"""
Pre-flight validation for SQL generation.
"""

import logging

from ...types import GenerationRequest, ValidationResult

logger = logging.getLogger(__name__)


class SQLPreflightValidator:
    """Handles pre-flight validation checks for SQL generation."""
    
    def __init__(self, enforce_read_only: bool = False):
        """
        Initialize the preflight validator.
        
        Args:
            enforce_read_only: If True, warn about potentially dangerous operations
        """
        self.enforce_read_only = enforce_read_only
    
    def validate(self, request: GenerationRequest) -> ValidationResult:
        """
        Perform pre-flight validation checks.
        
        Args:
            request: The generation request to validate
            
        Returns:
            ValidationResult with validation status and any errors/warnings
        """
        errors: list[str] = []
        warnings: list[str] = []
        
        # Basic validation - check if natural language input exists
        if not request.natural_language or len(request.natural_language.strip()) < 3:
            errors.append("Natural language input is required and must be at least 3 characters")
        
        # TODO: Add more sophisticated validation later
        # - Context validation
        # - Constraint validation  
        # - Read-only mode checks
        
        is_valid = len(errors) == 0
        return ValidationResult(is_valid=is_valid, errors=errors, warnings=warnings)