import dateutil.parser
import requests
import xml.etree.ElementTree as ET
from tools.converters import *
from tools.extractors import extract_yt_initial_data
from cachetools import TTLCache

channel_cache = TTLCache(maxsize=50, ttl=300)

def extract_channel(ucid):
	if ucid in channel_cache:
		return channel_cache[ucid]

	channel_type = "channel" if len(ucid) == 24 and ucid[:2] == "UC" else "user"
	with requests.get("https://www.youtube.com/{}/{}/videos".format(channel_type, ucid)) as r:
		r.raise_for_status()
		yt_initial_data = extract_yt_initial_data(r.content.decode("utf8"))
		header = yt_initial_data["header"]["c4TabbedHeaderRenderer"]
		author = header["title"]
		author_id = header["channelId"]
		author_url = header["navigationEndpoint"]["commandMetadata"]["webCommandMetadata"]["url"]
		author_banners = []
		if "banner" in header:
			author_banners = header["banner"]["thumbnails"]
			for t in author_banners:
				t["url"] = normalise_url_protocol(t["url"])
		author_thumbnails = []
		if "avatar" in header:
			author_thumbnails = generate_full_author_thumbnails(header["avatar"]["thumbnails"])
		subscriber_count = combine_runs(header["subscriberCountText"])
		description = yt_initial_data["metadata"]["channelMetadataRenderer"]["description"]
		allowed_regions = yt_initial_data["metadata"]["channelMetadataRenderer"]["availableCountryCodes"]
		tabs = yt_initial_data["contents"]["twoColumnBrowseResultsRenderer"]["tabs"]
		videos_tab = next(tab["tabRenderer"] for tab in tabs if tab["tabRenderer"]["title"] == "Videos")
		videos = (
			v["gridVideoRenderer"] for v in
			videos_tab["content"]["sectionListRenderer"]["contents"][0]["itemSectionRenderer"]["contents"][0]["gridRenderer"]["items"]
		)
		latest_videos = []
		for v in videos:
			live = True
			length_text = "LIVE"
			length_seconds = -1
			for o in v["thumbnailOverlays"]:
				if "thumbnailOverlayTimeStatusRenderer" in o:
					length_text = combine_runs(o["thumbnailOverlayTimeStatusRenderer"]["text"])
					if o["thumbnailOverlayTimeStatusRenderer"]["style"] != "LIVE":
						length_seconds = length_text_to_seconds(length_text)
						live = False
			published = 0
			published_text = "Live now"
			if "publishedTimeText" in v:
				published_text = v["publishedTimeText"]["simpleText"]
				published = past_text_to_time(published_text)
			latest_videos.append({
				"type": "video",
				"title": combine_runs(v["title"]),
				"videoId": v["videoId"],
				"author": author,
				"authorId": author_id,
				"authorUrl": author_url,
				"videoThumbnails": generate_video_thumbnails(v["videoId"]),
				"description": "",
				"descriptionHtml": "",
				"viewCount": view_count_text_to_number(combine_runs(v["viewCountText"])),
				"second__viewCountText": combine_runs(v["viewCountText"]),
				"second__viewCountTextShort": combine_runs(v["shortViewCountText"]),
				"published": published,
				"publishedText": published_text,
				"lengthSeconds": length_seconds,
				"second__lengthText": length_text,
				"liveNow": live,
				"paid": None,
				"premium": None,
				"isUpcoming": None
			})

		channel = {
			"author": author,
			"authorId": author_id,
			"authorUrl": author_url,
			"authorBanners": author_banners,
			"authorThumbnails": author_thumbnails,
			"subCount": uncompress_counter(subscriber_count.split(" ")[0]),
			"second__subCountText": subscriber_count,
			"totalViews": None,
			"joined": None,
			"paid": None,
			"autoGenerated": None,
			"isFamilyFriendly": None,
			"description": description,
			"descriptionHtml": add_html_links(escape_html_textcontent(description)),
			"allowedRegions": allowed_regions,
			"latestVideos": latest_videos,
			"relatedChannels": []
		}

		channel_cache[ucid] = channel

		return channel

def extract_channel_videos(ucid):
	channel = extract_channel(ucid)
	if "error" in channel:
		return channel
	else:
		return channel["latestVideos"]

def extract_channel_latest(ucid):
	with requests.get("https://www.youtube.com/feeds/videos.xml?channel_id={}".format(ucid)) as r:
		r.raise_for_status()
		feed = ET.fromstring(r.content)
		author_container = feed.find("{http://www.w3.org/2005/Atom}author")
		author = author_container.find("{http://www.w3.org/2005/Atom}name").text
		author_url = author_container.find("{http://www.w3.org/2005/Atom}uri").text
		channel_id = feed.find("{http://www.youtube.com/xml/schemas/2015}channelId").text
		results = []
		for entry in feed.findall("{http://www.w3.org/2005/Atom}entry"):
			id = entry.find("{http://www.youtube.com/xml/schemas/2015}videoId").text
			media_group = entry.find("{http://search.yahoo.com/mrss/}group")
			description = media_group.find("{http://search.yahoo.com/mrss/}description").text
			media_community = media_group.find("{http://search.yahoo.com/mrss/}community")
			results.append({
				"type": "video",
				"title": entry.find("{http://www.w3.org/2005/Atom}title").text,
				"videoId": id,
				"author": author,
				"authorId": channel_id,
				"authorUrl": author_url,
				"videoThumbnails": generate_video_thumbnails(id),
				"description": description,
				"descriptionHtml": add_html_links(escape_html_textcontent(description)),
				"viewCount": int(media_community.find("{http://search.yahoo.com/mrss/}statistics").attrib["views"]),
				"published": int(dateutil.parser.isoparse(entry.find("{http://www.w3.org/2005/Atom}published").text).timestamp()),
				"lengthSeconds": None,
				"liveNow": None,
				"paid": None,
				"premium": None,
				"isUpcoming": None
			})
		return results