import json
import urllib
import json
import logging

from flask import request, make_response, jsonify, abort
from functools import wraps

from data import model
from app import app
from auth.auth import (process_auth, get_authenticated_user,
                       get_validated_token)
from util import parse_namespace_repository, parse_repository_name
from auth.permissions import (ModifyRepositoryPermission,
                              ReadRepositoryPermission, UserPermission)



logger = logging.getLogger(__name__)


REGISTRY_SERVER = 'localhost:5003'


def generate_headers(access):
  def add_headers(f):
    @wraps(f)
    def wrapper(namespace, repository, *args, **kwargs):
      response = f(namespace, repository, *args, **kwargs)

      response.headers['X-Docker-Endpoints'] = REGISTRY_SERVER

      has_token_request = request.headers.get('X-Docker-Token', '')

      if has_token_request and get_authenticated_user():
        repo = model.get_repository(namespace, repository)
        token = model.create_access_token(get_authenticated_user(), repo)
        token_str = ('Token signature=%s,repository="%s/%s",access=%s' %
                     (token.code, namespace, repository, access))
        response.headers['WWW-Authenticate'] = token_str
        response.headers['X-Docker-Token'] = token_str

      return response
    return wrapper
  return add_headers


@app.route('/v1/users', methods=['POST'])
@app.route('/v1/users/', methods=['POST'])
def create_user():
  user_data = request.get_json()
  model.create_user(user_data['username'], user_data['password'],
                    user_data['email'])
  return make_response('Created', 201)


@app.route('/v1/users', methods=['GET'])
@app.route('/v1/users/', methods=['GET'])
@process_auth
def get_user():
  if not get_authenticated_user():
    abort(401)

  return jsonify({
    'username': get_authenticated_user().username,
    'email': get_authenticated_user().email,
  })


@app.route('/v1/users/<username>/', methods=['PUT'])
@process_auth
def update_user(username):
  permission = UserPermission(username)

  if permission.can():
    update_request = request.get_json()

    if 'password' in update_request:
      logger.debug('Updating user password.')
      model.change_password(get_authenticated_user(),
                            update_request['password'])

    if 'email' in update_request:
      logger.debug('Updating user email')
      model.update_email(get_authenticated_user(), update_request['email'])

    return jsonify({
      'username': get_authenticated_user().username,
      'email': get_authenticated_user().email,
    })

  abort(403)


@app.route('/v1/repositories/<path:repository>', methods=['PUT'])
@process_auth
@parse_repository_name
@generate_headers(access='write')
def create_repository(namespace, repository):
  image_descriptions = json.loads(request.data)

  repo = model.get_repository(namespace, repository)

  if repo:
    permission = ModifyRepositoryPermission(namespace, repository)
    if not permission.can():
      if get_validated_token() or get_authenticated_user():
        abort(403)
      else:
        abort(401)
  else:
    if not get_authenticated_user():
      abort(401)

    if get_authenticated_user().username != namespace:
      abort(403)

    logger.debug('Creaing repository with owner: %s' %
                 get_authenticated_user().username)
    repo = model.create_repository(namespace, repository,
                                   get_authenticated_user())

  new_repo_images = {desc['id']: desc for desc in image_descriptions}
  added_images = dict(new_repo_images)
  for existing in model.get_repository_images(namespace, repository):
    if existing.image_id in new_repo_images:
      added_images.pop(existing.image_id)
    else:
      existing.repositoryimage.delete()

  for image_description in added_images.values():
    image = model.create_image(image_description['id'])
    model.assign_image_repository(repo, image, image_description['Tag'])

  response = make_response('Created', 201)
  return response


@app.route('/v1/repositories/<path:repository>/images', methods=['PUT'])
@process_auth
@parse_repository_name
@generate_headers(access='write')
def update_images(namespace, repository):
  permission = ModifyRepositoryPermission(namespace, repository)

  if permission.can():
    image_with_checksums = json.loads(request.data)

    for image in image_with_checksums:
      model.set_image_checksum(image['id'], image['checksum'])

    return make_response('Updated', 204)

  abort(403)


@app.route('/v1/repositories/<path:repository>/images', methods=['GET'])
@process_auth
@parse_repository_name
@generate_headers(access='read')
def get_repository_images(namespace, repository):
  permission = ReadRepositoryPermission(namespace, repository)

  # TODO invalidate token?

  if permission.can():
    all_images = []
    for image in model.get_repository_images(namespace, repository):
      new_image_view = {
        'id': image.image_id,
        'tag': image.repositoryimage.tag,
        'checksum': image.checksum,
      }
      all_images.append(new_image_view)

    resp = make_response(json.dumps(all_images), 200)
    resp.mimetype = 'application/json'

    return resp

  abort(403)


@app.route('/v1/repositories/<path:repository>/images', methods=['DELETE'])
@process_auth
@parse_repository_name
@generate_headers(access='delete')
def delete_repository_images(namespace, repository):
  pass


@app.route('/v1/repositories/<path:repository>/auth', methods=['PUT'])
@parse_repository_name
def put_repository_auth(namespace, repository):
  pass


@app.route('/v1/search', methods=['GET'])
def get_search():
  pass


@app.route('/_ping')
@app.route('/v1/_ping')
def ping():
  response = make_response('true', 200)
  response.headers['X-Docker-Registry-Version'] = '0.6.0'
  return response