"""Alerts API: ownership isolation, filters, and read/resolve mutations.
Alerts are only ever created internally by alert_service (never via a user
POST), so tests seed rows directly through db_session against the same
user_id the HTTP client is authenticated as (looked up via GET /auth/me)."""

from __future__ import annotations

import uuid

import pytest

from app.models.alert import Alert
from app.models.company import Company
from app.models.detected_change import DetectedChange
from app.models.enums import ChangeType, MonitoringRunTrigger, SeverityLevel, SourceType
from app.models.monitoring_run import MonitoringRun
from app.models.snapshot import Snapshot
from app.models.source import Source


def _register_and_login(client) -> tuple[dict[str, str], uuid.UUID]:
    email = f"user-{uuid.uuid4().hex[:12]}@example.com"
    client.post(
        "/api/v1/auth/register",
        json={"email": email, "password": "correct-horse-1", "display_name": "Test User"},
    )
    tokens = client.post(
        "/api/v1/auth/login", json={"email": email, "password": "correct-horse-1"}
    ).json()
    headers = {"Authorization": f"Bearer {tokens['access_token']}"}
    user_id = uuid.UUID(client.get("/api/v1/auth/me", headers=headers).json()["id"])
    return headers, user_id


async def _make_alert(
    db_session,
    user_id: uuid.UUID,
    *,
    severity: SeverityLevel = SeverityLevel.HIGH,
    read: bool = False,
    resolved: bool = False,
) -> Alert:
    company = Company(
        id=uuid.uuid4(), user_id=user_id, name="Acme Mobility", slug=f"acme-{uuid.uuid4().hex[:6]}"
    )
    db_session.add(company)
    await db_session.flush()

    source = Source(
        company_id=company.id,
        source_type=SourceType.WEBSITE,
        name="Website",
        base_url="https://acme.example",
    )
    db_session.add(source)
    await db_session.flush()

    run = MonitoringRun(company_id=company.id, trigger_type=MonitoringRunTrigger.MANUAL)
    db_session.add(run)
    await db_session.flush()

    snapshot = Snapshot(
        company_id=company.id,
        source_id=source.id,
        snapshot_type=source.source_type.value,
        hash="hash1",
        structured_summary={},
        text_summary="",
        monitoring_run_id=run.id,
    )
    db_session.add(snapshot)
    await db_session.flush()

    change = DetectedChange(
        company_id=company.id,
        source_id=source.id,
        monitoring_run_id=run.id,
        current_snapshot_id=snapshot.id,
        change_type=ChangeType.NEW_DOCUMENT,
        raw_diff={},
        significance_score=0.6,
        confidence_score=0.75,
        severity=severity,
        summary="Change detected",
    )
    db_session.add(change)
    await db_session.flush()

    alert = Alert(
        company_id=company.id,
        detected_change_id=change.id,
        user_id=user_id,
        title="New hire announced",
        summary="A new VP of Engineering was announced.",
        why_it_matters="Signals a scaling push.",
        severity=severity,
        confidence=0.75,
        read=read,
        resolved=resolved,
    )
    db_session.add(alert)
    await db_session.commit()
    await db_session.refresh(alert)
    return alert


@pytest.mark.asyncio
async def test_list_alerts_scoped_to_owner(client, db_session):
    owner_headers, owner_id = _register_and_login(client)
    _other_headers, other_id = _register_and_login(client)

    await _make_alert(db_session, owner_id)
    await _make_alert(db_session, other_id)

    resp = client.get("/api/v1/alerts", headers=owner_headers)
    assert resp.status_code == 200
    body = resp.json()
    assert len(body) == 1


@pytest.mark.asyncio
async def test_list_alerts_filters_by_severity(client, db_session):
    headers, user_id = _register_and_login(client)
    await _make_alert(db_session, user_id, severity=SeverityLevel.CRITICAL)
    await _make_alert(db_session, user_id, severity=SeverityLevel.LOW)

    resp = client.get("/api/v1/alerts", headers=headers, params={"severity": "critical"})
    assert resp.status_code == 200
    body = resp.json()
    assert len(body) == 1
    assert body[0]["severity"] == "critical"


@pytest.mark.asyncio
async def test_list_alerts_filters_by_read_and_resolved(client, db_session):
    headers, user_id = _register_and_login(client)
    await _make_alert(db_session, user_id, read=True, resolved=False)
    await _make_alert(db_session, user_id, read=False, resolved=False)

    resp = client.get("/api/v1/alerts", headers=headers, params={"read": "false"})
    assert resp.status_code == 200
    body = resp.json()
    assert len(body) == 1
    assert body[0]["read"] is False


@pytest.mark.asyncio
async def test_get_alert_detail_includes_deliveries(client, db_session):
    headers, user_id = _register_and_login(client)
    alert = await _make_alert(db_session, user_id)

    resp = client.get(f"/api/v1/alerts/{alert.id}", headers=headers)
    assert resp.status_code == 200
    body = resp.json()
    assert body["id"] == str(alert.id)
    assert body["deliveries"] == []


@pytest.mark.asyncio
async def test_get_alert_not_owned_returns_404(client, db_session):
    _owner_headers, owner_id = _register_and_login(client)
    other_headers, _other_id = _register_and_login(client)
    alert = await _make_alert(db_session, owner_id)

    resp = client.get(f"/api/v1/alerts/{alert.id}", headers=other_headers)
    assert resp.status_code == 404


@pytest.mark.asyncio
async def test_mark_alert_read(client, db_session):
    headers, user_id = _register_and_login(client)
    alert = await _make_alert(db_session, user_id, read=False)

    resp = client.post(f"/api/v1/alerts/{alert.id}/read", headers=headers)
    assert resp.status_code == 200
    assert resp.json()["read"] is True


@pytest.mark.asyncio
async def test_resolve_alert(client, db_session):
    headers, user_id = _register_and_login(client)
    alert = await _make_alert(db_session, user_id, resolved=False)

    resp = client.post(f"/api/v1/alerts/{alert.id}/resolve", headers=headers)
    assert resp.status_code == 200
    assert resp.json()["resolved"] is True


@pytest.mark.asyncio
async def test_patch_alert_updates_both_flags(client, db_session):
    headers, user_id = _register_and_login(client)
    alert = await _make_alert(db_session, user_id)

    resp = client.patch(
        f"/api/v1/alerts/{alert.id}", json={"read": True, "resolved": True}, headers=headers
    )
    assert resp.status_code == 200
    body = resp.json()
    assert body["read"] is True
    assert body["resolved"] is True