"""Test specifications for security architecture."""

import pytest
from typing import Protocol, Optional, Dict, Any


# Security component interfaces (for TDD)
class SqlInjectionPrevention(Protocol):
    """Interface for SQL injection prevention."""
    
    def validate_query(self, query: str) -> bool:
        """Validate query for SQL injection attempts."""
        ...
    
    def sanitize_parameters(self, params: list) -> list:
        """Sanitize query parameters."""
        ...


class QueryFilter(Protocol):
    """Interface for query filtering."""
    
    def is_allowed(self, query: str) -> tuple[bool, str]:
        """Check if query is allowed by filters."""
        ...


class RateLimiter(Protocol):
    """Interface for rate limiting."""
    
    async def check_rate_limit(self, client_id: str) -> tuple[bool, str]:
        """Check if request is within rate limits."""
        ...


class SecurityManager(Protocol):
    """Main security manager interface."""
    
    async def validate_request(
        self,
        query: str,
        params: Optional[list] = None,
        client_id: Optional[str] = None
    ) -> tuple[bool, str]:
        """Validate request through all security layers."""
        ...


class TestSecurityArchitecture:
    """Test security architecture design."""

    def test_security_manager_interface(self):
        """Test that SecurityManager properly coordinates all security components."""
        # This test defines the expected interface
        class MockSecurityManager:
            def __init__(
                self,
                sql_injection: SqlInjectionPrevention,
                query_filter: QueryFilter,
                rate_limiter: RateLimiter
            ):
                self.sql_injection = sql_injection
                self.query_filter = query_filter
                self.rate_limiter = rate_limiter
            
            async def validate_request(
                self,
                query: str,
                params: Optional[list] = None,
                client_id: Optional[str] = None
            ) -> tuple[bool, str]:
                # 1. Check rate limit first (fail fast)
                if client_id:
                    allowed, reason = await self.rate_limiter.check_rate_limit(client_id)
                    if not allowed:
                        return False, f"Rate limit exceeded: {reason}"
                
                # 2. Validate SQL injection
                if not self.sql_injection.validate_query(query):
                    return False, "SQL injection detected"
                
                # 3. Check query filters
                allowed, reason = self.query_filter.is_allowed(query)
                if not allowed:
                    return False, f"Query blocked by filter: {reason}"
                
                return True, "OK"

    def test_security_configuration_schema(self):
        """Test security configuration structure."""
        expected_config = {
            "sql_injection": {
                "enabled": True,
                "strict_mode": True,
                "allowed_functions": ["COUNT", "SUM", "AVG"],
                "blocked_functions": ["LOAD_FILE", "OUTFILE", "DUMPFILE"],
            },
            "query_filter": {
                "enabled": True,
                "mode": "whitelist",  # or "blacklist"
                "whitelist_tables": ["users", "orders", "products"],
                "blacklist_tables": ["passwords", "api_keys"],
                "whitelist_patterns": ["^SELECT\\s+.*"],
                "blacklist_patterns": [".*information_schema.*"],
            },
            "rate_limiting": {
                "enabled": True,
                "per_minute": 60,
                "per_hour": 1000,
                "burst_size": 20,
                "concurrent_queries": 10,
                "cooldown_seconds": 60,
            },
            "audit_logging": {
                "enabled": True,
                "log_successful": False,
                "log_blocked": True,
                "log_errors": True,
                "include_parameters": False,
            }
        }
        
        # This structure should be used for configuration
        assert isinstance(expected_config, dict)

    def test_security_middleware_chain(self):
        """Test security middleware chain design."""
        # Expected middleware execution order
        middleware_chain = [
            "RateLimitMiddleware",      # 1. Check rate limits (fail fast)
            "AuditLoggingMiddleware",    # 2. Log attempt
            "SqlInjectionMiddleware",    # 3. Validate SQL injection
            "QueryFilterMiddleware",     # 4. Apply filters
            "ParameterSanitizer",        # 5. Sanitize parameters
            "QueryExecutor",             # 6. Execute query
        ]
        
        # Each middleware should have consistent interface
        class SecurityMiddleware:
            async def process(self, request: Dict[str, Any], next_handler) -> Dict[str, Any]:
                # Pre-processing
                # ...
                
