"""Router main module - FastAPI app factory.

Creates the FastAPI application with:
- Feishu WebSocket client
- Node WebSocket endpoint
- Health check endpoints
"""

from __future__ import annotations

import logging
from typing import Optional

from fastapi import FastAPI, WebSocket
from fastapi.middleware.cors import CORSMiddleware

from bot.handler import start_websocket_client
from router.nodes import NodeRegistry, get_node_registry
from router.ws import ws_node_endpoint

logger = logging.getLogger(__name__)


def create_app(router_secret: Optional[str] = None) -> FastAPI:
    """Create the FastAPI application.

    Args:
        router_secret: Secret for authenticating host client connections
    """
    app = FastAPI(title="PhoneWork Router", version="3.0.0")

    app.add_middleware(
        CORSMiddleware,
        allow_origins=["*"],
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    registry = get_node_registry()
    if router_secret:
        registry._secret = router_secret

    @app.get("/health")
    async def health():
        nodes = registry.list_nodes()
        online_nodes = [n for n in nodes if n["status"] == "online"]
        return {
            "status": "ok",
            "nodes": nodes,
            "online_nodes": len(online_nodes),
            "total_nodes": len(nodes),
            "pending_requests": 0,
        }

    @app.get("/nodes")
    async def list_nodes():
        return registry.list_nodes()

    @app.websocket("/ws/node")
    async def ws_node(websocket: WebSocket):
        await ws_node_endpoint(websocket)

    @app.on_event("startup")
    async def startup():
        import asyncio
        loop = asyncio.get_event_loop()
        start_websocket_client(loop)
        logger.info("Router started")

    @app.on_event("shutdown")
    async def shutdown():
        logger.info("Router shut down")

    return app