from ..feedformatter import Feed
from ..util import parse_iso
from .youtube import APIClient


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:
        item = {}

        video_id = video["resourceId"]["videoId"]
        link = f"https://www.youtube.com/watch?v={video_id}"
        thumbnail = video["thumbnails"]["standard"]["url"]

        item["guid"] = video["resourceId"]["videoId"]
        item["title"] = video.get("title", "Untitled Video")
        item["link"] = link
        item["description"] = (
            f'<a href="{link}"><img src="{thumbnail}" /></a><br><br>'
            + video["description"]
        )
        item["pubDate"] = parse_iso(video["publishedAt"]).timetuple()

        feed.items.append(item)

    return feed.format_rss2_string()