#!/usr/bin/env python3
"""
URL parsing.
"""
import re
import html
from urllib.parse import urlparse

import requests

from module import hook, url_callback

HEADERS = {"User-Agent": "Give me your data.", "Range": "bytes=0-8192"}

@url_callback('puu.sh/')
def get_puush_fname(bot, url):
	"""
	Callback puu.sh links. Gets the filename and displays it.
	"""
	try:
		res = requests.head(url)
	except requests.exceptions.RequestException:
		return

	fname = res.headers.get('Content-Disposition', '')
	fname = re.search(r'\"(.*)\"', fname).group(1)
	if not fname:
		return

	bot.msg(f"[ \x0310puu.sh \x03] - \x0304{fname}")


@url_callback("youtube.com/watch")
@url_callback("youtu.be/")
def youtube_title(bot, url):
	"""
	Retrieve the title of the YouTube video and display it.
	"""
	url = "https://www.youtube.com/oembed?url=" + url
	res = requests.get(url)
	res.raise_for_status()

	title = res.json()['title']
	hostname = urlparse(url).hostname

	bot.msg(f"[ \x0310{title} \x03] - \x0304{hostname}")


@hook(True)
def title_auto(bot, trigger):
	"""
	Automatically show titles for URLs. For shortened URLs/redirects, find
	where the URL redirects to and show the title for that.
	"""
	if "http" not in ' '.join(trigger.args):
		return
	url_finder = re.compile(r"((?:http|https)(?::\/\/\S+))", re.IGNORECASE)

	urls = re.findall(url_finder, ' '.join(trigger.args))
	if len(urls) == 0:
		return

	for url in urls:
		url = url.replace('twitter.com', 'nitter.net')
		broken = False
		for key in bot.url_callbacks:
			if key in url:
				bot.url_callbacks[key](bot, url)
				broken = True
		if broken:
			continue
		try:
			res = requests.get(url, headers=HEADERS, verify=True, timeout=10)
		except (requests.exceptions.ConnectionError,
				requests.exceptions.ReadTimeout):
			continue
		try:
			res.raise_for_status()
		except:
			continue
		if not res.headers.get("Content-Type"):
			continue
		if not res.headers.get("Content-Type").startswith("text/html"):
			continue
		if res.text.find("<title") == -1:
			continue
		data = res.text[res.text.find("<title"):]
		data = re.sub("<title.*?>", "", data)
		title = data[:data.find("</title>")]
		title = html.unescape(title)
		title = title.replace("\n","").strip()
		hostname = urlparse(url).hostname
		bot.msg(f"[ \x0310{title} \x03] - \x0304{hostname}")