"""api.app coverage — FastAPI factory + lifespan.

`create_app()` wires every router. We assert the FastAPI instance comes back
with the expected metadata and that every prefixed route is mounted, then
exercise the lifespan with all heavy I/O patched out (init_db, transcription,
extraction, optimal-service).
"""

from __future__ import annotations

from contextlib import ExitStack, asynccontextmanager
from typing import TYPE_CHECKING
from unittest.mock import AsyncMock, MagicMock, patch

import pytest
from fastapi import FastAPI
from roboco.api.app import app as default_app
from roboco.api.app import create_app, lifespan
from roboco.api.deps import clear_orchestrator, set_orchestrator

if TYPE_CHECKING:
    from collections.abc import AsyncIterator


def _registered_paths(app: FastAPI) -> set[str]:
    """Every registered path, robust to FastAPI 0.137+ routing internals.

    From 0.137, ``include_router`` wraps each sub-router in an ``_IncludedRouter``
    (a ``BaseRoute`` with no ``.path``) instead of flattening its routes into
    ``app.routes`` — so ``{r.path for r in app.routes}`` raised AttributeError
    and missed every included route. Collect HTTP paths from the OpenAPI schema
    (the stable public contract) plus each included router's prefix, which also
    covers websocket mounts like ``/ws`` that never appear in the schema.
    """
    paths = set(app.openapi().get("paths", {}))
    for r in app.routes:
        path = getattr(r, "path", None)
        if isinstance(path, str):
            paths.add(path)
        prefix = getattr(getattr(r, "include_context", None), "prefix", None)
        if prefix:
            paths.add(prefix)
    return paths


def test_default_app_is_a_fastapi_instance() -> None:
    """Importing the module yields a configured FastAPI instance."""
    assert isinstance(default_app, FastAPI)
    assert default_app.title == "RoboCo API"


def test_create_app_returns_new_instance_each_call() -> None:
    a = create_app()
    b = create_app()
    assert a is not b
    assert isinstance(a, FastAPI)


def test_create_app_registers_all_router_prefixes() -> None:
    """Every router is mounted under its expected prefix."""
    app = create_app()
    paths = _registered_paths(app)
    # Spot-check a representative path from each prefix group.
    expected_prefixes = [
        "/api/agents",
        "/api/channels",
        "/api/groups",
        "/api/sessions",
        "/api/messages",
        "/api/notifications",
        "/api/stream",
        "/api/optimal",
        "/api/journals",
        "/api/tasks",
        "/api/kanban",
        "/api/dashboard",
        "/api/orchestrator",
        "/api/a2a",
        "/api/git",
        "/api/projects",
        "/api/providers",
        "/api/work-sessions",
        "/api/docs",
        "/ws",
    ]
    for prefix in expected_prefixes:
        assert any(p.startswith(prefix) for p in paths), (
            f"No routes registered under {prefix}"
        )


def test_create_app_includes_v1_flow_routes() -> None:
    """API v1 (intent-verb) routers from `routes/v1/*` are mounted."""
    app = create_app()
    paths = _registered_paths(app)
    # v1 routers register their own prefixes; we just confirm /api/v1 paths
    # exist after include_router.
    assert any(p.startswith("/api/v1") for p in paths)


def test_create_app_attaches_cors_middleware() -> None:
    app = create_app()
    middleware_classes = [getattr(m.cls, "__name__", "") for m in app.user_middleware]
    assert "CORSMiddleware" in middleware_classes


# ---------------------------------------------------------------------------
# Lifespan — startup + shutdown with heavy IO patched
# ---------------------------------------------------------------------------


@asynccontextmanager
async def _stub_get_optimal() -> AsyncIterator[MagicMock]:
    """Stand-in for the optimal-service factory."""
    yield MagicMock()


@pytest.mark.asyncio
async def test_lifespan_startup_and_shutdown_happy_path() -> None:
    """Lifespan does init_db + service starts + optimal init + clean shutdown."""
    transcription_mock = MagicMock()
    transcription_mock.start = AsyncMock()
    transcription_mock.stop = AsyncMock()

    with (
        patch("roboco.api.app.init_db", new=AsyncMock()),
        patch("roboco.api.app.close_db", new=AsyncMock()),
        patch("roboco.api.app.TranscriptionService", return_value=transcription_mock),
        patch("roboco.api.app.ExtractionService"),
        patch("roboco.api.app.ExtractionPipeline"),
        patch(
            "roboco.api.app.get_optimal_service",
            new=AsyncMock(return_value=MagicMock()),
        ),
        patch("roboco.api.app.close_optimal_service", new=AsyncMock()),
    ):
        app = create_app()
        async with lifespan(app):
            # During startup transcription was started + state populated.
            transcription_mock.start.assert_awaited_once()
            assert app.state.transcription is transcription_mock
            assert app.state.extraction is not None
            assert app.state.optimal is not None
        # After yield, shutdown ran.
        transcription_mock.stop.assert_awaited_once()


