"""Pytest fixtures: in-memory async SQLite DB, app override, HTTP client.

Tests run fully offline — no PostgreSQL, no OpenRouter — using an in-memory
SQLite database and the built-in mock AI explainer.
"""

from __future__ import annotations

import os
from collections.abc import AsyncGenerator

import pytest_asyncio

# Force a deterministic, secret-free test configuration before app import.
os.environ.setdefault("ENVIRONMENT", "testing")
os.environ.setdefault("JWT_SECRET_KEY", "test-secret-key-please-ignore")
os.environ.setdefault("OPENROUTER_API_KEY", "")  # ensure mock explainer
os.environ.setdefault("DATABASE_URL", "sqlite+aiosqlite:///:memory:")

from httpx import ASGITransport, AsyncClient  # noqa: E402
from sqlalchemy.ext.asyncio import (  # noqa: E402
    AsyncSession,
    async_sessionmaker,
    create_async_engine,
)
from sqlalchemy.pool import StaticPool  # noqa: E402

from app.core.database import get_db  # noqa: E402
from app.main import app  # noqa: E402
from app.models import Base  # noqa: E402


@pytest_asyncio.fixture
async def engine() -> AsyncGenerator:
    eng = create_async_engine(
        "sqlite+aiosqlite:///:memory:",
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )
    async with eng.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield eng
    await eng.dispose()


@pytest_asyncio.fixture
async def session_factory(engine):
    return async_sessionmaker(bind=engine, class_=AsyncSession, expire_on_commit=False)


@pytest_asyncio.fixture
async def client(session_factory) -> AsyncGenerator[AsyncClient, None]:
    async def override_get_db() -> AsyncGenerator[AsyncSession, None]:
        async with session_factory() as session:
            try:
                yield session
                await session.commit()
            except Exception:
                await session.rollback()
                raise

    app.dependency_overrides[get_db] = override_get_db
    transport = ASGITransport(app=app)
    async with AsyncClient(transport=transport, base_url="http://test") as ac:
        yield ac
    app.dependency_overrides.clear()


@pytest_asyncio.fixture
async def auth_client(client: AsyncClient) -> AsyncClient:
    """An AsyncClient with a registered+logged-in user's bearer token set."""
    email = "tester@example.com"
    password = "supersecret123"
    await client.post(
        "/api/v1/auth/register",
        json={"email": email, "password": password, "full_name": "Tester"},
    )
    resp = await client.post(
        "/api/v1/auth/login",
        data={"username": email, "password": password},
    )
    token = resp.json()["access_token"]
    client.headers.update({"Authorization": f"Bearer {token}"})
    return client


@pytest_asyncio.fixture
async def machine_id(auth_client: AsyncClient) -> str:
    resp = await auth_client.post(
        "/api/v1/machines",
        json={"name": "Pump-1", "type": "pump", "location": "Plant A"},
    )
    return resp.json()["id"]