"""Tests for ratatoskr.tui per docs/contracts/issues/4.contract.md."""

from unittest.mock import MagicMock

import httpx
import pytest
import respx
from textual.widgets import RichLog

from ratatoskr.cli import ParsedArgs
from ratatoskr.sse_client import (
    Cancelled,
    Done,
    Error,
    SseId,
    Text,
    TextBoundary,
    Thinking,
    ToolResult,
    ToolStart,
    WorkerPhase,
)
from ratatoskr.tui import RatatoskrApp, _cancel_via_sse, _render_event_to_log

_CANCEL_OK_RESP = {"turn_id": 42, "cancelled": True, "reason": None, "partial_message_id": None}
_CREATE_OK_RESP = {
    "session_id": "s-new12345",
    "agent_id": "mimir",
    "message_count": 0,
    "created_at": "2026-05-21T00:00:00+00:00",
    "last_active": "2026-05-21T00:00:00+00:00",
    "metadata": {},
}


def _args_new(**overrides) -> ParsedArgs:
    base = dict(
        send_content=None,
        session_id=None,
        new=True,
        agent_id="mimir",
        api_key="k",
        server_url="https://w.example",
        raw=False,
    )
    base.update(overrides)
    return ParsedArgs(**base)


def _args_existing(session_id: str = "s-1existing", **overrides) -> ParsedArgs:
    base = dict(
        send_content=None,
        session_id=session_id,
        new=False,
        agent_id=None,
        api_key="k",
        server_url="https://w.example",
        raw=False,
    )
    base.update(overrides)
    return ParsedArgs(**base)


def _spy_writes(monkeypatch) -> list:
    """Patch RichLog.write to record every arg into a list (returned)."""
    writes: list = []
    original = RichLog.write

    def spy(self, content, **kw):
        writes.append(content)
        return original(self, content, **kw)

    monkeypatch.setattr(RichLog, "write", spy)
    return writes


def _resolved_app(
    args: ParsedArgs,
    *,
    session_id: str | None = None,
    agent_id: str | None = None,
    client: httpx.AsyncClient | None = None,
) -> RatatoskrApp:
    """Construct RatatoskrApp with pre-resolved state (issue #6 lifecycle).

    Production path: `run_tui` → `_resolve_then_run` opens AsyncClient, mints
    or attaches session, then constructs the App with the resolved tuple. This
    helper inlines that shape so tests bypass the pre-flight without
    re-implementing it. The client is opened here (and leaks at test teardown
    — acceptable; respx mocks all network calls and pytest exits cleanly).
    """
    sid = session_id if session_id is not None else (args.session_id or "s-default")
    aid = args.agent_id if agent_id is None else agent_id
    if client is None:
        client = httpx.AsyncClient(
            base_url=args.server_url,
            headers={"Authorization": f"Bearer {args.api_key}"},
            timeout=httpx.Timeout(connect=10.0, read=None, write=10.0, pool=10.0),
        )
    return RatatoskrApp(args, session_id=sid, agent_id=aid, client=client)


SID = SseId(42, 5)


class TestRenderEventToLog:
    def test_text_renders_raw_delta(self) -> None:
        """text_renders_raw_delta [happy,tracer]: Text → log.write('hello')."""
        log = MagicMock()
        _render_event_to_log(Text(sse_id=SID, content="hello"), log=log, raw=False)
        log.write.assert_called_once_with("hello")

    def test_done_renders_label_only(self) -> None:
        """done_renders_label_only: …"""
        log = MagicMock()
        evt = Done(
            sse_id=SID,
            phase="completed",
            response="hi there",
            model="glm5-turbo",
            duration_ms=1234,
            usage={"prompt": 1, "completion": 2},
        )
        _render_event_to_log(evt, log=log, raw=False)
        log.write.assert_called_once()
        line = log.write.call_args[0][0]
        assert line.startswith("[done]")
        assert "turn_id=42" in line
        assert "model=glm5-turbo" in line
        # POST-003: the Done line is labels only; markdown render is the caller's job
        assert "hi there" not in line

    def test_error_renders_label(self) -> None:
        """error_renders_label: Error → log line starts with [error]."""
        log = MagicMock()
        evt = Error(sse_id=SID, phase="failed", message="boom", error_code="llm_output_invalid")
        _render_event_to_log(evt, log=log, raw=False)
        line = log.write.call_args[0][0]
        assert line.startswith("[error]")
        assert "turn_id=42" in line
        assert "code=llm_output_invalid" in line

    def test_cancelled_renders_label(self) -> None:
        """cancelled_renders_label: Cancelled → log line starts with [cancelled]."""
        log = MagicMock()
        evt = Cancelled(
            sse_id=SID, phase="cancelled", turn_id=42, reason="user", partial_message_id=7
        )
        _render_event_to_log(evt, log=log, raw=False)
        line = log.write.call_args[0][0]
        assert line.startswith("[cancelled]")
        assert "reason='user'" in line
        assert "partial_message_id=7" in line

    def test_worker_phase_renders_label(self) -> None:
        """worker_phase_renders_label: WorkerPhase → log line starts with [worker_phase]."""
        log = MagicMock()
        evt = WorkerPhase(sse_id=SID, phase="streaming", turn_id=42)
        _render_event_to_log(evt, log=log, raw=False)
        line = log.write.call_args[0][0]
        assert line.startswith("[worker_phase]")
        assert "phase=streaming" in line

    def test_thinking_truncated(self) -> None:
        """thinking_truncated [trace]: …"""
        log = MagicMock()
        _render_event_to_log(Thinking(sse_id=SID, content="a" * 500), log=log, raw=False)
        line = log.write.call_args[0][0]
        assert line.startswith("[thinking]")
        assert "a" * 500 not in line
        assert "a" * 200 in line

