import logging.config
import time

import features

from app import app, secscan_api, prometheus
from workers.worker import Worker
from data.database import UseThenDisconnect
from data.model.image import (get_images_eligible_for_scan, get_max_id_for_sec_scan,
                              get_min_id_for_sec_scan, get_image_id)
from util.secscan.api import SecurityConfigValidator
from util.secscan.analyzer import LayerAnalyzer
from util.migrate.allocator import yield_random_entries
from endpoints.v2 import v2_bp

BATCH_SIZE = 50
INDEXING_INTERVAL = 30

logger = logging.getLogger(__name__)
unscanned_images_gauge = prometheus.create_gauge('unscanned_images', 'Number of images that clair needs to scan.')
images_gauge = prometheus.create_gauge('all_images', 'Total number of images that clair can scan.')

class SecurityWorker(Worker):
  def __init__(self):
    super(SecurityWorker, self).__init__()
    validator = SecurityConfigValidator(app.config)
    if validator.valid():
      self._target_version = app.config.get('SECURITY_SCANNER_ENGINE_VERSION_TARGET', 2)
      self._analyzer = LayerAnalyzer(app.config, secscan_api)

      # Get the ID of the first image we want to analyze.
      self._min_id = get_min_id_for_sec_scan(self._target_version)

      self.add_operation(self._index_images, INDEXING_INTERVAL)
    else:
      logger.warning('Failed to validate security scan configuration')

  def _index_images(self):
    def batch_query():
      return get_images_eligible_for_scan(self._target_version)

    # Get the ID of the last image we can analyze. Will be None if there are no images in the
    # database.
    max_id = get_max_id_for_sec_scan()
    if max_id is None:
      return

    with UseThenDisconnect(app.config):
      for candidate, abt in yield_random_entries(batch_query, get_image_id(), BATCH_SIZE, max_id,
                                                 self._min_id):
        _, continue_batch = self._analyzer.analyze_recursively(candidate)
        if not continue_batch:
          logger.info('Another worker pre-empted us for layer: %s', candidate.id)
          abt.set()

    # If we reach this point, we analyzed every images up to max_id, next time the worker runs,
    # we want to start from the next image.
    self._min_id = max_id + 1

if __name__ == '__main__':
  app.register_blueprint(v2_bp, url_prefix='/v2')

  if not features.SECURITY_SCANNER:
    logger.debug('Security scanner disabled; skipping SecurityWorker')
    while True:
      time.sleep(100000)

  logging.config.fileConfig('conf/logging_debug.conf', disable_existing_loggers=False)
  worker = SecurityWorker()
  worker.start()