#!/usr/bin/env python3
#
# lcmail-wizard - Script for mail (and log) auto deletion
#
# Actions:
#   * Create new mail dir structure if new entries are added
#     inside lcmail-wizard.yml, but not delete mail dir
#     if entries are removed from lcmail-wizard.yml
#   * Read lcmail-wizard.yml file parsing auto del rules,
#     and procede with deletion (mail and log)
#
# See README for more information
#

import argparse
import datetime
import logging
import os

import yaml

# Default envs
BASE = os.path.abspath(os.path.dirname(__file__))
CONF = os.path.join(BASE, "lcmail-wizard.yml")
HOME = os.environ["HOME"]
LOGDIR = os.path.join(BASE, "log/")
MAILDIR = os.path.join(HOME, ".maildir")
PROCMAIL = os.path.join(HOME, ".procmail")
TRASH = os.path.join(MAILDIR, ".Trash/cur")

# Log configuration
logging.basicConfig(
    filename=LOGDIR + "lcmail-wizard.log." + datetime.date.today().strftime("%y-%m-%d"),
    filemode="a",
    level=logging.DEBUG,
    format="%(asctime)s - %(levelname)s: %(message)s",
)

# Argparse configuration
parser = argparse.ArgumentParser(
    description="lcmail-wizard.py - Script for mail (and log) auto deletion",
    formatter_class=argparse.RawDescriptionHelpFormatter,
)
parser.add_argument(
    "-c",
    "--create",
    help="update maildir structure (creation only)",
    action="store_true",
    default=False,
)
parser.add_argument(
    "-d", "--debug", help="no action, only logging", action="store_true", default=False
)
args = parser.parse_args()


def pconf():
    """ Parse yaml configuration file """
    try:
        with open(CONF, "r") as fsi:
            try:
                conf = yaml.load(fsi)
                return conf
            except BaseException:
                logging.exception("%s not loaded", CONF)
    except FileNotFoundError:
        logging.exception("%s not found", CONF)


def cdate(filename):
    """ Return creation datetime """
    time = os.path.getctime(filename)
    return datetime.datetime.fromtimestamp(time)


def ddate(filename):
    """ Return difference between creation date and nowdate in days """
    return abs((datetime.datetime.now() - cdate(filename)).days)


def mkdir_maildir(debug):
    """ Update mail directories (only creation update for safe) """
    types = pconf()
    for type in types:
        if type == "mail":
            dirs = types[type]
            for dir in dirs:
                if debug:
                    if os.path.exists(os.path.join(MAILDIR, dir)):
                        pass
                    else:
                        logging.debug(
                            "%s folder structure created", os.path.join(MAILDIR, dir)
                        )
                else:
                    if os.path.exists(os.path.join(MAILDIR, dir)):
                        pass
                    else:
                        os.makedirs(os.path.join(MAILDIR, dir), mode=0o700)
                        os.makedirs(os.path.join(MAILDIR, dir, "cur"), mode=0o700)
                        os.makedirs(os.path.join(MAILDIR, dir, "new"), mode=0o700)
                        os.makedirs(os.path.join(MAILDIR, dir, "tmp"), mode=0o700)
                        logging.info(
                            "%s folder structure created", os.path.join(MAILDIR, dir)
                        )


def empty_mail_log(debug):
    """ Empty logs and mails """
    types = pconf()
    for type in types:
        if type == "mail":
            dirs = types[type]
            for dir in dirs:
                if dirs[dir] != 0:
                    os.chdir(os.path.join(MAILDIR, dir, "cur"))
                    for mail in os.listdir("."):
                        if ddate(mail) >= dirs[dir]:
                            if debug:
                                logging.debug(
                                    "%s in %s with ddate %s conf %s to delete",
                                    mail,
                                    dir,
                                    ddate(mail),
                                    dirs[dir],
                                )
                            else:
                                os.rename(mail, os.path.join(TRASH, mail))
                                logging.info("%s in %s deleted", mail, dir)
        elif type == "log":
            dirs = types[type]
            for dir in dirs:
                if dir == "procmail":
                    if dirs[dir] != 0:
                        os.chdir(os.path.join(PROCMAIL, "log"))
                        for log in os.listdir("."):
                            if ddate(log) >= dirs[dir]:
                                if debug:
                                    logging.debug(
                                        "%s in %s/log with ddate %s conf %s to delete",
                                        log,
                                        dir,
                                        ddate(log),
                                        dirs[dir],
                                    )
                                else:
                                    os.remove(log)
                                    logging.info("%s in %s/log deleted", log, dir)
                elif dir == "lcmail":
                    if dirs[dir] != 0:
                        os.chdir(os.path.join(LOGDIR))
                        for log in os.listdir("."):
                            if ddate(log) >= dirs[dir]:
                                if debug:
                                    logging.debug(
                                        "%s in %s/log with ddate %s conf %s to delete",
                                        log,
                                        dir,
                                        ddate(log),
                                        dirs[dir],
                                    )
                                else:
                                    os.remove(log)
                                    logging.info("%s in %s/log deleted", log, dir)
                else:
                    pass
        else:
            pass


if __name__ == "__main__":
    try:
        if args.create:
            mkdir_maildir(args.debug)
        else:
            empty_mail_log(args.debug)
    except BaseException:
        logging.exception("General exception occured")