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"""
Test Suite for DB Service

Comprehensive tests for the plug-and-play DB Service including:
- Configuration
- Permissions (USER/ADMIN/SYSTEM)
- Filtering (user ownership, soft deletes)
- CRUD operations
- Database initialization
"""

import pytest
import os
from datetime import datetime
from sqlalchemy import select
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker

from services.db_service import (
    DBServiceConfig,
    QueryService,
    init_database,
    reset_database,
    get_registered_models,
)
from core.models import (
    Base, User, GeminiJob, PaymentTransaction, Contact,
    RateLimit, ApiKeyUsage, ClientUser, AuditLog
)


# Test database URL
TEST_DB_URL = "sqlite+aiosqlite:///:memory:"


@pytest.fixture
async def engine():
    """Create test database engine."""
    engine = create_async_engine(TEST_DB_URL, echo=False)
    yield engine
    await engine.dispose()


@pytest.fixture
async def session(engine):
    """Create test database session."""
    async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
    
    async with async_session() as session:
        yield session


@pytest.fixture(autouse=True)
async def setup_db(engine):
    """Setup test database with configuration."""
    # Register configuration
    DBServiceConfig.register(
        db_base=Base,
        all_models=[User, GeminiJob, PaymentTransaction, Contact,
                    RateLimit, ApiKeyUsage, ClientUser, AuditLog],
        user_filter_column="user_id",
        user_id_column="id",
        soft_delete_column="deleted_at",
        special_user_model=User,
        user_read_scoped=[User, GeminiJob, PaymentTransaction, Contact],
        user_create_scoped=[GeminiJob, PaymentTransaction, Contact],
        user_update_scoped=[User, GeminiJob],
        user_delete_scoped=[GeminiJob, Contact],
        admin_read_only=[RateLimit, ApiKeyUsage, ClientUser, AuditLog],
        admin_create_only=[RateLimit, ApiKeyUsage, ClientUser, AuditLog],
        admin_update_only=[RateLimit, ApiKeyUsage, ClientUser, PaymentTransaction],
        admin_delete_only=[RateLimit, ApiKeyUsage, User],
        system_read_scoped=[User, GeminiJob, PaymentTransaction, RateLimit,
                            ApiKeyUsage, ClientUser, AuditLog],
        system_create_scoped=[User, ClientUser, AuditLog, PaymentTransaction,
                              ApiKeyUsage, GeminiJob, RateLimit],
        system_update_scoped=[User, GeminiJob, PaymentTransaction, ApiKeyUsage,
                              RateLimit, ClientUser],
        system_delete_scoped=[GeminiJob, RateLimit, ApiKeyUsage],
    )
    
    # Initialize database
    await init_database(engine)
    
    yield
    
    # Cleanup
    await reset_database(engine)


@pytest.fixture
async def regular_user(session):
    """Create a regular test user."""
    import uuid
    user = User(
        user_id=str(uuid.uuid4()),
        email="user@example.com",
        name="Test User",
        credits=100
    )
    session.add(user)
    await session.commit()
    await session.refresh(user)
    return user


@pytest.fixture
async def admin_user(session):
    """Create an admin test user."""
    import uuid
    user = User(
        user_id=str(uuid.uuid4()),
        email=os.getenv("ADMIN_EMAILS", "admin@example.com").split(",")[0],
        name="Admin User",
        credits=1000
    )
    session.add(user)
    await session.commit()
    await session.refresh(user)
    return user


@pytest.fixture
async def other_user(session):
    """Create another test user."""
    import uuid
    user = User(
        user_id=str(uuid.uuid4()),
        email="other@example.com",
        name="Other User",
        credits=50
    )
    session.add(user)
    await session.commit()
    await session.refresh(user)
    return user


# ============================================================================
# Configuration Tests
# ============================================================================

class TestConfiguration:
    """Test DB Service configuration."""
    
    def test_config_registered(self):
        """Test that configuration is registered."""
        assert DBServiceConfig.is_registered()
        assert DBServiceConfig.db_base == Base
        assert len(DBServiceConfig.all_models) == 8
    
    def test_get_registered_models(self):
        """Test getting registered models."""
        models = get_registered_models()
        assert len(models) == 8
        assert User in models
        assert GeminiJob in models
    
    def test_column_names(self):
        """Test configured column names."""
        assert DBServiceConfig.user_filter_column == "user_id"
        assert DBServiceConfig.soft_delete_column == "deleted_at"
        assert DBServiceConfig.special_user_model == User


# ============================================================================
# Permission Tests
# ============================================================================

class TestPermissions:
    """Test USER/ADMIN/SYSTEM permission hierarchy."""
    
    async def test_user_can_read_own_data(self, session, regular_user):
        """Test that users can read their own data."""
        import uuid
        job = GeminiJob(
            job_id=str(uuid.uuid4()),
            user_id=regular_user.id,
            job_type="text",
            input_data={"prompt": "Test"},
            status="queued"
        )
        session.add(job)
        await session.commit()
        
        qs = QueryService(regular_user, session)
        jobs = await qs.select().execute(select(GeminiJob))
        
        assert len(jobs) == 1
        assert jobs[0].id == job.id
    
    async def test_user_cannot_read_others_data(self, session, regular_user, other_user):
        """Test that users cannot read other users' data."""
        # Create job for other user
        import uuid
        job = GeminiJob(
            job_id=str(uuid.uuid4()),
            user_id=other_user.id,
            job_type="text",
            input_data={"prompt": "Other"},
            status="queued"
        )
        session.add(job)
        await session.commit()
        
