import os
import xml.etree.ElementTree as ET
import requests
from datetime import datetime, timezone

FEED = 'https://discuss.32bit.cafe/all/new.atom'
FILENAME = os.path.basename(FEED)
WEBHOOK = 'https://discord.com/api/webhooks/1152044037017186417/igGNMxiVhLSW9y4kL8cs7y6m0AutxqXHxMTWSXWN0jbCUnsxLT_er8pqWQKoAjGpPywg'


def tag(tagname: str) -> str:
    el_prefix = '{http://www.w3.org/2005/Atom}'
    return el_prefix + tagname


class Entry:
    def __init__(self, entry):
        self.title = entry.find(tag('title')).text
        self.url = entry.find(tag('id')).text
        self.author = entry.find(tag('author')).find(tag('name')).text
        self.date = datetime.fromisoformat(entry.find(tag('published')).text)

    def __str__(self):
        return f'{self.title} by {self.author} at {self.date} \n {self.url}'


def get_last_update_time():
    try:
        stat = os.stat(FILENAME)
        return datetime.fromtimestamp(stat.st_mtime,
                                      datetime.now().astimezone().tzinfo)
    except FileNotFoundError:
        return datetime.now(timezone.utc)


def update_rss_file():
    r = requests.get(FEED, stream=True)
    with open(FILENAME, 'w') as fd:
        for chunk in r.iter_content(chunk_size=1024, decode_unicode=True):
            fd.write(chunk)


def parse_rss_file():
    tree = ET.parse(FILENAME)
    return tree.getroot()


def get_new_posts(time, root):
    posts = []
    for entry in root.findall(tag('entry')):
        e = Entry(entry)
        print(e.date)
        if e.date > time:
            posts.append(e)
    return posts


def send_message(entry):
    obj = {
            'content': str(entry)
            }
    r = requests.post(WEBHOOK, obj)
    print(r.status_code)

# Check last mod date of current rss file
# Download new version of file
# Iterate over entries, storing ones with a newer date in an array
# send POST to discord webhook


if __name__ == "__main__":
    last_updated = get_last_update_time()
    print(last_updated)
    update_rss_file()
    root = parse_rss_file()
    posts = get_new_posts(last_updated, root)
    print(posts)
    for post in posts:
        send_message(post)