"""Dashboard analytics: aggregate counts scoped correctly to the requesting
user (never leaking another user's data), zero-filled for enum members with
no data, and recent signals ordered newest-first."""

from __future__ import annotations

import uuid
from datetime import UTC, datetime

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,
    MonitoringRunStatus,
    MonitoringRunTrigger,
    SeverityLevel,
    SourceType,
)
from app.models.monitoring_run import MonitoringRun
from app.models.snapshot import Snapshot
from app.models.source import Source
from app.services.analytics_service import get_dashboard_analytics


async def _make_company_with_activity(db_session, user_id: uuid.UUID) -> Company:
    company = Company(
        id=uuid.uuid4(), user_id=user_id, name="Acme Corp", 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="Site",
        base_url="https://acme.example",
    )
    db_session.add(source)
    await db_session.flush()

    run = MonitoringRun(
        company_id=company.id,
        trigger_type=MonitoringRunTrigger.MANUAL,
        status=MonitoringRunStatus.SUCCESSFUL,
    )
    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="h1",
        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.LEADERSHIP_CHANGE,
        raw_diff={},
        significance_score=0.6,
        confidence_score=0.8,
        severity=SeverityLevel.HIGH,
        summary="New CEO announced",
    )
    db_session.add(change)
    await db_session.flush()

    alert = Alert(
        company_id=company.id,
        detected_change_id=change.id,
        user_id=user_id,
        title="Leadership change",
        summary="New CEO announced",
        why_it_matters="Signals a strategy shift",
        severity=SeverityLevel.HIGH,
        confidence=0.8,
    )
    db_session.add(alert)
    await db_session.commit()
    return company


@pytest.mark.asyncio
async def test_analytics_aggregates_counts_for_the_requesting_user(db_session):
    user_id = uuid.uuid4()
    await _make_company_with_activity(db_session, user_id)

    analytics = await get_dashboard_analytics(db_session, user_id)

    assert analytics.changes_by_type["leadership_change"] == 1
    assert analytics.changes_by_type["price_change"] == 0
    assert analytics.alerts_by_severity["high"] == 1
    assert analytics.alerts_by_severity["critical"] == 0
    assert analytics.sources_by_status["active"] == 1
    assert len(analytics.recent_signals) == 1
    assert analytics.recent_signals[0].company_name == "Acme Corp"
    assert analytics.recent_signals[0].change_type == "leadership_change"


@pytest.mark.asyncio
async def test_analytics_does_not_leak_another_users_data(db_session):
    user_id = uuid.uuid4()
    other_user_id = uuid.uuid4()
    await _make_company_with_activity(db_session, other_user_id)

    analytics = await get_dashboard_analytics(db_session, user_id)

    assert all(count == 0 for count in analytics.changes_by_type.values())
    assert all(count == 0 for count in analytics.alerts_by_severity.values())
    assert analytics.recent_signals == []


@pytest.mark.asyncio
async def test_analytics_recent_signals_ordered_newest_first(db_session):
    user_id = uuid.uuid4()
    company = await _make_company_with_activity(db_session, user_id)

    source = Source(
        company_id=company.id,
        source_type=SourceType.WEBSITE,
        name="Site 2",
        base_url="https://acme.example/2",
    )
    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="h2",
        structured_summary={},
        text_summary="",
        monitoring_run_id=run.id,
    )
    db_session.add(snapshot)
    await db_session.flush()
    newer_change = DetectedChange(
        company_id=company.id,
        source_id=source.id,
        monitoring_run_id=run.id,
        current_snapshot_id=snapshot.id,
        change_type=ChangeType.PRICE_CHANGE,
        raw_diff={},
        significance_score=0.5,
        confidence_score=0.7,
        severity=SeverityLevel.MEDIUM,
        summary="Price increased",
        created_at=datetime.now(UTC),
    )
    db_session.add(newer_change)
    await db_session.commit()

    analytics = await get_dashboard_analytics(db_session, user_id)

    assert analytics.recent_signals[0].change_type == "price_change"