# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""!pomoc, and the two gates that keep it from going stale."""

from __future__ import annotations

from typing import TYPE_CHECKING

import httpx
import pytest

from signal_bot.animals import register_animal_commands
from signal_bot.art_command import register_art_command
from signal_bot.config import DEFAULT_COMMONS_API_URL, DEFAULT_POEM_TEXT_URL
from signal_bot.context import CommandContext
from signal_bot.help_command import (
    ALBUM_HEADING,
    COMMAND_NAME,
    GROUPS,
    HEADING,
    PACK_HEADING,
    SPELLINGS,
    register_help_command,
    render_help,
)
from signal_bot.http_client import ImageFetcher
from signal_bot.models import parse_envelope
from signal_bot.pack_add import register_add_command
from signal_bot.pack_command import register_pack_commands
from signal_bot.pack_holder import PackHolder
from signal_bot.pack_load import load as load_pack
from signal_bot.pack_random import register_random_command
from signal_bot.poem_command import register_poem_command
from signal_bot.popes_command import register_pope_command
from signal_bot.portraits import PortraitCache
from signal_bot.registry import CommandRegistry
from signal_bot.stats.commands import register_stats_commands
from signal_bot.suggest_command import register_suggest_command
from signal_bot.traps_command import register_trap_command
from tests import pack_fixture
from tests.conftest import SECOND_GROUP, WATCHED_GROUP, envelope

if TYPE_CHECKING:
    from pathlib import Path

    from signal_bot.config import Config
    from signal_bot.media_sniff import MediaKind
    from signal_bot.store import Store
    from signal_bot.transport_fake import FakeTransport


def _offline_fetcher() -> ImageFetcher:
    """A fetcher wired to a transport that refuses to be called.

    !pomoc never fetches anything, and the other commands are registered here
    only so that the help text has something to list.
    """

    def handler(request: httpx.Request) -> httpx.Response:
        raise AssertionError(request.url)

    return ImageFetcher(httpx.AsyncClient(transport=httpx.MockTransport(handler)))


def full_registry() -> CommandRegistry:
    """Every command the live bot registers, wired the way build_bot wires it."""
    registry = CommandRegistry()
    fetcher = _offline_fetcher()
    register_animal_commands(registry, fetcher)
    register_pope_command(registry, PortraitCache(fetcher, DEFAULT_COMMONS_API_URL))
    register_trap_command(registry, fetcher, DEFAULT_COMMONS_API_URL, traps=(1,))
    register_art_command(registry, fetcher, DEFAULT_COMMONS_API_URL, pools=((1,), (2,)))
    register_poem_command(registry, fetcher, DEFAULT_POEM_TEXT_URL, slugs=("impas",))
    register_stats_commands(registry)
    register_suggest_command(registry)
    register_help_command(registry)
    return registry


async def _noop(ctx: CommandContext) -> None:
    """A handler that does nothing."""


def test_every_registered_command_carries_a_description() -> None:
    """The whole point of making description a required argument."""
    for command in full_registry().commands:
        assert command.description.strip(), command.name


def test_help_lists_every_command_exactly_once() -> None:
    """A command missing from !pomoc, or listed twice, fails here.

    Asserted on the whole line rather than the bare trigger, so prose that
    happens to mention "!stats" can neither satisfy nor break it.
    """
    registry = full_registry()
    text = render_help(registry.commands, WATCHED_GROUP)
    for command in registry.commands:
        assert text.count(f"\n{command.primary} — {command.description}") == 1, command.name


def test_help_prints_the_polish_spelling_not_the_folded_one() -> None:
    """`triggers` holds skeletons; only `primary` still carries the diacritics."""
    text = render_help(full_registry().commands, WATCHED_GROUP)
    assert "!papież" in text
    assert "!papiez" not in text
    assert "!tydzień" in text


def test_headings_appear_in_order() -> None:
    """Obrazki, Papież, Statystyki, then the ungrouped block, then the note."""
    text = render_help(full_registry().commands, WATCHED_GROUP)
    positions = [text.index(f"\n{title}\n") for title, _ in GROUPS]
    assert positions == sorted(positions)
    assert text.startswith(HEADING)
    assert text.endswith(SPELLINGS)


def test_a_command_outside_the_groups_is_still_listed() -> None:
    """The safety net: forgetting to add a command to GROUPS cannot hide it."""
    registry = full_registry()
    registry.register("ping", ["!ping"], _noop, "odpowiada pong")
    assert "\n!ping — odpowiada pong" in render_help(registry.commands, WATCHED_GROUP)


