import requests
from .models import FacebookPage, FacebookReview

BASE_URL = 'https://graph.facebook.com'


RECOMMENDATION_STR2NUM = {'negative': False, 'positive': True}


def get_page_reviews(page_id):
    token = FacebookPage.objects.get(id=page_id).token
    url = f'{BASE_URL}/{page_id}/ratings?fields=open_graph_story&limit=25&access_token={token}'
    response = requests.get(url).json()

    # ratings has one field ['data'] which contain all reviews
    data = response.get('data')
    return data


def store_reviews_into_db(page_id):
    reviews = get_page_reviews(page_id=page_id)
    for review in reviews:
        graph_story = review.get('open_graph_story')
        '''
        >>> graph_story.keys()
            dict_keys(['id', 'message', 'start_time', 'type', 'data'])
        '''
        review_id = graph_story.get('id')
        message = graph_story.get('message')
        start_time = graph_story.get('start_time')
        recommendation_type = RECOMMENDATION_STR2NUM[graph_story.get('data')['recommendation_type']]

        review, created = FacebookReview.objects.update_or_create(
            id=review_id,
            recommendation_type=recommendation_type,
            review_text=message,
            create_time=start_time,
            page_id=page_id
        )
        if created:
            print(f'New Facebook review has been created at {page_id}!')


def populate_facebook_reviews():
    page_ids = FacebookPage.objects.values('id')
    for page_id in page_ids:
        store_reviews_into_db(page_id=page_id.get('id'))