    def test_tool_start_renders_label(self) -> None:
        """tool_start_renders_label: ToolStart → [tool_start] name=... args=..."""
        log = MagicMock()
        evt = ToolStart(sse_id=SID, name="read_file", arguments={"path": "/x"})
        _render_event_to_log(evt, log=log, raw=False)
        line = log.write.call_args[0][0]
        assert line.startswith("[tool_start] name=read_file args=")

    def test_tool_result_truncated(self) -> None:
        """tool_result_truncated [trace]: …"""
        log = MagicMock()
        evt = ToolResult(sse_id=SID, name="x", result="b" * 500, duration_ms=42)
        _render_event_to_log(evt, log=log, raw=False)
        line = log.write.call_args[0][0]
        assert line.startswith("[tool_result]")
        # The whole repr-portion of the result is truncated to 200; the full 500-b
        # string can never fit in line whole.
        assert "b" * 500 not in line

    def test_text_boundary_renders_label(self) -> None:
        """text_boundary_renders_label: TextBoundary → [text_boundary] kind=... char_offset=..."""
        log = MagicMock()
        evt = TextBoundary(sse_id=SID, kind="sentence", char_offset=128, ts="2026-05-21T00:00:00Z")
        _render_event_to_log(evt, log=log, raw=False)
        line = log.write.call_args[0][0]
        assert line.startswith("[text_boundary]")
        assert "kind=sentence" in line
        assert "char_offset=128" in line


class TestCancelViaSse:
    @respx.mock
    async def test_happy_cancel(self) -> None:
        """happy_cancel [happy,tracer]: 200 OK → returns None; log has no [cancel_failed]."""
        respx.post("https://w.example/sessions/s-1/turns/42/cancel").mock(
            return_value=httpx.Response(200, json=_CANCEL_OK_RESP)
        )
        log = MagicMock()
        async with httpx.AsyncClient(base_url="https://w.example") as client:
            result = await _cancel_via_sse(client, "s-1", 42, log=log)
        assert result is None
        log.write.assert_not_called()

    @respx.mock
    async def test_cancel_failed_500(self) -> None:
        """cancel_failed_500 [error]: …"""
        respx.post("https://w.example/sessions/s-1/turns/42/cancel").mock(
            return_value=httpx.Response(500, content=b"boom")
        )
        log = MagicMock()
        async with httpx.AsyncClient(base_url="https://w.example") as client:
            await _cancel_via_sse(client, "s-1", 42, log=log)
        line = log.write.call_args[0][0]
        assert "[cancel_failed]" in line
        assert "CancelFailed" in line

    @respx.mock
    async def test_cancel_already_completed(self) -> None:
        """cancel_already_completed [scenario]: 409 → '[cancel_failed] CancelAlreadyCompleted:'."""
        respx.post("https://w.example/sessions/s-1/turns/42/cancel").mock(
            return_value=httpx.Response(409)
        )
        log = MagicMock()
        async with httpx.AsyncClient(base_url="https://w.example") as client:
            await _cancel_via_sse(client, "s-1", 42, log=log)
        line = log.write.call_args[0][0]
        assert "[cancel_failed]" in line
        assert "CancelAlreadyCompleted" in line

    @respx.mock
    async def test_transport_error_swallowed(self) -> None:
        """transport_error_swallowed [error]: …"""
        respx.post("https://w.example/sessions/s-1/turns/42/cancel").mock(
            side_effect=httpx.ConnectError("network down")
        )
        log = MagicMock()
        async with httpx.AsyncClient(base_url="https://w.example") as client:
            await _cancel_via_sse(client, "s-1", 42, log=log)
        line = log.write.call_args[0][0]
        assert "[cancel_failed]" in line
        assert "ConnectError" in line


class TestAppMount:
    """on_mount narrows per issue #6: only identity-widget population.

    Session resolution + AsyncClient open + error-on-resolve are exercised at
    the `_resolve_then_run` layer (see TestResolveThenRun); only happy mount
    paths remain here, exercised with pre-resolved state via _resolved_app.
    """

    async def test_happy_new_session_mount(self) -> None:
        """happy_new_session_mount [happy,tracer]: identity populated from pre-resolved state."""
        app = _resolved_app(_args_new(), session_id="s-new12345", agent_id="mimir")
        async with app.run_test() as pilot:
            await pilot.pause()
            assert app.session_id == "s-new12345"
            assert app.agent_id == "mimir"
            assert app.state == "idle"
            # INV-002: session identity visible — agent_id + last 8 of session_id
            assert "mimir" in (app.sub_title or "")
            assert app.session_id[-8:] in (app.sub_title or "")

    async def test_happy_existing_session_mount(self) -> None:
        """happy_existing_session_mount: identity shows <unknown> when agent_id is None."""
        app = _resolved_app(_args_existing(session_id="s-existing-tail8x"))
        async with app.run_test() as pilot:
            await pilot.pause()
            assert app.session_id == "s-existing-tail8x"
            assert app.state == "idle"
            # INV-002 carve-out: agent unknown → <unknown> · …<tail>
            assert "<unknown>" in (app.sub_title or "")
            assert app.session_id[-8:] in (app.sub_title or "")

    async def test_footer_identity_visible_first_frame(self) -> None:
        """footer_identity_visible_first_frame [trace]: identity widget rendered first frame."""
        from textual.widgets import Static