def test_a_group_naming_an_unknown_command_fails_loudly() -> None:
    """A typo in GROUPS raises rather than silently dropping a line."""
    registry = CommandRegistry()
    register_help_command(registry)
    with pytest.raises(KeyError):
        render_help(registry.commands, WATCHED_GROUP)


async def test_the_handler_replies_with_the_rendered_list(
    transport: FakeTransport, store: Store, config: Config
) -> None:
    """!pomoc answers in the group that asked, quoting the asker."""
    registry = full_registry()
    command = registry.resolve("!pomoc")
    assert command is not None
    assert command.name == COMMAND_NAME
    message = parse_envelope(envelope(text="!pomoc"))
    assert message is not None
    await command.handler(
        CommandContext(
            message=message,
            group_id=WATCHED_GROUP,
            transport=transport,
            store=store,
            config=config,
            command_name=COMMAND_NAME,
            now=100.0,
            day="2026-08-30",
        )
    )
    assert transport.sent[0].recipient == WATCHED_GROUP
    assert transport.sent[0].text == render_help(registry.commands, WATCHED_GROUP)


@pytest.mark.parametrize("trigger", ["!pomoc", "!pomocy", "!help", "!komendy", "!commands"])
def test_every_alias_resolves(trigger: str) -> None:
    """All five spellings reach the same command."""
    command = full_registry().resolve(trigger)
    assert command is not None
    assert command.name == COMMAND_NAME


def test_an_album_gets_its_own_heading_and_a_hint(tmp_path: Path) -> None:
    """And the hint is built from real triggers, because they are the example."""
    registry = full_registry()
    register_pack_commands(registry, PackHolder(load_pack(pack_fixture.build(tmp_path / "pack"))))

    text = render_help(registry.commands, WATCHED_GROUP)

    assert f"\n{PACK_HEADING}\n" in text
    assert "!alfa — losowe zdjęcie tej osoby" in text
    assert "Kilka naraz (!alfa !beta)" in text


def test_the_album_is_invisible_in_every_other_group(tmp_path: Path) -> None:
    """The list is what would announce a private command family to strangers."""
    registry = full_registry()
    register_pack_commands(registry, PackHolder(load_pack(pack_fixture.build(tmp_path / "pack"))))

    text = render_help(registry.commands, SECOND_GROUP)

    assert PACK_HEADING not in text
    assert "alfa" not in text
    assert "!kot" in text


def test_a_pack_of_one_prints_no_hint(tmp_path: Path) -> None:
    """ "Combine them" needs two things to combine."""
    root = pack_fixture.build(
        tmp_path / "pack",
        people=[{"key": "p1", "triggers": ["!alfa"]}],
        combos=[],
        tags={},
    )
    registry = full_registry()
    register_pack_commands(registry, PackHolder(load_pack(root)))

    text = render_help(registry.commands, WATCHED_GROUP)

    assert PACK_HEADING in text
    assert "Kilka naraz" not in text


class _NoStripper:
    """Registration needs a stripper; rendering help never calls one."""

    def strip(self, payload: bytes, kind: MediaKind) -> bytes | None:
        return payload


def test_the_album_commands_get_their_own_block(tmp_path: Path) -> None:
    """Their own heading, so the "kilka naraz" hint keeps describing people.

    And neither description may name anybody: !pomoc prints them, and the
    trigger is the only place a name is allowed to appear.
    """
    holder = PackHolder(load_pack(pack_fixture.build(tmp_path / "pack")))
    registry = full_registry()
    register_pack_commands(registry, holder)
    register_random_command(registry, holder, ("!losowe",))
    register_add_command(registry, holder, _NoStripper(), ("!dodaj",))

    text = render_help(registry.commands, WATCHED_GROUP)

    assert f"\n{ALBUM_HEADING}\n" in text
    assert "!dodaj — dodaje załączone zdjęcie do albumu z podanymi etykietami" in text
    assert "!losowe — losowe zdjęcie z albumu, opcjonalnie po etykiecie" in text
    # The people's block is still its own, with its own hint.
    assert f"\n{PACK_HEADING}\n" in text
    assert "Kilka naraz (!alfa !beta)" in text


def test_the_album_commands_are_invisible_in_every_other_group(tmp_path: Path) -> None:
    holder = PackHolder(load_pack(pack_fixture.build(tmp_path / "pack")))
    registry = full_registry()
    register_pack_commands(registry, holder)
    register_random_command(registry, holder, ("!losowe",))
    register_add_command(registry, holder, _NoStripper(), ("!dodaj",))

    text = render_help(registry.commands, SECOND_GROUP)

    assert ALBUM_HEADING not in text
    assert "!dodaj" not in text
    assert "!losowe" not in text