UnTube/backend/charts/views.py

import bleach
from django.db.models import Count, Q
from django.http import JsonResponse


def channel_videos_distribution(request, playlist_id):
    labels = []
    data = []

    playlist_items = request.user.playlists.get(playlist_id=bleach.clean(playlist_id)).playlist_items.all()

    queryset = playlist_items.filter(Q(video__is_unavailable_on_yt=False) &
                                     Q(video__was_deleted_on_yt=False))\
        .values('video__channel_name').annotate(channel_videos_count=Count('video_position'))

    for entry in queryset:
        labels.append(entry['video__channel_name'])
        data.append(entry['channel_videos_count'])

    return JsonResponse(data={
        'labels': labels,
        'data': data,
    })


def overall_channels_distribution(request):
    labels = []
    data = []

    videos = request.user.videos.filter(Q(is_unavailable_on_yt=False) & Q(was_deleted_on_yt=False))

    queryset = videos.values('channel_name').annotate(channel_videos_count=Count('video_id')
                                                      ).order_by('-channel_videos_count')[:100]

    for entry in queryset:
        labels.append(entry['channel_name'])
        data.append(entry['channel_videos_count'])

    return JsonResponse(data={
        'labels': labels,
        'data': data,
    })


def overall_playlists_distribution(request):
    labels = []
    data = []

    user_playlists = request.user.playlists.filter(is_in_db=True).exclude(playlist_id='LL')
    total_num_playlists = user_playlists.count()

    statistics = {'public': 0, 'private': 0, 'favorites': 0, 'watching': 0, 'imported': 0, 'youtube mixes': 0}

    if total_num_playlists != 0:
        statistics['public'] = user_playlists.filter(is_private_on_yt=False).count()
        statistics['private'] = user_playlists.filter(is_private_on_yt=True).count()
        statistics['favorites'] = user_playlists.filter(is_favorite=True).count()
        statistics['watching'] = user_playlists.filter(marked_as='watching').count()
        statistics['imported'] = user_playlists.filter(is_user_owned=False).count()
        statistics['youtube mixes'] = user_playlists.filter(is_yt_mix=True).count()

    for key, value in statistics.items():
        labels.append(key)
        data.append(value)

    return JsonResponse(data={
        'labels': labels,
        'data': data,
    })


def watching_playlists_percent_distribution(request):
    labels = []
    data = []

    watching_playlists = request.user.playlists.filter(Q(is_in_db=True) & Q(marked_as='watching'))

    if watching_playlists.exists():
        for playlist in watching_playlists:
            labels.append(playlist.name)
            data.append(playlist.get_percent_complete())

    return JsonResponse(data={
        'labels': labels,
        'data': data,
    })