"""Tests for incident lifecycle: auto-resolve, orphan detection, timestamp parsing."""
from __future__ import annotations

import json
import sys
import time
from pathlib import Path

import pytest

# Observer lives outside the control-plane package; add scripts/ to path.
sys.path.insert(0, str(Path(__file__).parent.parent.parent.parent / "scripts"))
from observer.observer import Observer, _parse_ts, _atomic_write_json


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def _make_observer(tmp_path: Path) -> Observer:
    """Return an Observer with all runtime paths redirected to tmp_path."""
    import observer.observer as obs_mod

    world = tmp_path / "world"
    state = tmp_path / "state"
    events = tmp_path / "events"
    logs = tmp_path / "logs"
    repo = tmp_path / "repo"

    for d in (world, state, events, logs, repo / "inventory", repo / "hosts"):
        d.mkdir(parents=True, exist_ok=True)

    # Minimal topology so inventory isn't empty (avoids prune-guard early-return)
    (repo / "inventory" / "topology.yaml").write_text(
        "nodes:\n  vps:\n    roles: [control-plane]\n    connectivity: {}\n"
    )

    original_world = obs_mod.WORLD_DIR
    original_state = obs_mod.STATE_DIR
    original_events = obs_mod.EVENTS_DIR
    original_logs = obs_mod.LOGS_DIR
    original_inventory = obs_mod.INVENTORY_TOPOLOGY
    original_repo = obs_mod.REPO_ROOT

    obs_mod.WORLD_DIR = world
    obs_mod.STATE_DIR = state
    obs_mod.EVENTS_DIR = events
    obs_mod.LOGS_DIR = logs
    obs_mod.INVENTORY_TOPOLOGY = repo / "inventory" / "topology.yaml"
    obs_mod.REPO_ROOT = repo

    obs = Observer()

    # Restore module-level constants (monkeypatching at module level is sufficient
    # for the Observer instance which captures paths at construction time via globals)
    obs_mod.WORLD_DIR = original_world
    obs_mod.STATE_DIR = original_state
    obs_mod.EVENTS_DIR = original_events
    obs_mod.LOGS_DIR = original_logs
    obs_mod.INVENTORY_TOPOLOGY = original_inventory
    obs_mod.REPO_ROOT = original_repo

    return obs


def _make_observer_simple(tmp_path: Path):
    """Return an Observer instance and patch its world_state in-place."""
    import observer.observer as obs_mod

    world = tmp_path / "world"
    state = tmp_path / "state"
    events = tmp_path / "events"
    logs = tmp_path / "logs"
    repo = tmp_path / "repo"

    for d in (world, state, events, logs, repo / "inventory", repo / "hosts"):
        d.mkdir(parents=True, exist_ok=True)

    (repo / "inventory" / "topology.yaml").write_text(
        "nodes:\n  vps:\n    roles: [control-plane]\n    connectivity: {}\n"
    )

    # Patch before construction
    obs_mod.WORLD_DIR = world
    obs_mod.STATE_DIR = state
    obs_mod.EVENTS_DIR = events
    obs_mod.LOGS_DIR = logs
    obs_mod.INVENTORY_TOPOLOGY = repo / "inventory" / "topology.yaml"
    obs_mod.REPO_ROOT = repo

    obs = Observer()
    return obs


# ---------------------------------------------------------------------------
# 1. _parse_ts — timestamp normalisation
# ---------------------------------------------------------------------------

def test_parse_ts_int():
    ts = int(time.time()) - 3600
    assert abs(_parse_ts(ts) - ts) < 1


def test_parse_ts_float():
    ts = time.time() - 100.5
    assert abs(_parse_ts(ts) - ts) < 0.01


def test_parse_ts_iso_string():
    # ISO format as emitted by events.py / stability-agent
    from datetime import datetime, timezone
    iso = "2026-06-01T00:03:22Z"
    expected = datetime(2026, 6, 1, 0, 3, 22, tzinfo=timezone.utc).timestamp()
    result = _parse_ts(iso)
    assert result > 0
    assert isinstance(result, float)
    assert abs(result - expected) < 1


