from collections import Counter
from concurrent.futures import ThreadPoolExecutor, as_completed
import csv
import functools

from imdb_utils import IMDbUtils
from bookstack import Bookstack


JACKNET_WIKI_URL = "https://wiki.jacknet.io"

# Page ID of https://wiki.jacknet.io/books/vcinema/page/csv
CSV_PAGE_ID = 11

def get_viewings_csv_attachment_id(token_id, token_secret):
    attachments = Bookstack.get_attachments(JACKNET_WIKI_URL, token_id, token_secret)

    viewings_csv_file_name = "vcinema.csv"

    return next((x['id'] for x in attachments if x['uploaded_to'] == CSV_PAGE_ID and x['name'] == viewings_csv_file_name), None)


def get_vcinema_viewings(token_id, token_secret, viewings_csv=None, combine_repeat_viewings=True):
    if viewings_csv is None:
        attachment_id = get_viewings_csv_attachment_id(token_id, token_secret)
        viewings_csv = Bookstack.get_attachment(JACKNET_WIKI_URL, token_id, token_secret, attachment_id)

    viewings_csv = viewings_csv.decode("utf-8")
    viewings_csv_rows = viewings_csv.strip().split("\n")

    viewings = list(csv.DictReader(viewings_csv_rows, quotechar='"'))

    if combine_repeat_viewings:
        for viewing in viewings:
            viewing['viewings'] = [
                {'date_watched': viewing['date_watched'], 'season': viewing['season'], 'rating': viewing['rating']}]
            viewing.pop('date_watched')
            viewing.pop('season')
            viewing.pop('rating')

        watch_counts = Counter([x['imdb_id'] for x in viewings])
        repeat_watches = [k for k, v in watch_counts.items() if v > 1]

        for film in repeat_watches:
            viewing_indexes = [index for index, viewing in enumerate(viewings) if viewing['imdb_id'] == film]

            first_watch = viewings[viewing_indexes[0]]

            for index in viewing_indexes[1::]:
                first_watch['viewings'].extend(viewings[index]['viewings'])

            for index in reversed(viewing_indexes[1::]):
                viewings.pop(index)

    return viewings


def increment_progressbar(bar, _):
    bar.next()


def add_imdb_data_to_viewings(viewings, field_names, progressbar=None):
    with ThreadPoolExecutor(4) as executor:
        future_imdb_tasks = {executor.submit(IMDbUtils.get_movie, viewing['imdb_id']) for viewing in viewings}

        if progressbar is not None:
            for this_future in future_imdb_tasks:
                this_future.add_done_callback(functools.partial(increment_progressbar, progressbar))

        for future in as_completed(future_imdb_tasks):
            imdb_data = future.result()

            for viewing in viewings:
                if viewing['imdb_id'] == imdb_data.movieID:
                    for field_name in field_names:
                        if field_name in imdb_data:
                            viewing[field_name] = imdb_data[field_name]

        if progressbar is not None:
            progressbar.finish()


def filter_viewings(viewings, filter_field, progressbar=None):
    viewings_filtered = {}

    for viewing in viewings:
        if filter_field in viewing:
            viewing_field = viewing[filter_field]
            if isinstance(viewing_field, list):
                for fve in list(viewing_field):
                    if fve in viewings_filtered.keys():
                        viewings_filtered[fve] += [viewing]
                    else:
                        viewings_filtered[fve] = [viewing]
            else:
                if viewing_field in viewings_filtered.keys():
                    viewings_filtered[viewing_field] += [viewing]
                else:
                    viewings_filtered[viewing_field] = [viewing]

        if progressbar is not None:
            progressbar.next()

    return viewings_filtered