range(8)])

def render_page_template(name, **kwargs):
  library_styles = []
  main_styles = ['dist/quay-frontend.css']

  library_scripts = []
  main_scripts = ['dist/quay-frontend.min.js']

  cache_buster = random_string()

  resp = make_response(render_template(name, route_data=json.dumps(get_route_data()),
                                       main_styles=main_styles,
                                       library_styles=library_styles,
                                       main_scripts=main_scripts,
                                       library_scripts=library_scripts,
                                       feature_set=json.dumps(features.get_features()),
                                       config_set=json.dumps(getFrontendVisibleConfig(app.config)),
                                       mixpanel_key=app.config.get('MIXPANEL_KEY', ''),
                                       is_debug=str(app.config.get('DEBUGGING', False)).lower(),
                                       show_chat=features.OLARK_CHAT,
                                       cache_buster=cache_buster,
                                       **kwargs))

  resp.headers['X-FRAME-OPTIONS'] = 'DENY'
  return resp


def check_repository_usage(user_or_org, plan_found):
  private_repos = model.get_private_repo_count(user_or_org.username)
  repos_allowed = plan_found['privateRepos']

  if private_repos > repos_allowed:
    model.create_notification('over_private_usage', user_or_org, {'namespace': user_or_org.username})
  else:
    model.delete_notifications_by_kind(user_or_org, 'over_private_usage')


def start_build(repository, dockerfile_id, tags, build_name, subdir, manual,
                trigger=None, pull_robot_name=None):
  host = urlparse.urlparse(request.url).netloc
  repo_path = '%s/%s/%s' % (host, repository.namespace, repository.name)

  token = model.create_access_token(repository, 'write')
  logger.debug('Creating build %s with repo %s tags %s and dockerfile_id %s',
               build_name, repo_path, tags, dockerfile_id)

  job_config = {
    'docker_tags': tags,
    'repository': repo_path,
    'build_subdir': subdir
  }

  build_request = model.create_repository_build(repository, token, job_config,
                                                dockerfile_id, build_name,
                                                trigger, pull_robot_name = pull_robot_name)

  dockerfile_build_queue.put([repository.namespace, repository.name], json.dumps({
    'build_uuid': build_request.uuid,
    'namespace': repository.namespace,
    'repository': repository.name,
    'pull_credentials': model.get_pull_credentials(pull_robot_name) if pull_robot_name else None
  }), retries_remaining=1)

  metadata = {
    'repo': repository.name,
    'namespace': repository.namespace,
    'fileid': dockerfile_id,
    'manual': manual,
  }

  if trigger:
    metadata['trigger_id'] = trigger.uuid
    metadata['config'] = json.loads(trigger.config)
    metadata['service'] = trigger.service.name

  model.log_action('build_dockerfile', repository.namespace,
                   ip=request.remote_addr, metadata=metadata,
                   repository=repository)

  return build_request