import sys
import html
import shlex
from xml.etree import ElementTree
from urllib.request import urlopen, Request
from urllib.parse import urlparse, urlunparse, urljoin

def find_ignore_ns(element, tag):
    for i in element.iter():
        if i.tag == tag:
            return i
        if i.tag in ('item', 'entry') or i.tag.endswith('}item') or i.tag.endswith('}entry'):
            break
    for i in element.iter():
        if i.tag.endswith('}' + tag):
            return i
        if i.tag in ('item', 'entry') or i.tag.endswith('}item') or i.tag.endswith('}entry'):
            break

is_link = lambda i: i.attrib.get('rel') != 'self' and i.attrib.get('type', 'text/html') == 'text/html'

def find_link(element):
    for i in element.iter():
        if i.tag == 'link' and is_link(i):
            return i
        if i.tag in ('item', 'entry') or i.tag.endswith('}item') or i.tag.endswith('}entry'):
            break
    for i in element.iter():
        if i.tag.endswith('}link') and is_link(i):
            return i
        if i.tag in ('item', 'entry') or i.tag.endswith('}item') or i.tag.endswith('}entry'):
            break

with open(sys.argv[1]) as file, open(sys.argv[2], 'w+') as out:
    for i in file:
        inp = shlex.split(i, comments=True)
        if 'blog' in inp[1:]:
            feedurl = inp[0]
            try:
                with urlopen(Request(feedurl, headers={'User-Agent': "stop being so fucking obsessed that i'm using urllib ffs"}), timeout=60) as resp:
                    if resp.status != 200:
                        print(feedurl, 'returned', resp.status, file=sys.stderr)
                        continue
                    tree = ElementTree.ElementTree().parse(resp)
            except Exception as e:
                print(feedurl, 'raised', e, file=sys.stderr)
                continue
            if tree.tag not in ('rss', 'feed') and not tree.tag.endswith('}rss') and not tree.tag.endswith('}feed'):
                print(f'{feedurl} is not a feed (root tag is {tree.tag})', file=sys.stderr)
                continue
            channel = find_ignore_ns(tree, 'channel')
            if channel is None:
                channel = tree
            if find_ignore_ns(channel, 'item') is None and find_ignore_ns(channel, 'entry') is None:
                print(feedurl, 'has no entries, skipping', file=sys.stderr)
                continue
            url = find_link(channel)
            if url is None:
                url = list(urlparse(feedurl))
                url[2] = ''
                url = urlunparse(url)
                print(f'No mention of main page on {feedurl}, please see {url} or enter main page url: ', file=sys.stderr, end='', flush=True)
                url = input().strip() or url
            else:
                url = url.text or url.attrib['href']
            text = f'<li><b><a href="{html.escape(urljoin(feedurl, url))}">{html.escape(find_ignore_ns(channel, "title").text)}</a> (<a href="{html.escape(feedurl)}">feed</a>)'
            desc = find_ignore_ns(channel, 'description')
            if desc is not None and desc.text:
                if desc := desc.text.strip():
                    text += f':</b> {html.escape(desc)}'
                else:
                    text += '</b>'
            else:
                desc = find_ignore_ns(channel, 'subtitle')
                if desc is not None and desc.text:
                    if desc := desc.text.strip():
                        text += f':</b> {html.escape(desc)}'
                    else:
                        text += '</b>'
                else:
                    text += '</b>'
            print(text, '</li>', sep='')
            out.write(text)
            out.write('</li>\n')
    out.flush()