from datetime import datetime
from ..feedformatter import Feed
from .twitch import APIClient


def parse_iso(iso: str) -> datetime:
    return datetime.fromisoformat(iso.replace("Z", "+00:00"))


def construct_rss(client: APIClient, login: str) -> str:
    """
    Build a RSS stream for a Twitch user.

    :param client: Twitch API client
    :param login: user login
    :returns: RSS stream
    :raises HTTPException: if one of the requests fail
    :raises NoSuchUser: if the user does not exist
    """
    user_info = client.user(login)
    channel_id = user_info["id"]
    videos = client.videos(channel_id)
    stream = client.stream(channel_id)

    feed = Feed()
    user_url = f"https://www.twitch.tv/{user_info['login']}"

    # Set the feed/channel level properties
    feed.feed["title"] = user_info["display_name"]
    feed.feed["link"] = user_url
    feed.feed["author"] = "Twitch RSS Generated"
    feed.feed["description"] = user_info["description"]
    feed.feed["ttl"] = '10'

    if stream is not None:
        item = {}
        item["guid"] = stream["id"]
        item["title"] = "[⏺️ Live] " + stream.get("title", "Untitled Stream")
        item["link"] = user_url
        item["description"] = stream.get("game_name", "")
        item["pubDate"] = parse_iso(stream["started_at"]).timetuple()

        feed.items.append(item)

    for video in videos:
        if video.get("viewable", "public") != "public":
            continue

        item = {}

        if video.get("stream_id") is not None:
            if stream is not None and stream["id"] == video["stream_id"]:
                # Do not add a second item for the active stream
                continue

            item["guid"] = video["stream_id"]
        else:
            item["guid"] = video["id"]

        item["title"] = video.get("title", "Untitled Video")

        link = video.get("url", user_url)
        thumbnail = video["thumbnail_url"] \
            .replace("%{width}", "600") \
            .replace("%{height}", "400")

        item["link"] = link
        item["description"] = f'<a href="{link}"><img src="{thumbnail}" /></a>'
        item["pubDate"] = parse_iso(video["published_at"]).timetuple()

        feed.items.append(item)

    return feed.format_rss2_string()