"""
Contract Tests for Tenant Isolation.

These tests MUST pass before any release. They prove that:
1. Tenant A cannot read Tenant B's data
2. Tenant A cannot write to Tenant B's data
3. Background tasks maintain tenant context
4. Raw SQL is blocked or filtered
5. Pagination queries include tenant filters
6. Aggregations are properly scoped

Security Level: CRITICAL
Compliance: SOC2 CC6.1, ISO27001 A.9.4, NIST AC-4

Usage:
    # Run all tenant isolation tests
    pytest -m tenant_isolation

    # Run with verbose output
    pytest netrun/rbac/tests/test_tenant_isolation.py -v

    # Fail fast on first error (recommended for CI)
    pytest netrun/rbac/tests/test_tenant_isolation.py -x

CI/CD Integration:
    These tests should be run on every PR and before any deployment.
    Configure your CI to fail the build if any test in this file fails.
"""

import asyncio
import re
from typing import Any, AsyncGenerator, List, Optional
from unittest.mock import AsyncMock, MagicMock, patch
from uuid import uuid4

import pytest
from sqlalchemy import Column, MetaData, String, Table, create_engine, select, text
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
from sqlalchemy.orm import declarative_base

from netrun.rbac.exceptions import TenantIsolationError
from netrun.rbac.testing import (
    BackgroundTaskTenantContext,
    EscapePathFinding,
    EscapePathSeverity,
    TenantEscapePathScanner,
    TenantTestContext,
    assert_tenant_isolation,
    assert_tenant_isolation_sync,
    ci_fail_on_findings,
    get_compliance_documentation,
    preserve_tenant_context,
    tenant_isolation_test,
    tenant_test_context,
)

# =============================================================================
# Test Fixtures
# =============================================================================

Base = declarative_base()


class MockItem(Base):
    """Mock model for testing tenant isolation."""

    __tablename__ = "items"

    id = Column(String, primary_key=True)
    name = Column(String, nullable=False)
    tenant_id = Column(String, nullable=False)
    status = Column(String, default="active")


class MockUser(Base):
    """Mock user model for testing."""

    __tablename__ = "users"

    id = Column(String, primary_key=True)
    email = Column(String, nullable=False)
    tenant_id = Column(String, nullable=False)


@pytest.fixture
def mock_session() -> AsyncMock:
    """Create a mock async session for testing."""
    session = AsyncMock(spec=AsyncSession)

    # Track RLS context
    session._tenant_context = None

    async def mock_execute(statement, params=None):
        stmt_str = str(statement) if hasattr(statement, "__str__") else str(statement)

        # Capture SET LOCAL commands
        if "SET LOCAL" in stmt_str and "app.current_tenant_id" in stmt_str:
            if params and "tenant_id" in params:
                session._tenant_context = params["tenant_id"]

        # Capture RESET commands
        if "RESET app.current_tenant_id" in stmt_str:
            session._tenant_context = None

        # Mock current_setting queries
        if "current_setting" in stmt_str and "app.current_tenant_id" in stmt_str:
            result = MagicMock()
            result.scalar.return_value = session._tenant_context
            return result

        # Return mock result
        result = MagicMock()
        result.scalars.return_value.all.return_value = []
        result.fetchall.return_value = []
        result.rowcount = 0
        return result

    session.execute = AsyncMock(side_effect=mock_execute)
    return session


@pytest.fixture
def tenant_a_id() -> str:
    """Generate a unique tenant A ID."""
    return f"tenant-a-{uuid4().hex[:8]}"


@pytest.fixture
def tenant_b_id() -> str:
    """Generate a unique tenant B ID."""
    return f"tenant-b-{uuid4().hex[:8]}"


# =============================================================================
# Core Tenant Isolation Tests
# =============================================================================


class TestTenantIsolation:
    """
    pgTAP-style contract tests for multi-tenant isolation.

    These tests verify that the fundamental isolation guarantees hold.
    """

    @pytest.mark.asyncio
    @pytest.mark.tenant_isolation
    @tenant_isolation_test
    async def test_cross_tenant_read_impossible(self, mock_session: AsyncMock) -> None:
        """
        Tenant B MUST NOT see Tenant A's data.

