import appdirs
import argparse
import logging
import os
import pathlib
import sys

from configparser import ConfigParser
from getpass import getpass

from api import StandardNotesAPI
from sn_fuse import StandardNotesFUSE
from fuse import FUSE

OFFICIAL_SERVER_URL = 'https://sync.standardnotes.org'
APP_NAME = 'standardnotes-fs'
logging.basicConfig(level=logging.DEBUG)

# path settings
cfg_env = os.environ.get('SN_FS_CONFIG_PATH')
CONFIG_PATH = cfg_env if cfg_env else appdirs.user_config_dir(APP_NAME)
CONFIG_FILE = pathlib.PurePath(CONFIG_PATH, APP_NAME + '.conf')

def parse_options():
    parser = argparse.ArgumentParser(formatter_class=argparse.RawTextHelpFormatter)
    parser.add_argument('mountpoint', nargs='?', help='local mountpoint folder')
    parser.add_argument('--username',
                        help='Standard Notes username to log in with')
    parser.add_argument('--password',
                        help='Standard Notes password to log in with\n'
                             'NOTE: It is NOT recommended to use this! The\n'
                             '      password may be stored in history, so\n'
                             '      use the password prompt instead.')
    parser.add_argument('--sync-url',
                        help='URL of Standard File sync server. Defaults to:\n'
                        ''+OFFICIAL_SERVER_URL)
    parser.add_argument('--no-config-file', action='store_true',
                        help='don\'t load or create a config file')
    parser.add_argument('--config',
                        help='specify a config file location. Defaults to:\n'
                        ''+str(CONFIG_FILE))
    parser.add_argument('--logout', action='store_true',
                        help='delete login credentials saved in config and quit')
    return parser.parse_args()

def main():
    args = parse_options()
    config = ConfigParser()
    keys = {}

    config_file = args.config if args.config else CONFIG_FILE
    config_file = pathlib.Path(config_file)

    # logout and quit if wanted
    if args.logout:
        try:
            config_file.unlink()
            print('Config file deleted.')
        except OSError:
            print('Already logged out.')
        sys.exit(0)

    # make sure mountpoint is specified
    if not args.mountpoint:
        logging.critical('No mountpoint specified.')
        sys.exit(1)

    # load config file settings
    if not args.no_config_file:
        try:
            config_file.parent.mkdir(mode=0o0700, parents=True, exist_ok=True)
        except OSError:
            err_msg = 'Error creating directory "%s".'
            logging.critical(err_msg % str(config_file.parent))
            sys.exit(1)

        try:
            with config_file.open() as f:
                config.read_file(f)
        except OSError:
            err_msg = 'Unable to read config file "%s".'
            logging.info(err_msg % str(config_file))

    # figure out all login params
    if args.sync_url:
        sync_url = args.sync_url
    elif config.has_option('user', 'sync_url'):
        sync_url = config.get('user', 'sync_url')
    else:
        sync_url = OFFICIAL_SERVER_URL

    if config.has_option('user', 'username') \
        and config.has_section('keys') \
        and not args.username \
        and not args.password:
            username = config.get('user', 'username')
            keys = dict(config.items('keys'))
    else:
        username = args.username if args.username else \
                   input('Please enter your Standard Notes username: ')
        password = args.password if args.password else \
                   getpass('Please enter your password (hidden): ')

    # log the user in
    try:
        sn_api = StandardNotesAPI(sync_url, username)
        if not keys:
            keys = sn_api.genKeys(password)
        sn_api.signIn(keys)
        login_success = True
    except:
        err_msg = 'Failed to log into account "%s".'
        logging.critical(err_msg % username)
        login_success = False

    if login_success:
        fuse = FUSE(StandardNotesFUSE(sn_api), args.mountpoint, foreground=True, nothreads=True)

    # write settings back if good, clear if not
    if not args.no_config_file:
        config.read_dict(dict(user=dict(sync_url=sync_url, username=username),
                              keys=keys))
        try:
            with config_file.open(mode='w+') as f:
                if login_success:
                    config.write(f)
        except OSError:
            err_msg = 'Unable to write config file "%s".'
            logging.error(err_msg % str(config_file))

if __name__ == '__main__':
    main()