import logging
import json

from data.database import Image, ImageStorage, Repository
from data import model
from app import app

import boto.s3.connection
import boto.s3.key


store = app.config['STORAGE']
logger = logging.getLogger(__name__)
logging.basicConfig(level=logging.DEBUG)

# Turn off debug logging for boto
logging.getLogger('boto').setLevel(logging.CRITICAL)


query = (Image
  .select(Image, ImageStorage, Repository)
  .join(ImageStorage)
  .switch(Image)
  .join(Repository))


bad_count = 0
good_count = 0

s3_conn = boto.s3.connection.S3Connection(app.config['AWS_ACCESS_KEY'],
                                          app.config['AWS_SECRET_KEY'])
s3_bucket = s3_conn.get_bucket('quay-registry')

PATHS = [
  store.image_json_path,
  store.image_checksum_path,
  store.image_layer_path,
  store.image_ancestry_path,
  store.image_file_trie_path,
  store.image_file_diffs_path,
]

def resolve_or_create(repo, docker_image_id, new_ancestry):
  existing = model.get_repo_image(repo.namespace, repo.name, docker_image_id)
  if existing:
    logger.debug('Found existing image: %s, %s', existing.id, docker_image_id)
    return existing
  else:
    # we need to find some storage to link it to
    try:
      to_link = (ImageStorage
        .select()
        .join(Image)
        .where(Image.docker_image_id == docker_image_id)
        .get())
      logger.debug('Linking to storage: %s' % to_link.uuid)
      created = Image.create(docker_image_id=docker_image_id, repository=repo,
                             storage=to_link, ancestors=new_ancestry)
      logger.debug('Created image: %s' % created)
      return created
    except ImageStorage.DoesNotExist:
      logger.warning('No storage for ancestor, tring to find it anywhere: %s',
                     docker_image_id)
      try:
        found = Image.get(docker_image_id=docker_image_id)
        logger.debug('Found some legacy storage for docker_image_id: %s',
                     docker_image_id)
        new_storage = ImageStorage.create(checksum=found.checksum,
                                          created=found.created,
                                          comment=found.comment,
                                          command=found.command,
                                          image_size=found.image_size)

        logger.debug('Migrating data to new storage: %s' % new_storage.uuid)

        for path in PATHS:
          old_path = path(found.repository.namespace, found.repository.name,
                          docker_image_id, None)
          new_path = path(None, None, None, new_storage.uuid)
          logger.debug('Copying %s -> %s', old_path, new_path)

          old_path_key = s3_bucket.get_key(old_path)
          old_path_key.copy('quay-registry', new_path, encrypt_key=True,
                            validate_dst_bucket=False)

        logger.debug('Creating new image from copied legacy storage: %s',
                     new_storage.uuid)
        created = Image.create(docker_image_id=docker_image_id,
                               repository=repo,
                               storage=new_storage, ancestors=new_ancestry)
        logger.debug('Created image: %s' % created)
        return created

      except Image.DoesNotExist:
        msg = 'No image available anywhere for storage: %s in namespace: %s'
        logger.error(msg, docker_image_id, repo.namespace)
        raise RuntimeError()


def all_ancestors_exist(ancestors):
  if not ancestors:
    return True

  found_count = len(list(Image
    .select()
    .where(Image.id << ancestors)))
  return found_count == len(ancestors)


cant_fix = []
for img in query:
  try:
    uuid = img.storage.uuid
    ancestry_storage = store.image_ancestry_path(img.repository.namespace,
                                                 img.repository.name,
                                                 img.docker_image_id,
                                                 uuid)
    if store.exists(ancestry_storage):
      full_ancestry = json.loads(store.get_content(ancestry_storage))[1:]
      full_ancestry.reverse()

      ancestor_dbids = [int(anc_id) 
                        for anc_id in img.ancestors.split('/')[1:-1]]

      if len(full_ancestry) != len(ancestor_dbids) or not all_ancestors_exist(ancestor_dbids):
        logger.error('Image has incomplete ancestry: %s, %s, %s, %s' %
                     (img.id, img.docker_image_id, full_ancestry,
                      ancestor_dbids))

        fixed_ancestry = '/'
        for ancestor in full_ancestry:
          ancestor_img = resolve_or_create(img.repository, ancestor,
                                           fixed_ancestry)
          fixed_ancestry += str(ancestor_img.id) + '/'

        img.ancestors = fixed_ancestry
        img.save()

        bad_count += 1
      else:
        good_count += 1

  except RuntimeError:
    cant_fix.append(img)

  logger.debug('Bad: %s Good: %s Can\'t Fix: %s', bad_count, good_count,
               len(cant_fix))

for cant in cant_fix:
  logger.error('Unable to fix %s in repo %s/%s', cant.id,
               cant.repository.namespace, cant.repository.name)