# 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.
"""
Implementation of 'refresh' subcommand.
"""
from typing import Tuple, Optional
import argparse
import logging
from pathlib import Path

from nominatim.config import Configuration
from nominatim.db.connection import connect
from nominatim.tokenizer.base import AbstractTokenizer
from nominatim.clicmd.args import NominatimArgs

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

LOG = logging.getLogger()

def _parse_osm_object(obj: str) -> Tuple[str, int]:
    """ Parse the given argument into a tuple of OSM type and ID.
        Raises an ArgumentError if the format is not recognized.
    """
    if len(obj) < 2 or obj[0].lower() not in 'nrw' or not obj[1:].isdigit():
        raise argparse.ArgumentTypeError("Cannot parse OSM ID. Expect format: [N|W|R]<id>.")

    return (obj[0].upper(), int(obj[1:]))


class UpdateRefresh:
    """\
    Recompute auxiliary data used by the indexing process.

    This sub-commands updates various static data and functions in the database.
    It usually needs to be run after changing various aspects of the
    configuration. The configuration documentation will mention the exact
    command to use in such case.

    Warning: the 'update' command must not be run in parallel with other update
             commands like 'replication' or 'add-data'.
    """
    def __init__(self) -> None:
        self.tokenizer: Optional[AbstractTokenizer] = None

    def add_args(self, parser: argparse.ArgumentParser) -> None:
        group = parser.add_argument_group('Data arguments')
        group.add_argument('--postcodes', action='store_true',
                           help='Update postcode centroid table')
        group.add_argument('--word-tokens', action='store_true',
                           help='Clean up search terms')
        group.add_argument('--word-counts', action='store_true',
                           help='Compute frequency of full-word search terms')
        group.add_argument('--address-levels', action='store_true',
                           help='Reimport address level configuration')
        group.add_argument('--functions', action='store_true',
                           help='Update the PL/pgSQL functions in the database')
        group.add_argument('--wiki-data', action='store_true',
                           help='Update Wikipedia/data importance numbers')
        group.add_argument('--secondary-importance', action='store_true',
                           help='Update secondary importance raster data')
        group.add_argument('--importance', action='store_true',
                           help='Recompute place importances (expensive!)')
        group.add_argument('--website', action='store_true',
                           help='Refresh the directory that serves the scripts for the web API')
        group.add_argument('--data-object', action='append',
                           type=_parse_osm_object, metavar='OBJECT',
                           help='Mark the given OSM object as requiring an update'
                                ' (format: [NWR]<id>)')
        group.add_argument('--data-area', action='append',
                           type=_parse_osm_object, metavar='OBJECT',
                           help='Mark the area around the given OSM object as requiring an update'
                                ' (format: [NWR]<id>)')

        group = parser.add_argument_group('Arguments for function refresh')
        group.add_argument('--no-diff-updates', action='store_false', dest='diffs',
                           help='Do not enable code for propagating updates')
        group.add_argument('--enable-debug-statements', action='store_true',
                           help='Enable debug warning statements in functions')


    def run(self, args: NominatimArgs) -> int: #pylint: disable=too-many-branches, too-many-statements
        from ..tools import refresh, postcodes
        from ..indexer.indexer import Indexer


        if args.postcodes:
            if postcodes.can_compute(args.config.get_libpq_dsn()):
                LOG.warning("Update postcodes centroid")
                tokenizer = self._get_tokenizer(args.config)
                postcodes.update_postcodes(args.config.get_libpq_dsn(),
                                           args.project_dir, tokenizer)
                indexer = Indexer(args.config.get_libpq_dsn(), tokenizer,
                                  args.threads or 1)
                indexer.index_postcodes()
            else:
                LOG.error("The place table doesn't exist. "
                          "Postcode updates on a frozen database is not possible.")

        if args.word_tokens:
            LOG.warning('Updating word tokens')
            tokenizer = self._get_tokenizer(args.config)
            tokenizer.update_word_tokens()

        if args.word_counts:
            LOG.warning('Recompute word statistics')
            self._get_tokenizer(args.config).update_statistics()

        if args.address_levels:
            LOG.warning('Updating address levels')
            with connect(args.config.get_libpq_dsn()) as conn:
                refresh.load_address_levels_from_config(conn, args.config)

        # Attention: must come BEFORE functions
        if args.secondary_importance:
            with connect(args.config.get_libpq_dsn()) as conn:
                # If the table did not exist before, then the importance code
                # needs to be enabled.
                if not conn.table_exists('secondary_importance'):
                    args.functions = True

            LOG.warning('Import secondary importance raster data from %s', args.project_dir)
            if refresh.import_secondary_importance(args.config.get_libpq_dsn(),
                                                args.project_dir) > 0:
                LOG.fatal('FATAL: Cannot update sendary importance raster data')
                return 1

        if args.functions:
            LOG.warning('Create functions')
            with connect(args.config.get_libpq_dsn()) as conn:
                refresh.create_functions(conn, args.config,
                                         args.diffs, args.enable_debug_statements)
                self._get_tokenizer(args.config).update_sql_functions(args.config)

        if args.wiki_data:
            data_path = Path(args.config.WIKIPEDIA_DATA_PATH
                             or args.project_dir)
            LOG.warning('Import wikipdia article importance from %s', data_path)
            if refresh.import_wikipedia_articles(args.config.get_libpq_dsn(),
                                                 data_path) > 0:
                LOG.fatal('FATAL: Wikipedia importance dump file not found')
                return 1

        # Attention: importance MUST come after wiki data import.
        if args.importance:
            LOG.warning('Update importance values for database')
            with connect(args.config.get_libpq_dsn()) as conn:
                refresh.recompute_importance(conn)

        if args.website:
            webdir = args.project_dir / 'website'
            LOG.warning('Setting up website directory at %s', webdir)
            # This is a little bit hacky: call the tokenizer setup, so that
            # the tokenizer directory gets repopulated as well, in case it
            # wasn't there yet.
            self._get_tokenizer(args.config)
            with connect(args.config.get_libpq_dsn()) as conn:
                refresh.setup_website(webdir, args.config, conn)

        if args.data_object or args.data_area:
            with connect(args.config.get_libpq_dsn()) as conn:
                for obj in args.data_object or []:
                    refresh.invalidate_osm_object(*obj, conn, recursive=False)
                for obj in args.data_area or []:
                    refresh.invalidate_osm_object(*obj, conn, recursive=True)
                conn.commit()

        return 0


    def _get_tokenizer(self, config: Configuration) -> AbstractTokenizer:
        if self.tokenizer is None:
            from ..tokenizer import factory as tokenizer_factory

            self.tokenizer = tokenizer_factory.get_tokenizer_for_db(config)

        return self.tokenizer
