"""
Unit Tests — AnalyticsService

Tests:
- get_summary: correct counts, completion rate calculation
- get_visit_analytics: per-visit stats, correct rates
- get_visit_analytics: returns None for missing visit
- get_visit_trends: returns trend points, respects days param
"""

import pytest
from sqlalchemy.ext.asyncio import AsyncSession

from models.visit_model import Visit
from models.checklist_model import Checklist
from models.photo_model import Photo
from services.analytics_service import AnalyticsService


@pytest.mark.asyncio
class TestAnalyticsSummary:
    """Tests for AnalyticsService.get_summary()"""

    async def test_empty_db_returns_zeros(self, async_session: AsyncSession):
        svc = AnalyticsService()
        result = await svc.get_summary(async_session)
        data = result["data"]
        assert data["visits"]["total"] == 0
        assert data["checklists"]["total_items"] == 0
        assert data["checklists"]["completion_rate_pct"] == 0.0
        assert data["photos"]["total"] == 0

    async def test_counts_visits_by_status(self, async_session: AsyncSession):
        from datetime import datetime, timezone
        # Insert 2 visits with different statuses
        for status in ("pending", "completed"):
            async_session.add(Visit(
                title=f"Visit {status}",
                visit_date=datetime(2026, 5, 1, 9, 0, tzinfo=timezone.utc),
                status=status,
            ))
        await async_session.flush()

        svc = AnalyticsService()
        result = await svc.get_summary(async_session)
        stats = result["data"]["visits"]
        assert stats["total"] == 2
        assert stats["by_status"]["pending"] == 1
        assert stats["by_status"]["completed"] == 1
        assert stats["by_status"]["in_progress"] == 0

    async def test_checklist_completion_rate(
        self, async_session: AsyncSession, sample_visit: Visit
    ):
        # Add 4 items, 3 checked → 75%
        from datetime import datetime, timezone
        for i, checked in enumerate([True, True, True, False]):
            async_session.add(Checklist(
                visit_id=sample_visit.id,
                item_name=f"Item {i}",
                is_checked=checked,
            ))
        await async_session.flush()

        svc = AnalyticsService()
        result = await svc.get_summary(async_session)
        cl = result["data"]["checklists"]
        assert cl["checked_items"] == 3
        assert cl["total_items"] >= 4
        assert cl["completion_rate_pct"] > 0.0

    async def test_response_structure(
        self, async_session: AsyncSession
    ):
        svc = AnalyticsService()
        result = await svc.get_summary(async_session)
        assert result["status"] == "success"
        assert "data" in result
        assert "meta" in result
        assert "generated_at" in result["meta"]


@pytest.mark.asyncio
class TestVisitAnalytics:
    """Tests for AnalyticsService.get_visit_analytics()"""

    async def test_returns_none_for_missing_visit(
        self, async_session: AsyncSession
    ):
        import uuid
        svc = AnalyticsService()
        result = await svc.get_visit_analytics(async_session, uuid.uuid4())
        assert result is None

    async def test_visit_with_no_checklists(
        self, async_session: AsyncSession, sample_visit: Visit
    ):
        svc = AnalyticsService()
        result = await svc.get_visit_analytics(async_session, sample_visit.id)
        assert result is not None
        cl = result["data"]["checklists"]
        assert cl["total_items"] == 0
        assert cl["completion_rate_pct"] == 0.0

    async def test_partial_checklist_completion(
        self, async_session: AsyncSession, sample_visit: Visit
    ):
        # 1 checked, 1 unchecked → 50%
        for checked in (True, False):
            async_session.add(Checklist(
                visit_id=sample_visit.id,
                item_name="Item",
                is_checked=checked,
            ))
        await async_session.flush()

        svc = AnalyticsService()
        result = await svc.get_visit_analytics(async_session, sample_visit.id)
        cl = result["data"]["checklists"]
        assert cl["checked_items"] == 1
        assert cl["unchecked_items"] == 1
        assert cl["completion_rate_pct"] == 50.0

    async def test_photo_count(
        self, async_session: AsyncSession, sample_visit: Visit
    ):
        from datetime import datetime, timezone
        for _ in range(3):
            async_session.add(Photo(
                visit_id=sample_visit.id,
                file_path="/test.jpg",
                file_name="test.jpg",
            ))
        await async_session.flush()

        svc = AnalyticsService()
        result = await svc.get_visit_analytics(async_session, sample_visit.id)
        assert result["data"]["photos"]["total"] == 3

    async def test_response_contains_visit_info(
        self, async_session: AsyncSession, sample_visit: Visit
    ):
        svc = AnalyticsService()
        result = await svc.get_visit_analytics(async_session, sample_visit.id)
        data = result["data"]
        assert data["visit_id"] == str(sample_visit.id)
        assert data["title"] == sample_visit.title
        assert data["status"] == sample_visit.status


@pytest.mark.asyncio
class TestVisitTrends:
    """Tests for AnalyticsService.get_visit_trends()

    NOTE: date_trunc() is PostgreSQL-specific.
    These tests are skipped when running against SQLite (unit test DB).
    They run against the real PostgreSQL in integration tests.
    """

    @pytest.mark.skip(reason="date_trunc is PostgreSQL-only; covered by integration tests")
    async def test_empty_returns_empty_list(self, async_session: AsyncSession):
        svc = AnalyticsService()
        result = await svc.get_visit_trends(async_session, days=7)
        assert result["status"] == "success"
        assert isinstance(result["data"]["trends"], list)

    @pytest.mark.skip(reason="date_trunc is PostgreSQL-only; covered by integration tests")
    async def test_period_days_reflected_in_response(
        self, async_session: AsyncSession
    ):
        svc = AnalyticsService()
        result = await svc.get_visit_trends(async_session, days=90)
        assert result["data"]["period_days"] == 90

    @pytest.mark.skip(reason="date_trunc is PostgreSQL-only; covered by integration tests")
    async def test_recent_visits_appear_in_trends(
        self, async_session: AsyncSession
    ):
        from datetime import datetime, timezone
        v = Visit(
            title="Today's visit",
            visit_date=datetime.now(timezone.utc),
            status="pending",
        )
        v.created_at = datetime.now(timezone.utc)
        async_session.add(v)
        await async_session.flush()

        svc = AnalyticsService()
        result = await svc.get_visit_trends(async_session, days=7)
        trends = result["data"]["trends"]
        assert len(trends) >= 1
        total_count = sum(p["count"] for p in trends)
        assert total_count >= 1