app/backend/tests/flow/test_assistant.py

"""The assistant node: the wiring is its allowlist, and it speaks as it writes."""

import asyncio
import json
from collections.abc import AsyncIterator
from typing import Any

import httpx
import pytest

from fluksio.ai import client
from fluksio.ai import config as ai_config
from fluksio.flow.messages import DType, MessageSpec
from fluksio.flow.nodes.assistant import UNAVAILABLE, AssistantNode, cut
from fluksio.flow.pipeline import Pipeline

PROVIDER = ai_config.AIConfig(api_base="http://llm:11434/v1", api_key="k", model="m")


def _call(name: str, value: Any) -> dict[str, Any]:
    arguments = json.dumps({"value": value})
    return {"id": name, "function": {"name": name, "arguments": arguments}}


def _node() -> AssistantNode:
    node = AssistantNode(
        requires=[
            MessageSpec(name="unhandled", port="prompt", dtype=DType.STR),
            MessageSpec(name="outdoor", port="outside_temperature", dtype=DType.FLOAT),
        ],
        provides=[
            MessageSpec(name="kitchen_light", dtype=DType.BOOL),
            MessageSpec(
                name="setpoint", port="living_room_setpoint", dtype=DType.FLOAT
            ),
            MessageSpec(name="reply", dtype=DType.STR),
            MessageSpec(name="actions", dtype=DType.LIST),
        ],
    )
    node.assign_flow("voice", "assistant")
    Pipeline([node])
    return node


def _ask(node: AssistantNode, prompt: str) -> dict[str, Any] | None:
    async def scenario() -> dict[str, Any] | None:
        await node.start()
        inputs = {"voice.unhandled": prompt, "voice.outdoor": 7.5}
        return await asyncio.to_thread(node.execute, inputs)

    return asyncio.run(scenario())


def test_a_sentence_is_cut_once_it_ends():
    assert cut("Done. It is 7.5 degr") == (["Done."], "It is 7.5 degr")
    assert cut("Lights off! Anything else? ") == (["Lights off!", "Anything else?"], "")


def test_only_wired_targets_are_tools_a_change_is_confirmed_and_an_answer_streamed(
    monkeypatch: pytest.MonkeyPatch,
):
    log: list[Any] = []
    seen: list[dict[str, Any]] = []
    rounds = iter(
        [
            # The model reaches for a tool nothing is wired to, as well.
            [
                _call("kitchen_light", False),
                _call("delete_flow", "demo"),
                _call("living_room_setpoint", 22),
            ],
            ["It is 7.5", " degrees outside. Wear a ", "jacket."],
        ]
    )

    async def completion(**kwargs: Any) -> AsyncIterator[str | dict[str, Any]]:
        seen.append(kwargs)
        step = next(rounds)
        if isinstance(step[0], dict):
            yield {"role": "assistant", "content": None, "tool_calls": step}
            return
        for piece in step:
            log.append(piece)
            yield piece
        yield {"role": "assistant", "content": "".join(step)}

    monkeypatch.setattr(ai_config, "load", lambda: PROVIDER)
    monkeypatch.setattr(client, "stream_completion", completion)
    monkeypatch.setattr(AssistantNode, "emit", lambda self, values: log.append(values))
    node = _node()

    out = _ask(node, "turn off the kitchen light and make it warmer")

    tools = {tool["function"]["name"] for tool in seen[0]["tools"]}
    assert tools == {"kitchen_light", "living_room_setpoint"}
    system = seen[0]["messages"][0]["content"]
    assert "outside_temperature: 7.5" in system
    assert seen[0]["extra"]["reasoning_effort"] == "none"
    # Set as called, and confirmed without asking the model again.
    assert len(seen) == 1
    assert log == [
        {"kitchen_light": False},
        {"living_room_setpoint": 22.0},
        {"reply": "Kitchen light off, living room setpoint to 22."},
    ]
    assert out is not None
    assert [a["message"] for a in out["voice.actions"]] == [
        "voice.kitchen_light",
        "voice.setpoint",
    ]

    log.clear()
    _ask(node, "what is it like outside")
    # The first sentence is said before the second is written.
    assert log == [
        "It is 7.5",
        " degrees outside. Wear a ",
        {"reply": "It is 7.5 degrees outside."},
        "jacket.",
        {"reply": "Wear a jacket."},
    ]


def test_no_provider_or_one_that_does_not_answer_is_said(
    monkeypatch: pytest.MonkeyPatch,
):
    said: list[dict[str, Any]] = []
    monkeypatch.setattr(AssistantNode, "emit", lambda self, values: said.append(values))

    async def refused(**kwargs: Any) -> AsyncIterator[str | dict[str, Any]]:
        raise httpx.ConnectError("refused")
        yield ""

    monkeypatch.setattr(client, "stream_completion", refused)
    for provider in (None, PROVIDER):
        monkeypatch.setattr(ai_config, "load", lambda provider=provider: provider)
        node = _node()
        _ask(node, "what is the weather tomorrow")
        assert said.pop() == {"reply": UNAVAILABLE}
        assert node._health == "degraded"