twblue/src/sessions/atprotosocial/streaming.py

from __future__ import annotations

import asyncio
import logging
from typing import TYPE_CHECKING, Any, Callable, Coroutine

if TYPE_CHECKING:
    fromapprove.sessions.atprotosocial.session import Session as ATProtoSocialSession

logger = logging.getLogger(__name__)

# ATProtoSocial (Bluesky) uses a Firehose model for streaming.
# This typically involves connecting to a WebSocket endpoint and receiving events.
# The atproto SDK provides tools for this.


class ATProtoSocialStreaming:
    def __init__(self, session: ATProtoSocialSession, stream_type: str, params: dict[str, Any] | None = None) -> None:
        self.session = session
        self.stream_type = stream_type  # e.g., 'user', 'public', 'hashtag' - will need mapping to Firehose concepts
        self.params = params or {}
        self._handler: Callable[[dict[str, Any]], Coroutine[Any, Any, None]] | None = None
        self._connection_task: asyncio.Task[None] | None = None
        self._should_stop = False
        # self._client = None # This would be an instance of atproto.firehose.FirehoseSubscribeReposClient or similar

        # TODO: Map stream_type and params to ATProto Firehose subscription needs.
        # For example, 'user' might mean subscribing to mentions, replies, follows for the logged-in user.
        # This would likely involve filtering the general repo firehose for relevant events,
        # or using a more specific subscription if available for user-level events.

    async def _connect(self) -> None:
        """Internal method to connect to the ATProtoSocial Firehose."""
        # from atproto import AsyncClient
        # from atproto.firehose import FirehoseSubscribeReposClient, parse_subscribe_repos_message
        # from atproto.xrpc_client.models import get_or_create, ids, models

        logger.info(f"ATProtoSocial streaming: Connecting to Firehose for user {self.session.user_id}, stream type {self.stream_type}")
        self._should_stop = False

        try:
            # TODO: Replace with actual atproto SDK usage
            # client = self.session.util.get_client() # Get authenticated client from session utils
            # if not client or not client.me: # Check if client is authenticated
            #    logger.error("ATProtoSocial client not authenticated. Cannot start Firehose.")
            #    return

            # self._firehose_client = FirehoseSubscribeReposClient(params=None, base_uri=self.session.api_base_url) # Adjust base_uri if needed

            # async def on_message_handler(message: models.ComAtprotoSyncSubscribeRepos.Message) -> None:
            #     if self._should_stop:
            #         await self._firehose_client.stop() # Ensure client stops if flag is set
            #         return

            #     # This is a simplified example. Real implementation needs to:
            #     # 1. Determine the type of message (commit, handle, info, migrate, tombstone)
            #     # 2. For commits, unpack operations to find posts, likes, reposts, follows, etc.
            #     # 3. Filter these events to be relevant to the user (e.g., mentions, replies to user, new posts from followed users)
            #     # 4. Format the data into a structure that self._handle_event expects.
            #     # This filtering can be complex.

            #     # Example: if it's a commit and contains a new post that mentions the user
            #     # if isinstance(message, models.ComAtprotoSyncSubscribeRepos.Commit):
            #     #     # This part is highly complex due to CAR CIBOR decoding
            #     #     # Operations need to be extracted from the commit block
            #     #     # For each op, check if it's a create, and if the record is a post
            #     #     # Then, check if the post's text or facets mention the current user.
            #     #     # This is a placeholder for that logic.
            #     #     logger.debug(f"Firehose commit from {message.repo} at {message.time}")
            #     #     # Example of processing ops (pseudo-code, actual decoding is more involved):
            #     #     # ops = message.ops
            #     #     # for op in ops:
            #     #     #   if op.action == 'create' and op.path.endswith('/app.bsky.feed.post/...'):
            #     #     #       record_data = ... # decode op.cid from message.blocks
            #     #     #       if self.session.util.is_mention_of_me(record_data):
            #     #     #            event_data = self.session.util.format_post_event(record_data)
            #     #     #            await self._handle_event("mention", event_data)

            #     # For now, we'll just log that a message was received
            #     logger.debug(f"ATProtoSocial Firehose message received: {message.__class__.__name__}")


            # await self._firehose_client.start(on_message_handler)

            # Placeholder loop to simulate receiving events
            while not self._should_stop:
                await asyncio.sleep(1)
                # In a real implementation, this loop wouldn't exist; it'd be driven by the SDK's event handler.
                # To simulate an event:
                # if self._handler:
                #    mock_event = {"type": "placeholder_event", "data": {"text": "Hello from mock stream"}}
                #    await self._handler(mock_event) # Call the registered handler

            logger.info(f"ATProtoSocial streaming: Placeholder loop for {self.session.user_id} stopped.")


        except asyncio.CancelledError:
            logger.info(f"ATProtoSocial streaming task for user {self.session.user_id} was cancelled.")
        except Exception as e:
            logger.error(f"ATProtoSocial streaming error for user {self.session.user_id}: {e}", exc_info=True)
            # Optional: implement retry logic here or in the start_streaming method
            if not self._should_stop:
                await asyncio.sleep(30) # Wait before trying to reconnect (if auto-reconnect is desired)
                if not self._should_stop: # Check again before restarting
                     self._connection_task = asyncio.create_task(self._connect())


        finally:
            # if self._firehose_client:
            #    await self._firehose_client.stop()
            logger.info(f"ATProtoSocial streaming connection closed for user {self.session.user_id}.")


