"""Read-time liveness safety net + service cascade in the operator UI backend."""
from __future__ import annotations

import json
import sys
import time
from pathlib import Path

sys.path.insert(0, str(Path(__file__).parent.parent / "src"))

import operator_ui


def _setup_world(tmp_path, monkeypatch, nodes, services):
    world = tmp_path / "world"
    world.mkdir(parents=True, exist_ok=True)
    (world / "nodes.json").write_text(json.dumps(nodes))
    (world / "services.json").write_text(json.dumps(services))
    monkeypatch.setattr(operator_ui, "WORLD_DIR", world)


def test_current_nodes_fresh_is_nominal(tmp_path, monkeypatch):
    _setup_world(tmp_path, monkeypatch,
                 {"vps": {"status": "online", "last_seen": time.time() - 30, "roles": []}},
                 {})
    nodes = operator_ui.current_nodes()
    assert nodes[0]["health"] == "nominal"


def test_current_nodes_frozen_online_but_dead_is_error(tmp_path, monkeypatch):
    """The bug: observer wrote 'online' but last_seen is ancient → must be error."""
    _setup_world(tmp_path, monkeypatch,
                 {"chelsty-infra": {"status": "online",
                                    "last_seen": time.time() - 16 * 86400,
                                    "roles": ["remote"]}},
                 {})
    nodes = operator_ui.current_nodes()
    assert nodes[0]["health"] == "error"


def test_current_nodes_stale_is_degraded(tmp_path, monkeypatch):
    _setup_world(tmp_path, monkeypatch,
                 {"piha": {"status": "online", "last_seen": time.time() - 300, "roles": []}},
                 {})
    nodes = operator_ui.current_nodes()
    assert nodes[0]["health"] == "degraded"


def test_service_cascade_dead_node_makes_service_error(tmp_path, monkeypatch):
    """A 'healthy' service on a dead node must read error (cascade, read-time)."""
    _setup_world(
        tmp_path, monkeypatch,
        {"piha": {"status": "online", "last_seen": time.time() - 700, "roles": []}},
        {"piha/vikunja": {"node": "piha", "service": "vikunja", "status": "healthy"}},
    )
    svcs = operator_ui.current_services()
    assert svcs[0]["health"] == "error"


def test_service_cascade_stale_node_makes_service_degraded(tmp_path, monkeypatch):
    _setup_world(
        tmp_path, monkeypatch,
        {"piha": {"status": "online", "last_seen": time.time() - 300, "roles": []}},
        {"piha/vikunja": {"node": "piha", "service": "vikunja", "status": "healthy"}},
    )
    svcs = operator_ui.current_services()
    assert svcs[0]["health"] == "degraded"


def test_service_on_fresh_node_stays_nominal(tmp_path, monkeypatch):
    _setup_world(
        tmp_path, monkeypatch,
        {"vps": {"status": "online", "last_seen": time.time() - 30, "roles": []}},
        {"vps/outline": {"node": "vps", "service": "outline", "status": "healthy"}},
    )
    svcs = operator_ui.current_services()
    assert svcs[0]["health"] == "nominal"