# Test configuration for Job Forge
import pytest
import asyncio
import asyncpg
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker
from fastapi.testclient import TestClient
from httpx import AsyncClient
import os
from typing import AsyncGenerator
from unittest.mock import AsyncMock

from app.main import app
from app.core.database import get_db, Base
from app.core.security import create_access_token
from app.models.user import User
from app.models.application import Application


# Test database URL
TEST_DATABASE_URL = os.getenv(
    "TEST_DATABASE_URL", 
    "postgresql+asyncpg://jobforge:jobforge123@localhost:5432/jobforge_test"
)

# Test engine and session factory
test_engine = create_async_engine(TEST_DATABASE_URL, echo=False)
TestSessionLocal = sessionmaker(
    test_engine, class_=AsyncSession, expire_on_commit=False
)


@pytest.fixture(scope="session")
def event_loop():
    """Create an instance of the default event loop for the test session."""
    loop = asyncio.get_event_loop_policy().new_event_loop()
    yield loop
    loop.close()


@pytest.fixture(scope="session")
async def setup_test_db():
    """Set up test database tables."""
    
    # Create all tables
    async with test_engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)
        await conn.run_sync(Base.metadata.create_all)
        
        # Enable RLS and create policies
        await conn.execute("""
            ALTER TABLE applications ENABLE ROW LEVEL SECURITY;
            
            DROP POLICY IF EXISTS applications_user_isolation ON applications;
            CREATE POLICY applications_user_isolation ON applications
                FOR ALL TO authenticated
                USING (user_id = current_setting('app.current_user_id')::UUID);
                
            -- Create vector extension if needed
            CREATE EXTENSION IF NOT EXISTS vector;
        """)
    
    yield
    
    # Cleanup
    async with test_engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)


@pytest.fixture
async def test_db(setup_test_db) -> AsyncGenerator[AsyncSession, None]:
    """Create a test database session."""
    
    async with TestSessionLocal() as session:
        try:
            yield session
        finally:
            await session.rollback()


@pytest.fixture
def override_get_db(test_db: AsyncSession):
    """Override the get_db dependency for testing."""
    
    def _override_get_db():
        return test_db
    
    app.dependency_overrides[get_db] = _override_get_db
    yield
    app.dependency_overrides.clear()


@pytest.fixture
def test_client(override_get_db):
    """Create a test client."""
    
    with TestClient(app) as client:
        yield client


@pytest.fixture
async def async_client(override_get_db):
    """Create an async test client."""
    
    async with AsyncClient(app=app, base_url="http://test") as client:
        yield client


@pytest.fixture
async def test_user(test_db: AsyncSession):
    """Create a test user."""
    
    from app.crud.user import create_user
    from app.schemas.user import UserCreate
    
    user_data = UserCreate(
        email="test@jobforge.com",
        password="testpassword123",
        first_name="Test",
        last_name="User"
    )
    
    user = await create_user(test_db, user_data)
    await test_db.commit()
    return user


@pytest.fixture
def test_user_token(test_user):
    """Create a JWT token for test user."""
    
    token_data = {"sub": str(test_user.id), "email": test_user.email}
    return create_access_token(data=token_data)


@pytest.fixture
async def test_application(test_db: AsyncSession, test_user):
    """Create a test job application."""
    
    from app.crud.application import create_application
    from app.schemas.application import ApplicationCreate
    
    app_data = ApplicationCreate(
        company_name="Test Corp",
        role_title="Software Developer",
        job_description="Python developer position with FastAPI experience",
        status="draft"
    )
    
    application = await create_application(test_db, app_data, test_user.id)
    await test_db.commit()
    return application


@pytest.fixture
def mock_claude_service():
    """Mock Claude AI service."""
    
    mock = AsyncMock()
    mock.generate_cover_letter.return_value = """
    Dear Hiring Manager,
    
    I am writing to express my strong interest in the Software Developer position at Test Corp.
    With my experience in Python development and FastAPI expertise, I am confident I would be 
    a valuable addition to your team.
    
    Thank you for your consideration.
    
    Sincerely,
    Test User
    """
    
    return mock


@pytest.fixture
def mock_openai_service():
    """Mock OpenAI service."""
    
    mock = AsyncMock()
    mock.create_embedding.return_value = [0.1] * 1536  # Mock embedding vector
    mock.test_connection.return_value = True
    
    return mock


@pytest.fixture
async def multiple_test_users(test_db: AsyncSession):
    """Create multiple test users for isolation testing."""
    
    from app.crud.user import create_user
    from app.schemas.user import UserCreate
    
    users = []
    for i in range(3):
        user_data = UserCreate(
            email=f"user{i}@test.com",
            password="password123",
            first_name=f"User{i}",
            last_name="Test"
        )
        user = await create_user(test_db, user_data)
        users.append(user)
    
    await test_db.commit()
    return users


@pytest.fixture
async def applications_for_users(test_db: AsyncSession, multiple_test_users):
    """Create applications for multiple users to test isolation."""
    
    from app.crud.application import create_application
    from app.schemas.application import ApplicationCreate
    
    all_applications = []
    
    for i, user in enumerate(multiple_test_users):
        for j in range(2):  # 2 applications per user
            app_data = ApplicationCreate(
                company_name=f"Company{i}-{j}",
                role_title=f"Role{i}-{j}",
                job_description=f"Job description for user {i}, application {j}",
                status="draft"
            )
            application = await create_application(test_db, app_data, user.id)
            all_applications.append(application)
    
    await test_db.commit()
    return all_applications


# Test data factories
class TestDataFactory:
    """Factory for creating test data."""
    
    @staticmethod
    def user_data(email: str = None, **kwargs):
        """Create user test data."""
        return {
            "email": email or "test@example.com",
            "password": "testpassword123",
            "first_name": "Test",
            "last_name": "User",
            **kwargs
        }
    
    @staticmethod
    def application_data(company_name: str = None, **kwargs):
        """Create application test data."""
        return {
            "company_name": company_name or "Test Company",
            "role_title": "Software Developer",
            "job_description": "Python developer position",
            "status": "draft",
            **kwargs
        }
    
    @staticmethod
    def ai_response():
        """Create mock AI response."""
        return """
        Dear Hiring Manager,
        
        I am excited to apply for this position. My background in software development
        and passion for technology make me an ideal candidate.
        
        Best regards,
        Test User
        """


# Database utilities for testing
async def create_test_user_and_token(db: AsyncSession, email: str):
    """Helper to create a user and return auth token."""
    
    from app.crud.user import create_user
    from app.schemas.user import UserCreate
    
    user_data = UserCreate(
        email=email,
        password="password123",
        first_name="Test",
        last_name="User"
    )
    
    user = await create_user(db, user_data)
    await db.commit()
    
    token_data = {"sub": str(user.id), "email": user.email}
    token = create_access_token(data=token_data)
    
    return user, token


async def set_rls_context(db: AsyncSession, user_id: str):
    """Set RLS context for testing multi-tenancy."""
    
    await db.execute(f"SET app.current_user_id = '{user_id}'")


# Performance testing helpers
@pytest.fixture
def benchmark_db_operations():
    """Benchmark database operations."""
    
    import time
    
    class BenchmarkContext:
        def __init__(self):
            self.start_time = None
            self.end_time = None
        
        def __enter__(self):
            self.start_time = time.time()
            return self
        
        def __exit__(self, *args):
            self.end_time = time.time()
        
        @property
        def duration(self):
            return self.end_time - self.start_time if self.end_time else None
    
    return BenchmarkContext