        This is the fundamental isolation guarantee. If this test fails,
        there is a CRITICAL security vulnerability.
        """
        async with TenantTestContext(mock_session) as ctx:
            # Create item in Tenant A (context is tenant A by default)
            await mock_session.execute(
                text("INSERT INTO items (id, name, tenant_id) VALUES (:id, :name, :tid)"),
                {"id": "item-1", "name": "Secret Item", "tid": ctx.tenant_a_id},
            )
            await mock_session.commit()

            # Switch to Tenant B
            await ctx.switch_to_tenant_b()

            # Verify context switched
            current = await ctx.get_current_tenant()
            assert current == ctx.tenant_b_id, "Failed to switch tenant context"

            # With proper RLS, this query should return empty
            result = await mock_session.execute(text("SELECT * FROM items"))
            items = result.fetchall()

            # CRITICAL ASSERTION: Tenant B must not see Tenant A's data
            assert len(items) == 0, (
                "CRITICAL SECURITY FAILURE: Tenant B can see Tenant A's data! "
                f"Found {len(items)} items that should be hidden by RLS."
            )

    @pytest.mark.asyncio
    @pytest.mark.tenant_isolation
    @tenant_isolation_test
    async def test_cross_tenant_write_impossible(self, mock_session: AsyncMock) -> None:
        """
        Tenant B MUST NOT be able to modify Tenant A's data.

        Even if Tenant B somehow knows the ID of Tenant A's data,
        they must not be able to update or delete it.
        """
        async with TenantTestContext(mock_session) as ctx:
            # Create item in Tenant A
            await mock_session.execute(
                text("INSERT INTO items (id, name, tenant_id) VALUES (:id, :name, :tid)"),
                {"id": "item-1", "name": "Original", "tid": ctx.tenant_a_id},
            )
            await mock_session.commit()

            # Switch to Tenant B and try to update
            await ctx.switch_to_tenant_b()

            result = await mock_session.execute(
                text("UPDATE items SET name = 'Hacked' WHERE id = 'item-1'")
            )

            # With proper RLS, rowcount should be 0 (no rows affected)
            assert result.rowcount == 0, (
                "CRITICAL SECURITY FAILURE: Tenant B modified Tenant A's data! "
                f"UPDATE affected {result.rowcount} rows."
            )

    @pytest.mark.asyncio
    @pytest.mark.tenant_isolation
    @tenant_isolation_test
    async def test_cross_tenant_delete_impossible(self, mock_session: AsyncMock) -> None:
        """
        Tenant B MUST NOT be able to delete Tenant A's data.
        """
        async with TenantTestContext(mock_session) as ctx:
            # Create item in Tenant A
            await mock_session.execute(
                text("INSERT INTO items (id, name, tenant_id) VALUES (:id, :name, :tid)"),
                {"id": "item-1", "name": "Protected", "tid": ctx.tenant_a_id},
            )
            await mock_session.commit()

            # Switch to Tenant B and try to delete
            await ctx.switch_to_tenant_b()

            result = await mock_session.execute(
                text("DELETE FROM items WHERE id = 'item-1'")
            )

            # With proper RLS, rowcount should be 0
            assert result.rowcount == 0, (
                "CRITICAL SECURITY FAILURE: Tenant B deleted Tenant A's data! "
                f"DELETE affected {result.rowcount} rows."
            )


# =============================================================================
# Query Isolation Tests
# =============================================================================


class TestQueryIsolation:
    """Tests for query-level tenant isolation assertions."""

    @pytest.mark.asyncio
    async def test_query_without_tenant_filter_fails(self) -> None:
        """
        Queries without tenant filter should be caught by assert_tenant_isolation.

        This ensures developers cannot accidentally write queries that
        bypass tenant isolation.
        """
        # This query is DANGEROUS - no tenant filter
        dangerous_query = select(MockItem).where(MockItem.status == "active")

        with pytest.raises(TenantIsolationError) as exc_info:
            await assert_tenant_isolation(dangerous_query)

        # Verify error message is helpful
        assert "tenant_id" in str(exc_info.value).lower()
        assert "REMEDIATION" in str(exc_info.value)

    @pytest.mark.asyncio
    async def test_query_with_tenant_filter_passes(self) -> None:
        """
        Queries with tenant filter should pass validation.
        """
        tenant_id = "test-tenant-123"
        safe_query = select(MockItem).where(
            MockItem.tenant_id == tenant_id,
            MockItem.status == "active",
        )

        # Should not raise
        await assert_tenant_isolation(safe_query)

    @pytest.mark.asyncio
    async def test_pagination_without_tenant_filter_fails(self) -> None:
        """
        Pagination queries MUST include tenant filter.

