import pytest
import os
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from fastapi.testclient import TestClient

# Force settings to use sqlite test database
os.environ["DATABASE_URL"] = "sqlite:///./test.db"

from backend.app.main import app
from backend.app.core.database import get_db
from backend.app.models.base import Base

# Create test engine and session
SQLALCHEMY_DATABASE_URL = "sqlite:///./test_api.db"
engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False})
TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

@pytest.fixture(scope="session", autouse=True)
def setup_db():
    # Drop and recreate tables
    Base.metadata.drop_all(bind=engine)
    Base.metadata.create_all(bind=engine)
    yield
    # Clean up test database file
    Base.metadata.drop_all(bind=engine)
    if os.path.exists("./test_api.db"):
        try:
            os.remove("./test_api.db")
        except PermissionError:
            pass

@pytest.fixture
def db_session():
    connection = engine.connect()
    transaction = connection.begin()
    session = TestingSessionLocal(bind=connection)
    
    yield session
    
    session.close()
    transaction.rollback()
    connection.close()

@pytest.fixture
def client(db_session):
    def override_get_db():
        try:
            yield db_session
        finally:
            pass
            
    app.dependency_overrides[get_db] = override_get_db
    with TestClient(app) as test_client:
        yield test_client
    app.dependency_overrides.clear()