        app = _resolved_app(_args_new(), session_id="s-new12345", agent_id="mimir")
        async with app.run_test() as pilot:
            await pilot.pause()
            identity_widget = app.query_one("#identity", Static)
            rendered = str(identity_widget.render())
            assert "mimir" in rendered
            assert "·" in rendered
            assert app.session_id[-8:] in rendered


import asyncio  # noqa: E402

from textual.widgets import Input  # noqa: E402


async def _noop_worker(self, content: str) -> None:
    """Fake _stream_turn_worker that never completes (lets state stay 'streaming')."""
    await asyncio.Future()  # await forever; cancelled when test exits


class TestOnInputSubmitted:
    @respx.mock
    async def test_happy_submit_echoes_and_spawns(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """happy_submit_echoes_and_spawns [happy,tracer]: …"""
        monkeypatch.setattr(RatatoskrApp, "_stream_turn_worker", _noop_worker)
        writes = _spy_writes(monkeypatch)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            inp = app.query_one("#prompt", Input)
            inp.value = "hello"
            await inp.action_submit()
            await pilot.pause()
            assert any("❯ hello" in str(w) for w in writes)  # noqa: RUF001
            assert inp.value == ""
            assert app.state == "streaming"
            assert app.stream_worker is not None

    @respx.mock
    async def test_empty_submit_no_op(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """empty_submit_no_op [trace]: '' + Enter → no change; no worker spawned."""
        monkeypatch.setattr(RatatoskrApp, "_stream_turn_worker", _noop_worker)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            # Spy AFTER mount so identity-widget writes (if any) aren't counted.
            writes = _spy_writes(monkeypatch)
            inp = app.query_one("#prompt", Input)
            inp.value = ""
            await inp.action_submit()
            await pilot.pause()
            assert app.state == "idle"
            assert app.stream_worker is None
            # POST: no RichLog write fires on empty submit
            assert writes == []

    @respx.mock
    async def test_submit_during_streaming_shows_busy_notice(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """submit_during_streaming_shows_busy_notice [adversarial]: …"""
        monkeypatch.setattr(RatatoskrApp, "_stream_turn_worker", _noop_worker)
        writes = _spy_writes(monkeypatch)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            inp = app.query_one("#prompt", Input)
            # First submit: enters streaming
            inp.value = "first"
            await inp.action_submit()
            await pilot.pause()
            first_worker = app.stream_worker
            assert app.state == "streaming"
            # Second submit while streaming → busy notice; no new worker
            writes.clear()
            inp.value = "second"
            await inp.action_submit()
            await pilot.pause()
            assert any("[busy] turn in flight; input ignored" in str(w) for w in writes)
            assert app.stream_worker is first_worker  # unchanged
            assert app.state == "streaming"
            assert inp.value == ""

    @respx.mock
    async def test_submit_during_cancelling_shows_busy_notice(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """submit_during_cancelling_shows_busy_notice [adversarial]: …"""
        monkeypatch.setattr(RatatoskrApp, "_stream_turn_worker", _noop_worker)
        writes = _spy_writes(monkeypatch)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            app.state = "cancelling"  # bypass the natural transition for the test
            assert app.stream_worker is None  # no live worker before non-idle submit
            inp = app.query_one("#prompt", Input)
            inp.value = "x"
            await inp.action_submit()
            await pilot.pause()
            assert any("[busy]" in str(w) for w in writes)
            assert app.state == "cancelling"
            # POST-005 (from issue #4 on_input_submitted contract):
            # input cleared; NO new worker spawned during non-idle submit.
            assert inp.value == ""
            assert app.stream_worker is None

    @respx.mock
    async def test_footer_hint_flips_to_cancel(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """footer_hint_flips_to_cancel [trace]: hint widget shows 'Ctrl-C to cancel'."""
        from textual.widgets import Static

        monkeypatch.setattr(RatatoskrApp, "_stream_turn_worker", _noop_worker)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            hint_widget = app.query_one("#hint", Static)
            assert str(hint_widget.render()) == RatatoskrApp.HINT_IDLE
            inp = app.query_one("#prompt", Input)
            inp.value = "hi"
            await inp.action_submit()
            await pilot.pause()
            assert str(hint_widget.render()) == RatatoskrApp.HINT_STREAMING


import json  # noqa: E402


def _sse_chunk(sse_id: str, body: dict) -> bytes:
    return f"id: {sse_id}\ndata: {json.dumps(body)}\n\n".encode()


_DONE_BODY = {
    "type": "done",
    "phase": "succeeded",
    "response": "hello",
    "model": "m",
    "duration_ms": 1,
    "usage": {
        "prompt_tokens": 0,
        "completion_tokens": 0,
        "total_tokens": 0,
        "cached_input_tokens": 0,
    },
}
_CANCELLED_STREAM_BODY = {
    "type": "cancelled",
    "phase": "cancelled",
    "turn_id": 42,
    "reason": "user_cancel",
    "partial_message_id": None,
}


def _sse_resp(body: bytes | httpx.AsyncByteStream) -> httpx.Response:
    headers = {"content-type": "text/event-stream"}
    if isinstance(body, bytes):
        return httpx.Response(200, headers=headers, content=body)
    return httpx.Response(200, headers=headers, stream=body)


async def _submit_and_wait(app: RatatoskrApp, pilot, content: str) -> None:
    """Type content into the input and submit; wait for worker to finish."""
    inp = app.query_one("#prompt", Input)
    inp.value = content
    await inp.action_submit()
    await pilot.pause()  # let the Input.Submitted message dispatch
    # Poll until the worker resolves (state returns to idle)
    for _ in range(100):
        if app.state == "idle" and app.stream_worker is not None:
            return
        await pilot.pause(0.02)


class TestStreamTurnWorker:
    @respx.mock
    async def test_happy_text_done_renders_markdown(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """happy_text_done_renders_markdown [happy,tracer]: …"""
        stream = (