def test_parse_ts_none_returns_zero():
    assert _parse_ts(None) == 0.0


def test_parse_ts_garbage_returns_zero():
    assert _parse_ts("not-a-date") == 0.0


def test_parse_ts_zero_int():
    assert _parse_ts(0) == 0.0


# ---------------------------------------------------------------------------
# 2. Lifecycle: service_healthy event resolves linked incident
# ---------------------------------------------------------------------------

def test_service_healthy_resolves_active_incident(tmp_path):
    obs = _make_observer_simple(tmp_path)
    inc_id = "inc-111-vps-outline"
    obs.world_state["services"]["vps/outline"] = {
        "node": "vps", "service": "outline",
        "status": "unhealthy", "last_check": None,
        "incident_id": inc_id,
    }
    obs.world_state["incidents"][inc_id] = {
        "id": inc_id, "node": "vps", "service": "outline",
        "status": "active", "trigger_type": "service_unhealthy",
        "started_at": int(time.time()) - 600,
        "last_occurrence": int(time.time()) - 600,
        "occurrence_count": 1, "events": [],
    }

    obs.process_event({
        "type": "service_healthy",
        "node": "vps",
        "service": "outline",
        "severity": "info",
        "timestamp": int(time.time()),
        "payload": {},
    })

    assert obs.world_state["services"]["vps/outline"]["status"] == "healthy"
    assert obs.world_state["services"]["vps/outline"]["incident_id"] is None
    assert obs.world_state["incidents"][inc_id]["status"] == "resolved"


def test_service_healthy_does_not_resolve_other_incidents(tmp_path):
    """service_healthy for service A must not touch incident for service B."""
    obs = _make_observer_simple(tmp_path)
    inc_b = "inc-222-vps-supervisor"
    obs.world_state["services"]["vps/supervisor"] = {
        "node": "vps", "service": "supervisor",
        "status": "unhealthy", "last_check": None,
        "incident_id": inc_b,
    }
    obs.world_state["incidents"][inc_b] = {
        "id": inc_b, "status": "active",
        "last_occurrence": int(time.time()) - 300,
    }

    obs.process_event({
        "type": "service_healthy",
        "node": "vps",
        "service": "outline",   # different service
        "severity": "info",
        "timestamp": int(time.time()),
        "payload": {},
    })

    assert obs.world_state["incidents"][inc_b]["status"] == "active"


# ---------------------------------------------------------------------------
# 3. _prune_stale_world: healthy-service-linked incident → immediate resolve
# ---------------------------------------------------------------------------

def test_prune_resolves_healthy_linked_incident(tmp_path):
    """If a service is healthy but still points at an active incident, resolve it."""
    obs = _make_observer_simple(tmp_path)
    inc_id = "inc-333-vps-outline"
    obs.world_state["services"]["vps/outline"] = {
        "node": "vps", "service": "outline",
        "status": "healthy",          # <-- healthy but incident_id still set
        "last_check": None,
        "incident_id": inc_id,
    }
    obs.world_state["incidents"][inc_id] = {
        "id": inc_id, "status": "active",
        "started_at": int(time.time()) - 7200,
        "last_occurrence": int(time.time()) - 7200,
    }

    obs._prune_stale_world()

    assert obs.world_state["services"]["vps/outline"]["incident_id"] is None
    assert obs.world_state["incidents"][inc_id]["status"] == "resolved"


def test_prune_resolves_healthy_linked_incident_iso_timestamp(tmp_path):
    """Healthy-linked incident with ISO-string last_occurrence must still resolve."""
    obs = _make_observer_simple(tmp_path)
    inc_id = "inc-444-vps-outline"
    obs.world_state["services"]["vps/outline"] = {
        "node": "vps", "service": "outline",
        "status": "healthy", "last_check": None, "incident_id": inc_id,
    }
    obs.world_state["incidents"][inc_id] = {
        "id": inc_id, "status": "active",
        "last_occurrence": "2026-06-01T00:03:22Z",  # ISO string from events.py
    }

    obs._prune_stale_world()   # must not raise TypeError

    assert obs.world_state["incidents"][inc_id]["status"] == "resolved"


