import httpx
import uuid
from typing import Dict, Any
from app.core.config import settings


class PaymentService:
    def __init__(self):
        self.api_url = settings.PAYMENT_PROVIDER_API_URL
        self.api_key = settings.PAYMENT_PROVIDER_API_KEY
    
    def generate_payment_account(self, amount: float) -> Dict[str, Any]:
        """
        Generate payment account details from payment provider.
        In a real implementation, this would call the payment provider's API.
        For demo purposes, we'll return mock data.
        """
        
        if not self.api_url or not self.api_key:
            # Mock payment details for demo
            return {
                "account_number": f"ACC{uuid.uuid4().hex[:10].upper()}",
                "account_name": "CRYPTO P2P TRADING PLATFORM",
                "bank_name": "DEMO BANK",
                "reference": f"REF{uuid.uuid4().hex[:12].upper()}",
                "amount": amount,
                "expires_in_minutes": 30
            }
        
        # Real implementation would make API call to payment provider
        try:
            headers = {
                "Authorization": f"Bearer {self.api_key}",
                "Content-Type": "application/json"
            }
            
            payload = {
                "amount": amount,
                "currency": "NGN",  # Assuming Nigerian Naira, adjust as needed
                "purpose": "cryptocurrency_purchase",
                "expires_in_minutes": 30
            }
            
            with httpx.Client() as client:
                response = client.post(
                    f"{self.api_url}/generate-account",
                    headers=headers,
                    json=payload,
                    timeout=30
                )
                response.raise_for_status()
                return response.json()
                
        except Exception:
            # Fallback to mock data if API fails
            return {
                "account_number": f"ACC{uuid.uuid4().hex[:10].upper()}",
                "account_name": "CRYPTO P2P TRADING PLATFORM",
                "bank_name": "DEMO BANK",
                "reference": f"REF{uuid.uuid4().hex[:12].upper()}",
                "amount": amount,
                "expires_in_minutes": 30
            }
    
    def verify_payment(self, reference: str) -> Dict[str, Any]:
        """
        Verify payment status with payment provider.
        Returns payment status and details.
        """
        
        if not self.api_url or not self.api_key:
            # Mock verification for demo
            return {
                "status": "confirmed",
                "reference": reference,
                "amount": 0.0,
                "transaction_id": f"TXN{uuid.uuid4().hex[:12].upper()}",
                "confirmed_at": "2024-01-01T00:00:00Z"
            }
        
        try:
            headers = {
                "Authorization": f"Bearer {self.api_key}",
                "Content-Type": "application/json"
            }
            
            with httpx.Client() as client:
                response = client.get(
                    f"{self.api_url}/verify-payment/{reference}",
                    headers=headers,
                    timeout=30
                )
                response.raise_for_status()
                return response.json()
                
        except Exception as e:
            return {
                "status": "pending",
                "reference": reference,
                "error": str(e)
            }
    
    def webhook_handler(self, payload: Dict[str, Any]) -> Dict[str, Any]:
        """
        Handle webhook notifications from payment provider.
        This would be called when payment status changes.
        """
        # In a real implementation, you would:
        # 1. Verify webhook signature
        # 2. Extract payment reference and status
        # 3. Update order status in database
        # 4. Trigger automatic crypto release if payment is confirmed
        
        reference = payload.get("reference")
        status = payload.get("status")
        
        if status == "confirmed" and reference:
            # Update payment and order status
            # This would typically be done in a background task
            pass
        
        return {"status": "processed"}