            _sse_chunk("42:1", {"type": "text", "content": "hello"})

            + _sse_chunk("42:2", _DONE_BODY)

        )
        respx.post(

            "https://w.example/sessions/s-1existing/messages"

        ).mock(return_value=_sse_resp(stream))

        writes = _spy_writes(monkeypatch)

        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            await _submit_and_wait(app, pilot, "hi")
            assert app.state == "idle"
            # Streamed delta + done label + rule + markdown render
            assert any(w == "hello" for w in writes)
            assert any("[done]" in str(w) for w in writes)
            # The post-Done markdown render uses rich Rule + Markdown — non-string writes.
            # INV-005: BOTH separator (Rule) AND markdown render must be present in non-raw.
            from rich.markdown import Markdown
            from rich.rule import Rule
            assert any(isinstance(w, Markdown) for w in writes)
            assert any(isinstance(w, Rule) for w in writes)

    @respx.mock
    async def test_raw_flag_skips_markdown_render(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """raw_flag_skips_markdown_render [trace]: …"""
        stream = (

            _sse_chunk("42:1", {"type": "text", "content": "hi"})

            + _sse_chunk("42:2", _DONE_BODY)

        )
        respx.post(

            "https://w.example/sessions/s-1existing/messages"

        ).mock(return_value=_sse_resp(stream))
        writes = _spy_writes(monkeypatch)
        app = _resolved_app(_args_existing(raw=True))
        async with app.run_test() as pilot:
            await pilot.pause()
            await _submit_and_wait(app, pilot, "x")
            # INV-005: with --raw, NEITHER Rule separator NOR Markdown render appears.
            from rich.markdown import Markdown
            from rich.rule import Rule
            assert not any(isinstance(w, Markdown) for w in writes)
            assert not any(isinstance(w, Rule) for w in writes)

    @respx.mock
    async def test_error_terminal_returns_to_idle(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """error_terminal_returns_to_idle [happy]: …"""
        stream = (

            _sse_chunk("42:1", {"type": "text", "content": "x"})

            + _sse_chunk(
            "42:2",
            {
                "type": "error",
                "phase": "failed",
                "error_code": "llm_output_invalid",
                "message": "boom",
            },
        )

        )
        respx.post(

            "https://w.example/sessions/s-1existing/messages"

        ).mock(return_value=_sse_resp(stream))
        writes = _spy_writes(monkeypatch)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            await _submit_and_wait(app, pilot, "x")
            assert app.state == "idle"
            assert any("[error]" in str(w) for w in writes)

    @respx.mock
    async def test_cancelled_terminal_returns_to_idle(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """cancelled_terminal_returns_to_idle [happy]: …"""
        stream = (

            _sse_chunk("42:1", {"type": "text", "content": "x"})

            + _sse_chunk("42:2", _CANCELLED_STREAM_BODY)

        )
        respx.post(

            "https://w.example/sessions/s-1existing/messages"

        ).mock(return_value=_sse_resp(stream))
        writes = _spy_writes(monkeypatch)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            await _submit_and_wait(app, pilot, "x")
            assert app.state == "idle"
            assert any("[cancelled]" in str(w) for w in writes)

    @respx.mock
    async def test_active_turn_id_set_on_first_event(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """active_turn_id_set_on_first_event [trace]: …"""
        # Use a gated stream: yield first event, then hold, so we can inspect mid-stream
        first = _sse_chunk("42:1", {"type": "text", "content": "x"})
        gate = asyncio.Event()

        class _GatedAfterFirst(httpx.AsyncByteStream):
            async def __aiter__(self):
                yield first
                await gate.wait()
                yield _sse_chunk("42:2", _DONE_BODY)

            async def aclose(self) -> None:
                return None

        respx.post("https://w.example/sessions/s-1existing/messages").mock(
            return_value=_sse_resp(_GatedAfterFirst())
        )

        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            inp = app.query_one("#prompt", Input)
            inp.value = "x"
            await inp.action_submit()
            # Wait for first event to be processed (active_turn_id set)
            for _ in range(50):
                if app.active_turn_id is not None:
                    break
                await pilot.pause(0.02)
            assert app.active_turn_id == 42
            # Release the gate so the worker can finish and the app can shut down cleanly
            gate.set()
            for _ in range(50):
                if app.state == "idle":
                    break
                await pilot.pause(0.02)

    @respx.mock
    async def test_sse_connect_failed_returns_to_idle(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """sse_connect_failed_returns_to_idle [error]: …"""
        respx.post("https://w.example/sessions/s-1existing/messages").mock(
            return_value=httpx.Response(404, json={"error": "session_not_found"})
        )
        writes = _spy_writes(monkeypatch)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            await _submit_and_wait(app, pilot, "x")
            assert app.state == "idle"
            assert any("[sse_connect_failed]" in str(w) for w in writes)
            assert app.return_value is None  # app NOT exited per INV-008

    @respx.mock
    async def test_connection_dropped_returns_to_idle(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """connection_dropped_returns_to_idle [error]: …"""

        class _DropAfter(httpx.AsyncByteStream):
            async def __aiter__(self):
                yield _sse_chunk("42:1", {"type": "text", "content": "x"})
                raise httpx.RemoteProtocolError("drop")

            async def aclose(self) -> None:
                return None

        respx.post("https://w.example/sessions/s-1existing/messages").mock(
            return_value=_sse_resp(_DropAfter())
        )
        writes = _spy_writes(monkeypatch)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            await _submit_and_wait(app, pilot, "x")
            assert app.state == "idle"
            assert any("[connection_dropped]" in str(w) for w in writes)

