#!/usr/bin/env python
from __future__ import print_function

import os
import sys
from optparse import OptionParser

from six.moves.configparser import ConfigParser

sys.path.insert(1, os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir, 'lib')))

import galaxy.config
from galaxy.model.util import pgcalc
from galaxy.objectstore import build_object_store_from_config
from galaxy.util import nice_size


default_config = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir, 'config/galaxy.ini'))

parser = OptionParser()
parser.add_option('-c', '--config', dest='config', help='Path to Galaxy config file (config/galaxy.ini)', default=default_config)
parser.add_option('-u', '--username', dest='username', help='Username of user to update', default='all')
parser.add_option('-e', '--email', dest='email', help='Email address of user to update', default='all')
parser.add_option('--dry-run', dest='dryrun', help='Dry run (show changes but do not save to database)', action='store_true', default=False)
(options, args) = parser.parse_args()


def init():
    options.config = os.path.abspath(options.config)
    if options.username == 'all':
        options.username = None
    if options.email == 'all':
        options.email = None

    config_parser = ConfigParser(dict(here=os.getcwd(),
                                      database_connection='sqlite:///database/universe.sqlite?isolation_level=IMMEDIATE'))
    config_parser.read(options.config)

    config_dict = {}
    for key, value in config_parser.items("app:main"):
        config_dict[key] = value

    config = galaxy.config.Configuration(**config_dict)
    object_store = build_object_store_from_config(config)

    from galaxy.model import mapping

    return (mapping.init(config.file_path, config.database_connection, create_tables=False, object_store=object_store),
            object_store,
            config.database_connection.split(':')[0])


def quotacheck(sa_session, users, engine):
    sa_session.refresh(user)
    current = user.get_disk_usage()
    print(user.username, '<' + user.email + '>:', end=' ')
    if engine not in ('postgres', 'postgresql'):
        new = user.calculate_disk_usage()
        sa_session.refresh(user)
        # usage changed while calculating, do it again
        if user.get_disk_usage() != current:
            print('usage changed while calculating, trying again...')
            return quotacheck(sa_session, user, engine)
    else:
        new = pgcalc(sa_session, user.id, dryrun=options.dryrun)
    # yes, still a small race condition between here and the flush
    print('old usage:', nice_size(current), 'change:', end=' ')
    if new in (current, None):
        print('none')
    else:
        if new > current:
            print('+%s' % (nice_size(new - current)))
        else:
            print('-%s' % (nice_size(current - new)))
        if not options.dryrun and engine not in ('postgres', 'postgresql'):
            user.set_disk_usage(new)
            sa_session.add(user)
            sa_session.flush()


if __name__ == '__main__':
    print('Loading Galaxy model...')
    model, object_store, engine = init()
    sa_session = model.context.current

    if not options.username and not options.email:
        user_count = sa_session.query(model.User).count()
        print('Processing %i users...' % user_count)
        for i, user in enumerate(sa_session.query(model.User).enable_eagerloads(False).yield_per(1000)):
            print('%3i%%' % int(float(i) / user_count * 100), end=' ')
            quotacheck(sa_session, user, engine)
        print('100% complete')
        object_store.shutdown()
        sys.exit(0)
    elif options.username:
        user = sa_session.query(model.User).enable_eagerloads(False).filter_by(username=options.username).first()
    elif options.email:
        user = sa_session.query(model.User).enable_eagerloads(False).filter_by(email=options.email).first()
    if not user:
        print('User not found')
        sys.exit(1)
    object_store.shutdown()
    quotacheck(sa_session, user, engine)