# ---------------------------------------------------------------------------
# 4. _prune_stale_world: orphaned incident (no service link) → resolve after 5 min
# ---------------------------------------------------------------------------

def test_prune_resolves_orphaned_incident_old_enough(tmp_path):
    """Orphaned active incident older than 5 min must be auto-resolved."""
    obs = _make_observer_simple(tmp_path)
    inc_id = "inc-555-vps-supervisor"
    # No service entry links to this incident
    obs.world_state["incidents"][inc_id] = {
        "id": inc_id, "status": "active", "node": "vps", "service": "supervisor",
        "last_occurrence": int(time.time()) - 400,   # 6.7 min ago
    }

    obs._prune_stale_world()

    assert obs.world_state["incidents"][inc_id]["status"] == "resolved"


def test_prune_does_not_resolve_orphaned_incident_too_recent(tmp_path):
    """Orphaned incident younger than 5 min must stay active (guard against race)."""
    obs = _make_observer_simple(tmp_path)
    inc_id = "inc-666-vps-supervisor"
    obs.world_state["incidents"][inc_id] = {
        "id": inc_id, "status": "active",
        "last_occurrence": int(time.time()) - 60,   # 1 min ago — within guard
    }

    obs._prune_stale_world()

    assert obs.world_state["incidents"][inc_id]["status"] == "active"


def test_prune_resolves_orphaned_incident_iso_timestamp(tmp_path):
    """Orphaned incident with ISO-string last_occurrence must resolve correctly."""
    obs = _make_observer_simple(tmp_path)
    inc_id = "inc-777-vps-outline"
    # ISO timestamp well in the past (2026-06-01)
    obs.world_state["incidents"][inc_id] = {
        "id": inc_id, "status": "active",
        "last_occurrence": "2026-06-01T00:03:22Z",
    }

    obs._prune_stale_world()   # must not raise TypeError

    assert obs.world_state["incidents"][inc_id]["status"] == "resolved"


def test_prune_does_not_touch_linked_incident(tmp_path):
    """An active incident still linked from a non-healthy service must stay active."""
    obs = _make_observer_simple(tmp_path)
    inc_id = "inc-888-vps-outline"
    obs.world_state["services"]["vps/outline"] = {
        "node": "vps", "service": "outline",
        "status": "unhealthy",   # <-- still unhealthy
        "last_check": None,
        "incident_id": inc_id,
    }
    obs.world_state["incidents"][inc_id] = {
        "id": inc_id, "status": "active",
        "last_occurrence": int(time.time()) - 3600,
    }

    obs._prune_stale_world()

    assert obs.world_state["incidents"][inc_id]["status"] == "active"


# ---------------------------------------------------------------------------
# 5. 7-day stale incident prune with ISO resolved_at
# ---------------------------------------------------------------------------

def test_prune_removes_old_resolved_incident_iso_resolved_at(tmp_path):
    """Resolved incidents with ISO-string resolved_at older than 7 days must be pruned."""
    obs = _make_observer_simple(tmp_path)
    inc_id = "inc-old-resolved"
    obs.world_state["incidents"][inc_id] = {
        "id": inc_id, "status": "resolved",
        "resolved_at": "2026-05-01T00:00:00Z",  # >7 days before 2026-06-03
    }

    obs._prune_stale_world()

    assert inc_id not in obs.world_state["incidents"]


def test_prune_keeps_recently_resolved_incident(tmp_path):
    """Resolved incidents within 7 days must be kept."""
    obs = _make_observer_simple(tmp_path)
    inc_id = "inc-recent-resolved"
    obs.world_state["incidents"][inc_id] = {
        "id": inc_id, "status": "resolved",
        "resolved_at": time.time() - 86400,  # 1 day ago
    }

    obs._prune_stale_world()

    assert inc_id in obs.world_state["incidents"]