"""Meta Graph API connector (Facebook Page + Instagram Business)."""

import logging

import requests
from django.conf import settings

from social.crypto import decrypt_tokens
import json

logger = logging.getLogger(__name__)


class MetaConnector:
    platform = "meta"
    GRAPH = "https://graph.facebook.com/v21.0"

    def publish(self, post, target) -> str:
        tokens = json.loads(decrypt_tokens(target.account.encrypted_tokens) or "{}")
        access_token = tokens.get("access_token")
        page_id = target.account.external_id or tokens.get("page_id")
        if not access_token or not page_id:
            raise RuntimeError("Meta account missing access_token/page_id")

        if target.platform == "instagram":
            # IG content publishing is a multi-step Graph flow; stub container create.
            raise NotImplementedError(
                "Instagram publish requires IG business account wiring — complete OAuth first"
            )

        response = requests.post(
            f"{self.GRAPH}/{page_id}/feed",
            data={"message": post.body, "access_token": access_token},
            timeout=30,
        )
        response.raise_for_status()
        return str(response.json().get("id") or "")

    def refresh_token(self, account) -> None:
        # Long-lived token exchange when META_APP_ID/SECRET are set.
        if not settings.META_APP_ID or not settings.META_APP_SECRET:
            return
        logger.info("Meta token refresh not yet implemented for account %s", account.pk)