    @respx.mock
    async def test_malformed_sse_data_returns_to_idle(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """malformed_sse_data_returns_to_idle [error]: bad-JSON → [malformed_sse_data]; idle."""
        stream = (
            _sse_chunk("42:1", {"type": "text", "content": "x"})
            + b"id: 42:2\ndata: not-json\n\n"
        )
        respx.post(
            "https://w.example/sessions/s-1existing/messages"
        ).mock(return_value=_sse_resp(stream))
        writes = _spy_writes(monkeypatch)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            await _submit_and_wait(app, pilot, "x")
            assert app.state == "idle"
            assert any("[malformed_sse_data]" in str(w) for w in writes)
            assert any("not-json" in str(w) for w in writes)
            # INV-008: mid-session error does NOT exit the app
            assert app.return_value is None

    @respx.mock
    async def test_rendered_event_per_event(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """rendered_event_per_event [trace]: …"""
        chunks = (
            _sse_chunk("42:1", {"type": "worker_phase", "phase": "streaming", "turn_id": 42})
            + _sse_chunk("42:2", {"type": "text", "content": "hi"})
            + _sse_chunk("42:3", _DONE_BODY)
        )
        respx.post(

            "https://w.example/sessions/s-1existing/messages"

        ).mock(return_value=_sse_resp(chunks))

        from ratatoskr import tui as tui_mod

        call_count = 0
        original = tui_mod._render_event_to_log

        def spy(event, *, log, raw):
            nonlocal call_count
            call_count += 1
            return original(event, log=log, raw=raw)

        monkeypatch.setattr(tui_mod, "_render_event_to_log", spy)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            await _submit_and_wait(app, pilot, "x")
            assert call_count == 3


class TestActionInterrupt:
    @respx.mock
    async def test_idle_ctrl_c_exits_zero(self) -> None:
        """idle_ctrl_c_exits_zero [happy,tracer]: state=idle; ctrl+c → exit(0)."""
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            assert app.state == "idle"
            await pilot.press("ctrl+c")
            await pilot.pause()
        assert app.return_value == 0

    @respx.mock
    async def test_streaming_first_ctrl_c_cancels(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """streaming_first_ctrl_c_cancels [scenario,tracer]: …"""
        # Stream that yields one text event (sets active_turn_id) then waits forever
        first_chunk = _sse_chunk("42:1", {"type": "text", "content": "x"})
        gate = asyncio.Event()

        class _GatedAfterFirst(httpx.AsyncByteStream):
            async def __aiter__(self):
                yield first_chunk
                await gate.wait()

            async def aclose(self) -> None:
                return None

        respx.post("https://w.example/sessions/s-1existing/messages").mock(
            return_value=_sse_resp(_GatedAfterFirst())
        )
        cancel_observed = asyncio.Event()

        def cancel_handler(req: httpx.Request) -> httpx.Response:
            cancel_observed.set()
            return httpx.Response(200, json=_CANCEL_OK_RESP)

        cancel_route = respx.post("https://w.example/sessions/s-1existing/turns/42/cancel").mock(
            side_effect=cancel_handler
        )

        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            inp = app.query_one("#prompt", Input)
            inp.value = "go"
            await inp.action_submit()
            await pilot.pause()
            # Wait for active_turn_id to be set (first event consumed)
            for _ in range(50):
                if app.active_turn_id == 42:
                    break
                await pilot.pause(0.02)
            assert app.active_turn_id == 42
            assert app.state == "streaming"
            await pilot.press("ctrl+c")
            # Wait for cancel POST to land
            for _ in range(50):
                if cancel_observed.is_set():
                    break
                await pilot.pause(0.02)
            assert cancel_route.call_count == 1
            assert app.state == "cancelling"
            from textual.widgets import Static

            hint_widget = app.query_one("#hint", Static)
            assert str(hint_widget.render()) == RatatoskrApp.HINT_CANCELLING
            # Release the gate so the stream worker can finish cleanly during teardown
            gate.set()

    @respx.mock
    async def test_streaming_no_turn_id_force_exits(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """streaming_no_turn_id_force_exits [scenario]: …"""
        cancel_route = respx.post("https://w.example/sessions/s-1existing/turns/0/cancel").mock(
            return_value=httpx.Response(200, json=_CANCEL_OK_RESP)
        )
        # Stream that hangs forever (no events to set active_turn_id)
        gate = asyncio.Event()

        class _NeverYields(httpx.AsyncByteStream):
            async def __aiter__(self):
                await gate.wait()
                if False:
                    yield b""

            async def aclose(self) -> None:
                return None

        respx.post("https://w.example/sessions/s-1existing/messages").mock(
            return_value=_sse_resp(_NeverYields())
        )

        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            inp = app.query_one("#prompt", Input)
            inp.value = "go"
            await inp.action_submit()
            await pilot.pause()
            assert app.state == "streaming"
            assert app.active_turn_id is None
            # Capture worker reference + spy on its .cancel() before ctrl+c
            worker_ref = app.stream_worker
            assert worker_ref is not None
            cancel_calls: list = []
            original_cancel = type(worker_ref).cancel
            monkeypatch.setattr(
                type(worker_ref),
                "cancel",
                lambda self: (cancel_calls.append(self), original_cancel(self))[-1],
            )
            await pilot.press("ctrl+c")
            await pilot.pause()
            gate.set()  # let the gated stream resolve so teardown is clean
        assert app.return_value == 3
        assert cancel_route.call_count == 0
        # action_interrupt MUST cancel the stream worker on the no-active_turn_id force-exit path
        assert worker_ref in cancel_calls

