# jarvis_mcp/client.py
import asyncio
from mcp import ClientSession
from mcp.client.streamable_http import streamablehttp_client
from util.logger import get_logger

logger = get_logger("MCP")


class MCPClient:
    def __init__(self, url: str):
        # Sauberes URL-Handling
        self.url = url.rstrip('/')
        if not self.url.endswith('/mcp'):
            self.url += '/mcp'
        
        self.session = None
        self._client_context = None

    async def connect(self):
        if self.session is not None:
            return

        logger.info(f"Verbinde mit OpenHAB MCP Server: {self.url}")

        try:
            self._client_context = streamablehttp_client(
                self.url,
                terminate_on_close=True
            )

            streams = await self._client_context.__aenter__()

            # Flexibles Unpacking
            if isinstance(streams, tuple):
                read, write = streams[:2]   # nimm nur die ersten zwei
            else:
                raise ValueError("Unerwartetes Response-Format vom Client")

            self.session = ClientSession(read, write)
            await asyncio.wait_for(self.session.initialize(), timeout=12.0)

            logger.info("✅ OpenHAB MCP Verbindung erfolgreich hergestellt!")

        except asyncio.TimeoutError:
            logger.error("❌ Timeout - MCP Server antwortet nicht rechtzeitig")
            raise
        except Exception as e:
            logger.error(f"❌ MCP Verbindungsfehler: {e}")
            raise

    async def list_tools(self):
        await self.connect()
        return await self.session.list_tools()

    async def call_tool(self, name: str, arguments: dict):
        await self.connect()
        return await self.session.call_tool(name, arguments)

    async def close(self):
        for obj in [self.session, self._client_context]:
            if obj:
                try:
                    if hasattr(obj, "close"):
                        await obj.close()
                    elif hasattr(obj, "__aexit__"):
                        await obj.__aexit__(None, None, None)
                except Exception as e:
                    logger.warning(f"Close Warning: {e}")
        
        self.session = None
        self._client_context = None