# SPDX-License-Identifier: GPL-3.0-or-later
#
# This file is part of Nominatim. (https://nominatim.org)
#
# Copyright (C) 2023 by the Nominatim developer community.
# For a full list of authors see the git log.
"""
SQLAlchemy definitions for all tables used by the frontend.
"""
from typing import Any

import sqlalchemy as sa
from sqlalchemy.dialects.postgresql import HSTORE, ARRAY, JSONB, array
from sqlalchemy.dialects.sqlite import JSON as sqlite_json

import nominatim.db.sqlalchemy_functions #pylint: disable=unused-import
from nominatim.db.sqlalchemy_types import Geometry

class PostgresTypes:
    """ Type definitions for complex types as used in Postgres variants.
    """
    Composite = HSTORE
    Json = JSONB
    IntArray = ARRAY(sa.Integer()) #pylint: disable=invalid-name
    to_array = array


class SqliteTypes:
    """ Type definitions for complex types as used in Postgres variants.
    """
    Composite = sqlite_json
    Json = sqlite_json
    IntArray = sqlite_json

    @staticmethod
    def to_array(arr: Any) -> Any:
        """ Sqlite has no special conversion for arrays.
        """
        return arr


#pylint: disable=too-many-instance-attributes
class SearchTables:
    """ Data class that holds the tables of the Nominatim database.

        This schema strictly reflects the read-access view of the database.
        Any data used for updates only will not be visible.
    """

    def __init__(self, meta: sa.MetaData, engine_name: str) -> None:
        if engine_name == 'postgresql':
            self.types: Any = PostgresTypes
        elif engine_name == 'sqlite':
            self.types = SqliteTypes
        else:
            raise ValueError("Only 'postgresql' and 'sqlite' engines are supported.")

        self.meta = meta

        self.import_status = sa.Table('import_status', meta,
            sa.Column('lastimportdate', sa.DateTime(True), nullable=False),
            sa.Column('sequence_id', sa.Integer),
            sa.Column('indexed', sa.Boolean))

        self.properties = sa.Table('nominatim_properties', meta,
            sa.Column('property', sa.Text, nullable=False),
            sa.Column('value', sa.Text))

        self.placex = sa.Table('placex', meta,
            sa.Column('place_id', sa.BigInteger, nullable=False),
            sa.Column('parent_place_id', sa.BigInteger),
            sa.Column('linked_place_id', sa.BigInteger),
            sa.Column('importance', sa.Float),
            sa.Column('indexed_date', sa.DateTime),
            sa.Column('rank_address', sa.SmallInteger),
            sa.Column('rank_search', sa.SmallInteger),
            sa.Column('indexed_status', sa.SmallInteger),
            sa.Column('osm_type', sa.String(1), nullable=False),
            sa.Column('osm_id', sa.BigInteger, nullable=False),
            sa.Column('class', sa.Text, nullable=False, key='class_'),
            sa.Column('type', sa.Text, nullable=False),
            sa.Column('admin_level', sa.SmallInteger),
            sa.Column('name', self.types.Composite),
            sa.Column('address', self.types.Composite),
            sa.Column('extratags', self.types.Composite),
            sa.Column('geometry', Geometry, nullable=False),
            sa.Column('wikipedia', sa.Text),
            sa.Column('country_code', sa.String(2)),
            sa.Column('housenumber', sa.Text),
            sa.Column('postcode', sa.Text),
            sa.Column('centroid', Geometry))

        self.addressline = sa.Table('place_addressline', meta,
            sa.Column('place_id', sa.BigInteger),
            sa.Column('address_place_id', sa.BigInteger),
            sa.Column('distance', sa.Float),
            sa.Column('fromarea', sa.Boolean),
            sa.Column('isaddress', sa.Boolean))

        self.postcode = sa.Table('location_postcode', meta,
            sa.Column('place_id', sa.BigInteger),
            sa.Column('parent_place_id', sa.BigInteger),
            sa.Column('rank_search', sa.SmallInteger),
            sa.Column('rank_address', sa.SmallInteger),
            sa.Column('indexed_status', sa.SmallInteger),
            sa.Column('indexed_date', sa.DateTime),
            sa.Column('country_code', sa.String(2)),
            sa.Column('postcode', sa.Text),
            sa.Column('geometry', Geometry))

        self.osmline = sa.Table('location_property_osmline', meta,
            sa.Column('place_id', sa.BigInteger, nullable=False),
            sa.Column('osm_id', sa.BigInteger),
            sa.Column('parent_place_id', sa.BigInteger),
            sa.Column('indexed_date', sa.DateTime),
            sa.Column('startnumber', sa.Integer),
            sa.Column('endnumber', sa.Integer),
            sa.Column('step', sa.SmallInteger),
            sa.Column('indexed_status', sa.SmallInteger),
            sa.Column('linegeo', Geometry),
            sa.Column('address', self.types.Composite),
            sa.Column('postcode', sa.Text),
            sa.Column('country_code', sa.String(2)))

        self.country_name = sa.Table('country_name', meta,
            sa.Column('country_code', sa.String(2)),
            sa.Column('name', self.types.Composite),
            sa.Column('derived_name', self.types.Composite),
            sa.Column('partition', sa.Integer))

        self.country_grid = sa.Table('country_osm_grid', meta,
            sa.Column('country_code', sa.String(2)),
            sa.Column('area', sa.Float),
            sa.Column('geometry', Geometry))

        # The following tables are not necessarily present.
        self.search_name = sa.Table('search_name', meta,
            sa.Column('place_id', sa.BigInteger),
            sa.Column('importance', sa.Float),
            sa.Column('search_rank', sa.SmallInteger),
            sa.Column('address_rank', sa.SmallInteger),
            sa.Column('name_vector', self.types.IntArray),
            sa.Column('nameaddress_vector', self.types.IntArray),
            sa.Column('country_code', sa.String(2)),
            sa.Column('centroid', Geometry))

        self.tiger = sa.Table('location_property_tiger', meta,
            sa.Column('place_id', sa.BigInteger),
            sa.Column('parent_place_id', sa.BigInteger),
            sa.Column('startnumber', sa.Integer),
            sa.Column('endnumber', sa.Integer),
            sa.Column('step', sa.SmallInteger),
            sa.Column('linegeo', Geometry),
            sa.Column('postcode', sa.Text))