from typing import Dict, Optional, List
from fastapi import WebSocket
from datetime import datetime

from app.core.mesh import MeshRegistry, MeshNode, MeshNodeStatus
from app.core.models import NodeType, WorkerRuntimeType

_mac_node_sockets: Dict[str, WebSocket] = {}
_mac_node_meta: Dict[str, dict] = {}


async def connect_mac_node(node_id: str, websocket: WebSocket) -> bool:
    _mac_node_sockets[node_id] = websocket
    _mac_node_meta[node_id] = {"capabilities": [], "connected_at": datetime.utcnow(), "last_heartbeat": datetime.utcnow()}
    # Register in mesh registry
    MeshRegistry.register_node(
        MeshNode(
            node_id=node_id,
            node_type=NodeType.MAC_AGENT,
            runtime_type=WorkerRuntimeType.OLLAMA,
            capabilities=[],
            status=MeshNodeStatus.ONLINE,
            supported_models=["llama3.2", "mistral"],
        )
    )
    return True


async def disconnect_mac_node(node_id: str) -> None:
    _mac_node_sockets.pop(node_id, None)
    _mac_node_meta.pop(node_id, None)
    node = MeshRegistry.get_node(node_id)
    if node:
        node.status = MeshNodeStatus.OFFLINE


async def send_to_mac_node(node_id: str, message: dict) -> bool:
    ws = _mac_node_sockets.get(node_id)
    if ws:
        try:
            await ws.send_json(message)
            return True
        except Exception:
            return False
    return False


def list_mac_nodes() -> list:
    return list(_mac_node_sockets.keys())


def get_mac_nodes_with_capability(capability: str) -> List[str]:
    return [nid for nid, meta in _mac_node_meta.items() if capability in meta.get("capabilities", [])]


def update_mac_capabilities(node_id: str, capabilities: List[str]) -> None:
    if node_id in _mac_node_meta:
        _mac_node_meta[node_id]["capabilities"] = capabilities


def update_mac_heartbeat(node_id: str) -> None:
    if node_id in _mac_node_meta:
        _mac_node_meta[node_id]["last_heartbeat"] = datetime.utcnow()


async def handle_mac_message(node_id: str, message: dict) -> None:
    op = message.get("op")
    if op == "node.register":
        await send_to_mac_node(node_id, {"op": "node.registered", "node_id": node_id})
    elif op == "node.capabilities":
        caps = message.get("capabilities", [])
        update_mac_capabilities(node_id, caps)
        await send_to_mac_node(node_id, {"op": "node.capabilities_ok", "count": len(caps)})
    elif op == "node.heartbeat":
        update_mac_heartbeat(node_id)
    elif op == "disconnect":
        await disconnect_mac_node(node_id)