# SPDX-License-Identifier: GPL-2.0-only
#
# This file is part of Nominatim. (https://nominatim.org)
#
# Copyright (C) 2022 by the Nominatim developer community.
# For a full list of authors see the git log.
"""
Functions for database analysis and maintenance.
"""
from typing import Optional, Tuple, Any, cast
import logging

from psycopg2.extras import Json, register_hstore

from nominatim.config import Configuration
from nominatim.db.connection import connect, Cursor
from nominatim.tokenizer import factory as tokenizer_factory
from nominatim.errors import UsageError
from nominatim.data.place_info import PlaceInfo
from nominatim.typing import DictCursorResult

LOG = logging.getLogger()

def _get_place_info(cursor: Cursor, osm_id: Optional[str],
                    place_id: Optional[int]) -> DictCursorResult:
    sql = """SELECT place_id, extra.*
             FROM placex, LATERAL placex_indexing_prepare(placex) as extra
          """

    values: Tuple[Any, ...]
    if osm_id:
        osm_type = osm_id[0].upper()
        if osm_type not in 'NWR' or not osm_id[1:].isdigit():
            LOG.fatal('OSM ID must be of form <N|W|R><id>. Got: %s', osm_id)
            raise UsageError("OSM ID parameter badly formatted")

        sql += ' WHERE placex.osm_type = %s AND placex.osm_id = %s'
        values = (osm_type, int(osm_id[1:]))
    elif place_id is not None:
        sql += ' WHERE placex.place_id = %s'
        values = (place_id, )
    else:
        LOG.fatal("No OSM object given to index.")
        raise UsageError("OSM object not found")

    cursor.execute(sql + ' LIMIT 1', values)

    if cursor.rowcount < 1:
        LOG.fatal("OSM object %s not found in database.", osm_id)
        raise UsageError("OSM object not found")

    return cast(DictCursorResult, cursor.fetchone())


def analyse_indexing(config: Configuration, osm_id: Optional[str] = None,
                     place_id: Optional[int] = None) -> None:
    """ Analyse indexing of a single Nominatim object.
    """
    with connect(config.get_libpq_dsn()) as conn:
        register_hstore(conn)
        with conn.cursor() as cur:
            place = _get_place_info(cur, osm_id, place_id)

            cur.execute("update placex set indexed_status = 2 where place_id = %s",
                        (place['place_id'], ))

            cur.execute("""SET auto_explain.log_min_duration = '0';
                           SET auto_explain.log_analyze = 'true';
                           SET auto_explain.log_nested_statements = 'true';
                           LOAD 'auto_explain';
                           SET client_min_messages = LOG;
                           SET log_min_messages = FATAL""")

            tokenizer = tokenizer_factory.get_tokenizer_for_db(config)

            with tokenizer.name_analyzer() as analyzer:
                cur.execute("""UPDATE placex
                               SET indexed_status = 0, address = %s, token_info = %s,
                               name = %s, linked_place_id = %s
                               WHERE place_id = %s""",
                            (place['address'],
                             Json(analyzer.process_place(PlaceInfo(place))),
                             place['name'], place['linked_place_id'], place['place_id']))

        # we do not want to keep the results
        conn.rollback()

        for msg in conn.notices:
            print(msg)
