import datetime
import re

import humanize
# given amount of seconds makes it into this 54 MINUTES AND 53 SECONDS (from humanize) then
# perform a bunch of replace operations to make it look like 54mins. 53secs.
import pytz


def getHumanizedTimeString(seconds):
    return humanize.precisedelta(
        datetime.timedelta(seconds=seconds)).upper(). \
        replace(' month'.upper(), 'm.').replace(' months'.upper(), 'm.').replace(' days'.upper(), 'd.').replace(
        ' day'.upper(), 'd.').replace(' hours'.upper(), 'hrs.').replace(' hour'.upper(), 'hr.').replace(
        ' minutes'.upper(), 'mins.').replace(' minute'.upper(), 'min.').replace(
        'and'.upper(), '').replace(' seconds'.upper(), 'secs.').replace(' second'.upper(), 'sec.').replace(',', '')


# input => ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', ..., '100']  <- array of 100 video ids
# output => ['1,2,3,4,...,50', '51,52,53,...,100']  <- array of 2 video id strings, each with upto 50 comma sperated video ids
def getVideoIdsStrings(video_ids):
    output = []

    i = 0
    while i < len(video_ids):
        output.append(','.join(video_ids[i:i + 50]))
        i += 50

    return output


# input: array of youtube video duration strings => ['24M23S', '2H2M2S', ...]
# output:integer => seconds
def calculateDuration(vid_durations):
    hours_pattern = re.compile(r'(\d+)H')
    minutes_pattern = re.compile(r'(\d+)M')
    seconds_pattern = re.compile(r'(\d+)S')

    total_seconds = 0
    for duration in vid_durations:
        hours = hours_pattern.search(duration)  # returns matches in the form '24H'
        mins = minutes_pattern.search(duration)  # '24M'
        secs = seconds_pattern.search(duration)  # '24S'

        hours = int(hours.group(1)) if hours else 0  # returns 24
        mins = int(mins.group(1)) if mins else 0
        secs = int(secs.group(1)) if secs else 0

        video_seconds = datetime.timedelta(hours=hours, minutes=mins, seconds=secs).total_seconds()

        total_seconds += video_seconds

    return total_seconds


def getThumbnailURL(thumbnails):
    priority = ('maxres', 'standard', 'high', 'medium', 'default')

    for quality in priority:
        if quality in thumbnails:
            return thumbnails[quality]['url']

    return ''


# generates a message in the form of '1 / 19 watched! 31mins. 15secs. left to go!'
def generateWatchingMessage(playlist):
    """
    This is the message that will be seen when a playlist is set to watching.
    Takes in the playlist object and calculates the watch time left by looping over unwatched video
    and using their durations
    """
    pass


def getVideoId(video_link):
    """
    takes in a valid video link and returns a video id
    """
    if '?' not in video_link:
        return video_link

    temp = video_link.split('?')[-1].split('&')

    for el in temp:
        if 'v=' in el:
            return el.split('v=')[-1]


def increment_tag_views(playlist_tags):
    """
    Increments playlist tag overall views and views per week. If its been a week, views per week is reset to
    zero.
    """
    for tag in playlist_tags:
        # reset tag views if its been a week
        if tag.last_views_reset + datetime.timedelta(days=7) < datetime.datetime.now(pytz.utc):
            tag.times_viewed_per_week = 0
            tag.last_views_reset = datetime.datetime.now(pytz.utc)
        else:
            tag.times_viewed_per_week += 1
        tag.times_viewed += 1
        tag.save(update_fields=['times_viewed', 'last_views_reset', 'times_viewed_per_week'])