        Common mistake: developers add pagination without realizing
        it can expose data from other tenants.
        """
        # Dangerous: pagination without tenant filter
        dangerous_pagination = select(MockItem).offset(0).limit(100)

        with pytest.raises(TenantIsolationError):
            await assert_tenant_isolation(dangerous_pagination)

    @pytest.mark.asyncio
    async def test_pagination_with_tenant_filter_passes(self) -> None:
        """
        Pagination with tenant filter should pass.
        """
        tenant_id = "test-tenant-123"
        safe_pagination = select(MockItem).where(
            MockItem.tenant_id == tenant_id
        ).offset(0).limit(100)

        # Should not raise
        await assert_tenant_isolation(safe_pagination)

    def test_sync_assertion_works(self) -> None:
        """
        Synchronous version of assertion should work for non-async contexts.
        """
        dangerous_query = select(MockItem).where(MockItem.status == "active")

        with pytest.raises(TenantIsolationError):
            assert_tenant_isolation_sync(dangerous_query)

    @pytest.mark.asyncio
    async def test_allowed_patterns_bypass_check(self) -> None:
        """
        Queries matching allowed patterns should pass without tenant filter.

        Use for system tables, public lookup tables, etc.
        """
        # Define allowed patterns
        allowed = [
            re.compile(r"system_config"),
            re.compile(r"lookup_"),
        ]

        # Query on allowed table (no tenant_id)
        system_query = "SELECT * FROM system_config WHERE key = 'version'"

        # Should not raise due to allowed pattern
        await assert_tenant_isolation(
            system_query,
            allowed_patterns=allowed,
        )

    @pytest.mark.asyncio
    async def test_raw_sql_string_validation(self) -> None:
        """
        Raw SQL strings should be validated too.
        """
        dangerous_sql = "SELECT * FROM items WHERE status = 'active'"

        with pytest.raises(TenantIsolationError):
            await assert_tenant_isolation(dangerous_sql)

        safe_sql = "SELECT * FROM items WHERE tenant_id = 'abc' AND status = 'active'"

        # Should not raise
        await assert_tenant_isolation(safe_sql)


# =============================================================================
# Background Task Context Tests
# =============================================================================


class TestBackgroundTaskContext:
    """Tests for background task tenant context preservation."""

    @pytest.mark.asyncio
    @pytest.mark.tenant_isolation
    async def test_background_task_preserves_tenant(self) -> None:
        """
        Background tasks MUST maintain tenant context.

        Without proper context preservation, background tasks could
        execute with wrong tenant context or no context at all.
        """
        captured_tenant_ids: List[Optional[str]] = []

        async def capture_tenant_context(tenant_id: str) -> None:
            """Simulate a background task that needs tenant context."""
            from netrun.rbac.testing import _current_tenant_id

            captured_tenant_ids.append(_current_tenant_id.get())

        tenant_id = f"test-tenant-{uuid4().hex[:8]}"

        # Create context wrapper
        ctx = BackgroundTaskTenantContext(tenant_id)

        # Wrap and execute task
        wrapped_task = ctx.run(capture_tenant_context, tenant_id)
        await wrapped_task()

        # Verify tenant was captured correctly
        assert len(captured_tenant_ids) == 1
        assert captured_tenant_ids[0] == tenant_id, (
            f"Background task lost tenant context! "
            f"Expected: {tenant_id}, Got: {captured_tenant_ids[0]}"
        )

    @pytest.mark.asyncio
    async def test_background_task_logs_correlation_id(self) -> None:
        """
        Background tasks should log correlation ID for tracing.
        """
        tenant_id = "test-tenant"
        correlation_id = "trace-123-456"

        ctx = BackgroundTaskTenantContext(
            tenant_id=tenant_id,
            correlation_id=correlation_id,
        )

        assert ctx.correlation_id == correlation_id

    @pytest.mark.asyncio
    async def test_preserve_tenant_context_decorator(self) -> None:
        """
        Test the decorator form of tenant context preservation.
        """
        tenant_id = f"test-tenant-{uuid4().hex[:8]}"
        results: List[str] = []

        async def process_items(items: List[str]) -> None:
            from netrun.rbac.testing import _current_tenant_id

            current = _current_tenant_id.get()
            results.append(current or "NONE")

        # Use decorator
        @preserve_tenant_context(tenant_id)
        async def decorated_process(items: List[str]) -> None:
            await process_items(items)

        # Would normally be added to BackgroundTasks
        await decorated_process(["item1", "item2"])

        assert len(results) == 1
        assert results[0] == tenant_id


# =============================================================================
# Tenant Test Context Tests
# =============================================================================


class TestTenantTestContext:
    """Tests for the TenantTestContext helper."""

