"""
Implementation of the 'index' subcommand.
"""
import psutil

from nominatim.db import status
from nominatim.db.connection import connect

# Do not repeat documentation of subcommand classes.
# pylint: disable=C0111
# Using non-top-level imports to avoid eventually unused imports.
# pylint: disable=E0012,C0415


class UpdateIndex:
    """\
    Reindex all new and modified data.

    Indexing is the process of computing the address and search terms for
    the places in the database. Every time data is added or changed, indexing
    needs to be run. Imports and replication updates automatically take care
    of indexing. For other cases, this function allows to run indexing manually.
    """

    @staticmethod
    def add_args(parser):
        group = parser.add_argument_group('Filter arguments')
        group.add_argument('--boundaries-only', action='store_true',
                           help="""Index only administrative boundaries.""")
        group.add_argument('--no-boundaries', action='store_true',
                           help="""Index everything except administrative boundaries.""")
        group.add_argument('--minrank', '-r', type=int, metavar='RANK', default=0,
                           help='Minimum/starting rank')
        group.add_argument('--maxrank', '-R', type=int, metavar='RANK', default=30,
                           help='Maximum/finishing rank')

    @staticmethod
    def run(args):
        from ..indexer.indexer import Indexer
        from ..tokenizer import factory as tokenizer_factory

        tokenizer = tokenizer_factory.get_tokenizer_for_db(args.config)

        indexer = Indexer(args.config.get_libpq_dsn(), tokenizer,
                          args.threads or psutil.cpu_count() or 1)

        if not args.no_boundaries:
            indexer.index_boundaries(args.minrank, args.maxrank)
        if not args.boundaries_only:
            indexer.index_by_rank(args.minrank, args.maxrank)

        if not args.no_boundaries and not args.boundaries_only \
           and args.minrank == 0 and args.maxrank == 30:
            with connect(args.config.get_libpq_dsn()) as conn:
                status.set_indexed(conn, True)

        return 0