"""Unit tests for agent_team.transport.slack_live (§3.3.1, §7.1 P1).

The live poster is the production ``slack_sdk`` backing for the §3.3.1 injected
``SlackPoster`` seam. These tests prove the contract entirely with mocks (no
network, and ``slack_sdk`` itself is never required): the poster maps the
adapter's message dict to the ``chat.postMessage`` parameters Slack accepts,
the ``ts`` round-trips as the ``channel_ref`` through a real ``SlackTransport``,
``callback_id`` is dropped (not a valid postMessage param) while ``metadata``
carries the durable ``question_id``, and a missing package / token or a client
failure fails loudly.
"""

from __future__ import annotations

import importlib
from typing import Any

import pytest

from agent_team.transport.base import QuestionSet
from agent_team.transport.slack_adapter import SlackPostError, SlackTransport
from agent_team.transport.slack_live import (
    build_live_slack_transport,
    build_slack_poster,
)


# --------------------------------------------------------------------------- #
# Test doubles                                                                #
# --------------------------------------------------------------------------- #


class _FakeWebClient:
    """A fake ``slack_sdk.WebClient`` recording ``chat_postMessage`` kwargs."""

    def __init__(self, response: dict[str, Any] | None = None) -> None:
        self.response = (
            response if response is not None else {"ts": "169.1", "ok": True}
        )
        self.calls: list[dict[str, Any]] = []

    def chat_postMessage(self, **kwargs: Any) -> dict[str, Any]:
        self.calls.append(kwargs)
        return self.response


class _DataResponse:
    """A ``slack_sdk.SlackResponse``-like object exposing the payload via ``.data``."""

    def __init__(self, data: dict[str, Any]) -> None:
        self.data = data


class _SlackApiErrorLike(Exception):
    """Stands in for ``slack_sdk.errors.SlackApiError`` (no slack_sdk needed)."""


class _FailingClient:
    """A fake client whose ``chat_postMessage`` raises a Slack-API-like error."""

    def chat_postMessage(self, **kwargs: Any) -> dict[str, Any]:
        raise _SlackApiErrorLike("the_dog_ate_it")


def _question_set() -> QuestionSet:
    return QuestionSet(
        thread_id="task-7",
        question_id="q-42",
        turn=1,
        questions=["Ship it?"],
        context={"repo": "agent-team"},
    )


# --------------------------------------------------------------------------- #
# Clean import without slack_sdk                                              #
# --------------------------------------------------------------------------- #


def test_module_imports_without_slack_sdk(monkeypatch: pytest.MonkeyPatch) -> None:
    """The module imports cleanly even when ``slack_sdk`` cannot be imported."""
    import builtins

    real_import = builtins.__import__

    def _blocked_import(name: str, *args: Any, **kwargs: Any) -> Any:
        if name == "slack_sdk" or name.startswith("slack_sdk."):
            raise ImportError("slack_sdk is blocked for this test")
        return real_import(name, *args, **kwargs)

    monkeypatch.setattr(builtins, "__import__", _blocked_import)

    module = importlib.reload(
        importlib.import_module("agent_team.transport.slack_live")
    )
    assert hasattr(module, "build_slack_poster")
    assert hasattr(module, "build_live_slack_transport")


# --------------------------------------------------------------------------- #
# Happy path: injected fake client                                           #
# --------------------------------------------------------------------------- #


def test_poster_returns_mapping_with_ts() -> None:
    """The poster forwards to the client and returns a mapping carrying ``ts``."""
    client = _FakeWebClient()
    poster = build_slack_poster(client=client)

    result = poster(
        {
            "channel": "C123",
            "callback_id": "shq:q-42",
            "text": "hi",
            "blocks": [],
            "metadata": {"event_type": "agent_team_question"},
        }
    )

    assert result["ts"] == "169.1"


def test_post_question_round_trips_ts_as_channel_ref() -> None:
    """Wired through a real ``SlackTransport``, ``ts`` becomes the channel_ref."""
    client = _FakeWebClient()
    transport = SlackTransport("C123", poster=build_slack_poster(client=client))

    channel_ref = transport.post_question(
        thread_id="task-7",
        question_id="q-42",
        turn=1,
        question_set=_question_set(),
        deadline="2026-06-18T00:00:00Z",
    )

    assert channel_ref == "169.1"


def test_callback_id_dropped_metadata_carries_question_id() -> None:
    """``callback_id`` is not sent; ``metadata`` carries the durable question_id."""
    client = _FakeWebClient()
    transport = SlackTransport("C123", poster=build_slack_poster(client=client))