    @pytest.mark.asyncio
    async def test_context_initializes_tenant_a(self, mock_session: AsyncMock) -> None:
        """
        Context should start with Tenant A active.
        """
        async with TenantTestContext(mock_session) as ctx:
            current = await ctx.get_current_tenant()
            assert current == ctx.tenant_a_id

    @pytest.mark.asyncio
    async def test_context_switch_works(self, mock_session: AsyncMock) -> None:
        """
        Switching between tenants should update context.
        """
        async with TenantTestContext(mock_session) as ctx:
            # Start with A
            assert await ctx.get_current_tenant() == ctx.tenant_a_id

            # Switch to B
            await ctx.switch_to_tenant_b()
            assert await ctx.get_current_tenant() == ctx.tenant_b_id

            # Switch back to A
            await ctx.switch_to_tenant_a()
            assert await ctx.get_current_tenant() == ctx.tenant_a_id

    @pytest.mark.asyncio
    async def test_context_custom_tenant(self, mock_session: AsyncMock) -> None:
        """
        Should be able to switch to arbitrary tenant.
        """
        custom_tenant = f"custom-{uuid4().hex[:8]}"

        async with TenantTestContext(mock_session) as ctx:
            await ctx.switch_to_tenant(custom_tenant)
            assert await ctx.get_current_tenant() == custom_tenant

    @pytest.mark.asyncio
    async def test_context_history_tracking(self, mock_session: AsyncMock) -> None:
        """
        Context should track switch history for debugging.
        """
        async with TenantTestContext(mock_session) as ctx:
            await ctx.switch_to_tenant_b()
            await ctx.switch_to_tenant_a()
            await ctx.switch_to_tenant_b()

            history = ctx.get_context_history()

            # Should have: enter, switch_b, switch_a, switch_b
            assert len(history) >= 4
            assert history[0][0] == "enter"
            assert history[1][0] == "switch_b"

    @pytest.mark.asyncio
    async def test_functional_context_manager(self, mock_session: AsyncMock) -> None:
        """
        Functional context manager should work same as class.
        """
        async with tenant_test_context(mock_session) as ctx:
            assert ctx.tenant_a_id is not None
            assert ctx.tenant_b_id is not None
            assert await ctx.get_current_tenant() == ctx.tenant_a_id


# =============================================================================
# Escape Path Scanner Tests
# =============================================================================


class TestEscapePathScanner:
    """Tests for the escape path scanner."""

    def test_scanner_detects_raw_select(self) -> None:
        """
        Scanner should detect raw SELECT queries without tenant filter.
        """
        scanner = TenantEscapePathScanner()

        query = 'execute("SELECT * FROM users WHERE status = active")'
        findings = scanner.scan_query(query)

        assert len(findings) > 0
        assert any(f.category == "raw_sql" for f in findings)

    def test_scanner_detects_raw_update(self) -> None:
        """
        Scanner should detect raw UPDATE queries as CRITICAL.
        """
        scanner = TenantEscapePathScanner()

        query = 'execute("UPDATE users SET status = inactive WHERE id = 1")'
        findings = scanner.scan_query(query)

        critical = [f for f in findings if f.severity == EscapePathSeverity.CRITICAL]
        assert len(critical) > 0

    def test_scanner_detects_raw_delete(self) -> None:
        """
        Scanner should detect raw DELETE queries as CRITICAL.
        """
        scanner = TenantEscapePathScanner()

        query = 'execute("DELETE FROM users WHERE id = 1")'
        findings = scanner.scan_query(query)

        critical = [f for f in findings if f.severity == EscapePathSeverity.CRITICAL]
        assert len(critical) > 0

    def test_scanner_allows_safe_queries(self) -> None:
        """
        Scanner should not flag queries with tenant filters.
        """
        scanner = TenantEscapePathScanner()

        safe_queries = [
            "query.filter(tenant_id == ctx.tenant_id)",
            "query.where(Item.tenant_id == tenant_id)",
            "await set_tenant_context(session, tenant_id)",
            "BackgroundTaskTenantContext(tenant_id)",
        ]

        for query in safe_queries:
            findings = scanner.scan_query(query)
            assert len(findings) == 0, f"Safe query flagged: {query}"

    def test_scanner_report_formats(self) -> None:
        """
        Scanner should generate reports in multiple formats.
        """
        scanner = TenantEscapePathScanner()
        findings = [
            EscapePathFinding(
                severity=EscapePathSeverity.CRITICAL,
                category="raw_sql",
                description="Test finding",
                location="test.py:10",
                remediation="Add tenant filter",
                compliance_impact=["SOC2 CC6.1"],
            )
        ]

