import logging
import requests

from flask import (abort, send_file, redirect, request, url_for,
                   render_template, make_response)
from flask.ext.login import login_user, UserMixin, login_required, logout_user
from flask.ext.principal import identity_changed, Identity, AnonymousIdentity

from data import model
from app import app, login_manager


logger = logging.getLogger(__name__)


class _LoginWrappedDBUser(UserMixin):
  def __init__(self, db_user):
    self.db_user = db_user

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

  def get_id(self):
    return unicode(self.db_user.username)


@login_manager.user_loader
def load_user(username):
  logger.debug('Loading user: %s' % username)
  db_user = model.get_user(username)
  if db_user:
    return _LoginWrappedDBUser(db_user)
  else:
    return None


@app.route('/', methods=['GET'])
def index():
  return send_file('templates/index.html')


@app.route('/status', methods=['GET'])
def status():
  return make_response('Healthy')


@app.route('/tos', methods=['GET'])
def tos():
  return send_file('templates/tos.html')


@app.route('/privacy', methods=['GET'])
def privacy():
  return send_file('templates/privacy.html')


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


@app.route('/signin', methods=['GET'])
def render_signin_page():
  return render_template('signin.html', 
                         github_client_id=app.config['GITHUB_CLIENT_ID'])


@app.route('/signin', methods=['POST'])
def signin():
  username = request.form['username']
  password = request.form['password']

  #TODO Allow email login
  verified = model.verify_user(username, password)
  if verified:
    if common_login(verified):
      return redirect(request.args.get('next') or url_for('index'))
    else:
      return render_template('signin.html',
                             needs_email_verification=True,
                             github_client_id=app.config['GITHUB_CLIENT_ID'])

  else:
    return render_template('signin.html',
                           username=username,
                           invalid_credentials=True,
                           github_client_id=app.config['GITHUB_CLIENT_ID'])


@app.route('/oauth2/github/callback', methods=['GET'])
def github_oauth_callback():
  code = request.args.get('code')
  payload = {
    'client_id': app.config['GITHUB_CLIENT_ID'],
    'client_secret': app.config['GITHUB_CLIENT_SECRET'],
    'code': code,
  }
  headers = {
    'Accept': 'application/json'
  }

  get_access_token = requests.post(app.config['GITHUB_TOKEN_URL'],
                                   params=payload, headers=headers)

  token = get_access_token.json()['access_token']

  token_param = {
    'access_token': token,
  }
  get_user = requests.get(app.config['GITHUB_USER_URL'], params=token_param)

  user_data = get_user.json()
  username = user_data['login']
  github_id = user_data['id']

  v3_media_type = {
    'Accept': 'application/vnd.github.v3'
  }
  get_email = requests.get(app.config['GITHUB_USER_EMAILS'],
                           params=token_param, headers=v3_media_type)

  # We will accept any email, but we prefer the primary
  found_email = None
  for user_email in get_email.json():
    found_email = user_email['email']
    if user_email['primary']:
      break

  to_login = model.verify_federated_login('github', github_id)
  if not to_login:
    # try to create the user
    to_login = model.create_federated_user(username, found_email, 'github',
                                           github_id)

  if common_login(to_login):
    return redirect(url_for('index'))

  # TODO something bad happened, we need to tell the user somehow
  return redirect(url_for('signin'))


@app.route('/confirm', methods=['GET'])
def confirm_email():
  code = request.values['code']
  user = model.confirm_user_email(code)

  common_login(user)

  return redirect(url_for('index'))


@app.route('/reset', methods=['GET'])
def password_reset():
  pass


@app.route("/signout")
@login_required
def logout():
    logout_user()

    identity_changed.send(app, identity=AnonymousIdentity())

    return redirect(url_for('index'))