import bcrypt
import logging
import dateutil.parser

from database import *


logger = logging.getLogger(__name__)


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 get_user(username):
  try:
    return User.get(User.username == username)
  except User.DoesNotExist:
    return None


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 create_access_token(user, repository):
  new_token = AccessToken.create(user=user, repository=repository)
  return new_token


def verify_token(code, namespace_name, repository_name):
  joined = AccessToken.select(AccessToken, Repository).join(Repository)
  tokens = list(joined.where(AccessToken.code == code,
                             Repository.namespace == namespace_name,
                             Repository.name == repository_name))
  if tokens:
    return tokens[0]
  return None


def get_token(code):
  return AccessToken.get(AccessToken.code == code)


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 get_all_user_permissions(user):
  select = User.select(User, Repository, RepositoryPermission, Role)
  with_repo = select.join(RepositoryPermission).join(Repository)
  with_role = with_repo.switch(RepositoryPermission).join(Role)
  return with_role.where(User.username == user.username)


def get_all_repo_users(namespace_name, repository_name):
  select = RepositoryPermission.select(User.username, Role.name,
                                       RepositoryPermission)
  with_user = select.join(User)
  with_role = with_user.switch(RepositoryPermission).join(Role)
  with_repo = with_role.switch(RepositoryPermission).join(Repository)
  return with_repo.where(Repository.namespace == namespace_name,
                         Repository.name == repository_name)


def get_repository(namespace, name):
  try:
    return Repository.get(Repository.name == name,
                          Repository.namespace == namespace)
  except Repository.DoesNotExist:
    return None


def get_user_repositories(user):
  select = RepositoryPermission.select(RepositoryPermission, Repository, Role)
  with_user = select.join(User).where(User.username == user.username)
  with_role = with_user.switch(RepositoryPermission).join(Role)
  with_repo = with_role.switch(RepositoryPermission).join(Repository)
  return with_repo


def create_repository(namespace, name, owner):
  private = Visibility.get(name='private')
  repo = Repository.create(namespace=namespace, name=name,
                           visibility=private)
  admin = Role.get(name='admin')
  permission = RepositoryPermission.create(user=owner, repository=repo,
                                           role=admin)
  return repo


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


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


def set_image_metadata(image_id, namespace_name, repository_name,
                       created_date_str, comment):
  joined = Image.select().join(Repository)
  image_list = list(joined.where(Repository.name == repository_name,
                            Repository.namespace == namespace_name,
                            Image.image_id == image_id))

  if not image_list:
    raise RuntimeError('No image with specified id and repository')

  fetched = image_list[0]
  fetched.created = dateutil.parser.parse(created_date_str)
  fetched.comment = comment
  fetched.save()
  return fetched


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


def list_repository_tags(namespace_name, repository_name):
  select = RepositoryTag.select(RepositoryTag, Image)
  with_repo = select.join(Repository)
  with_image = with_repo.switch(RepositoryTag).join(Image)
  return with_image.where(Repository.name == repository_name,
                          Repository.namespace == namespace_name)


def get_tag_image(namespace_name, repository_name, tag_name):
  joined = Image.select().join(RepositoryTag).join(Repository)
  fetched = list(joined.where(Repository.name == repository_name,
                              Repository.namespace == namespace_name,
                              RepositoryTag.name == tag_name))

  if not fetched:
    raise Image.DoesNotExist('Unable to find image for tag.')

  return fetched[0]


def create_or_update_tag(namespace_name, repository_name, tag_name,
                         tag_image_id):
  repo = Repository.get(Repository.name == repository_name,
                        Repository.namespace == namespace_name)
  image = Image.get(Image.image_id == tag_image_id)

  try:
    tag = RepositoryTag.get(RepositoryTag.repository == repo,
                            RepositoryTag.name == tag_name)
    tag.image = image
    tag.save()
  except RepositoryTag.DoesNotExist:
    tag = RepositoryTag.create(repository=repo, image=image, name=tag_name)

  return tag


def delete_tag(namespace_name, repository_name, tag_name):
  repo = Repository.get(Repository.name == repository_name,
                        Repository.namespace == namespace_name)
  tag = RepositoryTag.get(RepositoryTag.repository == repo,
                          RepositoryTag.name == tag_name)
  tag.delete_instance()


def delete_all_repository_tags(namespace_name, repository_name):
  repo = Repository.get(Repository.name == repository_name,
                        Repository.namespace == namespace_name)
  RepositoryTag.delete().where(RepositoryTag.repository == repo)


def get_user_repo_permissions(user, repository):
  select = RepositoryPermission.select()
  return select.where(RepositoryPermission.user == user,
                      RepositoryPermission.repository == repository)


def get_user_reponame_permission(user_obj, namespace_name, repository_name):
  repo = Repository.get(Repository.name == repository_name,
                        Repository.namespace == namespace_name)
  perm = RepositoryPermission.get(RepositoryPermission.user == user_obj,
                                  RepositoryPermission.repository == repo)
  return perm


def set_user_repo_permission(user_obj, namespace_name, repository_name,
                             role_name):
  repo = Repository.get(Repository.name == repository_name,
                        Repository.namespace == namespace_name)
  new_role = Role.get(Role.name == role_name)

  # Fetch any existing permission for this user on the repo
  try:
    perm = RepositoryPermission.get(RepositoryPermission.user == user_obj,
                                    RepositoryPermission.repository == repo)
    perm.role = new_role
    perm.save()
    return perm
  except RepositoryPermission.DoesNotExist:
    new_perm = RepositoryPermission.create(repository=repo, user=user_obj,
                                           role=new_role)
    return new_perm

def delete_user_permission(user_obj, namespace_name, repository_name):
  repo = Repository.get(Repository.name == repository_name,
                        Repository.namespace == namespace_name)
  perm = RepositoryPermission.get(RepositoryPermission.user == user_obj,
                                  RepositoryPermission.repository == repo)
  perm.delete_instance()