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import logging

from functools import wraps

from time import time, mktime

from django.http import HttpResponse

from django.utils import simplejson as json

from astakos.im.api.faults import (

    Fault, Unauthorized, InternalServerError, BadRequest,

    Forbidden

)

from astakos.im.api import render_fault, _get_user_by_email, _get_user_by_username

from astakos.im.models import AstakosUser

from astakos.im.util import epoch

logger = logging.getLogger(__name__)

format = ('%a, %d %b %Y %H:%M:%S GMT')

def api_method(http_method=None, token_required=False, perms=None):

    """Decorator function for views that implement an API method."""

    if not perms:

        perms = []

    def decorator(func):

        @wraps(func)

        def wrapper(request, *args, **kwargs):

            try:

                if http_method and request.method != http_method:

                    raise BadRequest('Method not allowed.')

                x_auth_token = request.META.get('HTTP_X_AUTH_TOKEN')

                if token_required:

                    if not x_auth_token:

                        raise Unauthorized('Access denied')

                    try:

                        user = AstakosUser.objects.get(auth_token=x_auth_token)

                        if not user.has_perms(perms):

                            raise Forbidden('Unauthorized request')

                    except AstakosUser.DoesNotExist, e:

                        raise Unauthorized('Invalid X-Auth-Token')

                    kwargs['user'] = user

                response = func(request, *args, **kwargs)

                return response

            except Fault, fault:

                return render_fault(request, fault)

            except BaseException, e:

                logger.exception('Unexpected error: %s' % e)

                fault = InternalServerError('Unexpected error')

                return render_fault(request, fault)

        return wrapper

    return decorator

@api_method(http_method='GET', token_required=True)

def authenticate_old(request, user=None):

    # Normal Response Codes: 204

    # Error Response Codes: internalServerError (500)

    #                       badRequest (400)

    #                       unauthorised (401)

    if not user:

        raise BadRequest('No user')

    # Check if the is active.

    if not user.is_active:

        raise Unauthorized('User inactive')

    # Check if the token has expired.

    if (time() - mktime(user.auth_token_expires.timetuple())) > 0:

        raise Unauthorized('Authentication expired')

    if not user.signed_terms:

        raise Unauthorized('Pending approval terms')

    response = HttpResponse()

    response.status = 204

    user_info = {'username': user.username,

                 'uniq': user.email,

                 'auth_token': user.auth_token,

                 'auth_token_created': user.auth_token_created.isoformat(),

                 'auth_token_expires': user.auth_token_expires.isoformat(),

                 'has_credits': user.has_credits,

                 'has_signed_terms': user.signed_terms,

                 'groups': [g.name for g in user.groups.all()]}

    response.content = json.dumps(user_info)

    response['Content-Type'] = 'application/json; charset=UTF-8'

    response['Content-Length'] = len(response.content)

    return response

@api_method(http_method='GET', token_required=True)

def authenticate(request, user=None):

    # Normal Response Codes: 204

    # Error Response Codes: internalServerError (500)

    #                       badRequest (400)

    #                       unauthorised (401)

    if not user:

        raise BadRequest('No user')

    # Check if the is active.

    if not user.is_active:

        raise Unauthorized('User inactive')

    # Check if the token has expired.

    if (time() - mktime(user.auth_token_expires.timetuple())) > 0:

        raise Unauthorized('Authentication expired')

    if not user.signed_terms:

        raise Unauthorized('Pending approval terms')

    response = HttpResponse()

    response.status = 204

    user_info = {'userid': user.username,

                 'email': [user.email],

                 'name': user.realname,

                 'auth_token': user.auth_token,

                 'auth_token_created': epoch(user.auth_token_created),

                 'auth_token_expires': epoch(user.auth_token_expires),

                 'has_credits': user.has_credits,

                 'is_active': user.is_active,

                 'groups': [g.name for g in user.groups.all()]}

    response.content = json.dumps(user_info)

    response['Content-Type'] = 'application/json; charset=UTF-8'

    response['Content-Length'] = len(response.content)

    return response

@api_method(http_method='GET', token_required=True, perms=['im.can_access_userinfo'])

def get_user_by_email(request, user=None):

    # Normal Response Codes: 200

    # Error Response Codes: internalServerError (500)

    #                       badRequest (400)

    #                       unauthorised (401)

    #                       forbidden (403)

    #                       itemNotFound (404)

    email = request.GET.get('name')

    return _get_user_by_email(email)

@api_method(http_method='GET', token_required=True, perms=['im.can_access_userinfo'])

def get_user_by_username(request, user_id, user=None):

    # Normal Response Codes: 200

    # Error Response Codes: internalServerError (500)

    #                       badRequest (400)

    #                       unauthorised (401)

    #                       forbidden (403)

    #                       itemNotFound (404)

    return _get_user_by_username(user_id)