"""A device node: never run by the engine, degraded while its device is away."""

import asyncio
from pathlib import Path

from fluksio.flow.controller import FlowController
from fluksio.flow.devices import presence
from fluksio.flow.messages import DType, MessageSpec
from fluksio.flow.schemas import FlowDef, FlowInput, NodeDef
from fluksio.flow.store import FlowStore


def _controller(tmp_path: Path) -> FlowController:
    store = FlowStore(tmp_path / "flows")
    store.write_flow(
        FlowDef(
            name="hall",
            inputs=[
                FlowInput(spec=MessageSpec(name="level", dtype=DType.INT), initial=50)
            ],
            nodes=[
                NodeDef(
                    id="panel",
                    type="device",
                    params={"device": "wall"},
                    provides=[
                        MessageSpec(name="bell", port="gpio.4", dtype=DType.BOOL)
                    ],
                    requires=[
                        MessageSpec(
                            name="level",
                            port="backlight",
                            dtype=DType.INT,
                            trigger=False,
                        )
                    ],
                ),
                NodeDef(
                    id="ring",
                    type="change",
                    requires=[MessageSpec(name="bell", dtype=DType.BOOL)],
                    provides=[MessageSpec(name="rung", dtype=DType.BOOL)],
                ),
            ],
        )
    )
    return FlowController(store)


def test_the_engine_never_runs_a_device_node(tmp_path: Path) -> None:
    controller = _controller(tmp_path)
    asyncio.run(controller.reload())
    assert controller.issues == []
    node = controller.get_node("hall.panel")
    assert node is not None and node.passive
    ran: list[object] = []
    node.f = lambda **kwargs: ran.append(kwargs)  # type: ignore[method-assign]

    # The message its out port follows changes, and a manual run of the flow.
    controller.publish_message("hall.level", 80)
    controller.run_flow("hall")
    assert ran == []

    # What the device publishes on its in port runs what reads it.
    controller.publish_message("hall.bell", True)
    assert controller.values("hall")["hall.rung"]["value"] is True
    asyncio.run(controller._teardown())


def test_a_device_node_is_degraded_while_its_device_is_away(tmp_path: Path) -> None:
    controller = _controller(tmp_path)

    async def scenario() -> list[tuple[str, str | None]]:
        await controller.reload()
        entry = controller.loaded["hall.panel"]
        seen = [(entry.health, entry.health_detail)]
        presence.opened("wall")
        seen.append((entry.health, entry.health_detail))
        presence.closed("wall")
        seen.append((entry.health, entry.health_detail))
        await controller._teardown()
        # Stopped, it no longer follows the device.
        presence.opened("wall")
        seen.append((entry.health, entry.health_detail))
        presence.closed("wall")
        return seen

    # Degraded, not down: a switched-off panel is a warning, never a fault.
    assert asyncio.run(scenario()) == [
        ("degraded", "Offline"),
        ("ok", None),
        ("degraded", "Offline"),
        ("degraded", "Offline"),
    ]
    presence.forget("wall")


def test_an_offline_device_is_a_warning_not_a_fault(tmp_path: Path) -> None:
    controller = _controller(tmp_path)

    async def scenario() -> list:
        await controller.reload()
        # Past the floor that holds back a device rebooting.
        controller.loaded["hall.panel"].health_since -= 3600
        found = (
            controller.unhealthy_nodes(),
            [e.id for e in controller.unhealthy_nodes(health="degraded")],
            [(i.code, i.advisory) for i in controller.flow_issues("hall")],
        )
        await controller._teardown()
        return list(found)

    assert asyncio.run(scenario()) == [
        [],
        ["hall.panel"],
        [("node_degraded", True)],
    ]