# SPDX-License-Identifier: GPL-3.0-or-later
#
# This file is part of Nominatim. (https://nominatim.org)
#
# Copyright (C) 2024 by the Nominatim developer community.
# For a full list of authors see the git log.
"""
Mix-ins that provide the actual commands for the indexer for various indexing
tasks.
"""
from typing import Any, Sequence

from psycopg import sql as pysql
from psycopg.abc import Query
from psycopg.rows import DictRow
from psycopg.types.json import Json

from ..typing import Protocol
from ..data.place_info import PlaceInfo
from ..tokenizer.base import AbstractAnalyzer


def _mk_valuelist(template: str, num: int) -> pysql.Composed:
    return pysql.SQL(',').join([pysql.SQL(template)] * num)


def _analyze_place(place: DictRow, analyzer: AbstractAnalyzer) -> Json:
    return Json(analyzer.process_place(PlaceInfo(place)))


class Runner(Protocol):
    def name(self) -> str: ...
    def sql_count_objects(self) -> Query: ...
    def sql_get_objects(self) -> Query: ...
    def index_places_query(self, batch_size: int) -> Query: ...
    def index_places_params(self, place: DictRow) -> Sequence[Any]: ...


SELECT_SQL = pysql.SQL("""SELECT place_id, extra.*
                          FROM (SELECT * FROM placex {}) as px,
                          LATERAL placex_indexing_prepare(px) as extra """)
UPDATE_LINE = "(%s, %s::hstore, %s::hstore, %s::int, %s::jsonb)"


class AbstractPlacexRunner:
    """ Returns SQL commands for indexing of the placex table.
    """

    def __init__(self, rank: int, analyzer: AbstractAnalyzer) -> None:
        self.rank = rank
        self.analyzer = analyzer

    def index_places_query(self, batch_size: int) -> Query:
        return pysql.SQL(
            """ UPDATE placex
                SET indexed_status = 0, address = v.addr, token_info = v.ti,
                    name = v.name, linked_place_id = v.linked_place_id
                FROM (VALUES {}) as v(id, name, addr, linked_place_id, ti)
                WHERE place_id = v.id
            """).format(_mk_valuelist(UPDATE_LINE, batch_size))

    def index_places_params(self, place: DictRow) -> Sequence[Any]:
        return (place['place_id'],
                place['name'],
                place['address'],
                place['linked_place_id'],
                _analyze_place(place, self.analyzer))


class RankRunner(AbstractPlacexRunner):
    """ Returns SQL commands for indexing one rank within the placex table.
    """

    def name(self) -> str:
        return f"rank {self.rank}"

    def sql_count_objects(self) -> pysql.Composed:
        return pysql.SQL("""SELECT count(*) FROM placex
                            WHERE rank_address = {} and indexed_status > 0
                         """).format(pysql.Literal(self.rank))

    def sql_get_objects(self) -> pysql.Composed:
        return SELECT_SQL.format(pysql.SQL(
                """WHERE placex.indexed_status > 0 and placex.rank_address = {}
                   ORDER BY placex.geometry_sector
                """).format(pysql.Literal(self.rank)))


class BoundaryRunner(AbstractPlacexRunner):
    """ Returns SQL commands for indexing the administrative boundaries
        of a certain rank.
    """

    def name(self) -> str:
        return f"boundaries rank {self.rank}"

    def sql_count_objects(self) -> Query:
        return pysql.SQL("""SELECT count(*) FROM placex
                            WHERE indexed_status > 0
                              AND rank_search = {}
                              AND class = 'boundary' and type = 'administrative'
                         """).format(pysql.Literal(self.rank))

    def sql_get_objects(self) -> Query:
        return SELECT_SQL.format(pysql.SQL(
                """WHERE placex.indexed_status > 0 and placex.rank_search = {}
                         and placex.class = 'boundary' and placex.type = 'administrative'
                   ORDER BY placex.partition, placex.admin_level
                """).format(pysql.Literal(self.rank)))


class InterpolationRunner:
    """ Returns SQL commands for indexing the address interpolation table
        location_property_osmline.
    """

    def __init__(self, analyzer: AbstractAnalyzer) -> None:
        self.analyzer = analyzer

    def name(self) -> str:
        return "interpolation lines (location_property_osmline)"

    def sql_count_objects(self) -> Query:
        return """SELECT count(*) FROM location_property_osmline
                  WHERE indexed_status > 0"""

    def sql_get_objects(self) -> Query:
        return """SELECT place_id, get_interpolation_address(address, osm_id) as address
                  FROM location_property_osmline
                  WHERE indexed_status > 0
                  ORDER BY geometry_sector"""

    def index_places_query(self, batch_size: int) -> Query:
        return pysql.SQL("""UPDATE location_property_osmline
                            SET indexed_status = 0, address = v.addr, token_info = v.ti
                            FROM (VALUES {}) as v(id, addr, ti)
                            WHERE place_id = v.id
                         """).format(_mk_valuelist("(%s, %s::hstore, %s::jsonb)", batch_size))

    def index_places_params(self, place: DictRow) -> Sequence[Any]:
        return (place['place_id'], place['address'],
                _analyze_place(place, self.analyzer))


class PostcodeRunner(Runner):
    """ Provides the SQL commands for indexing the location_postcode table.
    """

    def name(self) -> str:
        return "postcodes (location_postcode)"

    def sql_count_objects(self) -> Query:
        return 'SELECT count(*) FROM location_postcode WHERE indexed_status > 0'

    def sql_get_objects(self) -> Query:
        return """SELECT place_id FROM location_postcode
                  WHERE indexed_status > 0
                  ORDER BY country_code, postcode"""

    def index_places_query(self, batch_size: int) -> Query:
        return pysql.SQL("""UPDATE location_postcode SET indexed_status = 0
                                    WHERE place_id IN ({})""")\
                    .format(pysql.SQL(',').join((pysql.Placeholder() for _ in range(batch_size))))

    def index_places_params(self, place: DictRow) -> Sequence[Any]:
        return (place['place_id'], )