from django.utils.dateparse import parse_datetime
from datetime import timedelta

from django.conf import settings
import logging
import requests

from oauth.oauth_client import oauth
from users.licenses import MYSKILLBOX_LICENSES, is_myskillbox_product, TEACHER_KEY
from users.models import License

logger = logging.getLogger(__name__)

class HepClientException(Exception):
    pass


class HepClientUnauthorizedException(Exception):
    pass


class HepClientNoTokenException(Exception):
    pass


class HepClient:

    def _call(self, url, request, token, method='get', data=None):

        token_parameters = {
            'token': token,
            'request': request
        }

        if method == 'post':
            response = oauth.hep.post(url, json=data, **token_parameters)
        elif method == 'get':
            response = oauth.hep.get(url, params=data, **token_parameters)
        elif method == 'put':
            response = oauth.hep.put(url, data=data, **token_parameters)

        if response.status_code == 401:
            raise HepClientUnauthorizedException(response.status_code, response.json())
        elif response.status_code != 200:
            raise HepClientException(response.status_code, response.json())

        return response

    def is_email_verified(self, user_data):
        return user_data['email_verified_at'] is not None

    def user_details(self, request=None, token=None):
        self._has_credentials(request, token)
        response = self._call('api/auth/user', request, token)
        return response.json()['data']

    def logout(self, request=None, token=None):
        self._has_credentials(request, token)
        self._call('api/auth/logout', request, token, method='post')
        return True

    def fetch_eorders(self, request=None, token=None):
        self._has_credentials(request, token)
        data = {
          'filters[product_type]': 'eLehrmittel',
        }
        response = self._call('api/partners/users/orders/search', request, token, data=data)
        return response.json()['data']


        # return [
        #     {
        #         "id": 5,
        #         "status": "paid",
        #         "order_total": 10000,
        #         "created_at": "2021-05-10T20:52:16.000000Z",
        #         "billing_address": {
        #             "id": 20,
        #             "salutation": "male",
        #             "first_name": "Hans",
        #             "last_name": "Meier",
        #             "company": "Lustig GmbH",
        #             "street": "Sulgenrain 12890",
        #             "city": "Bern",
        #             "post_code": "3007",
        #             "country": "Schweiz"
        #         },
        #         "delivery_address": {
        #             "id": 19,
        #             "salutation": "male",
        #             "first_name": "Hans",
        #             "last_name": "Muster",
        #             "company": "Muster AG",
        #             "street": "Ruderweg 24",
        #             "city": "Bern",
        #             "post_code": "3000",
        #             "country": "Schweiz"
        #         },
        #         "entries": [
        #             {
        #                 "id": 3433,
        #                 "uri": "\/products\/myskillbox-lernende",
        #                 "url": None,
        #                 "title": "mySkillbox für Lernende ",
        #                 "subtitle": "Lizenz gültig für 4 Jahre",
        #                 "isbn": "978-3-0355-1397-4",
        #                 "slug": "myskillbox-lernende",
        #                 "product_type": "eLehrmittel",
        #                 "product_form": "",
        #                 "cover": "https:\/\/hep-verlag.fra1.digitaloceanspaces.com\/staging\/products\/2921\/978-3-0355-1397-4.jpg",
        #                 "price": 100,
        #                 "price_total": 100,
        #                 "amount": 1,
        #                 "authors": []
        #             }
        #         ]
        #     }
        # ]

    def active_myskillbox_product_for_customer(self, request=None, token=None):
        eorders = self.fetch_eorders(request=request, token=token)
        myskillbox_products = self._extract_myskillbox_products(eorders)

        if len(myskillbox_products) == 0:
            return None
        else:
            return self._get_active_product(myskillbox_products)

    def _has_credentials(self, request, token):
        if request is None and token is None:
            raise HepClientNoTokenException

    def redeem_coupon(self, coupon_code, customer_id, request=None, token=None):
        self._has_credentials(request, token)
        try:
            response = self._call(f'api/partners/users/{customer_id}/coupons/redeem', request, token, method='post',
                                  data={'code': coupon_code})
        except HepClientException:
            return None

        response_data = response.json()

        # todo handle 404, 402

        return response_data

    def _extract_myskillbox_products(self, eorders):
        products = []

        for eorder in eorders:

            status = eorder.get('status', '')

            for entry in eorder['entries']:
                product = self.entry_to_product(entry, self._get_item_activation(eorder), status)

                if product:
                    products.append(product)

        return products

    def entry_to_product(self, entry, activation_date, status):
        if is_myskillbox_product(entry['isbn']) and activation_date:
            return {
                        'raw': entry,
                        'activated': activation_date,
                        'status': status,
                        'order_id': entry['id'],
                        'license': MYSKILLBOX_LICENSES[entry['isbn']],
                        'isbn': entry['isbn']
                    }

        return None

    def _get_item_activation(self, eorder):
        if 'created_at' in eorder:
            return parse_datetime(eorder['created_at'])
        else:
            return None

    def _get_active_product(self, products):

        def filter_valid_products(product):

            if product['status'] not in ['paid', 'new']:
                return False

            expiry_delta = product['activated'] + timedelta(product['license']['duration'])

            return License.is_product_active(expiry_delta, product['isbn'])

        active_products = list(filter(filter_valid_products, products))

        if len(active_products) == 0:
            return None
        elif len(active_products) == 1:
            return active_products[0]
        else:
            return self._select_from_teacher_products(active_products)

    def _select_from_teacher_products(self, active_products):

        # select first teacher product, as they are all valid it does not matter which one
        for product in active_products:
            if product['license']['edition'] == TEACHER_KEY:
                return product

        # select a student product, as they are all valid it does not matter which one
        return active_products[0]