import uuid
from typing import Optional, Set

from apollo_notifications.utils import dump_datetime


# 'track in playlist' related events
def get_track_in_playlist_push_key(
        date: str,
        playlist_id: str,
        user_id: str,
        topic: str,
        market: Optional[str],
        vendor: str,
        isrc: str,
        delimiter="/",
        prefix="playlist") -> uuid.UUID:
    """Returns UUID from unique set of arguments, which is used as message id."""
    return uuid.uuid5(uuid.NAMESPACE_DNS, delimiter.join(
        [prefix, date, str(playlist_id), user_id, topic, market or '', vendor, isrc]))


def build_track_in_playlist_push_message(track: object, message_template: str, country_flag: str) -> str:
    """Builds push message from tracks data."""
    message = message_template.format(
        artist_name=track.artist_name,
        track_name=track.track_name,
        playlist_name=track.playlist_name,
        position=track.position,
        country_flag=country_flag
    )
    return message.strip()


def filter_track_in_playlist_event(
        item: object,
        date: str,
        topic: str,
        market: str,
        vendor: str,
        existing_messages: Set[str],
        *args, **kwargs):
    """Filter tracks to make push messages from."""
    return str(get_track_in_playlist_push_key(
        date, item.playlist_id, item.user_id, topic, market, vendor, item.isrc)
    ) not in existing_messages


# 'playlist' related events
def get_playlist_update_push_key(
    date: str,
    playlist_id: str,
    user_id: str,
    topic: str,
    market: Optional[str],
    vendor: str,
    delimiter="/",
    prefix=""
) -> uuid.UUID:
    """Returns UUID from unique set of arguments, which is used as message id."""
    return uuid.uuid5(uuid.NAMESPACE_DNS, delimiter.join(
        [prefix, date, str(playlist_id), user_id, topic, market or '', vendor]))


def build_playlist_update_push_message(playlist: object, message_template: str, country_flag: str) -> str:
    """Builds push message from playlist data."""
    message = message_template.format(
        playlist_name=playlist.playlist_name,
        country_flag=country_flag
    )
    return message.strip()


def filter_playlist_update_event(
    item: object,
    topic: str,
    market: Optional[str],
    vendor: str,
    existing_messages: Set[str],
    *args, **kwargs
) -> bool:
    """Filter playlists to make push messages from."""
    return str(
        get_playlist_update_push_key(
            dump_datetime(item.date),
            item.playlist_id,
            item.user_id,
            topic,
            market,
            vendor
        )
    ) not in existing_messages