import logging
import json

from flask import Blueprint, request, make_response
from flask.ext.restful import Resource, abort, Api, reqparse
from flask.ext.restful.utils.cors import crossdomain
from calendar import timegm
from email.utils import formatdate
from functools import partial, wraps
from jsonschema import validate, ValidationError

from data import model
from util.names import parse_namespace_repository
from auth.permissions import (ReadRepositoryPermission,
                              ModifyRepositoryPermission,
                              AdministerRepositoryPermission)
from auth import scopes
from auth.auth_context import get_authenticated_user
from auth.auth import process_oauth


logger = logging.getLogger(__name__)
api_bp = Blueprint('api', __name__)
api = Api(api_bp)
api.decorators = [process_oauth,
                  crossdomain(origin='*', headers=['Authorization', 'Content-Type'])]


def resource(*urls, **kwargs):
  def wrapper(api_resource):
    api.add_resource(api_resource, *urls, **kwargs)
    return api_resource
  return wrapper


def truthy_bool(param):
  return param not in {False, 'false', 'False', '0', 'FALSE', '', 'null'}


def format_date(date):
  """ Output an RFC822 date format. """
  return formatdate(timegm(date.utctimetuple()))


def add_method_metadata(name, value):
  def modifier(func):
    if '__api_metadata' not in dir(func):
      func.__api_metadata = {}
    func.__api_metadata[name] = value
    return func
  return modifier


def method_metadata(func, name):
  if '__api_metadata' in dir(func):
    return func.__api_metadata.get(name, None)
  return None


nickname = partial(add_method_metadata, 'nickname')
internal_api = add_method_metadata('internal_api', True)


def query_param(name, help_str, type=reqparse.text_type, default=None,
                choices=(), required=False):
  def add_param(func):
    if '__api_query_params' not in dir(func):
      func.__api_query_params = []
    func.__api_query_params.append({
      'name': name,
      'type': type,
      'help': help_str,
      'default': default,
      'choices': choices,
      'required': required,
    })
    return func
  return add_param


def parse_args(func):
  @wraps(func)
  def wrapper(self, *args, **kwargs):
    if '__api_query_params' not in dir(func):
      abort(400)

    parser = reqparse.RequestParser()
    for arg_spec in func.__api_query_params:
      parser.add_argument(**arg_spec)
    parsed_args = parser.parse_args()

    return func(self, parsed_args, *args, **kwargs)
  return wrapper


def parse_repository_name(func):
  @wraps(func)
  def wrapper(repository, *args, **kwargs):
    (namespace, repository) = parse_namespace_repository(repository)
    return func(namespace, repository, *args, **kwargs)
  return wrapper


class ApiResource(Resource):
  def options(self):
    return None, 200


class RepositoryParamResource(ApiResource):
  method_decorators = [parse_repository_name]


def require_repo_permission(permission_class, scope, allow_public=False):
  def wrapper(func):
    @add_method_metadata('oauth2_scope', scope)
    @wraps(func)
    def wrapped(self, namespace, repository, *args, **kwargs):
      logger.debug('Checking permission %s for repo: %s/%s', permission_class, namespace,
                   repository)
      permission = permission_class(namespace, repository)
      if (permission.can() or
          (allow_public and
           model.repository_is_public(namespace, repository))):
        return func(self, namespace, repository, *args, **kwargs)
      abort(403)
    return wrapped
  return wrapper


require_repo_read = require_repo_permission(ReadRepositoryPermission, scopes.READ_REPO, True)
require_repo_write = require_repo_permission(ModifyRepositoryPermission, scopes.WRITE_REPO)
require_repo_admin = require_repo_permission(AdministerRepositoryPermission, scopes.ADMIN_REPO)


def require_scope(scope_object):
  def wrapper(func):
    @add_method_metadata('oauth2_scope', scope_object['scope'])
    @wraps(func)
    def wrapped(*args, **kwargs):
      return func(*args, **kwargs)
    return wrapped
  return wrapper


def validate_json_request(schema_name):
  def wrapper(func):
    @add_method_metadata('request_schema', schema_name)
    @wraps(func)
    def wrapped(self, *args, **kwargs):
      schema = self.schemas[schema_name]
      try:
        validate(request.get_json(), schema)
        return func(self, *args, **kwargs)
      except ValidationError as ex:
        abort(400, message=ex.message)
    return wrapped
  return wrapper


def request_error(exception=None, **kwargs):
  data = kwargs.copy()
  if exception:
    data['message'] = exception.message

  return json.dumps(data), 400


def log_action(kind, user_or_orgname, metadata={}, repo=None):
  performer = get_authenticated_user()
  model.log_action(kind, user_or_orgname, performer=performer, ip=request.remote_addr,
                   metadata=metadata, repository=repo)


import endpoints.api.legacy

import endpoints.api.repository
import endpoints.api.discovery
import endpoints.api.user
import endpoints.api.search
import endpoints.api.build
import endpoints.api.webhook