from datetime import datetime, timedelta, time

from django.core.cache import caches
from django.conf import settings
from django.db.models import Count, Q, Sum
from django.shortcuts import render
from django.utils import timezone

from queues.models import PlaylistSong
from songs.models import Song
from marietje.models import User


def recache_stats():
    new_stats = compute_stats()
    caches['default'].delete('stats')
    caches['default'].set('stats', new_stats, 2 * 3600)
    return new_stats
    
def recache_user_stats():
    users = User.objects.exclude(Q(id=None)
        | Q(id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).values('id')
    for user in users:
        new_stats = user_stats(user['id'])
        cacheloc = 'userstats_{}'.format(user['id'])
        caches['userstats'].delete(cacheloc)
        caches['userstats'].set(cacheloc, new_stats, 48 * 3600)
    return new_stats

def time_convert(time):
    for tr in time:
        tr['duration'] = str(round(tr['total'] / 86400, 2)) + ' days'
        avg_dur_sec = tr['avg_dur']%60
        avg_dur_min = int((tr['avg_dur']-avg_dur_sec)/60)
        tr['avg_dur'] = '{}:{}'.format(avg_dur_min, avg_dur_sec)
    return time

def compute_stats():
    # We want to grab the time now, because otherwise we would be reporting a minute too late
    last_updated = datetime.now()

    total_uploads = Song.objects.filter(deleted=False).exclude(
        user_id=None).count()

    upload_stats = Song.objects.filter(deleted=False).exclude(
        user_id=None).values(
            'user__id', 'user__name').annotate(total=Count('id')).order_by(
                '-total', 'user__name')[:settings.STATS_TOP_COUNT]

    total_requests = PlaylistSong.objects.filter(state=2).exclude(
        Q(user_id=None)
        | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).count()

    request_stats = PlaylistSong.objects.filter(state=2).exclude(
        Q(user_id=None)
        | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).values(
            'user__id', 'user__name').annotate(total=Count('id')).order_by(
                '-total', 'user__name')[:settings.STATS_TOP_COUNT]

    unique_request_stats = PlaylistSong.objects.filter(state=2).exclude(
        Q(user_id=None)
        | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).values(
            'user__id', 'user__name').annotate(
                total_requests=Count('id', distinct=True),
                unique_requests=Count('song__id', distinct=True)).order_by(
                    '-unique_requests')[:settings.STATS_TOP_COUNT]

    total_unique_requests = PlaylistSong.objects.filter(state=2).exclude(
        Q(user_id=None)
        | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).aggregate(
            total=Count('song__id', distinct=True))

    most_played_songs = PlaylistSong.objects.filter(state=2).exclude(
        Q(user_id=None)
        | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).values(
            'song__artist',
            'song__title').annotate(total=Count('id')).order_by(
                '-total', 'song__artist')[:settings.STATS_TOP_COUNT]

    most_played_songs_14_days = PlaylistSong.objects.filter(
        state=2, played_at__gte=timezone.now() -
        timedelta(days=14)).exclude(user_id=None).values(
            'song__artist',
            'song__title').annotate(total=Count('id')).order_by(
                '-total', 'song__artist')[:settings.STATS_TOP_COUNT]                

    time_requested = PlaylistSong.objects.filter(state=2).exclude(
        Q(user_id=None)
        | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).values(
            'user__id', 'user__name').annotate(total=Sum('song__duration'), avg_dur=Sum('song__duration')/Count('id')).order_by(
                '-total')[:settings.STATS_TOP_COUNT]

    total_time_requested = PlaylistSong.objects.all().filter(state=2).exclude(
        Q(user_id=None)
        | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).aggregate(
            total=Sum('song__duration'))

    most_requested_uploaders = PlaylistSong.objects.filter(state=2).exclude(
        Q(user_id=None)
        | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).values(
            'song__user__id', 'song__user__name').annotate(total=Count(
                'song__user__id')).order_by('-total')[:settings.STATS_TOP_COUNT]

    return {
        'last_updated': last_updated,
        'total_uploads': total_uploads,
        'upload_stats': list(upload_stats),
        'total_requests': total_requests,
        'request_stats': list(request_stats),
        'unique_request_stats': list(unique_request_stats),
        'total_unique_requests': total_unique_requests,
        'most_played_songs': list(most_played_songs),
        'most_played_songs_14_days': list(most_played_songs_14_days),
        'time_requested': time_convert(list(time_requested)),
        'total_time_requested': str(round(float(total_time_requested['total']) / 86400, 2)) + ' days',
        'stats_top_count': settings.STATS_TOP_COUNT,
        'most_requested_uploaders': list(most_requested_uploaders),
    }

def user_stats(request):
    last_updated = datetime.now()

    total_uploads = Song.objects.filter(
        user__id=request, deleted=False).count()

    total_requests = PlaylistSong.objects.filter(
        user__id=request, state=2).count()

    unique_requests = PlaylistSong.objects.filter(
        user__id=request, state=2,
        song_id__isnull=False).values('song_id').distinct().count()

    most_played_songs = PlaylistSong.objects.filter(
        user__id=request, state=2).exclude(
            Q(user_id=None)
            | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).values(
                'song__artist',
                'song__title').annotate(total=Count('id')).order_by(
                    '-total', 'song__artist',
                    'song__title')[:settings.STATS_TOP_COUNT]

    most_played_uploaders = PlaylistSong.objects.filter(
        user__id=request, state=2).exclude(
            Q(user_id=None)
            | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).values(
                'song__user__id', 'song__user__name').annotate(
                    total=Count('song__user__id')).order_by(
                        '-total')[:settings.STATS_TOP_COUNT]

    most_played_uploads = PlaylistSong.objects.filter(
        state=2, song_id__in=Song.objects.filter(user__id=request)).exclude(user__id=None).values(
                    'song__artist',
                    'song__title').annotate(total=Count('id', filter=~Q(user__id=request)), user_total=Count('id', filter=Q(user__id=request))).order_by(
                        '-total', 'song__artist',
                        'song__title')[:settings.STATS_TOP_COUNT]

    most_played = list(most_played_uploads)
    total_played_uploads = 0
    total_played_user_uploads = 0
    for x in most_played:
        total_played_uploads += x['total']
        total_played_user_uploads += x['user_total']

    return {
        'last_updated': last_updated,
        'total_uploads': total_uploads,
        'total_requests': total_requests,
        'unique_requests': unique_requests,
        'most_played_songs': list(most_played_songs),
        'most_played_uploaders': list(most_played_uploaders),
        'most_played_uploads': list(most_played_uploads),
        'stats_top_count': settings.STATS_TOP_COUNT,
        'total_played_uploads': total_played_uploads,
        'total_played_user_uploads': total_played_user_uploads,
    }