    @respx.mock
    async def test_cancelling_second_ctrl_c_force_exits(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """cancelling_second_ctrl_c_force_exits [scenario]: …"""
        # Set up a real live stream worker (gated, hangs forever) so we can
        # observe action_interrupt's cancel() call on the second-Ctrl-C path.
        monkeypatch.setattr(RatatoskrApp, "_stream_turn_worker", _noop_worker)
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            inp = app.query_one("#prompt", Input)
            inp.value = "go"
            await inp.action_submit()
            await pilot.pause()
            assert app.stream_worker is not None
            app.state = "cancelling"  # bypass the natural transition for the test
            worker_ref = app.stream_worker
            cancel_calls: list = []
            original_cancel = type(worker_ref).cancel
            monkeypatch.setattr(
                type(worker_ref),
                "cancel",
                lambda self: (cancel_calls.append(self), original_cancel(self))[-1],
            )
            await pilot.press("ctrl+c")
            await pilot.pause()
        assert app.return_value == 3
        # Second-Ctrl-C in cancelling state MUST cancel the in-flight worker
        assert worker_ref in cancel_calls

    @respx.mock
    async def test_cancel_failed_swallowed(self) -> None:
        """cancel_failed_swallowed [scenario]: …"""
        first_chunk = _sse_chunk("42:1", {"type": "text", "content": "x"})
        stream_gate = asyncio.Event()

        class _GatedAfterFirst(httpx.AsyncByteStream):
            async def __aiter__(self):
                yield first_chunk
                await stream_gate.wait()

            async def aclose(self) -> None:
                return None

        respx.post("https://w.example/sessions/s-1existing/messages").mock(
            return_value=_sse_resp(_GatedAfterFirst())
        )
        cancel_observed = asyncio.Event()

        def cancel_handler(req: httpx.Request) -> httpx.Response:
            cancel_observed.set()
            return httpx.Response(500, content=b"boom")

        respx.post("https://w.example/sessions/s-1existing/turns/42/cancel").mock(
            side_effect=cancel_handler
        )

        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            inp = app.query_one("#prompt", Input)
            inp.value = "go"
            await inp.action_submit()
            await pilot.pause()
            for _ in range(50):
                if app.active_turn_id == 42:
                    break
                await pilot.pause(0.02)
            await pilot.press("ctrl+c")
            for _ in range(50):
                if cancel_observed.is_set():
                    break
                await pilot.pause(0.02)
            # Give _cancel_via_sse time to write the [cancel_failed] line
            await pilot.pause(0.05)
            log = app.query_one("#transcript", RichLog)
            rendered = "\n".join(str(strip.text) for strip in log.lines)
            assert "[cancel_failed]" in rendered
            assert app.state == "cancelling"
            stream_gate.set()  # let stream finish for teardown


class TestActionQuit:
    @respx.mock
    async def test_idle_ctrl_d_exits_zero(self) -> None:
        """idle_ctrl_d_exits_zero [happy,tracer]: state=idle; ctrl+d → exit(0)."""
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            await pilot.press("ctrl+d")
            await pilot.pause()
        assert app.return_value == 0

    @respx.mock
    async def test_streaming_ctrl_d_force_exits(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """streaming_ctrl_d_force_exits [scenario]: …"""
        cancel_route = respx.post("https://w.example/sessions/s-1existing/turns/42/cancel").mock(
            return_value=httpx.Response(200, json=_CANCEL_OK_RESP)
        )
        first_chunk = _sse_chunk("42:1", {"type": "text", "content": "x"})
        gate = asyncio.Event()

        class _GatedAfterFirst(httpx.AsyncByteStream):
            async def __aiter__(self):
                yield first_chunk
                await gate.wait()

            async def aclose(self) -> None:
                return None

        respx.post("https://w.example/sessions/s-1existing/messages").mock(
            return_value=_sse_resp(_GatedAfterFirst())
        )
        app = _resolved_app(_args_existing())
        async with app.run_test() as pilot:
            await pilot.pause()
            inp = app.query_one("#prompt", Input)
            inp.value = "go"
            await inp.action_submit()
            await pilot.pause()
            for _ in range(50):
                if app.active_turn_id == 42:
                    break
                await pilot.pause(0.02)
            # Capture worker + spy on cancel before ctrl+d
            worker_ref = app.stream_worker
            assert worker_ref is not None
            cancel_calls: list = []
            original_cancel = type(worker_ref).cancel
            monkeypatch.setattr(
                type(worker_ref),
                "cancel",
                lambda self: (cancel_calls.append(self), original_cancel(self))[-1],
            )
            await pilot.press("ctrl+d")
            await pilot.pause()
            gate.set()
        assert app.return_value == 0
        assert cancel_route.call_count == 0
        # POST-002: Ctrl-D MUST cancel the in-flight stream worker (abandon-and-exit)
        assert worker_ref in cancel_calls


from ratatoskr.tui import run_tui  # noqa: E402


class TestResolveThenRun:
    """Tests at the `_resolve_then_run` layer — pre-`App.run()` session
    resolution + AsyncClient ownership + stderr error routing per issue #6.
    """

    @respx.mock
    def test_happy_new_session_resolve(self, monkeypatch: pytest.MonkeyPatch) -> None:
        """happy_new_session_resolve [happy]: --new path through _resolve_then_run.

