import logging
from typing import Any, Dict, Optional
import httpx

from core.communication.adapters.base import PlatformAdapter

logger = logging.getLogger(__name__)

class GoogleChatAdapter(PlatformAdapter):
    """
    Adapter for Google Chat.
    
    Handlers Webhooks:
    - Receive message events from Google Chat.
    
    Outbound:
    - Post messages to Google Chat spaces.
    """
    
    def __init__(self):
        # We assume standard environment variables or service account for auth
        pass

    def verify_request(self, headers: Dict, body: str) -> bool:
        """
        Verify Google Chat token. 
        Google Chat uses Bearer tokens in the Authorization header for verification.
        """
        # For MVP, we'll implement a stub or assume verification at the ingress layer.
        return True

    def normalize_payload(self, payload: Dict) -> Optional[Dict[str, Any]]:
        """
        Normalize Google Chat message payload.
        
        {
          "type": "MESSAGE",
          "eventTime": "...",
          "space": { "name": "spaces/...", "type": "ROOM" },
          "message": {
            "name": "spaces/.../messages/...",
            "sender": { "name": "users/...", "displayName": "User Name", "email": "user@example.com" },
            "text": "Hello world"
          },
          "user": { "name": "users/...", "displayName": "User Name" }
        }
        """
        if payload.get("type") != "MESSAGE":
            return None
            
        message = payload.get("message", {})
        sender = message.get("sender", {})
        space = payload.get("space", {})
        
        sender_id = sender.get("email") or sender.get("name")
        content = message.get("text", "")
        space_name = space.get("name")
        
        if not sender_id or not content or not space_name:
            return None
            
        return {
            "source": "google_chat",
            "source_id": space_name,
            "channel_id": space_name,
            "sender_id": sender_id,
            "content": content,
            "metadata": {
                "display_name": sender.get("displayName"),
                "space_type": space.get("type")
            }
        }

    async def send_message(self, target_id: str, message: str) -> bool:
        """
        Send a message to a Google Chat space.
        target_id: The space name (e.g., spaces/AAAABBBB).
        """
        # Google Chat API usually requires OAuth2 or Service Account.
        # This implementation assumes we utilize a simpler webhook approach if target_id is a URL, 
        # or we use the Google API client if it's a space name.
        
        # In a real implementation we would use:
        # from google.oauth2 import service_account
        # from googleapiclient.discovery import build
        
        # For this adapter, we will use httpx to call a presumed App/Service endpoint.
        url = f"https://chat.googleapis.com/v1/{target_id}/messages"
        
        headers = {
            "Content-Type": "application/json; charset=UTF-8"
        }
        
        payload = {
            "text": message
        }
        
        # Note: Auth token should be injected here.
        # For now, we log the intent.
        
        async with httpx.AsyncClient() as client:
            try:
                # In a real scenario, we'd add .auth=google_auth
                # For simulation, we assume success if target_id is valid.
                logger.info(f"Google Chat: Sending message to {target_id}")
                return True
            except Exception as e:
                logger.error(f"Failed to send Google Chat message: {e}")
                return False