import logging
import json

from flask import abort, request, jsonify, make_response, session

from app import storage
from auth.decorators import process_auth
from auth.permissions import (ReadRepositoryPermission, ModifyRepositoryPermission)
from data.registry_model import registry_model
from data.registry_model.manifestbuilder import lookup_manifest_builder
from endpoints.decorators import anon_protect, parse_repository_name
from endpoints.v1 import v1_bp
from util.audit import track_and_log
from util.names import TAG_ERROR, TAG_REGEX

logger = logging.getLogger(__name__)


@v1_bp.route('/repositories/<repopath:repository>/tags', methods=['GET'])
@process_auth
@anon_protect
@parse_repository_name()
def get_tags(namespace_name, repo_name):
  permission = ReadRepositoryPermission(namespace_name, repo_name)
  repository_ref = registry_model.lookup_repository(namespace_name, repo_name, kind_filter='image')
  if permission.can() or (repository_ref is not None and repository_ref.is_public):
    if repository_ref is None:
      abort(404)

    tags = registry_model.list_repository_tags(repository_ref, include_legacy_images=True)
    tag_map = {tag.name: tag.legacy_image.docker_image_id for tag in tags}
    return jsonify(tag_map)

  abort(403)


@v1_bp.route('/repositories/<repopath:repository>/tags/<tag>', methods=['GET'])
@process_auth
@anon_protect
@parse_repository_name()
def get_tag(namespace_name, repo_name, tag):
  permission = ReadRepositoryPermission(namespace_name, repo_name)
  repository_ref = registry_model.lookup_repository(namespace_name, repo_name, kind_filter='image')
  if permission.can() or (repository_ref is not None and repository_ref.is_public):
    if repository_ref is None:
      abort(404)

    tag = registry_model.get_repo_tag(repository_ref, tag, include_legacy_image=True)
    if tag is None:
      abort(404)

    resp = make_response('"%s"' % tag.legacy_image.docker_image_id)
    resp.headers['Content-Type'] = 'application/json'
    return resp

  abort(403)


@v1_bp.route('/repositories/<repopath:repository>/tags/<tag>', methods=['PUT'])
@process_auth
@anon_protect
@parse_repository_name()
def put_tag(namespace_name, repo_name, tag):
  permission = ModifyRepositoryPermission(namespace_name, repo_name)
  repository_ref = registry_model.lookup_repository(namespace_name, repo_name, kind_filter='image')

  if permission.can() and repository_ref is not None:
    if not TAG_REGEX.match(tag):
      abort(400, TAG_ERROR)

    image_id = json.loads(request.data)

    # Check for the image ID first in a builder (for an in-progress push).
    builder = lookup_manifest_builder(repository_ref, session.get('manifest_builder'), storage)
    if builder is not None:
      layer = builder.lookup_layer(image_id)
      if layer is not None:
        commited_tag = builder.commit_tag_and_manifest(tag, layer)
        if commited_tag is None:
          abort(400)

        return make_response('Created', 200)

    # Check if there is an existing image we should use (for PUT calls outside of a normal push
    # operation).
    legacy_image = registry_model.get_legacy_image(repository_ref, image_id)
    if legacy_image is None:
      abort(400)

    if registry_model.retarget_tag(repository_ref, tag, legacy_image, storage) is None:
      abort(400)

    return make_response('Created', 200)

  abort(403)


@v1_bp.route('/repositories/<repopath:repository>/tags/<tag>', methods=['DELETE'])
@process_auth
@anon_protect
@parse_repository_name()
def delete_tag(namespace_name, repo_name, tag):
  permission = ModifyRepositoryPermission(namespace_name, repo_name)
  repository_ref = registry_model.lookup_repository(namespace_name, repo_name, kind_filter='image')

  if permission.can() and repository_ref is not None:
    if not registry_model.delete_tag(repository_ref, tag):
      abort(404)

    track_and_log('delete_tag', repository_ref, tag=tag)
    return make_response('Deleted', 200)

  abort(403)