import bcrypt

from database import User, Repository, Image, RepositoryImage, AccessToken


def create_user(username, password, email):
  pw_hash = bcrypt.hashpw(password, bcrypt.gensalt())
  new_user = User.create(username=username, password_hash=pw_hash,
                         email=email)
  return new_user


def verify_user(username, password):
  try:
    fetched = User.get(User.username == username)
  except User.DoesNotExist:
    return None

  if bcrypt.hashpw(password, fetched.password_hash) == fetched.password_hash:
    return fetched

  # We weren't able to authorize the user
  return None


def change_password(user, new_password):
  pw_hash = bcrypt.hashpw(new_password, bcrypt.gensalt())
  user.password_hash = pw_hash
  user.save()


def update_email(user, new_email):
  user.email = new_email
  user.verified = False
  user.save()


def create_or_fetch_repository(namespace, name):
  try:
    repo = Repository.get(Repository.name == name and 
                          Repository.namespace == namespace)
  except Repository.DoesNotExist:
    repo = Repository.create(namespace=namespace, name=name)
  return repo


def create_image(image_id):
  new_image = Image.create(image_id=image_id)
  return new_image


def set_image_checksum(image_id, checksum):
  fetched = Image.get(Image.image_id == image_id)
  fetched.checksum = checksum
  fetched.save()
  return fetched


def assign_image_repository(repository, image, tag):
  repo_image = RepositoryImage.create(repository=repository, image=image,
                                      tag=tag)
  return repo_image


def get_repository_images(namespace_name, repository_name):
  select = Image.select(Image, RepositoryImage)
  joined = select.join(RepositoryImage).join(Repository)
  return joined.where(Repository.name == repository_name and 
                      Repository.namespace == namespace_name)


def create_access_token(repository):
  new_token = AccessToken.create(repository=repository)
  return new_token


def verify_token(namespace_name, repository_name, code):
  try:
    fetched_repo = Repository.get(Repository.namespace == namespace_name and
                                  Repository.name == repository_name)
  except Repository.DoesNotExist:
    return None

  try:
    fetched = AccessToken.get(AccessToken.code == code and 
                              AccessToken.repository == fetched_repo)
  except AccessToken.DoesNotExist:
    return None

  return fetched