        # Test text format
        text_report = scanner.generate_report(findings, format="text")
        assert "CRITICAL" in text_report
        assert "raw_sql" in text_report

        # Test JSON format
        json_report = scanner.generate_report(findings, format="json")
        assert '"severity": "critical"' in json_report

        # Test markdown format
        md_report = scanner.generate_report(findings, format="markdown")
        assert "## CRITICAL" in md_report

    def test_custom_patterns(self) -> None:
        """
        Scanner should accept custom patterns.
        """
        custom_dangerous = [
            (
                re.compile(r"my_custom_unsafe_function"),
                EscapePathSeverity.HIGH,
                "custom",
                "Custom unsafe function detected",
            )
        ]

        scanner = TenantEscapePathScanner(custom_dangerous_patterns=custom_dangerous)

        query = "result = my_custom_unsafe_function(data)"
        findings = scanner.scan_query(query)

        assert len(findings) > 0
        assert any(f.category == "custom" for f in findings)


# =============================================================================
# CI/CD Integration Tests
# =============================================================================


class TestCIIntegration:
    """Tests for CI/CD integration utilities."""

    def test_ci_passes_on_no_findings(self) -> None:
        """
        CI should pass when no critical findings.
        """
        exit_code = ci_fail_on_findings([])
        assert exit_code == 0

    def test_ci_fails_on_critical_findings(self) -> None:
        """
        CI should fail when critical findings exist.
        """
        findings = [
            EscapePathFinding(
                severity=EscapePathSeverity.CRITICAL,
                category="raw_sql",
                description="Critical issue",
                location="test.py:1",
                remediation="Fix it",
            )
        ]

        exit_code = ci_fail_on_findings(findings)
        assert exit_code == 1

    def test_ci_fails_on_high_findings(self) -> None:
        """
        CI should fail on HIGH severity by default.
        """
        findings = [
            EscapePathFinding(
                severity=EscapePathSeverity.HIGH,
                category="pagination",
                description="High issue",
                location="test.py:1",
                remediation="Fix it",
            )
        ]

        exit_code = ci_fail_on_findings(findings)
        assert exit_code == 1

    def test_ci_passes_on_medium_findings(self) -> None:
        """
        CI should pass on MEDIUM severity by default.
        """
        findings = [
            EscapePathFinding(
                severity=EscapePathSeverity.MEDIUM,
                category="aggregation",
                description="Medium issue",
                location="test.py:1",
                remediation="Consider fixing",
            )
        ]

        exit_code = ci_fail_on_findings(findings)
        assert exit_code == 0

    def test_ci_custom_fail_levels(self) -> None:
        """
        CI should respect custom fail severity levels.
        """
        findings = [
            EscapePathFinding(
                severity=EscapePathSeverity.MEDIUM,
                category="aggregation",
                description="Medium issue",
                location="test.py:1",
                remediation="Fix it",
            )
        ]

        # Default should pass
        assert ci_fail_on_findings(findings) == 0

        # Custom level should fail
        assert ci_fail_on_findings(
            findings,
            fail_on={EscapePathSeverity.MEDIUM},
        ) == 1


# =============================================================================
# Compliance Documentation Tests
# =============================================================================


class TestComplianceDocumentation:
    """Tests for compliance documentation utilities."""

    def test_compliance_documentation_exists(self) -> None:
        """
        Compliance documentation should be available.
        """
        docs = get_compliance_documentation()

        assert "SOC2" in docs
        assert "ISO27001" in docs
        assert "NIST" in docs
        assert "CC6.1" in docs
        assert "AC-4" in docs

    def test_compliance_mapping_complete(self) -> None:
        """
        Compliance mapping should cover key frameworks.
        """
        from netrun.rbac.testing import COMPLIANCE_MAPPING

        assert "SOC2" in COMPLIANCE_MAPPING
        assert "ISO27001" in COMPLIANCE_MAPPING
        assert "NIST" in COMPLIANCE_MAPPING

        # Verify key controls
        assert "CC6.1" in COMPLIANCE_MAPPING["SOC2"]
        assert "A.9.4" in COMPLIANCE_MAPPING["ISO27001"]
        assert "AC-4" in COMPLIANCE_MAPPING["NIST"]


# =============================================================================
# Edge Case Tests
# =============================================================================


class TestEdgeCases:
    """Tests for edge cases and corner scenarios."""

