"""Tests for the AI Proactive plugin — Context API, Suggestions API,
Dismiss API, Settings API, Stats API, and Proactive Engine unit tests.

Uses pytest + pytest-asyncio, httpx.AsyncClient, login_client,
seed_tenant_and_users, ORIGIN_HEADER from conftest.py.
Mocks litellm.acompletion and litellm.aembedding to avoid real API calls.
"""

from __future__ import annotations

import asyncio
import json
import uuid
from unittest.mock import AsyncMock, MagicMock, patch

import pytest
import pytest_asyncio
from httpx import ASGITransport, AsyncClient
from sqlalchemy import text
from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, async_sessionmaker

# Import models at module level so Base.metadata.create_all includes their tables
from app.plugins.builtins.ai_proactive.models import (  # noqa: F401
    ContextLog,
    ProactiveSettings,
    ProactiveSuggestion,
)
from app.plugins.builtins.ai_assistant.models import (  # noqa: F401
    AIProvider, AIModel, AIPreset, AIAgent, AIChatSession, AIChatMessage,
    AIChatFolder, AIChatAttachment,
)
from app.plugins.builtins.unified_search.models import (  # noqa: F401
    SearchProviderRegistry as SearchProviderRegistryModel,
    SearchIndexLog,
)
from app.plugins.builtins.ai_proactive import AIProactivePlugin
from app.plugins.builtins.ai_assistant import AIAssistantPlugin
from app.plugins.builtins.unified_search import UnifiedSearchPlugin
from app.core.db import close_engine, reset_engine_for_testing
from app.core.service_container import get_container
from app.main import create_app
from app.plugins.registry import reset_registry_for_testing
from app.services.plugin_service import reset_plugin_service_for_testing
from tests.conftest import ORIGIN_HEADER, _get_sync_engine, login_client, seed_tenant_and_users

# ─── AI Proactive Fixtures ───


@pytest_asyncio.fixture(autouse=True)
async def clean_ai_proactive_tables():
    """Truncate ai_proactive tables before each test (not in conftest TRUNCATE list)."""
    sync_eng = _get_sync_engine()
    with sync_eng.connect() as conn:
        conn.execute(
            text(
                "TRUNCATE TABLE ai_proactive_suggestions, "
                "ai_proactive_context_log, ai_proactive_settings CASCADE;"
            )
        )
        conn.commit()
    sync_eng.dispose()
    yield


@pytest_asyncio.fixture
async def ai_proactive_app(engine: AsyncEngine, redis_client):
    """FastAPI app with AI Proactive plugin registered, installed, and activated."""
    reset_engine_for_testing(engine)
    app = create_app()
    registry = reset_registry_for_testing()
    registry.initialize(engine, app)
    container = get_container()
    await container.initialize()
    registry.register_plugin(AIAssistantPlugin())
    registry.register_plugin(UnifiedSearchPlugin())
    registry.register_plugin(AIProactivePlugin())
    reset_plugin_service_for_testing(registry)

    sf = async_sessionmaker(bind=engine, expire_on_commit=False, class_=AsyncSession)
    async with sf() as session:
        # Install dependencies first, then ai_proactive
        await registry.install(session, "ai_assistant")
        await registry.activate(session, "ai_assistant")
        await registry.install(session, "unified_search")
        await registry.activate(session, "unified_search")
        await registry.install(session, "ai_proactive")
        await registry.activate(session, "ai_proactive")
        await session.commit()

    yield app
    await close_engine()


@pytest_asyncio.fixture
async def ai_proactive_client(ai_proactive_app) -> AsyncClient:
    """HTTP test client with ai_proactive plugin active."""
    transport = ASGITransport(app=ai_proactive_app)
    async with AsyncClient(transport=transport, base_url="http://test") as c:
        yield c


@pytest_asyncio.fixture
async def ai_proactive_authed_client(
    ai_proactive_client: AsyncClient, db_session: AsyncSession
) -> tuple[AsyncClient, dict]:
    """Authenticated admin client with seeded data and ai_proactive plugin active."""
    seed = await seed_tenant_and_users(db_session)
    # Grant is_system_admin so require_permission passes for ai_proactive:* permissions
    from sqlalchemy import update
    from app.models.user import User
    await db_session.execute(
        update(User).where(User.id == seed["admin_a"].id).values(is_system_admin=True)
    )
    await db_session.commit()
    # Login and capture CSRF token
    login_resp = await ai_proactive_client.post(
        "/api/v1/auth/login",
        json={"email": "admin@tenanta.com", "password": "TestPass123!"},
        headers=ORIGIN_HEADER,
    )
    assert login_resp.status_code == 200, f"Login failed: {login_resp.text}"
    csrf_token = login_resp.json().get("csrf_token", "")
    # Store CSRF token on client for use in requests
    ai_proactive_client.headers["X-CSRF-Token"] = csrf_token
    return ai_proactive_client, seed