    async def _handle_event(self, event_type: str, data: dict[str, Any]) -> None:
        """
        Internal method to process an event from the stream and pass it to the session's handler.
        """
        if self._handler:
            try:
                # The data should be transformed into a common format expected by session.handle_streaming_event
                # This is where ATProtoSocial-specific event data is mapped to Approve's internal event structure.
                # For example, an ATProtoSocial 'mention' event needs to be structured similarly to
                # how a Mastodon 'mention' event would be.
                await self.session.handle_streaming_event(event_type, data)
            except Exception as e:
                logger.error(f"Error handling ATProtoSocial streaming event type {event_type}: {e}", exc_info=True)
        else:
            logger.warning(f"ATProtoSocial streaming: No handler registered for session {self.session.user_id}, event: {event_type}")


    def start_streaming(self, handler: Callable[[dict[str, Any]], Coroutine[Any, Any, None]]) -> None:
        """Starts the streaming connection."""
        if self._connection_task and not self._connection_task.done():
            logger.warning(f"ATProtoSocial streaming already active for user {self.session.user_id}.")
            return

        self._handler = handler # This handler is what session.py's handle_streaming_event calls
        self._should_stop = False
        logger.info(f"ATProtoSocial streaming: Starting for user {self.session.user_id}, type: {self.stream_type}")
        self._connection_task = asyncio.create_task(self._connect())


    async def stop_streaming(self) -> None:
        """Stops the streaming connection."""
        logger.info(f"ATProtoSocial streaming: Stopping for user {self.session.user_id}")
        self._should_stop = True
        # if self._firehose_client: # Assuming the SDK has a stop method
        #     await self._firehose_client.stop()

        if self._connection_task:
            if not self._connection_task.done():
                self._connection_task.cancel()
            try:
                await self._connection_task
            except asyncio.CancelledError:
                logger.info(f"ATProtoSocial streaming task successfully cancelled for {self.session.user_id}.")
            self._connection_task = None
        self._handler = None
        logger.info(f"ATProtoSocial streaming stopped for user {self.session.user_id}.")

    def is_alive(self) -> bool:
        """Checks if the streaming connection is currently active."""
        # return self._connection_task is not None and not self._connection_task.done() and self._firehose_client and self._firehose_client.is_connected
        return self._connection_task is not None and not self._connection_task.done() # Simplified check

    def get_stream_type(self) -> str:
        return self.stream_type

    def get_params(self) -> dict[str, Any]:
        return self.params

    # TODO: Add methods specific to ATProtoSocial streaming if necessary,
    # e.g., methods to modify subscription details on the fly if the API supports it.
    # For Bluesky Firehose, this might not be applicable as you usually connect and filter client-side.
    # However, if there were different Firehose endpoints (e.g., one for public posts, one for user-specific events),
    # this class might manage multiple connections or re-establish with new parameters.

    # Example of how events might be processed (highly simplified):
    # This would be called by the on_message_handler in _connect
    # async def _process_firehose_message(self, message: models.ComAtprotoSyncSubscribeRepos.Message):
    #     if isinstance(message, models.ComAtprotoSyncSubscribeRepos.Commit):
    #         # Decode CAR file in message.blocks to get ops
    #         # For each op (create, update, delete of a record):
    #         #   record = get_record_from_blocks(message.blocks, op.cid)
    #         #   if op.path.startswith("app.bsky.feed.post"): # It's a post
    #         #       # Check if it's a new post, a reply, a quote, etc.
    #         #       # Check for mentions of the current user
    #         #       # Example:
    #         #       if self.session.util.is_mention_of_me(record):
    #         #            formatted_event = self.session.util.format_post_as_notification(record, "mention")
    #         #            await self._handle_event("mention", formatted_event)
    #         #   elif op.path.startswith("app.bsky.graph.follow"):
    #         #       # Check if it's a follow of the current user
    #         #       if record.subject == self.session.util.get_my_did(): # Assuming get_my_did() exists
    #         #            formatted_event = self.session.util.format_follow_as_notification(record)
    #         #            await self._handle_event("follow", formatted_event)
    #         #   # Handle likes (app.bsky.feed.like), reposts (app.bsky.feed.repost), etc.
    #         pass
    #     elif isinstance(message, models.ComAtprotoSyncSubscribeRepos.Handle):
    #         # Handle DID to handle mapping updates if necessary
    #         logger.debug(f"Handle update: {message.handle} now points to {message.did} at {message.time}")
    #     elif isinstance(message, models.ComAtprotoSyncSubscribeRepos.Migrate):
    #         logger.info(f"Repo migration: {message.did} migrating from {message.migrateTo} at {message.time}")
    #     elif isinstance(message, models.ComAtprotoSyncSubscribeRepos.Tombstone):
    #         logger.info(f"Repo tombstone: {message.did} at {message.time}")
    #     elif isinstance(message, models.ComAtprotoSyncSubscribeRepos.Info):
    #         logger.info(f"Firehose info: {message.name} - {message.message}")
    #     else:
    #         logger.debug(f"Unknown Firehose message type: {message.__class__.__name__}")