#!/usr/bin/env python
# -*- coding: utf-8

import sys
import argparse

import anvio.db as db
import anvio.utils as utils
import anvio.terminal as terminal

from anvio.errors import ConfigError


run = terminal.Run()
progress = terminal.Progress()

current_version = '4'
next_version    = '5'


def migrate(db_path):
    if db_path is None:
        raise ConfigError("No database path is given.")

    # make sure someone is not being funny
    utils.is_pan_db(db_path)

    # make sure the version is accurate
    pan_db = db.DB(db_path, None, ignore_version = True)
    if str(pan_db.get_version()) != current_version:
        raise ConfigError("Version of this pan database is not %s (hence, this script cannot really do anything)." % current_version)

    progress.new("Trying to upgrade the pan database")
    progress.update('...')

    pan_db.set_meta_value('description', '_No description is found_')

    # set the version
    pan_db.remove_meta_key_value_pair('version')
    pan_db.set_version(next_version)

    # bye
    pan_db.disconnect()
    progress.end()

    run.info_single('Your pan db is now %s.' % next_version, nl_after=1, nl_before=1, mc='green')


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='A simple script to upgrade pan database from version %s to version %s' % (current_version, next_version))
    parser.add_argument('pan_db', metavar = 'PAN_DB', help = "An anvi'o pan database of version %s" % current_version)
    args, unknown = parser.parse_known_args()

    try:
        migrate(args.pan_db)
    except ConfigError as e:
        print(e)
        sys.exit(-1)