@pytest.fixture(autouse=True)
async def mock_litellm():
    """Mock litellm.acompletion and litellm.aembedding for all tests."""
    mock_resp = MagicMock()
    mock_resp.choices = [MagicMock()]
    mock_resp.choices[0].message.content = json.dumps({
        "suggestion_type": "info",
        "title": "Test Suggestion",
        "content": "This is a test suggestion",
        "confidence": 0.8,
        "actions": [
            {
                "method": "GET",
                "path": "/api/v1/contacts",
                "body": {},
                "description": "View contacts",
            }
        ],
    })

    mock_emb_resp = MagicMock()
    mock_emb_resp.data = [{"embedding": [0.1] * 768}]

    with (
        patch("litellm.acompletion", new_callable=AsyncMock, return_value=mock_resp),
        patch("litellm.aembedding", new_callable=AsyncMock, return_value=mock_emb_resp),
    ):
        yield


# ─── 1. Context API (POST /api/v1/ai-proactive/context) ───


@pytest.mark.asyncio
async def test_context_report_accepted(
    ai_proactive_authed_client: tuple[AsyncClient, dict],
):
    """Context-Report wird akzeptiert (200)."""
    client, _ = ai_proactive_authed_client
    resp = await client.post(
        "/api/v1/ai-proactive/context",
        json={
            "page": "/contacts",
            "entity_type": "contact",
            "entity_id": str(uuid.uuid4()),
        },
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    assert resp.json()["status"] == "ok"


@pytest.mark.asyncio
async def test_context_unauthorized(ai_proactive_client: AsyncClient):
    """Ohne Auth → 403 (CSRF middleware blocks before auth check on POST)."""
    resp = await ai_proactive_client.post(
        "/api/v1/ai-proactive/context",
        json={"page": "/contacts"},
        headers=ORIGIN_HEADER,
    )
    # Without a session cookie, CSRF middleware returns 403 before auth is checked
    assert resp.status_code in (401, 403)


# ─── 2. Suggestions API (GET /api/v1/ai-proactive/suggestions) ───


@pytest.mark.asyncio
async def test_get_suggestions(
    ai_proactive_authed_client: tuple[AsyncClient, dict],
    db_session: AsyncSession,
):
    """Gibt Suggestions für User zurück."""
    client, seed = ai_proactive_authed_client
    suggestion = ProactiveSuggestion(
        tenant_id=seed["tenant_a"].id,
        user_id=seed["admin_a"].id,
        entity_type="contact",
        entity_id=uuid.uuid4(),
        suggestion_type="info",
        title="Test Suggestion",
        content="Test content",
        confidence=0.8,
        actions=[],
        context_snapshot={},
    )
    db_session.add(suggestion)
    await db_session.commit()

    resp = await client.get(
        "/api/v1/ai-proactive/suggestions",
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    data = resp.json()
    assert "items" in data
    assert data["total"] >= 1
    titles = [item["title"] for item in data["items"]]
    assert "Test Suggestion" in titles


@pytest.mark.asyncio
async def test_suggestions_tenant_isolation(
    ai_proactive_authed_client: tuple[AsyncClient, dict],
    db_session: AsyncSession,
):
    """Nur eigene Tenant — Tenant B suggestions are not visible to Tenant A."""
    client, seed = ai_proactive_authed_client

    # Suggestion for tenant B user
    suggestion_b = ProactiveSuggestion(
        tenant_id=seed["tenant_b"].id,
        user_id=seed["admin_b"].id,
        entity_type="contact",
        entity_id=uuid.uuid4(),
        suggestion_type="info",
        title="Tenant B Secret",
        content="Should not be visible to A",
        confidence=0.8,
        actions=[],
        context_snapshot={},
    )
    # Suggestion for tenant A user
    suggestion_a = ProactiveSuggestion(
        tenant_id=seed["tenant_a"].id,
        user_id=seed["admin_a"].id,
        entity_type="contact",
        entity_id=uuid.uuid4(),
        suggestion_type="info",
        title="Tenant A Visible",
        content="Should be visible",
        confidence=0.8,
        actions=[],
        context_snapshot={},
    )
    db_session.add_all([suggestion_b, suggestion_a])
    await db_session.commit()

    resp = await client.get(
        "/api/v1/ai-proactive/suggestions",
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    data = resp.json()
    titles = [item["title"] for item in data["items"]]
    assert "Tenant A Visible" in titles
    assert "Tenant B Secret" not in titles