        Verifies POST /sessions count + SessionInfo propagation to RatatoskrApp's
        pre-resolved state (session_id / agent_id / client). The corresponding
        TestAppMount.test_happy_new_session_mount uses _resolved_app and bypasses
        _resolve_then_run entirely; this test exercises the production resolve
        path with a real POST /sessions mock.
        """
        sessions_route = respx.post("https://w.example/sessions").mock(
            return_value=httpx.Response(201, json=_CREATE_OK_RESP)
        )
        snapshot: dict = {}

        async def capture_run_async(self, *a, **kw):
            snapshot["session_id"] = self.session_id
            snapshot["agent_id"] = self.agent_id
            snapshot["client"] = self.client
            snapshot["client_open"] = not self.client.is_closed
            return 0

        monkeypatch.setattr(RatatoskrApp, "run_async", capture_run_async)
        rc = run_tui(_args_new())
        assert rc == 0
        # Exactly one POST /sessions invocation by _resolve_then_run
        assert sessions_route.call_count == 1
        # SessionInfo fields propagated into the constructed App
        assert snapshot["session_id"] == "s-new12345"
        assert snapshot["agent_id"] == "mimir"
        assert snapshot["client"] is not None
        assert snapshot["client_open"] is True

    @respx.mock
    def test_happy_new_with_end_user_id_resolve(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """happy_new_with_end_user_id_resolve [happy]: args.end_user_id threads into POST body.

        Issue #5 amends #4: _resolve_then_run's create_session call now forwards
        args.end_user_id (renamed from the contract's _mount target, since #6
        moved session resolution out of on_mount into _resolve_then_run).
        """
        import json as _json

        sessions_route = respx.post("https://w.example/sessions").mock(
            return_value=httpx.Response(201, json=_CREATE_OK_RESP)
        )

        async def fake_run_async(self, *a, **kw):
            return 0

        monkeypatch.setattr(RatatoskrApp, "run_async", fake_run_async)
        rc = run_tui(_args_new(end_user_id="alice"))
        assert rc == 0
        assert sessions_route.call_count == 1
        body = _json.loads(sessions_route.calls[0].request.content)
        assert body == {"agent_id": "mimir", "end_user_id": "alice"}

    @respx.mock
    def test_user_agent_header_sent(self, monkeypatch: pytest.MonkeyPatch) -> None:
        """user_agent_header_sent [trace]: outbound requests carry the ratatoskr User-Agent.

        Worldtree-dev (althing 2026-05-23) requested consumers send `User-Agent:
        ratatoskr/<version> (<contact>)` so server logs can distinguish ratatoskr
        traffic from other consumers.
        """
        sessions_route = respx.post("https://w.example/sessions").mock(
            return_value=httpx.Response(201, json=_CREATE_OK_RESP)
        )

        async def fake_run_async(self, *a, **kw):
            return 0

        monkeypatch.setattr(RatatoskrApp, "run_async", fake_run_async)
        rc = run_tui(_args_new())
        assert rc == 0
        ua = sessions_route.calls[0].request.headers["User-Agent"]
        assert ua.startswith("ratatoskr/")
        assert "vh@phasefinal.com" in ua

    @respx.mock
    def test_alt_screen_never_opens_on_resolve_error(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """alt_screen_never_opens_on_resolve_error [trace]: 404 → run_tui=12; run_async unhit.

        Directly probes INV-001: session resolution failures MUST short-circuit
        BEFORE the alt-screen opens.
        """
        respx.post("https://w.example/sessions").mock(
            return_value=httpx.Response(404, json={"error": "unknown_agent_id"})
        )
        sentinel_called = False

        async def sentinel(self, *a, **kw):
            nonlocal sentinel_called
            sentinel_called = True
            return 0

        monkeypatch.setattr(RatatoskrApp, "run_async", sentinel)
        rc = run_tui(_args_new())
        assert rc == 12
        assert not sentinel_called

    @respx.mock
    def test_agent_not_found_on_resolve(
        self, capsys: pytest.CaptureFixture[str]
    ) -> None:
        """agent_not_found_on_resolve [error]: --new + 404 → stderr [agent_not_found]; exit 12."""
        respx.post("https://w.example/sessions").mock(
            return_value=httpx.Response(404, json={"error": "unknown_agent_id"})
        )
        rc = run_tui(_args_new())
        err = capsys.readouterr().err
        assert rc == 12
        assert "[agent_not_found]" in err
        assert "agent_id=mimir" in err

    @respx.mock
    def test_session_api_failed_on_resolve(
        self, capsys: pytest.CaptureFixture[str]
    ) -> None:
        """session_api_failed_on_resolve [error]: --new + 500 → [session_api_failed] stderr."""
        respx.post("https://w.example/sessions").mock(
            return_value=httpx.Response(500, content=b"server error")
        )
        rc = run_tui(_args_new())
        err = capsys.readouterr().err
        assert rc == 20
        assert "[session_api_failed]" in err
        assert "status=500" in err

    @respx.mock
    def test_network_error_on_resolve(
        self, capsys: pytest.CaptureFixture[str]
    ) -> None:
        """network_error_on_resolve [error]: --new + ConnectError → [network_error] stderr."""
        respx.post("https://w.example/sessions").mock(side_effect=httpx.ConnectError("down"))
        rc = run_tui(_args_new())
        err = capsys.readouterr().err
        assert rc == 21
        assert "[network_error]" in err
        assert "ConnectError" in err