        # Regular user tries to read
        qs = QueryService(regular_user, session)
        jobs = await qs.select().execute(select(GeminiJob))
        
        assert len(jobs) == 0  # Should not see other user's jobs
    
    async def test_admin_can_read_all_data(self, session, admin_user, regular_user):
        """Test that admins can read all users' data."""
        # Create jobs for different users
        import uuid
        job1 = GeminiJob(
            job_id=str(uuid.uuid4()),
            user_id=regular_user.id,
            job_type="text",
            input_data={"prompt": "User Job"},
            status="queued"
        )
        job2 = GeminiJob(
            job_id=str(uuid.uuid4()),
            user_id=admin_user.id,
            job_type="text",
            input_data={"prompt": "Admin Job"},
            status="queued"
        )
        session.add_all([job1, job2])
        await session.commit()
        
        qs = QueryService(admin_user, session)
        jobs = await qs.select().execute(select(GeminiJob))
        
        assert len(jobs) == 2  # Admin sees all jobs
    
    async def test_user_cannot_access_admin_only_models(self, session, regular_user):
        """Test that regular users cannot access admin-only models."""
        qs = QueryService(regular_user, session)
        
        with pytest.raises(Exception) as exc_info:
            await qs.select().execute(select(RateLimit))
        
        assert "403" in str(exc_info.value) or "administrator" in str(exc_info.value).lower()
    
    async def test_admin_can_access_admin_only_models(self, session, admin_user):
        """Test that admins can access admin-only models."""
        from datetime import datetime, timedelta
        now = datetime.now()
        rate_limit = RateLimit(
            identifier="test",
            endpoint="/api/test",
            attempts=10,
            window_start=now,
            expires_at=now + timedelta(hours=1)
        )
        session.add(rate_limit)
        await session.commit()
        
        qs = QueryService(admin_user, session)
        limits = await qs.select().execute(select(RateLimit))
        
        assert len(limits) == 1
    
    async def test_system_can_create_user(self, session, regular_user):
        """Test that system operations can create users."""
        qs = QueryService(regular_user, session, is_system=True)
        
        # System should be able to bypass permissions
        # (actual create would use direct SQLAlchemy, but permission check passes)
        assert qs.is_system is True


#  ============================================================================
# Soft Delete Tests
# ============================================================================

class TestSoftDeletes:
    """Test soft delete functionality."""
    
    async def test_soft_delete_marks_record(self, session, regular_user):
        """Test that soft delete sets deleted_at."""
        import uuid
        job = GeminiJob(
            job_id=str(uuid.uuid4()),
            user_id=regular_user.id,
            job_type="text",
            input_data={"prompt": "Delete Me"},
            status="queued"
        )
        session.add(job)
        await session.commit()
        
        qs = QueryService(regular_user, session)
        await qs.delete().soft_delete_one(job)
        
        assert job.deleted_at is not None
    
    async def test_soft_deleted_not_in_query(self, session, regular_user):
        """Test that soft-deleted records don't appear in queries."""
        import uuid
        job = GeminiJob(
            job_id=str(uuid.uuid4()),
            user_id=regular_user.id,
            job_type="text",
            input_data={"prompt": "Delete Me"},
            status="queued"
        )
        session.add(job)
        await session.commit()
        
        qs = QueryService(regular_user, session)
        
        # Before delete
        jobs = await qs.select().execute(select(GeminiJob))
        assert len(jobs) == 1
        
        # After delete
        await qs.delete().soft_delete_one(job)
        jobs = await qs.select().execute(select(GeminiJob))
        assert len(jobs) == 0  # Should not appear
    
    async def test_admin_can_restore(self, session, admin_user, regular_user):
        """Test that admins can restore deleted records."""
        import uuid
        job = GeminiJob(
            job_id=str(uuid.uuid4()),
            user_id=regular_user.id,
            job_type="text",
            input_data={"prompt": "Restore Me"},
            status="queued"
        )
        session.add(job)
        await session.commit()
        job_id = job.id
        
        qs = QueryService(admin_user, session)
        
        # Delete
        await qs.delete().soft_delete_one(job)
        assert job.deleted_at is not None
        
        # Restore
        await qs.delete().restore_one(job)
        assert job.deleted_at is None
    
    async def test_user_cannot_restore(self, session, regular_user):
        """Test that regular users cannot restore records."""
        import uuid
        job = GeminiJob(
            job_id=str(uuid.uuid4()),
            user_id=regular_user.id,
            job_type="text",
            input_data={"prompt": "Deleted"},
            status="queued"
        )
        session.add(job)
        await session.commit()
        
        qs = QueryService(regular_user, session)
        await qs.delete().soft_delete_one(job)
        
        with pytest.raises(Exception) as exc_info:
            await qs.delete().restore_one(job)
        
        assert "403" in str(exc_info.value) or "administrator" in str(exc_info.value).lower()


# ============================================================================
# Database Initialization Tests
# ============================================================================

class TestDatabaseInitialization:
    """Test database initialization utilities."""
    
    async def test_init_database_creates_tables(self, engine):
        """Test that init_database creates all tables."""
        await init_database(engine)
        
        # Verify tables exist by querying
        async with AsyncSession(engine) as session:
            result = await session.execute(select(User))
            assert result.scalars().all() == []  # Empty but table exists
    
    async def test_reset_database_clears_data(self, engine, session, regular_user):
        """Test that reset_database clears all data."""
        import uuid
        # Add some data
        user = User(user_id=str(uuid.uuid4()), email="test@example.com", name="Test", credits=10)
        session.add(user)
        await session.commit()
        
        # Reset
        await reset_database(engine)
        
        # Verify data cleared
        async with AsyncSession(engine) as new_session:
            result = await new_session.execute(select(User))
            assert len(result.scalars().all()) == 0


# ============================================================================
# Run Tests
# ============================================================================

if __name__ == "__main__":
    pytest.main([__file__, "-v", "--tb=short"])