                # Call next middleware
                response = await next_handler(request)
                
                # Post-processing
                # ...
                
                return response

    def test_security_error_types(self):
        """Test security-specific error types."""
        # Define expected error hierarchy
        class SecurityError(Exception):
            """Base security error."""
            pass
        
        class SqlInjectionError(SecurityError):
            """SQL injection detected."""
            pass
        
        class RateLimitError(SecurityError):
            """Rate limit exceeded."""
            def __init__(self, retry_after: int):
                self.retry_after = retry_after
        
        class QueryFilterError(SecurityError):
            """Query blocked by filter."""
            def __init__(self, filter_type: str, pattern: str):
                self.filter_type = filter_type
                self.pattern = pattern
        
        # Test error creation
        error = RateLimitError(retry_after=60)
        assert error.retry_after == 60

    def test_security_context(self):
        """Test security context for request tracking."""
        class SecurityContext:
            """Security context for a request."""
            
            def __init__(
                self,
                request_id: str,
                client_id: Optional[str] = None,
                tenant_id: Optional[str] = None,
                ip_address: Optional[str] = None,
            ):
                self.request_id = request_id
                self.client_id = client_id
                self.tenant_id = tenant_id
                self.ip_address = ip_address
                self.start_time = None
                self.security_checks = []
            
            def add_check(self, check_name: str, passed: bool, reason: str = ""):
                """Record security check result."""
                self.security_checks.append({
                    "check": check_name,
                    "passed": passed,
                    "reason": reason,
                    "timestamp": "..."
                })
        
        # Test context usage
        ctx = SecurityContext("req-123", client_id="client-1")
        ctx.add_check("rate_limit", True)
        ctx.add_check("sql_injection", False, "Multiple statements detected")
        
        assert len(ctx.security_checks) == 2
        assert not ctx.security_checks[1]["passed"]

    def test_security_metrics_interface(self):
        """Test security metrics collection interface."""
        class SecurityMetrics:
            """Interface for security metrics."""
            
            def __init__(self):
                self.counters = {}
                self.timers = {}
            
            def increment(self, metric: str, value: int = 1, tags: Optional[Dict] = None):
                """Increment a counter metric."""
                pass
            
            def timing(self, metric: str, duration: float, tags: Optional[Dict] = None):
                """Record a timing metric."""
                pass
            
            def gauge(self, metric: str, value: float, tags: Optional[Dict] = None):
                """Set a gauge metric."""
                pass
        
        # Expected metrics to collect
        expected_metrics = [
            "security.requests.total",
            "security.requests.allowed",
            "security.requests.blocked",
            "security.sql_injection.attempts",
            "security.rate_limit.exceeded",
            "security.query_filter.blocked",
            "security.validation.duration",
        ]

    def test_security_plugin_system(self):
        """Test extensible security plugin system."""
        class SecurityPlugin:
            """Base class for security plugins."""
            
            def __init__(self, config: Dict[str, Any]):
                self.config = config
                self.enabled = config.get("enabled", True)
            
            async def initialize(self):
                """Initialize the plugin."""
                pass
            
            async def validate(self, request: Dict[str, Any]) -> tuple[bool, str]:
                """Validate request."""
                raise NotImplementedError
        
        # Example custom plugin
        class CustomBlacklistPlugin(SecurityPlugin):
            """Custom blacklist plugin."""
            
            async def validate(self, request: Dict[str, Any]) -> tuple[bool, str]:
                query = request.get("query", "")
                for blocked in self.config.get("blocked_terms", []):
                    if blocked in query.lower():
                        return False, f"Blocked term: {blocked}"
                return True, "OK"

    def test_security_testing_utilities(self):
        """Test utilities for security testing."""
        class SecurityTestUtils:
            """Utilities for testing security features."""
            
            @staticmethod
            def generate_sql_injection_payloads() -> list[str]:
                """Generate common SQL injection test payloads."""
                return [
                    "' OR '1'='1",
                    "'; DROP TABLE users; --",
                    "1' UNION SELECT * FROM passwords--",
                    "admin'--",
                    "1' AND SLEEP(5)--",
                ]
            
            @staticmethod
            def generate_safe_queries() -> list[str]:
                """Generate safe query examples."""
                return [
                    "SELECT * FROM users WHERE id = %s",
                    "INSERT INTO logs (message) VALUES (%s)",
                    "UPDATE users SET last_login = NOW() WHERE id = %s",
                ]
            
            @staticmethod
            async def simulate_attack(
                security_manager: SecurityManager,
                attack_type: str = "sql_injection"
            ) -> Dict[str, Any]:
                """Simulate various attack scenarios."""
                # Implementation would simulate attacks and return results
                pass