"""Author RAG — Pytest Shared Fixtures.

Provides async DB, fakeredis, mocked OpenAI, and mocked Stripe
for all test modules. Zero real network calls in tests.
"""

import pytest
import pytest_asyncio
from httpx import AsyncClient, ASGITransport
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
from unittest.mock import AsyncMock, MagicMock, patch

from app.models.base import Base
from app.main import create_app
from app.dependencies import get_db, get_redis


# ── In-Memory SQLite DB ───────────────────────────────────────────────────────

@pytest_asyncio.fixture(scope="function")
async def db_engine():
    engine = create_async_engine("sqlite+aiosqlite:///:memory:", echo=False)
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield engine
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)
    await engine.dispose()


@pytest_asyncio.fixture(scope="function")
async def db_session(db_engine):
    factory = async_sessionmaker(db_engine, expire_on_commit=False)
    async with factory() as session:
        yield session


# ── Fake Redis ────────────────────────────────────────────────────────────────

@pytest.fixture
def fake_redis():
    try:
        import fakeredis.aioredis as fakeredis
        return fakeredis.FakeRedis(decode_responses=True)
    except ImportError:
        redis = MagicMock()
        redis.get = AsyncMock(return_value=None)
        redis.set = AsyncMock(return_value=True)
        redis.setex = AsyncMock(return_value=True)
        redis.delete = AsyncMock(return_value=1)
        redis.exists = AsyncMock(return_value=0)
        redis.incr = AsyncMock(return_value=1)
        redis.expire = AsyncMock(return_value=True)
        return redis


# ── FastAPI Test Client ───────────────────────────────────────────────────────

@pytest_asyncio.fixture(scope="function")
async def client(db_session, fake_redis):
    app = create_app()

    async def override_db():
        yield db_session

    async def override_redis():
        return fake_redis

    app.dependency_overrides[get_db] = override_db
    app.dependency_overrides[get_redis] = override_redis

    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as c:
        yield c

    app.dependency_overrides.clear()


# ── Mock OpenAI ───────────────────────────────────────────────────────────────

@pytest.fixture(autouse=True)
def mock_openai():
    mock_response = MagicMock()
    mock_response.choices = [MagicMock()]
    mock_response.choices[0].message.content = "This is a mock AI response."
    mock_response.usage.total_tokens = 50

    with patch("openai.AsyncOpenAI") as mock_client:
        instance = mock_client.return_value
        instance.chat.completions.create = AsyncMock(return_value=mock_response)
        instance.embeddings.create = AsyncMock(return_value=MagicMock(
            data=[MagicMock(embedding=[0.1] * 1536)]
        ))
        yield mock_client


# ── Mock Stripe ───────────────────────────────────────────────────────────────

@pytest.fixture
def mock_stripe():
    mock_session = MagicMock()
    mock_session.id = "cs_test_mock_session"
    mock_session.url = "https://checkout.stripe.com/test"
    mock_session.payment_status = "paid"
    mock_session.customer_details = MagicMock(email="test@example.com", name="Test Author")
    mock_session.customer = "cus_test_123"
    mock_session.subscription = "sub_test_123"
    mock_session.metadata = {"plan_id": "starter"}

    with patch("stripe.checkout.Session.create", return_value=mock_session), \
         patch("stripe.checkout.Session.retrieve", return_value=mock_session), \
         patch("stripe.Webhook.construct_event") as mock_webhook, \
         patch("stripe.Subscription.retrieve"), \
         patch("stripe.billing_portal.Session.create"):
        mock_webhook.return_value = MagicMock(id="evt_test_123", type="checkout.session.completed")
        yield {"session": mock_session, "webhook": mock_webhook}


# ── Fixtures ──────────────────────────────────────────────────────────────────

@pytest_asyncio.fixture
async def test_author(db_session):
    from datetime import datetime, timedelta, timezone
    from app.models.user import User
    from app.models.client_access import ClientAccess
    from app.models.base import generate_uuid
    import bcrypt

    user = User(
        id=generate_uuid(), email="author@test.com",
        password_hash=bcrypt.hashpw(b"TestPass123!", bcrypt.gensalt()).decode(),
        role="author", full_name="Test Author", is_active=True, stripe_plan_id="starter",
    )
    db_session.add(user)
    now = datetime.now(timezone.utc)
    access = ClientAccess(
        id=generate_uuid(), author_id=user.id, granted_by=None,
        plan="starter", plan_id="starter", granted_at=now,
        expires_at=now + timedelta(days=365), token_hash="test_token_hash",
        token_budget=500_000, tokens_used=0, auto_renew=True,
    )
    db_session.add(access)
    await db_session.commit()
    return user


@pytest_asyncio.fixture
async def test_pricing_plan(db_session):
    import json
    from app.models.pricing_plan import PricingPlan

    plan = PricingPlan(
        id="starter", display_name="Starter",
        monthly_price_usd=49.0, annual_price_usd=39.0,
        stripe_price_id_monthly="price_test_monthly",
        stripe_price_id_annual="price_test_annual",
        max_books=5, max_chats_per_month=2000, max_token_budget=500_000, max_embeds=1,
        features_json=json.dumps(["5 books", "2,000 chats/month", "Email support"]),
        is_active=True, is_popular=False, sort_order=1,
    )
    db_session.add(plan)
    await db_session.commit()
    return plan