import subprocess
import os
import mailbox
import datetime

import pytz
from dateutil import parser as dateutilparser


def clean_data(config):
    open(config["top_mbox_file"], 'w').close()


    for top in config["pre_tops"]:
        if "file" in top and os.path.isfile(top["file"]):
            os.remove(top["file"])

    for top in config["post_tops"]:
        if "file" in top and os.path.isfile(top["file"]):
            os.remove(top["file"])

def read_db(config):
    subprocess.run(["helpers/read_db.sh"], check=True)

def read_topmails(config):
    in_mbox = mailbox.Maildir(config["top_inbox_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(config["last_date_file"]).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 config["top_list_id"] in generate.decode_header(message["List-Id"]).strip():
                date = dateutilparser.parse(message["Date"])
                if date > last_fsr_datetime:
                    buffer.append(message)

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

def compile_presentation(config):
    subprocess.run(["helpers/compile_presentation.sh"], check=True)