import logging
from functools import wraps

from nio import AsyncClient, RoomMessageText, UnknownEvent

from config import BOT_PREFIX, MATRIX_USER_ID
from commands import COMMANDS, metrics
from welcome import handle_welcome_reaction, handle_space_join, SPACE_ROOM_ID

logger = logging.getLogger("matrixbot")


def handle_command_errors(func):
    @wraps(func)
    async def wrapper(client, room_id, sender, args):
        try:
            return await func(client, room_id, sender, args)
        except Exception as e:
            logger.error(f"Error in command {func.__name__}: {e}", exc_info=True)
            metrics.record_error(func.__name__)
            try:
                from utils import send_text
                await send_text(client, room_id, "An unexpected error occurred. Please try again later.")
            except Exception as e2:
                logger.error(f"Failed to send error message: {e2}", exc_info=True)
    return wrapper


class Callbacks:
    def __init__(self, client: AsyncClient):
        self.client = client
        # Track the sync token so we ignore old messages on startup
        self.startup_sync_token = None

    async def message(self, room, event):
        # Ignore messages from before the bot started
        if self.startup_sync_token is None:
            return

        # Ignore our own messages
        if event.sender == MATRIX_USER_ID:
            return

        body = event.body.strip() if event.body else ""
        if not body.startswith(BOT_PREFIX):
            return

        # Parse command and args
        without_prefix = body[len(BOT_PREFIX):]
        parts = without_prefix.split(None, 1)
        cmd_name = parts[0].lower() if parts else ""
        args = parts[1] if len(parts) > 1 else ""

        logger.info(f"Command '{cmd_name}' from {event.sender} in {room.room_id}")

        handler_entry = COMMANDS.get(cmd_name)
        if handler_entry is None:
            return

        handler, _ = handler_entry
        metrics.record_command(cmd_name)
        wrapped = handle_command_errors(handler)
        await wrapped(self.client, room.room_id, event.sender, args)

    async def reaction(self, room, event):
        """Handle m.reaction events (sent as UnknownEvent by matrix-nio)."""
        # Ignore events from before startup
        if self.startup_sync_token is None:
            return

        # Ignore our own reactions
        if event.sender == MATRIX_USER_ID:
            return

        # m.reaction events come as UnknownEvent with type "m.reaction"
        if not hasattr(event, "source"):
            return

        content = event.source.get("content", {})
        relates_to = content.get("m.relates_to", {})
        if relates_to.get("rel_type") != "m.annotation":
            return

        reacted_event_id = relates_to.get("event_id", "")
        key = relates_to.get("key", "")

        await handle_welcome_reaction(
            self.client, room.room_id, event.sender, reacted_event_id, key
        )

    async def member(self, room, event):
        """Handle m.room.member events — watch for Space joins."""
        # Ignore events from before startup
        if self.startup_sync_token is None:
            return

        # Only care about the Space
        if room.room_id != SPACE_ROOM_ID:
            return

        # Ignore our own membership changes
        if event.state_key == MATRIX_USER_ID:
            return

        # Only trigger on joins (not leaves, bans, etc.)
        if event.membership != "join":
            return

        # Check if this is a new join (prev was not "join")
        prev = event.prev_membership if hasattr(event, "prev_membership") else None
        if prev == "join":
            return  # Already was a member, this is a profile update or similar

        await handle_space_join(self.client, event.state_key)