from datetime import timedelta
from ..feedformatter import Feed
from .youtube import APIClient


# Minimum duration for videos to be listed in the feed
MINIMUM_DURATION = timedelta(seconds=70)


def construct_rss(client: APIClient, channel_id: str) -> str:
    """
    Build a RSS stream for a YouTube channel.

    :param client: YouTube API client
    :param channel_id: channel ID
    :returns: RSS stream
    :raises HTTPException: if one of the requests fail
    :raises NoSuchChannel: if the channel does not exist
    """
    channel_info = client.channel(channel_id)
    videos = client.playlist(channel_info["playlist"])

    feed = Feed()
    channel_url = f"https://www.youtube.com/channel/{channel_id}"

    # Set the feed/channel level properties
    feed.feed["title"] = channel_info["title"]
    feed.feed["link"] = channel_url
    feed.feed["author"] = "Feedleware"
    feed.feed["description"] = channel_info["description"]
    feed.feed["ttl"] = "30"

    for video in videos:
        if video["duration"] >= MINIMUM_DURATION:
            feed.items.append({
                "guid": video["id"],
                "title": video["title"],
                "link": video["url"],
                "description": (
                    f'<a href="{video["url"]}"><img src="{video["thumbnail"]}" /></a><br><br>'
                    + video["description"]
                ),
                "pubDate": video["published"].timetuple(),
            })

    return feed.format_rss2_string()