#!/opt/anaconda1anaconda2anaconda3/bin/python
# -*- coding: utf-8

import sys
import argparse

import anvio.db as db
import anvio.tables as t
import anvio.dbops as dbops
import anvio.terminal as terminal 

from anvio.errors import ConfigError


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

current_version = '6'
next_version    = '7'

def update_contigs_db(contigs_db_path, just_do_it = False):
    if contigs_db_path is None:
        raise ConfigError("No database path is given.")

    # make sure someone is not being funny
    dbops.is_contigs_db(contigs_db_path)

    # make sure the version is 2
    contigs_db = db.DB(contigs_db_path, None, ignore_version = True)
    if str(contigs_db.get_version()) != current_version:
        raise ConfigError("Version of this contigs database is not %s (hence, this script cannot really do anything)." % current_version)

    if not just_do_it:
        try:
            run.warning("This script will try to upgrade your contigs database from v%s to v%s. It happens to be that this\
                         upgrade will in fact remove every HMM hits from your database, and you will need to re-run your\
                         `anvi-run-hmms` program on your contigs database to get them back :( We are very sorry for the\
                         inconvenience, but this change will make anvi'o more suitable for certain operations going\
                         forward. If you are OK with this, just press ENTER to continue. If you want to cancel the\
                         upgrade, press CTRL+C now. If you want to avoid this message the next time, use '--just-do-it'\
                         flag." % (current_version, next_version))
            input("Press ENTER to continue...\n")
        except:
            print()
            sys.exit()

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

    # drop the old tables:
    try:
        contigs_db._exec('''DROP TABLE %s''' % (t.hmm_hits_info_table_name))
        contigs_db._exec('''DROP TABLE %s''' % (t.hmm_hits_table_name))
        contigs_db._exec('''DROP TABLE %s''' % (t.hmm_hits_splits_table_name))
    except:
        pass
    contigs_db.commit()

    # create new empty ones
    contigs_db.create_table(t.hmm_hits_info_table_name, t.hmm_hits_info_table_structure, t.hmm_hits_info_table_types)
    contigs_db.create_table(t.hmm_hits_table_name, t.hmm_hits_table_structure, t.hmm_hits_table_types)
    contigs_db.create_table(t.hmm_hits_splits_table_name, t.hmm_hits_splits_table_structure, t.hmm_hits_splits_table_types)

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

    # bye
    contigs_db.disconnect()

    # bye
    progress.end()
    run.info_single("The contigs database successfully upgraded from version %s to %s!" % (current_version, next_version))
    run.warning("You no longer have any HMM hits in this contigs database. Don't forget to run `anvi-run-hmms` on it!")

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='A simple script to upgrade contigs database from version %s to version %s' % (current_version, next_version))
    parser.add_argument('contigs_db', metavar = 'CONTIGS_DB', help = 'Contigs database')
    parser.add_argument('--just-do-it', default=False, action="store_true", help = "Do not bother me with warnings")
    args = parser.parse_args()

    try:
        update_contigs_db(args.contigs_db, just_do_it = args.just_do_it)
    except ConfigError as e:
        print(e)
        sys.exit(-1)
