import pytest
import asyncio
import os
import sys
from typing import AsyncGenerator
from unittest.mock import AsyncMock, MagicMock, patch
from fastapi.testclient import TestClient
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker
import redis.asyncio as redis

# Add the app directory to the Python path for imports
sys.path.append(os.path.join(os.path.dirname(__file__), '..'))

# ================================================================
# TEST DATABASE CONFIGURATION
# ================================================================

# Use in-memory SQLite for fast testing
TEST_DATABASE_URL = "sqlite+aiosqlite:///:memory:"

@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="function")
async def test_engine():
    """Create a test database engine for each test function"""
    engine = create_async_engine(
        TEST_DATABASE_URL,
        echo=False,  # Set to True for SQL debugging
        future=True,
        pool_pre_ping=True
    )
    # Import Base and metadata after engine creation to avoid circular imports
    from shared.database.base import Base
    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.fixture(scope="function")
async def test_db(test_engine) -> AsyncGenerator[AsyncSession, None]:
    """Create a test database session for each test function"""
    async_session = sessionmaker(
        test_engine,
        class_=AsyncSession,
        expire_on_commit=False
    )

    async with async_session() as session:
        yield session
        await session.rollback() # Rollback after each test to ensure a clean state

@pytest.fixture(scope="function")
def client(test_db):
    """Create a test client with database dependency override"""
    try:
        from app.main import app
        from app.core.database import get_db

        def override_get_db():
            # test_db is already an AsyncSession yielded by the fixture
            yield test_db

        app.dependency_overrides[get_db] = override_get_db

        with TestClient(app) as test_client:
            yield test_client

        # Clean up overrides
        app.dependency_overrides.clear()
    except ImportError as e:
        pytest.skip(f"Cannot import app modules: {e}. Ensure app.main and app.core.database are accessible.")

@pytest.fixture(scope="function")
async def test_user(test_db):
    """Create a test user in the database"""
    try:
        from app.services.auth_service import AuthService
        from app.schemas.auth import UserRegistration

        user_data = UserRegistration(
            email="existing@bakery.es",
            password="TestPassword123",
            full_name="Existing User"
        )

        user = await AuthService.create_user(
            email=user_data.email,
            password=user_data.password,
            full_name=user_data.full_name,
            db=test_db
        )
        return user
    except ImportError:
        pytest.skip("AuthService not available")

@pytest.fixture(scope="function")
async def test_redis_client():
    """Create a test Redis client"""
    # Use a mock Redis client for testing
    mock_redis = AsyncMock(spec=redis.Redis)
    yield mock_redis
    await mock_redis.close()

# ================================================================\
# TEST HELPERS
# ================================================================\

import uuid # Moved from test_auth_comprehensive.py as it's a shared helper

def generate_random_user_data(prefix="test"):
    """Generates unique user data for testing."""
    unique_id = uuid.uuid4().hex[:8]
    return {
        "email": f"{prefix}_{unique_id}@bakery.es",
        "password": f"StrongPwd{unique_id}!",
        "full_name": f"Test User {unique_id}"
    }

# ================================================================\
# PYTEST HOOKS
# ================================================================\

def pytest_addoption(parser):
    """Add custom options to pytest"""
    parser.addoption(
        "--integration", action="store_true", default=False, help="run integration tests"
    )
    parser.addoption(
        "--api", action="store_true", default=False, help="run API tests"
    )
    parser.addoption(
        "--security", action="store_true", default=False, help="run security tests"
    )
    parser.addoption(
        "--performance", action="store_true", default=False, help="run performance tests"
    )
    parser.addoption(
        "--slow", action="store_true", default=False, help="run slow tests"
    )
    parser.addoption(
        "--auth", action="store_true", default=False, help="run authentication tests"
    )

def pytest_configure(config):
    """Configure pytest markers"""
    config.addinivalue_line(
        "markers", "unit: marks tests as unit tests"
    )
    config.addinivalue_line(
        "markers", "integration: marks tests as integration tests"
    )
    config.addinivalue_line(
        "markers", "api: marks tests as API tests"
    )
    config.addinivalue_line(
        "markers", "security: marks tests as security tests"
    )
    config.addinivalue_line(
        "markers", "performance: marks tests as performance tests"
    )
    config.addinivalue_line(
        "markers", "slow: marks tests as slow running"
    )
    config.addinivalue_line(
        "markers", "auth: marks tests as authentication tests"
    )

def pytest_collection_modifyitems(config, items):
    """Modify test collection to add markers automatically"""
    for item in items:
        # Add markers based on test class or function names
        if "test_api" in item.name.lower() or "API" in str(item.cls):
            item.add_marker(pytest.mark.api)
        
        if "test_security" in item.name.lower() or "Security" in str(item.cls):
            item.add_marker(pytest.mark.security)
        
        if "test_performance" in item.name.lower() or "Performance" in str(item.cls):
            item.add_marker(pytest.mark.performance)
            item.add_marker(pytest.mark.slow)
        
        if "integration" in item.name.lower() or "Integration" in str(item.cls):
            item.add_marker(pytest.mark.integration)
        
        if "Flow" in str(item.cls) or "flow" in item.name.lower():
            item.add_marker(pytest.mark.integration) # Authentication flows are integration tests

        # Mark all tests in test_auth_comprehensive.py with 'auth'
        if "test_auth_comprehensive" in str(item.fspath):
            item.add_marker(pytest.mark.auth)

    # Filtering logic for command line options
    if not any([config.getoption("--integration"), config.getoption("--api"),
                config.getoption("--security"), config.getoption("--performance"),
                config.getoption("--slow"), config.getoption("--auth")]):
        return # No specific filter applied, run all collected tests

    skip_markers = []
    if not config.getoption("--integration"):
        skip_markers.append(pytest.mark.integration)
    if not config.getoption("--api"):
        skip_markers.append(pytest.mark.api)
    if not config.getoption("--security"):
        skip_markers.append(pytest.mark.security)
    if not config.getoption("--performance"):
        skip_markers.append(pytest.mark.performance)
    if not config.getoption("--slow"):
        skip_markers.append(pytest.mark.slow)
    if not config.getoption("--auth"):
        skip_markers.append(pytest.mark.auth)
    
    # Remove tests with any of the skip markers
    if skip_markers:
        for item in list(items): # Iterate over a copy to allow modification
            if any(marker in item.iter_markers() for marker in skip_markers):
                items.remove(item)
                item.add_marker(pytest.mark.skip(reason="filtered by command line option"))