"""Unit tests for AutomationFailuresCheck."""
from __future__ import annotations

from pathlib import Path
from unittest.mock import AsyncMock, MagicMock

import pytest

from ha_diag.checks.automation_failures import AutomationFailuresCheck, _is_trace_failure
from ha_diag.config import Settings
from ha_diag.models import HAEventType, Severity
from ha_diag.storage import Storage


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


def _make_settings(**overrides) -> Settings:
    defaults: dict = {
        "ha_url": "http://test.local:8123",
        "ha_token": "test",
        "node_name": "test-node",
        "location_tag": "test-loc",
        "alert_cooldown_hours": 0.0,
        "automation_failure_threshold": 3,
        "check_interval": 60,
        "check_interval_unavailable": 3600,
    }
    defaults.update(overrides)
    return Settings(**defaults)


def _make_client(states=None, traces_by_id=None, states_error=None):
    client = MagicMock()
    if states_error:
        client.get_states = AsyncMock(side_effect=states_error)
    else:
        client.get_states = AsyncMock(return_value=states or [])

    traces_map = traces_by_id or {}

    async def _get_traces(eid):
        if eid not in traces_map:
            raise Exception(f"404 for {eid}")
        return traces_map[eid]

    client.get_automation_traces = AsyncMock(side_effect=_get_traces)
    return client


def _auto_state(entity_id: str, state: str = "on", friendly_name: str | None = None) -> dict:
    attrs: dict = {}
    if friendly_name:
        attrs["friendly_name"] = friendly_name
    return {"entity_id": entity_id, "state": state, "attributes": attrs}


def _trace(error: str | None = None, state: str = "stopped") -> dict:
    return {
        "run_id": "abc",
        "timestamp": "2026-05-27T10:00:00+00:00",
        "trigger": "state",
        "state": state if error is None else "stopped",
        "error": error,
    }


def _fail(error: str = "Script error") -> dict:
    return _trace(error=error)


def _ok() -> dict:
    return _trace(error=None)


# ---------------------------------------------------------------------------
# _is_trace_failure unit tests
# ---------------------------------------------------------------------------


def test_trace_with_error_is_failure():
    assert _is_trace_failure({"error": "Something went wrong"}) is True


def test_trace_with_state_failed_is_failure():
    assert _is_trace_failure({"state": "failed", "error": None}) is True


def test_trace_with_null_error_is_success():
    assert _is_trace_failure({"error": None, "state": "stopped"}) is False


def test_trace_with_empty_string_error_is_success():
    assert _is_trace_failure({"error": "", "state": "stopped"}) is False


def test_trace_with_no_keys_is_success():
    assert _is_trace_failure({}) is False


# ---------------------------------------------------------------------------
# AutomationFailuresCheck.run() tests
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_no_automations_returns_empty(storage: Storage):
    check = AutomationFailuresCheck(_make_client([]), storage, _make_settings())
    assert await check.run() == []


@pytest.mark.asyncio
async def test_disabled_automation_skipped(storage: Storage):
    states = [_auto_state("automation.morning_lights", state="off")]
    check = AutomationFailuresCheck(_make_client(states, {}), storage, _make_settings())
    assert await check.run() == []


@pytest.mark.asyncio
async def test_automation_with_no_traces_skipped(storage: Storage):
    states = [_auto_state("automation.morning_lights")]
    # _make_client raises exception for missing keys → graceful skip
    check = AutomationFailuresCheck(_make_client(states, {}), storage, _make_settings())
    assert await check.run() == []


@pytest.mark.asyncio
async def test_fewer_traces_than_threshold_skipped(storage: Storage):
    states = [_auto_state("automation.a")]
    traces = {"automation.a": [_fail(), _fail()]}  # 2 failures, threshold=3
    check = AutomationFailuresCheck(_make_client(states, traces), storage, _make_settings())
    assert await check.run() == []


@pytest.mark.asyncio
async def test_all_recent_failed_emits_event(storage: Storage):
    states = [_auto_state("automation.a", friendly_name="Morning Lights")]
    traces = {"automation.a": [_fail("step failed"), _fail("timeout"), _fail("no device")]}
    check = AutomationFailuresCheck(_make_client(states, traces), storage, _make_settings())
    results = await check.run()
    assert len(results) == 1
    r = results[0]
    assert r.event_type == HAEventType.ha_automation_failing
    assert r.severity == Severity.warning
    assert r.payload["entity_id"] == "automation.a"
    assert r.payload["friendly_name"] == "Morning Lights"
    assert r.payload["total_recent_failures"] == 3
    assert len(r.payload["last_failures"]) == 3


@pytest.mark.asyncio
async def test_partial_failures_no_event(storage: Storage):
    states = [_auto_state("automation.a")]
    # 2 failures, 1 success in recent 3 → not all failed
    traces = {"automation.a": [_fail(), _ok(), _fail()]}
    check = AutomationFailuresCheck(_make_client(states, traces), storage, _make_settings())
    assert await check.run() == []


@pytest.mark.asyncio
async def test_cooldown_prevents_duplicate_event(storage: Storage):
    states = [_auto_state("automation.a")]
    traces = {"automation.a": [_fail(), _fail(), _fail()]}
    settings = _make_settings(alert_cooldown_hours=6.0)
    check = AutomationFailuresCheck(_make_client(states, traces), storage, settings)
    r1 = await check.run()
    r2 = await check.run()
    assert len(r1) == 1
    assert r2 == []


@pytest.mark.asyncio
async def test_multiple_failing_automations(storage: Storage):
    states = [_auto_state("automation.a"), _auto_state("automation.b")]
    traces = {
        "automation.a": [_fail(), _fail(), _fail()],
        "automation.b": [_fail(), _fail(), _fail()],
    }
    check = AutomationFailuresCheck(_make_client(states, traces), storage, _make_settings())
    results = await check.run()
    assert len(results) == 2
    eids = {r.payload["entity_id"] for r in results}
    assert eids == {"automation.a", "automation.b"}


@pytest.mark.asyncio
async def test_states_error_returns_empty(storage: Storage):
    check = AutomationFailuresCheck(
        _make_client(states_error=ConnectionError("down")), storage, _make_settings()
    )
    assert await check.run() == []


@pytest.mark.asyncio
async def test_custom_threshold(storage: Storage):
    states = [_auto_state("automation.a")]
    # threshold=2: 2 failures should trigger
    traces = {"automation.a": [_fail(), _fail(), _ok()]}
    settings = _make_settings(automation_failure_threshold=2)
    check = AutomationFailuresCheck(_make_client(states, traces), storage, settings)
    results = await check.run()
    assert len(results) == 1


@pytest.mark.asyncio
async def test_failure_with_state_failed_field(storage: Storage):
    states = [_auto_state("automation.a")]
    traces = {"automation.a": [
        {"run_id": "x", "state": "failed", "error": None, "timestamp": "2026-05-27T10:00:00Z"},
        {"run_id": "y", "state": "failed", "error": None, "timestamp": "2026-05-27T09:00:00Z"},
        {"run_id": "z", "state": "failed", "error": None, "timestamp": "2026-05-27T08:00:00Z"},
    ]}
    check = AutomationFailuresCheck(_make_client(states, traces), storage, _make_settings())
    results = await check.run()
    assert len(results) == 1