@pytest.mark.asyncio
async def test_lifespan_stops_orchestrator_before_closing_db_and_optimal() -> None:
    """F117: orchestrator.stop() must run BEFORE close_optimal_service / close_db
    on shutdown. stop() drains fire-and-forget DB writes (respawn_tracker
    upserts, audit-log rows) and stop_agent finalizes work sessions / agent
    state — all needing the DB still open. Closing the DB first (the old order,
    where only bootstrap's finally called stop() after lifespan had already
    closed the DB) silently dropped those final writes."""
    order: list[str] = []

    def _record(label: str) -> AsyncMock:
        async def _fn() -> None:
            order.append(label)

        return AsyncMock(side_effect=_fn)

    transcription_mock = MagicMock()
    transcription_mock.start = AsyncMock()
    transcription_mock.stop = AsyncMock()
    orchestrator_mock = MagicMock()
    orchestrator_mock.stop = _record("orchestrator.stop")

    set_orchestrator(orchestrator_mock)
    try:
        with (
            patch("roboco.api.app.init_db", new=AsyncMock()),
            patch("roboco.api.app.close_db", new=_record("close_db")),
            patch(
                "roboco.api.app.close_optimal_service",
                new=_record("close_optimal_service"),
            ),
            patch(
                "roboco.api.app.TranscriptionService", return_value=transcription_mock
            ),
            patch("roboco.api.app.ExtractionService"),
            patch("roboco.api.app.ExtractionPipeline"),
            patch(
                "roboco.api.app.get_optimal_service",
                new=AsyncMock(return_value=MagicMock()),
            ),
        ):
            app = create_app()
            async with lifespan(app):
                pass
    finally:
        # Clear the global so it doesn't leak into other tests.
        clear_orchestrator()

    # orchestrator.stop() ran, and it ran BEFORE close_optimal_service + close_db.
    assert "orchestrator.stop" in order
    assert order.index("orchestrator.stop") < order.index("close_optimal_service")
    assert order.index("orchestrator.stop") < order.index("close_db")
    # The DB is still the last thing closed (innermost resource).
    assert order.index("close_optimal_service") < order.index("close_db")


@pytest.mark.asyncio
async def test_lifespan_handles_optimal_init_failure_gracefully() -> None:
    """Optimal-service init failure → app.state.optimal=None, no raise."""
    transcription_mock = MagicMock()
    transcription_mock.start = AsyncMock()
    transcription_mock.stop = AsyncMock()

    with (
        patch("roboco.api.app.init_db", new=AsyncMock()),
        patch("roboco.api.app.close_db", new=AsyncMock()),
        patch("roboco.api.app.TranscriptionService", return_value=transcription_mock),
        patch("roboco.api.app.ExtractionService"),
        patch("roboco.api.app.ExtractionPipeline"),
        patch(
            "roboco.api.app.get_optimal_service",
            new=AsyncMock(side_effect=RuntimeError("boom")),
        ),
        patch("roboco.api.app.close_optimal_service", new=AsyncMock()),
    ):
        app = create_app()
        async with lifespan(app):
            assert app.state.optimal is None


def _lifespan_io_patches() -> list:
    transcription_mock = MagicMock()
    transcription_mock.start = AsyncMock()
    transcription_mock.stop = AsyncMock()
    return [
        patch("roboco.api.app.init_db", new=AsyncMock()),
        patch("roboco.api.app.close_db", new=AsyncMock()),
        patch("roboco.api.app.TranscriptionService", return_value=transcription_mock),
        patch("roboco.api.app.ExtractionService"),
        patch("roboco.api.app.ExtractionPipeline"),
        patch(
            "roboco.api.app.get_optimal_service",
            new=AsyncMock(return_value=MagicMock()),
        ),
        patch("roboco.api.app.close_optimal_service", new=AsyncMock()),
    ]


def _header_trust_warnings(logger_mock: MagicMock) -> list:
    return [
        c
        for c in logger_mock.warning.call_args_list
        if c.args and "HEADER-TRUST" in c.args[0]
    ]


async def _run_lifespan_with(*, auth_required: bool, logger_mock: MagicMock) -> None:
    """Run the lifespan with heavy I/O patched and the auth flag forced."""
    with ExitStack() as stack:
        for cm in _lifespan_io_patches():
            stack.enter_context(cm)
        stack.enter_context(
            patch("roboco.api.app._auth_required", return_value=auth_required)
        )
        stack.enter_context(patch("roboco.api.app.logger", logger_mock))
        app = create_app()
        async with lifespan(app):
            pass


@pytest.mark.asyncio
async def test_lifespan_warns_in_header_trust_mode() -> None:
    """Startup warns when agent auth is not enforced (header-trust mode)."""
    logger_mock = MagicMock()
    await _run_lifespan_with(auth_required=False, logger_mock=logger_mock)
    assert _header_trust_warnings(logger_mock), (
        "header-trust startup warning expected when auth is not required"
    )


@pytest.mark.asyncio
async def test_lifespan_no_header_trust_warning_when_auth_required() -> None:
    """No header-trust warning when ROBOCO_AGENT_AUTH_REQUIRED enforces tokens."""
    logger_mock = MagicMock()
    await _run_lifespan_with(auth_required=True, logger_mock=logger_mock)
    assert not _header_trust_warnings(logger_mock)