    transport.post_question(
        thread_id="task-7",
        question_id="q-42",
        turn=1,
        question_set=_question_set(),
        deadline="2026-06-18T00:00:00Z",
    )

    assert len(client.calls) == 1
    kwargs = client.calls[0]
    # callback_id is NOT a valid chat.postMessage parameter and must be dropped.
    assert "callback_id" not in kwargs
    # metadata IS forwarded and carries the durable inbound question_id.
    assert kwargs["metadata"]["event_payload"]["question_id"] == "q-42"
    # the accepted parameters are forwarded.
    assert kwargs["channel"] == "C123"
    assert "text" in kwargs
    assert "blocks" in kwargs


def test_convenience_transport_factory() -> None:
    """``build_live_slack_transport`` wires the live poster onto a transport."""
    client = _FakeWebClient()
    transport = build_live_slack_transport("C123", client=client)

    channel_ref = transport.post_question(
        thread_id="task-7",
        question_id="q-42",
        turn=1,
        question_set=_question_set(),
        deadline="2026-06-18T00:00:00Z",
    )

    assert channel_ref == "169.1"


def test_poster_accepts_slack_response_with_data_attr() -> None:
    """A ``SlackResponse``-like object is coerced via its ``.data`` mapping."""
    client = _FakeWebClient(response=None)
    client.response = _DataResponse({"ts": "169.1", "ok": True})  # type: ignore[assignment]
    poster = build_slack_poster(client=client)

    result = poster({"channel": "C123", "text": "hi"})

    assert result["ts"] == "169.1"


class _UnsupportedResponseClient:
    """A fake client returning neither a mapping nor an object with ``.data``."""

    def chat_postMessage(self, **kwargs: Any) -> Any:
        return object()


def test_poster_unsupported_response_raises_type_error() -> None:
    """A response that is neither a mapping nor has a mapping ``.data`` is fatal.

    Exercises the ``_as_mapping`` guard: a bare object (no ``ts``, no ``.data``)
    cannot yield a ``channel_ref``, so the poster raises ``TypeError`` with the
    guard's "unsupported response" message rather than silently dropping the ts.
    """
    poster = build_slack_poster(client=_UnsupportedResponseClient())

    with pytest.raises(TypeError, match="unsupported response"):
        poster({"channel": "C123", "text": "hi"})


# --------------------------------------------------------------------------- #
# Failure modes                                                              #
# --------------------------------------------------------------------------- #


def test_missing_token_raises_runtime_error(monkeypatch: pytest.MonkeyPatch) -> None:
    """No token and no SLACK_BOT_TOKEN raises a clear RuntimeError.

    Stub ``slack_sdk`` into ``sys.modules`` so the deferred import SUCCEEDS and
    the no-token branch is what's under test. Without this the test is
    environment-dependent: where slack_sdk is absent (CI) the import-missing
    error fires first and masks the token check (local-vs-CI drift).
    """
    import sys
    from types import ModuleType

    fake = ModuleType("slack_sdk")
    fake.WebClient = lambda **kw: None  # type: ignore[attr-defined]
    monkeypatch.setitem(sys.modules, "slack_sdk", fake)
    monkeypatch.delenv("SLACK_BOT_TOKEN", raising=False)

    with pytest.raises(RuntimeError, match="Slack bot token"):
        build_slack_poster()


def test_missing_package_raises_runtime_error(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """A missing ``slack_sdk`` package raises a clear RuntimeError."""
    import builtins

    real_import = builtins.__import__

    def _blocked_import(name: str, *args: Any, **kwargs: Any) -> Any:
        if name == "slack_sdk" or name.startswith("slack_sdk."):
            raise ImportError("slack_sdk is blocked for this test")
        return real_import(name, *args, **kwargs)

    monkeypatch.setattr(builtins, "__import__", _blocked_import)
    monkeypatch.setenv("SLACK_BOT_TOKEN", "xoxb-present")

    with pytest.raises(RuntimeError, match="slack_sdk is unavailable"):
        build_slack_poster()


def test_client_failure_surfaces_as_slack_post_error() -> None:
    """A SlackApiError-like client failure surfaces as ``SlackPostError``."""
    transport = SlackTransport(
        "C123", poster=build_slack_poster(client=_FailingClient())
    )

    with pytest.raises(SlackPostError):
        transport.post_question(
            thread_id="task-7",
            question_id="q-42",
            turn=1,
            question_set=_question_set(),
            deadline="2026-06-18T00:00:00Z",
        )