#!/usr/bin/python3
import mailbox
import jinja2
import email.header
import email.utils
import yaml
import datetime
import sys, os
import pypandoc
import argparse
import quopri
import pytz
from pprint import pprint
from dateutil import parser

MAILDIR = "/home/yannik/mail/INBOX.Mailinglisten.FSMI/"
CONFIG_FILE = "generator.conf"

def decode_header(header):
    decoded_header = email.header.decode_header(header)[0]
    encoding = decoded_header[1] or "ascii"
    if encoding == "unknown-8bit":
        encoding = "ascii"
    return decoded_header[0].decode(encoding, errors="replace") if isinstance(decoded_header[0], bytes) else decoded_header[0]

if __name__ == "__main__":
    config = yaml.full_load(open(CONFIG_FILE))
    in_mbox = mailbox.Maildir(MAILDIR)
    out_mbox = mailbox.mbox(config["top_mbox_file"])

    out_mbox.clear()

    buffer = []

    timezone = pytz.timezone("Europe/Berlin")
    last_fsr_date = datetime.date.fromisoformat(open("data/last_date").read().strip())
    last_fsr_datetime = datetime.datetime.combine(last_fsr_date, datetime.time(17, 30), timezone)

    for message in in_mbox:
        if message["List-Id"]:
            if "top.fsmi.uni-karlsruhe.de" in decode_header(message["List-Id"]).strip():
                date = parser.parse(message["Date"])
                if date > last_fsr_datetime:
                    buffer.append(message)

    for message in sorted(buffer, key=lambda x: parser.parse(x["Date"])):
        out_mbox.add(message)
    
    out_mbox.close()