"""
Functionality:
- initiate celery app
- collect tasks
"""

import os

from celery import Celery, shared_task
from home.src.config import AppConfig
from home.src.download import ChannelSubscription, PendingList, VideoDownloader
from home.src.helper import get_lock
from home.src.index_management import backup_all_indexes, restore_from_backup
from home.src.reindex import ManualImport, reindex_old_documents

CONFIG = AppConfig().config
REDIS_HOST = CONFIG["application"]["REDIS_HOST"]

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "home.settings")
app = Celery("tasks", broker="redis://" + REDIS_HOST)
app.config_from_object("django.conf:settings", namespace="CELERY")
app.autodiscover_tasks()


@shared_task
def update_subscribed():
    """look for missing videos and add to pending"""
    channel_handler = ChannelSubscription()
    missing_videos = channel_handler.find_missing()
    if missing_videos:
        pending_handler = PendingList()
        pending_handler.add_to_pending(missing_videos)
    # check if reindex is needed
    check_reindex.delay()


@shared_task
def download_pending():
    """download latest pending videos"""
    pending_handler = PendingList()
    pending_vids = pending_handler.get_all_pending()[0]
    to_download = [i["youtube_id"] for i in pending_vids]
    to_download.reverse()
    if to_download:
        download_handler = VideoDownloader(to_download)
        download_handler.download_list()


@shared_task
def download_single(youtube_id):
    """start download single video now"""
    download_handler = VideoDownloader([youtube_id])
    download_handler.download_list()


@shared_task
def extrac_dl(youtube_ids):
    """parse list passed and add to pending"""
    pending_handler = PendingList()
    missing_videos = pending_handler.parse_url_list(youtube_ids)
    pending_handler.add_to_pending(missing_videos)


@shared_task
def check_reindex():
    """run the reindex main command"""
    reindex_old_documents()


@shared_task
def run_manual_import():
    """called from settings page, to go through import folder"""

    print("starting media file import")
    have_lock = False
    my_lock = get_lock("manual_import")

    try:
        have_lock = my_lock.acquire(blocking=False)
        if have_lock:
            import_handler = ManualImport()
            if import_handler.identified:
                import_handler.process_import()
        else:
            print("Did not acquire lock form import.")

    finally:
        if have_lock:
            my_lock.release()


@shared_task
def run_backup():
    """called from settings page, dump backup to zip file"""
    backup_all_indexes()
    print("backup finished")


@shared_task
def run_restore_backup():
    """called from settings page, dump backup to zip file"""
    restore_from_backup()
    print("index restore finished")