"""
Core Agent class for AITBC network participation
"""

import asyncio
import json
import uuid
from datetime import datetime
from typing import Dict, List, Optional, Any
from dataclasses import dataclass
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import padding

@dataclass
class AgentCapabilities:
    """Agent capability specification"""
    compute_type: str  # "inference", "training", "processing"
    gpu_memory: Optional[int] = None
    supported_models: List[str] = None
    performance_score: float = 0.0
    max_concurrent_jobs: int = 1
    specialization: Optional[str] = None
    
    def __post_init__(self):
        if self.supported_models is None:
            self.supported_models = []

@dataclass
class AgentIdentity:
    """Agent identity and cryptographic keys"""
    id: str
    name: str
    address: str
    public_key: str
    private_key: str
    
    def sign_message(self, message: Dict[str, Any]) -> str:
        """Sign a message with agent's private key"""
        message_str = json.dumps(message, sort_keys=True)
        private_key = serialization.load_pem_private_key(
            self.private_key.encode(),
            password=None
        )
        
        signature = private_key.sign(
            message_str.encode(),
            padding.PSS(
                mgf=padding.MGF1(hashes.SHA256()),
                salt_length=padding.PSS.MAX_LENGTH
            ),
            hashes.SHA256()
        )
        
        return signature.hex()
    
    def verify_signature(self, message: Dict[str, Any], signature: str) -> bool:
        """Verify a message signature"""
        message_str = json.dumps(message, sort_keys=True)
        public_key = serialization.load_pem_public_key(
            self.public_key.encode()
        )
        
        try:
            public_key.verify(
                bytes.fromhex(signature),
                message_str.encode(),
                padding.PSS(
                    mgf=padding.MGF1(hashes.SHA256()),
                    salt_length=padding.PSS.MAX_LENGTH
                ),
                hashes.SHA256()
            )
            return True
        except:
            return False

class Agent:
    """Core AITBC Agent class"""
    
    def __init__(self, identity: AgentIdentity, capabilities: AgentCapabilities):
        self.identity = identity
        self.capabilities = capabilities
        self.registered = False
        self.reputation_score = 0.0
        self.earnings = 0.0
        
    @classmethod
    def create(cls, name: str, agent_type: str, capabilities: Dict[str, Any]) -> 'Agent':
        """Create a new agent with generated identity"""
        # Generate cryptographic keys
        private_key = rsa.generate_private_key(
            public_exponent=65537,
            key_size=2048
        )
        
        public_key = private_key.public_key()
        private_pem = private_key.private_bytes(
            encoding=serialization.Encoding.PEM,
            format=serialization.PrivateFormat.PKCS8,
            encryption_algorithm=serialization.NoEncryption()
        )
        
        public_pem = public_key.public_bytes(
            encoding=serialization.Encoding.PEM,
            format=serialization.PublicFormat.SubjectPublicKeyInfo
        )
        
        # Generate agent identity
        agent_id = f"agent_{uuid.uuid4().hex[:8]}"
        address = f"0x{uuid.uuid4().hex[:40]}"
        
        identity = AgentIdentity(
            id=agent_id,
            name=name,
            address=address,
            public_key=public_pem.decode(),
            private_key=private_pem.decode()
        )
        
        # Create capabilities object
        agent_capabilities = AgentCapabilities(**capabilities)
        
        return cls(identity, agent_capabilities)
    
    async def register(self) -> bool:
        """Register the agent on the AITBC network"""
        try:
            registration_data = {
                "agent_id": self.identity.id,
                "name": self.identity.name,
                "address": self.identity.address,
                "public_key": self.identity.public_key,
                "capabilities": {
                    "compute_type": self.capabilities.compute_type,
                    "gpu_memory": self.capabilities.gpu_memory,
                    "supported_models": self.capabilities.supported_models,
                    "performance_score": self.capabilities.performance_score,
                    "max_concurrent_jobs": self.capabilities.max_concurrent_jobs,
                    "specialization": self.capabilities.specialization
                },
                "timestamp": datetime.utcnow().isoformat()
            }
            
            # Sign registration data
            signature = self.identity.sign_message(registration_data)
            registration_data["signature"] = signature
            
            # TODO: Submit to AITBC network registration endpoint
            # For now, simulate successful registration
            await asyncio.sleep(1)  # Simulate network call
            
            self.registered = True
            print(f"Agent {self.identity.id} registered successfully")
            return True
            
        except Exception as e:
            print(f"Registration failed: {e}")
            return False
    
    async def get_reputation(self) -> Dict[str, float]:
        """Get agent reputation metrics"""
        # TODO: Fetch from reputation system
        return {
            "overall_score": self.reputation_score,
            "job_success_rate": 0.95,
            "avg_response_time": 30.5,
            "client_satisfaction": 4.7
        }
    
    async def update_reputation(self, new_score: float) -> None:
        """Update agent reputation score"""
        self.reputation_score = new_score
        print(f"Reputation updated to {new_score}")
    
    async def get_earnings(self, period: str = "30d") -> Dict[str, Any]:
        """Get agent earnings information"""
        # TODO: Fetch from blockchain/payment system
        return {
            "total": self.earnings,
            "daily_average": self.earnings / 30,
            "period": period,
            "currency": "AITBC"
        }
    
    async def send_message(self, recipient_id: str, message_type: str, payload: Dict[str, Any]) -> bool:
        """Send a message to another agent"""
        message = {
            "from": self.identity.id,
            "to": recipient_id,
            "type": message_type,
            "payload": payload,
            "timestamp": datetime.utcnow().isoformat()
        }
        
        # Sign message
        signature = self.identity.sign_message(message)
        message["signature"] = signature
        
        # TODO: Send through AITBC agent messaging protocol
        print(f"Message sent to {recipient_id}: {message_type}")
        return True
    
    async def receive_message(self, message: Dict[str, Any]) -> bool:
        """Process a received message from another agent"""
        # Verify signature
        if "signature" not in message:
            return False
            
        # TODO: Verify sender's signature
        # For now, just process the message
        print(f"Received message from {message.get('from')}: {message.get('type')}")
        return True
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert agent to dictionary representation"""
        return {
            "id": self.identity.id,
            "name": self.identity.name,
            "address": self.identity.address,
            "capabilities": {
                "compute_type": self.capabilities.compute_type,
                "gpu_memory": self.capabilities.gpu_memory,
                "supported_models": self.capabilities.supported_models,
                "performance_score": self.capabilities.performance_score,
                "max_concurrent_jobs": self.capabilities.max_concurrent_jobs,
                "specialization": self.capabilities.specialization
            },
            "reputation_score": self.reputation_score,
            "registered": self.registered,
            "earnings": self.earnings
        }