    @respx.mock
    def test_stderr_label_format_matches_cli(
        self, capsys: pytest.CaptureFixture[str]
    ) -> None:
        """stderr_label_format_matches_cli [trace]: cli._amain and _resolve_then_run produce
        identical stderr lines for AgentNotFound (INV-006).
        """
        # Re-fetch cli's ParsedArgs from the current module state — test_cli's
        # `importlib.reload(ratatoskr.cli)` rebinds the class, so the top-of-file
        # `from ratatoskr.cli import ParsedArgs` may now refer to a stale class.
        from ratatoskr import cli as cli_mod

        respx.post("https://w.example/sessions").mock(
            return_value=httpx.Response(404, json={"error": "unknown_agent_id"})
        )
        cli_args = cli_mod.ParsedArgs(
            send_content="x",
            session_id=None,
            new=True,
            agent_id="mimir",
            api_key="k",
            server_url="https://w.example",
            raw=False,
        )
        # Drive cli._amain's error path (--send mode)
        cli_rc = asyncio.run(cli_mod._amain(cli_args))
        cli_err = capsys.readouterr().err
        # Drive _resolve_then_run's error path (TUI mode); _args_new() uses the
        # pre-reload ParsedArgs which still matches tui.run_tui's isinstance check.
        tui_rc = run_tui(_args_new())
        tui_err = capsys.readouterr().err
        # Same exit code, same verbatim stderr line.
        assert cli_rc == 12
        assert tui_rc == 12
        assert cli_err == tui_err
        assert cli_err == "[agent_not_found] agent_id=mimir\n"

    def test_client_open_after_resolve(self, monkeypatch: pytest.MonkeyPatch) -> None:
        """client_open_after_resolve [trace]: app.client is open at the time run_async runs."""
        snapshot: dict = {}

        async def capture_run_async(self, *a, **kw):
            snapshot["client_is"] = self.client
            snapshot["closed_during_run"] = self.client.is_closed
            return 0

        monkeypatch.setattr(RatatoskrApp, "run_async", capture_run_async)
        rc = run_tui(_args_existing())
        assert rc == 0
        assert snapshot["client_is"] is not None
        assert snapshot["closed_during_run"] is False

    def test_client_lifetime_owned_by_run_tui(self, monkeypatch: pytest.MonkeyPatch) -> None:
        """client_lifetime_owned_by_run_tui [trace]: open during run_async, closed after run_tui.

        Probes INV-002: the App is a consumer of an externally-owned client;
        the async-with in run_tui closes it, not on_unmount.
        """
        snapshot: dict = {}

        async def capture_run_async(self, *a, **kw):
            # During run_async (the alt-screen lifetime) the client is open.
            snapshot["client"] = self.client
            snapshot["closed_during_run"] = self.client.is_closed
            return 0

        monkeypatch.setattr(RatatoskrApp, "run_async", capture_run_async)
        rc = run_tui(_args_existing())
        assert rc == 0
        client = snapshot["client"]
        assert client is not None
        # Open while the app was running; closed by run_tui's async-with after.
        assert snapshot["closed_during_run"] is False
        assert client.is_closed is True

    def test_run_tui_closes_client_on_app_exit(
        self, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """run_tui_closes_client_on_app_exit: async-with closes client after app.run_async ret."""
        seen_clients: list[httpx.AsyncClient] = []

        async def fake_run_async(self, *a, **kw):
            seen_clients.append(self.client)
            return 0

        monkeypatch.setattr(RatatoskrApp, "run_async", fake_run_async)
        rc = run_tui(_args_existing())
        assert rc == 0
        assert len(seen_clients) == 1
        # After run_tui returns, the client should be closed by the async-with
        assert seen_clients[0].is_closed

    async def test_on_unmount_does_not_close_client(self) -> None:
        """on_unmount narrowed [trace]: probes INV-002 from the on_unmount side.

        The complementary check to test_client_lifetime_owned_by_run_tui (which
        patches run_async and so never exercises on_unmount). Here we DO run the
        real on_unmount via Pilot ctrl+d → app teardown, and assert the client
        is still open afterward (close site is run_tui's async-with, which is
        NOT entered in this Pilot-driven test).
        """
        client = httpx.AsyncClient(
            base_url="https://w.example",
            headers={"Authorization": "Bearer k"},
            timeout=httpx.Timeout(connect=10.0, read=None, write=10.0, pool=10.0),
        )
        app = RatatoskrApp(
            _args_existing(),
            session_id="s-1existing",
            agent_id=None,
            client=client,
        )
        async with app.run_test() as pilot:
            await pilot.pause()
            assert client.is_closed is False
            await pilot.press("ctrl+d")
            await pilot.pause()
        # After app.run_test() teardown, on_unmount has fired. Per INV-002 the
        # client MUST still be open — only run_tui's async-with closes it.
        assert client.is_closed is False
        await client.aclose()  # test-side cleanup


class TestRunTui:
    def test_happy_returns_zero_on_quit(self, monkeypatch: pytest.MonkeyPatch) -> None:
        """happy_returns_zero_on_quit [happy,tracer]: run_tui propagates app.run_async exit code."""
        captured: list[ParsedArgs] = []

        async def fake_run_async(self, *a, **kw):
            captured.append(self.args)
            return 0

        monkeypatch.setattr(RatatoskrApp, "run_async", fake_run_async)
        rc = run_tui(_args_existing())
        assert rc == 0
        assert len(captured) == 1
        assert captured[0].send_content is None

    def test_precondition_send_content_none(self) -> None:
        """precondition_send_content_none [adversarial]: …"""
        bad_args = ParsedArgs(
            send_content="x",  # PRE-001 violation
            session_id="s-1",
            new=False,
            agent_id=None,
            api_key="k",
            server_url="https://w.example",
            raw=False,
        )
        with pytest.raises(AssertionError):
            run_tui(bad_args)