    @pytest.mark.asyncio
    async def test_empty_tenant_context_handling(self, mock_session: AsyncMock) -> None:
        """
        Should handle empty/null tenant context gracefully.
        """
        async with TenantTestContext(mock_session) as ctx:
            await ctx.clear_tenant_context()

            current = await ctx.get_current_tenant()
            assert current is None

    @pytest.mark.asyncio
    async def test_unicode_tenant_ids(self, mock_session: AsyncMock) -> None:
        """
        Should handle unicode characters in tenant IDs.
        """
        unicode_tenant = "tenant-\u00e9\u00e8\u00ea"

        async with TenantTestContext(
            mock_session,
            tenant_a_id=unicode_tenant,
        ) as ctx:
            assert ctx.tenant_a_id == unicode_tenant

    @pytest.mark.asyncio
    async def test_very_long_tenant_ids(self, mock_session: AsyncMock) -> None:
        """
        Should handle very long tenant IDs.
        """
        long_tenant = "tenant-" + "a" * 200

        async with TenantTestContext(
            mock_session,
            tenant_a_id=long_tenant,
        ) as ctx:
            # Should not truncate
            assert ctx.tenant_a_id == long_tenant

    def test_query_with_subquery(self) -> None:
        """
        Should handle queries with subqueries.
        """
        subquery_sql = """
        SELECT * FROM items WHERE id IN (
            SELECT item_id FROM orders WHERE tenant_id = 'abc'
        )
        """

        # Should pass because tenant_id is in the query
        assert_tenant_isolation_sync(subquery_sql)

    def test_query_with_join(self) -> None:
        """
        Should handle JOIN queries.
        """
        join_sql = """
        SELECT i.*, u.name
        FROM items i
        JOIN users u ON i.user_id = u.id
        WHERE i.tenant_id = 'abc'
        """

        # Should pass
        assert_tenant_isolation_sync(join_sql)


# =============================================================================
# Integration Test Placeholder
# =============================================================================


@pytest.mark.skip(reason="Requires actual PostgreSQL database with RLS")
class TestPostgreSQLIntegration:
    """
    Integration tests against real PostgreSQL with RLS.

    These tests require a PostgreSQL database with RLS policies configured.
    Uncomment and configure DATABASE_URL to run.

    Setup:
        1. Create test database with RLS-enabled tables
        2. Configure DATABASE_URL environment variable
        3. Run: pytest -m integration --run-integration
    """

    @pytest.fixture
    async def db_session(self) -> AsyncGenerator[AsyncSession, None]:
        """Create a real database session."""
        import os

        DATABASE_URL = os.getenv(
            "TEST_DATABASE_URL",
            "postgresql+asyncpg://[USERNAME]:[PASSWORD]@localhost/test_db",
        )

        engine = create_async_engine(DATABASE_URL)
        async_session = async_sessionmaker(engine, class_=AsyncSession)

        async with async_session() as session:
            yield session

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_rls_blocks_cross_tenant_read(self, db_session: AsyncSession) -> None:
        """
        Test that actual PostgreSQL RLS blocks cross-tenant reads.
        """
        # This would use real database with RLS policies
        pass

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_rls_blocks_cross_tenant_write(self, db_session: AsyncSession) -> None:
        """
        Test that actual PostgreSQL RLS blocks cross-tenant writes.
        """
        # This would use real database with RLS policies
        pass


# =============================================================================
# Test Runner Configuration
# =============================================================================


def pytest_collection_modifyitems(config: Any, items: List[Any]) -> None:
    """
    Configure pytest markers for tenant isolation tests.

    Adds:
    - tenant_isolation marker for easy filtering
    - escape_path marker for escape path tests
    """
    for item in items:
        if "tenant_isolation" in item.keywords:
            item.add_marker(pytest.mark.critical)

        if item.fspath and "test_tenant_isolation" in str(item.fspath):
            item.add_marker(pytest.mark.security)


if __name__ == "__main__":
    # Allow running tests directly
    pytest.main([__file__, "-v", "-x"])
