# 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.
"""
Provides custom functions over command-line arguments.
"""
from typing import Optional, List, Dict, Any, Sequence, Tuple
import argparse
import logging
from pathlib import Path

from typing_extensions import Protocol

from nominatim.errors import UsageError
from nominatim.config import Configuration

LOG = logging.getLogger()

class Subcommand(Protocol):
    """
    Interface to be implemented by classes implementing a CLI subcommand.
    """

    def add_args(self, parser: argparse.ArgumentParser) -> None:
        """
        Fill the given parser for the subcommand with the appropriate
        parameters.
        """

    def run(self, args: 'NominatimArgs') -> int:
        """
        Run the subcommand with the given parsed arguments.
        """


class NominatimArgs:
    """ Customized namespace class for the nominatim command line tool
        to receive the command-line arguments.
    """
    # Basic environment set by root program.
    config: Configuration
    project_dir: Path
    module_dir: Path
    osm2pgsql_path: Path
    phplib_dir: Path
    sqllib_dir: Path
    data_dir: Path
    config_dir: Path
    phpcgi_path: Path

    # Global switches
    version: bool
    subcommand: Optional[str]
    command: Subcommand

    # Shared parameters
    osm2pgsql_cache: Optional[int]
    socket_timeout: int

    # Arguments added to all subcommands.
    verbose: int
    threads: Optional[int]

    # Arguments to 'add-data'
    file: Optional[str]
    diff: Optional[str]
    node: Optional[int]
    way: Optional[int]
    relation: Optional[int]
    tiger_data: Optional[str]
    use_main_api: bool

    # Arguments to 'admin'
    warm: bool
    check_database: bool
    migrate: bool
    analyse_indexing: bool
    target: Optional[str]
    osm_id: Optional[str]
    place_id: Optional[int]

    # Arguments to 'import'
    osm_file: List[str]
    continue_at: Optional[str]
    reverse_only: bool
    no_partitions: bool
    no_updates: bool
    offline: bool
    ignore_errors: bool
    index_noanalyse: bool

    # Arguments to 'index'
    boundaries_only: bool
    no_boundaries: bool
    minrank: int
    maxrank: int

    # Arguments to 'export'
    output_type: str
    output_format: str
    output_all_postcodes: bool
    language: Optional[str]
    restrict_to_country: Optional[str]
    restrict_to_osm_node: Optional[int]
    restrict_to_osm_way: Optional[int]
    restrict_to_osm_relation: Optional[int]

    # Arguments to 'refresh'
    postcodes: bool
    word_tokens: bool
    word_counts: bool
    address_levels: bool
    functions: bool
    wiki_data: bool
    importance: bool
    website: bool
    diffs: bool
    enable_debug_statements: bool
    data_object: Sequence[Tuple[str, int]]
    data_area: Sequence[Tuple[str, int]]

    # Arguments to 'replication'
    init: bool
    update_functions: bool
    check_for_updates: bool
    once: bool
    catch_up: bool
    do_index: bool

    # Arguments to 'serve'
    server: str

    # Arguments to 'special-phrases
    import_from_wiki: bool
    import_from_csv: Optional[str]
    no_replace: bool

    # Arguments to all query functions
    format: str
    addressdetails: bool
    extratags: bool
    namedetails: bool
    lang: Optional[str]
    polygon_output: Optional[str]
    polygon_threshold: Optional[float]

    # Arguments to 'search'
    query: Optional[str]
    street: Optional[str]
    city: Optional[str]
    county: Optional[str]
    state: Optional[str]
    country: Optional[str]
    postalcode: Optional[str]
    countrycodes: Optional[str]
    exclude_place_ids: Optional[str]
    limit: Optional[int]
    viewbox: Optional[str]
    bounded: bool
    dedupe: bool

    # Arguments to 'reverse'
    lat: float
    lon: float
    zoom: Optional[int]

    # Arguments to 'lookup'
    ids: Sequence[str]

    # Arguments to 'details'
    object_class: Optional[str]


    def osm2pgsql_options(self, default_cache: int,
                          default_threads: int) -> Dict[str, Any]:
        """ Return the standard osm2pgsql options that can be derived
            from the command line arguments. The resulting dict can be
            further customized and then used in `run_osm2pgsql()`.
        """
        return dict(osm2pgsql=self.config.OSM2PGSQL_BINARY or self.osm2pgsql_path,
                    osm2pgsql_cache=self.osm2pgsql_cache or default_cache,
                    osm2pgsql_style=self.config.get_import_style_file(),
                    threads=self.threads or default_threads,
                    dsn=self.config.get_libpq_dsn(),
                    flatnode_file=str(self.config.get_path('FLATNODE_FILE') or ''),
                    tablespaces=dict(slim_data=self.config.TABLESPACE_OSM_DATA,
                                     slim_index=self.config.TABLESPACE_OSM_INDEX,
                                     main_data=self.config.TABLESPACE_PLACE_DATA,
                                     main_index=self.config.TABLESPACE_PLACE_INDEX
                                    )
                   )


    def get_osm_file_list(self) -> Optional[List[Path]]:
        """ Return the --osm-file argument as a list of Paths or None
            if no argument was given. The function also checks if the files
            exist and raises a UsageError if one cannot be found.
        """
        if not self.osm_file:
            return None

        files = [Path(f) for f in self.osm_file]
        for fname in files:
            if not fname.is_file():
                LOG.fatal("OSM file '%s' does not exist.", fname)
                raise UsageError('Cannot access file.')

        return files