# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""Answering one photo request: what gets sent, and what gets refused."""

from __future__ import annotations

import base64
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 (
    EITHER,
    EVERYBODY,
    NO_PHOTO,
    ONE_PERSON,
    description_for,
    register_pack_commands,
)
from signal_bot.pack_holder import PackHolder
from signal_bot.pack_load import load
from signal_bot.registry import CommandRegistry
from tests import pack_fixture
from tests.conftest import WATCHED_GROUP, envelope

if TYPE_CHECKING:
    from pathlib import Path

    from signal_bot.config import Config
    from signal_bot.pack import Pack
    from signal_bot.registry import Handler
    from signal_bot.store import Store
    from signal_bot.transport_fake import FakeTransport


@pytest.fixture
def pack(tmp_path: Path) -> Pack:
    return load(pack_fixture.build(tmp_path / "pack"))


def _registry(pack: Pack) -> CommandRegistry:
    registry = CommandRegistry()
    register_pack_commands(registry, PackHolder(pack))
    return registry


def _ctx(
    transport: FakeTransport,
    store: Store,
    config: Config,
    text: str,
    args: tuple[str, ...] = (),
) -> CommandContext:
    message = parse_envelope(envelope(text=text))
    assert message is not None
    return CommandContext(
        message=message,
        group_id=WATCHED_GROUP,
        transport=transport,
        store=store,
        config=config,
        command_name="pack:p1",
        now=0.0,
        day="2026-08-30",
        args=args,
    )


async def _run(
    pack: Pack, transport: FakeTransport, store: Store, config: Config, text: str
) -> None:
    """Type one line at the pack, the way the dispatcher would."""
    registry = _registry(pack)
    resolved = registry.resolve_with_args(text, WATCHED_GROUP)
    assert resolved is not None
    await resolved.command.handler(_ctx(transport, store, config, text, resolved.args))


def test_each_entry_shape_explains_itself(pack: Pack) -> None:
    by_key = {entry.key: entry for entry in pack.entries}
    assert description_for(by_key["p1"]) == ONE_PERSON
    assert description_for(by_key["c1"]) == EVERYBODY
    assert description_for(by_key["c2"]) == EITHER


def test_a_description_never_names_anybody(pack: Pack) -> None:
    """!pomoc prints it; the trigger is the only place a name may appear."""
    for entry in pack.entries:
        described = description_for(entry)
        assert described in {ONE_PERSON, EVERYBODY, EITHER}
        assert not any(trigger.strip("!") in described for trigger in entry.triggers)


async def test_a_photo_is_sent_with_its_own_type_and_name(
    pack: Pack, transport: FakeTransport, store: Store, config: Config
) -> None:
    await _run(pack, transport, store, config, "!gamma")
    sent = transport.sent[0]
    assert sent.filename == "gamma.png"
    assert sent.media_type == "image/png"
    assert sent.image_base64 is not None
    assert base64.b64decode(sent.image_base64) == pack_fixture.PIXEL
    assert sent.quote is not None


async def test_two_names_want_a_photo_with_both(
    pack: Pack, transport: FakeTransport, store: Store, config: Config
) -> None:
    """both.png is the only file tagged with p1 and p2 at once."""
    await _run(pack, transport, store, config, "!alfa beta")
    assert transport.sent[0].filename == "both.png"


async def test_the_second_name_may_carry_its_own_bang(
    pack: Pack, transport: FakeTransport, store: Store, config: Config
) -> None:
    await _run(pack, transport, store, config, "!alfa !beta")
    assert transport.sent[0].filename == "both.png"


async def test_a_combination_nobody_photographed_is_answered_in_one_line(
    pack: Pack, transport: FakeTransport, store: Store, config: Config
) -> None:
    await _run(pack, transport, store, config, "!beta gamma")
    assert transport.texts == [NO_PHOTO]
    assert transport.sent[0].image_base64 is None


async def test_a_name_nobody_has_gets_the_same_answer(
    pack: Pack, transport: FakeTransport, store: Store, config: Config
) -> None:
    """From the group's side it is the same question: is there such a photo?"""
    await _run(pack, transport, store, config, "!alfa nikt")
    assert transport.texts == [NO_PHOTO]


async def test_a_choice_lands_on_the_reading_that_has_a_photo(
    tmp_path: Path, transport: FakeTransport, store: Store, config: Config
) -> None:
    """p2 has no photo at all, so "either of them" must land on p3 every time.

    Deterministic on purpose. Asserting that a random choice eventually
    produces both readings is a test that fails one run in sixteen, and this
    repo has already shipped one bug because a random API was believed after
    a single call.
    """
    pack = load(pack_fixture.build(tmp_path / "pack", tags={"gamma.png": ["p3"]}))
    for _ in range(5):
        await _run(pack, transport, store, config, "!ktokolwiek")
    assert [message.filename for message in transport.sent] == ["gamma.png"] * 5


async def test_a_choice_with_nothing_behind_either_reading_is_answered(
    tmp_path: Path, transport: FakeTransport, store: Store, config: Config
) -> None:
    pack = load(pack_fixture.build(tmp_path / "pack", tags={"alfa.png": ["p1"]}))
    await _run(pack, transport, store, config, "!ktokolwiek")
    assert transport.texts == [NO_PHOTO]


async def test_a_video_keeps_being_a_video(
    tmp_path: Path, transport: FakeTransport, store: Store, config: Config
) -> None:
    """Told it is a jpeg, Signal renders an unplayable file."""
    pack = load(pack_fixture.build(tmp_path / "pack", tags={"clip.mp4": ["p1"]}))
    await _run(pack, transport, store, config, "!alfa")
    assert transport.sent[0].media_type == "video/mp4"
    assert transport.sent[0].filename == "clip.mp4"


def test_every_command_is_named_by_key_and_scoped_to_the_pack(pack: Pack) -> None:
    """A log line or a command_uses row must not say who was asked for."""
    registry = _registry(pack)
    assert [command.name for command in registry.commands] == [
        "pack:p1",
        "pack:p2",
        "pack:p3",
        "pack:c1",
        "pack:c2",
    ]
    for command in registry.commands:
        assert command.groups == pack.groups
        assert command.takes_args


def test_the_gate_is_applied_to_every_entry(pack: Pack) -> None:
    registry = CommandRegistry()
    marked: list[str] = []

    def decorate(handler: Handler) -> Handler:
        """Count the wrap and change nothing else."""
        marked.append("wrapped")
        return handler

    register_pack_commands(registry, PackHolder(pack), decorate=decorate)
    assert len(marked) == len(pack.entries)