import logging
from typing import Optional

import httpx

logger = logging.getLogger(__name__)

META_GRAPH_VERSION = "v18.0"
META_GRAPH_BASE = f"https://graph.facebook.com/{META_GRAPH_VERSION}"


class MetaAdapter:
    """Adapter for Meta Platform API (Instagram Graph API).

    Requires:
      - access_token: long-lived Page or Instagram access token
      - instagram_account_id: Instagram Business Account ID
    """

    def __init__(self, access_token: str, instagram_account_id: str):
        self.access_token = access_token
        self.instagram_account_id = instagram_account_id

    async def post_to_feed(self, image_url: str, caption: str) -> Optional[str]:
        """Upload image and publish to Instagram feed.

        Returns the post ID on success, raises on failure.
        """
        async with httpx.AsyncClient(timeout=30.0) as client:
            # Step 1: create media container
            resp = await client.post(
                f"{META_GRAPH_BASE}/{self.instagram_account_id}/media",
                data={
                    "image_url": image_url,
                    "caption": caption,
                    "access_token": self.access_token,
                },
            )
            resp.raise_for_status()
            creation_id = resp.json().get("id")
            if not creation_id:
                raise ValueError(f"No creation_id from Meta API: {resp.text}")

            # Step 2: publish
            resp2 = await client.post(
                f"{META_GRAPH_BASE}/{self.instagram_account_id}/media_publish",
                data={
                    "creation_id": creation_id,
                    "access_token": self.access_token,
                },
            )
            resp2.raise_for_status()
            post_id = resp2.json().get("id")
            logger.info(f"Published to Instagram feed: {post_id}")
            return post_id

    async def post_to_story(self, image_url: str) -> Optional[str]:
        """Upload image and publish to Instagram story.

        Returns the story ID on success, raises on failure.
        """
        async with httpx.AsyncClient(timeout=30.0) as client:
            # Step 1: create story container
            resp = await client.post(
                f"{META_GRAPH_BASE}/{self.instagram_account_id}/media",
                data={
                    "image_url": image_url,
                    "media_type": "STORIES",
                    "access_token": self.access_token,
                },
            )
            resp.raise_for_status()
            creation_id = resp.json().get("id")
            if not creation_id:
                raise ValueError(f"No creation_id from Meta API: {resp.text}")

            # Step 2: publish
            resp2 = await client.post(
                f"{META_GRAPH_BASE}/{self.instagram_account_id}/media_publish",
                data={
                    "creation_id": creation_id,
                    "access_token": self.access_token,
                },
            )
            resp2.raise_for_status()
            story_id = resp2.json().get("id")
            logger.info(f"Published to Instagram story: {story_id}")
            return story_id