#include <string>
#include <vector>
#include <set>
#include <regex>

namespace dbal {
namespace daemon {

class SecurityManager {
public:
    SecurityManager() {
        // Initialize with dangerous patterns
        dangerous_patterns_ = {
            "DROP TABLE",
            "DROP DATABASE",
            "TRUNCATE",
            "DELETE FROM.*WHERE 1=1",
            "'; --",
            "UNION SELECT",
            "../",
            "/etc/passwd",
            "eval(",
            "exec(",
            "system(",
            "__import__"
        };
    }
    
    bool isSafe(const std::string& query) const {
        std::string upper_query = query;
        std::transform(upper_query.begin(), upper_query.end(), upper_query.begin(), ::toupper);
        
        for (const auto& pattern : dangerous_patterns_) {
            if (upper_query.find(pattern) != std::string::npos) {
                return false;
            }
        }
        
        return true;
    }
    
    bool validateAccess(const std::string& user, const std::string& resource) const {
        // In a real implementation, this would check ACL rules
        // For now, just a stub
        return true;
    }
    
    std::string sanitize(const std::string& input) const {
        std::string sanitized = input;
        
        // Remove null bytes
        sanitized.erase(std::remove(sanitized.begin(), sanitized.end(), '\0'), sanitized.end());
        
        // Escape single quotes
        size_t pos = 0;
        while ((pos = sanitized.find("'", pos)) != std::string::npos) {
            sanitized.replace(pos, 1, "''");
            pos += 2;
        }
        
        return sanitized;
    }
    
private:
    std::vector<std::string> dangerous_patterns_;
};

}
}