# ─── 3. Dismiss API (POST /api/v1/ai-proactive/suggestions/{id}/dismiss) ───


@pytest.mark.asyncio
async def test_dismiss_suggestion(
    ai_proactive_authed_client: tuple[AsyncClient, dict],
    db_session: AsyncSession,
):
    """Suggestion wird dismissed."""
    client, seed = ai_proactive_authed_client
    suggestion = ProactiveSuggestion(
        tenant_id=seed["tenant_a"].id,
        user_id=seed["admin_a"].id,
        entity_type="contact",
        entity_id=uuid.uuid4(),
        suggestion_type="info",
        title="Dismiss Me",
        content="Please dismiss this",
        confidence=0.8,
        actions=[],
        context_snapshot={},
    )
    db_session.add(suggestion)
    await db_session.commit()

    resp = await client.post(
        f"/api/v1/ai-proactive/suggestions/{suggestion.id}/dismiss",
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    assert resp.json()["status"] == "ok"

    # Verify it no longer appears in active suggestions
    resp2 = await client.get(
        "/api/v1/ai-proactive/suggestions",
        headers=ORIGIN_HEADER,
    )
    data = resp2.json()
    ids = [item["id"] for item in data["items"]]
    assert str(suggestion.id) not in ids


# ─── 4. Settings API (GET/PUT /api/v1/ai-proactive/settings) ───


@pytest.mark.asyncio
async def test_get_settings(
    ai_proactive_authed_client: tuple[AsyncClient, dict],
):
    """Settings werden zurückgegeben."""
    client, _ = ai_proactive_authed_client
    resp = await client.get(
        "/api/v1/ai-proactive/settings",
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    data = resp.json()
    assert "enabled" in data
    assert "suggestion_categories" in data
    assert "confidence_threshold" in data
    assert "rate_limit_seconds" in data
    assert "model" in data
    assert "available_models" in data


@pytest.mark.asyncio
async def test_update_settings(
    ai_proactive_authed_client: tuple[AsyncClient, dict],
):
    """Settings können aktualisiert werden."""
    client, _ = ai_proactive_authed_client
    resp = await client.put(
        "/api/v1/ai-proactive/settings",
        json={"enabled": False, "confidence_threshold": 0.7},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    data = resp.json()
    assert data["enabled"] is False
    assert data["confidence_threshold"] == 0.7


@pytest.mark.asyncio
async def test_update_model(
    ai_proactive_authed_client: tuple[AsyncClient, dict],
):
    """Model kann geändert werden."""
    client, _ = ai_proactive_authed_client
    resp = await client.put(
        "/api/v1/ai-proactive/settings",
        json={"model": "ollama/llama3.2"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    data = resp.json()
    assert data["model"] == "ollama/llama3.2"


# ─── 5. Stats API (GET /api/v1/ai-proactive/stats) ───


@pytest.mark.asyncio
async def test_get_stats(
    ai_proactive_authed_client: tuple[AsyncClient, dict],
):
    """Stats werden zurückgegeben."""
    client, _ = ai_proactive_authed_client
    resp = await client.get(
        "/api/v1/ai-proactive/stats",
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    data = resp.json()
    assert "total_suggestions" in data
    assert "dismissed" in data
    assert "acted_upon" in data
    assert "active" in data
    assert "dismiss_rate" in data
    assert "act_rate" in data


# ─── 6. Proactive Engine (Unit Tests with mocks) ───


@pytest.mark.asyncio
async def test_sse_push():
    """Suggestion wird in Queue gepusht."""
    from app.plugins.builtins.ai_proactive.services import get_sse_queue, push_suggestion

    user_id = f"test-sse-{uuid.uuid4()}"
    queue = get_sse_queue(user_id)

    # Ensure queue is empty
    while not queue.empty():
        await queue.get()

    suggestion = {"id": "test-1", "title": "Test SSE Push"}
    await push_suggestion(user_id, suggestion)

    item = await asyncio.wait_for(queue.get(), timeout=1.0)
    assert item["id"] == "test-1"
    assert item["title"] == "Test SSE Push"


@pytest.mark.asyncio
async def test_rate_limiting(redis_client):
    """Rate-Limit funktioniert."""
    from app.plugins.builtins.ai_proactive.services import is_rate_limited

    tenant_id = uuid.uuid4()
    user_id = uuid.uuid4()
    rate_limit_seconds = 10

    with patch(
        "app.plugins.builtins.ai_proactive.services.get_cache",
        return_value=redis_client,
    ):
        # First call should not be rate limited
        limited = await is_rate_limited(tenant_id, user_id, rate_limit_seconds)
        assert limited is False

        # Second call should be rate limited
        limited = await is_rate_limited(tenant_id, user_id, rate_limit_seconds)
        assert limited is True