"""Phase 23: Verifiable Credentials (VC) Manager.

Issues and verifies W3C Verifiable Credentials and Presentations.
"""

import logging
import json
from typing import List, Dict, Any
from agent.gemini_adapter import GeminiAdapter

logger = logging.getLogger(__name__)

class VCManager:
    def __init__(self):
        self.adapter = GeminiAdapter()

    def issue_credential(self, subject_did: str, claims: Dict[str, Any]) -> Dict[str, Any]:
        """Issues a Verifiable Credential for a given subject and set of claims."""
        logger.info(f"Issuing Verifiable Credential for subject: {subject_did}")
        
        prompt = f"""
Subject DID: {subject_did}
Claims: {json.dumps(claims, indent=2)}

Please generate a W3C-compliant Verifiable Credential for these claims.
Include the proof (signature) metadata and the credential schema.
Identify the 'Privacy-Preserving Safeguards' implemented in this credential.

Format the output as JSON:
{{
  "credential": {{
    "@context": [...],
    "type": ["VerifiableCredential", "..."],
    "issuer": "did:key:...",
    "issuanceDate": "...",
    "credentialSubject": {{
      "id": "{subject_did}",
      ...
    }},
    "proof": {{...}}
  }},
  "privacy_safeguards": [...],
  "verification_directives": "..."
}}
"""
        result = self.adapter.generate(
            model="gemini-3.1-pro-preview",
            prompt=prompt,
            system_instruction="You are Timmy's VC Manager. Your goal is to ensure Timmy can issue and verify credentials with absolute cryptographic certainty.",
            thinking=True,
            response_mime_type="application/json"
        )
        
        vc_data = json.loads(result["text"])
        return vc_data