'''
imap-mark-seen.py - Tool to mark all e-mails as seen

Copyright (c) 2012 Intra2net AG
Author: Plamen Dimitrov and Thomas Jarosch
'''
import logging
import argparse, getpass
from mail_iterator import MailIterator
from warnings_handler import WarningsHandler

# logging settings
LOG_FILENAME = "imap_mark_seen.log"
LOG_FILE_LEVEL = logging.DEBUG
LOG_SHELL_LEVEL = logging.INFO
LOG_UNCLEAN_EXIT_LEVEL = logging.WARNING

def main():
    """Main function."""

    # prepare configuration
    args = configure_args()
    warnings_handler = prepare_logger()
    logging.info("Marking messages as seen from %s of %s", args.folder, args.user)
    psw = getpass.getpass()

    # prepare simple mail iterator and iterate throug mailboxes
    session = MailIterator(args.server, args.user, psw)
    total_messages = 0
    for mailbox in session:
        if args.folder != "all folders" and ("INBOX/" + args.folder) not in mailbox[2]:
            continue
        try:
            mail_ids = session.fetch_messages()
        except UserWarning as ex:
            logging.error(ex)
            continue
        try:
            if len(mail_ids) > 0:
                mail_id_range = min(mail_ids, key=int).decode('iso-8859-1') + ':' + max(mail_ids, key=int).decode('iso-8859-1')
                session.set_seen_messages(mail_id_range)
                total_messages += len(mail_ids)
        except UserWarning as ex:
            logging.error(ex)

    logging.info("Finished marking %s messages as seen", total_messages)
    logging.info("Exiting with code %s", warnings_handler.detected_problems)
    return int(warnings_handler.detected_problems > 0)

def configure_args():
    """Configure arguments and return them."""

    # parse arguments
    parser = argparse.ArgumentParser(description="Tool to mark messages as seen.")
    parser.add_argument('-u', '--user', dest='user', action='store',
                        required=True, help='mark all messages as seen for a single user')
    parser.add_argument('-f', '--folder', dest='folder', action='store',
                        default="all folders", help='only mark given folder as seen')
    parser.add_argument('-s', '--server', dest='server', action='store',
                        default="localhost", help='imap server name with default localhost')    
    args = parser.parse_args()

    return args

def prepare_logger():
    """Sets up the logging functionality"""

    # reset the log
    with open(LOG_FILENAME, 'w'):
        pass

    # add basic configuration
    logging.basicConfig(filename=LOG_FILENAME,
                        format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
                        level=LOG_FILE_LEVEL)

    # add a handler for a console output
    default_logger = logging.getLogger('')
    console = logging.StreamHandler()
    console.setLevel(LOG_SHELL_LEVEL)
    formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    console.setFormatter(formatter)
    default_logger.addHandler(console)

    # add a handler for warnings counting
    warnings_handler = WarningsHandler()
    warnings_handler.setLevel(LOG_UNCLEAN_EXIT_LEVEL)
    default_logger.addHandler(warnings_handler)

    return warnings_handler

if __name__ == "__main__":
    main()