import asyncio
import uuid
from typing import List, Optional
from app.models.schemas import TTP, Vulnerability, VulnerabilityStatus
from loguru import logger

class ValidationService:
    """
    Engine for re-validating discovered risks using TTPs (Tactics, Techniques, and Procedures).
    Inspired by Penligent's TTP Library.
    """
    def __init__(self):
        # Predefined TTP Library
        self.ttp_library: List[TTP] = [
            TTP(
                id="TTP-SQLI-001",
                name="Error-based SQLi Verification",
                category="Injection",
                description="Verifies SQL injection by triggering database-specific errors.",
                steps=["Send single quote", "Check for SQL syntax error", "Send balanced quote"]
            ),
            TTP(
                id="TTP-XSS-001",
                name="Reflected XSS Execution",
                category="Injection",
                description="Verifies XSS by injecting a unique script tag and checking echo.",
                steps=["Inject <script>alert(1)</script>", "Search for literal tag in response"]
            )
        ]

    async def verify_vulnerability(self, vuln: Vulnerability) -> VulnerabilityStatus:
        """
        Performs at least 3 rounds of verification using matched TTP.
        """
        logger.info(f"Re-validating risk: {vuln.type} using TTP Engine")
        
        # Match TTP (simplified logic)
        ttp = next((t for t in self.ttp_library if t.category.lower() in vuln.type.lower()), None)
        
        if not ttp:
            logger.warning(f"No matching TTP found for {vuln.type}. Creating dynamic TTP...")
            ttp = TTP(id=str(uuid.uuid4()), name=f"Dynamic {vuln.type} Verifier", category="Misc", description="Auto-generated", steps=["Probe", "Confirm"])

        # Perform 3 rounds of verification (simulated)
        for round_num in range(1, 4):
            logger.info(f"Verification Round {round_num}/3 for {vuln.id}")
            await asyncio.sleep(1.5) # Simulate network activity
            
        # Decision (mocked)
        logger.success(f"Verification completed for {vuln.id}")
        return VulnerabilityStatus.VERIFIED

validation_service = ValidationService()