import logging
import string

from random import SystemRandom
from datetime import datetime

from data.database import initialize_db
from data import model
from app import app


logger = logging.getLogger(__name__)
logging.basicConfig(**app.config['LOGGING_CONFIG'])


def __gen_hex_id(length=64):
  random = SystemRandom()
  return ''.join([random.choice('abcdef' + string.digits)
                  for x in range(length)])


def __gen_checksum():
  return 'tarsum+sha256:' + __gen_hex_id(64)


def create_subtree(repo, structure, parent):
  num_nodes, subtrees, last_node_tags = structure

  # create the nodes
  for i in range(num_nodes):
    docker_image_id = __gen_hex_id()
    checksum = __gen_checksum()

    new_image = model.create_image(docker_image_id, repo)
    model.set_image_checksum(docker_image_id, repo, checksum)

    new_image = model.set_image_metadata(docker_image_id, repo.namespace,
                                         repo.name, str(datetime.now()),
                                         'no comment', parent)

    parent = new_image

  if last_node_tags:
    if not isinstance(last_node_tags, list):
      last_node_tags = [last_node_tags]

    for tag_name in last_node_tags:
      model.create_or_update_tag(repo.namespace, repo.name, tag_name,
                                 new_image.docker_image_id)

  for subtree in subtrees:
    create_subtree(repo, subtree, new_image)


def __generate_repository(user, name, description, is_public, permissions, structure):
  repo = model.create_repository(user.username, name, user)

  if is_public:
    model.set_repository_visibility(repo, 'public')

  if description:
    repo.description = description
    repo.save()

  for delegate, role in permissions:
    model.set_user_repo_permission(delegate.username, user.username, name,
                                   role)

  create_subtree(repo, structure, None)


if __name__ == '__main__':
  initialize_db()

  if app.config.get('POPULATE_DB_TEST_DATA', False):
    logger.debug('Populating the DB with test data.')

    new_user_1 = model.create_user('devtable', 'password',
                                   'jschorr@devtable.com')
    new_user_1.verified = True
    new_user_1.save()

    new_user_2 = model.create_user('public', 'password',
                                   'jacob.moshenko@gmail.com')
    new_user_2.verified = True
    new_user_2.save()

    __generate_repository(new_user_1, 'simple', 'Simple repository.', False,
                          [], (4, [], ['latest', 'prod']))

    __generate_repository(new_user_1, 'complex',
                          'Complex repository with many branches and tags.',
                          False, [(new_user_2, 'read')],
                          (2, [(3, [], 'v2.0'),
                               (1, [(1, [(1, [], ['latest', 'prod'])],
                                     'staging'),
                                    (1, [], None)], None)], None))

    __generate_repository(new_user_1, 'gargantuan', None, False, [],
                          (2, [(3, [], 'v2.0'),
                               (1, [(1, [(1, [], ['latest', 'prod'])],
                                     'staging'),
                                    (1, [], None)], None),
                               (20, [], 'v3.0'),
                               (5, [], 'v4.0'),
                               (1, [(1, [], 'v5.0'), (1, [], 'v6.0')], None)],
                           None))

    __generate_repository(new_user_2, 'publicrepo',
                          'Public repository pullable by the world.', True,
                          [], (10, [], 'latest'))

    __generate_repository(new_user_1, 'shared',
                          'Shared repository, another user can write.', False,
                          [(new_user_2, 'write')], (5, [], 'latest'))