# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""!random: the only door to a custom tag, and the one that mints nothing."""

from __future__ import annotations

import json
from typing import TYPE_CHECKING

import pytest

from signal_bot.context import CommandContext
from signal_bot.models import parse_envelope
from signal_bot.pack_command import NO_PHOTO
from signal_bot.pack_custom import CUSTOM_FILE
from signal_bot.pack_holder import PackHolder
from signal_bot.pack_load import load
from signal_bot.pack_random import COMMAND_NAME, register_random_command
from signal_bot.registry import CommandRegistry
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.registry import Handler
    from signal_bot.store import Store
    from signal_bot.transport_fake import FakeTransport

TRIGGERS = ("!losowe", "!random")


@pytest.fixture
def holder(tmp_path: Path) -> PackHolder:
    root = pack_fixture.build(tmp_path / "pack")
    (root / CUSTOM_FILE).write_text(
        json.dumps({"t1": ["wakacje"], "t2": ["gory"]}), encoding="utf-8"
    )
    tags = json.loads((root / "tags.json").read_text(encoding="utf-8"))
    tags["alfa.png"] = ["p1", "t1"]
    (root / "tags.json").write_text(json.dumps(tags), encoding="utf-8")
    return PackHolder(load(root))


def _registry(holder: PackHolder) -> CommandRegistry:
    registry = CommandRegistry()
    register_random_command(registry, holder, TRIGGERS)
    return registry


async def _run(
    holder: PackHolder,
    transport: FakeTransport,
    store: Store,
    config: Config,
    text: str,
    group: str = WATCHED_GROUP,
) -> None:
    registry = _registry(holder)
    resolved = registry.resolve_with_args(text, group)
    if resolved is None:
        return
    message = parse_envelope(envelope(text=text))
    assert message is not None
    await resolved.command.handler(
        CommandContext(
            message=message,
            group_id=group,
            transport=transport,
            store=store,
            config=config,
            command_name=resolved.command.name,
            now=0.0,
            day="2026-08-31",
            args=resolved.args,
        )
    )


async def test_a_bare_random_posts_something_from_the_whole_album(
    holder: PackHolder, transport: FakeTransport, store: Store, config: Config
) -> None:
    """matching(frozenset()) is already "everything", so there is no new path."""
    await _run(holder, transport, store, config, "!losowe")
    assert transport.sent[-1].image_base64 is not None


async def test_a_custom_label_narrows_to_its_own_photos(
    holder: PackHolder, transport: FakeTransport, store: Store, config: Config
) -> None:
    await _run(holder, transport, store, config, "!losowe wakacje")
    assert transport.sent[-1].filename == "alfa.png"


async def test_a_label_nobody_has_gets_one_line_and_no_photo(
    holder: PackHolder, transport: FakeTransport, store: Store, config: Config
) -> None:
    await _run(holder, transport, store, config, "!losowe niktnietaki")
    assert transport.texts[-1] == NO_PHOTO


async def test_a_typo_on_random_mints_nothing(
    holder: PackHolder, transport: FakeTransport, store: Store, config: Config
) -> None:
    """The reason !random does not share !add_photo's resolver."""
    before = (holder.pack.directory / CUSTOM_FILE).read_text(encoding="utf-8")
    await _run(holder, transport, store, config, "!losowe wakacjee")
    assert (holder.pack.directory / CUSTOM_FILE).read_text(encoding="utf-8") == before
    assert holder.pack.custom.keys == {"t1", "t2"}


async def test_a_tag_nobody_photographed_gets_one_line(
    holder: PackHolder, transport: FakeTransport, store: Store, config: Config
) -> None:
    await _run(holder, transport, store, config, "!losowe gory")
    assert transport.texts[-1] == NO_PHOTO


async def test_two_labels_intersect(
    holder: PackHolder, transport: FakeTransport, store: Store, config: Config
) -> None:
    """t1 and t2 share no photo, so the intersection is empty."""
    await _run(holder, transport, store, config, "!losowe wakacje gory")
    assert transport.texts[-1] == NO_PHOTO


async def test_too_many_labels_are_refused_rather_than_multiplied(
    holder: PackHolder, transport: FakeTransport, store: Store, config: Config
) -> None:
    await _run(holder, transport, store, config, "!losowe " + " ".join(["wakacje"] * 7))
    assert transport.texts[-1] == NO_PHOTO


async def test_random_never_resolves_a_person(
    holder: PackHolder, transport: FakeTransport, store: Store, config: Config
) -> None:
    """!alfa already exists; a second entrance would be one too many."""
    await _run(holder, transport, store, config, "!losowe alfa")
    assert transport.texts[-1] == NO_PHOTO


async def test_it_does_not_exist_in_a_group_the_album_was_not_given_to(
    holder: PackHolder, transport: FakeTransport, store: Store, config: Config
) -> None:
    await _run(holder, transport, store, config, "!losowe wakacje", group=SECOND_GROUP)
    assert transport.sent == []


def test_it_is_scoped_and_named_by_pseudonym(holder: PackHolder) -> None:
    command = _registry(holder).commands[0]
    assert command.name == COMMAND_NAME
    assert command.groups == holder.pack.groups
    assert "wakacje" not in command.description


async def test_a_tag_minted_after_registration_still_resolves(
    holder: PackHolder, transport: FakeTransport, store: Store, config: Config
) -> None:
    """The resolver reads the holder, so a swap is enough -- no re-register.

    The swap is what ``POST /_reload`` does through the registry rebuild.
    """
    root = holder.pack.directory
    (root / CUSTOM_FILE).write_text(
        json.dumps({"t1": ["wakacje"], "t2": ["gory"], "t3": ["nowe"]}), encoding="utf-8"
    )
    tags = json.loads((root / "tags.json").read_text(encoding="utf-8"))
    tags["gamma.png"] = ["p3", "t3"]
    (root / "tags.json").write_text(json.dumps(tags), encoding="utf-8")
    holder.pack = load(root)

    await _run(holder, transport, store, config, "!losowe nowe")
    assert transport.sent[-1].filename == "gamma.png"


def test_the_cooldown_decorator_is_applied_when_given(holder: PackHolder) -> None:
    """!random is a photo poster, so it takes the same cooldown as !alfa."""
    calls: list[str] = []

    def decorate(handler: Handler) -> Handler:
        calls.append("wrapped")
        return handler

    registry = CommandRegistry()
    register_random_command(registry, holder, TRIGGERS, decorate=decorate)
    assert calls == ["wrapped"]