"""
FastAPI application entry point.
"""

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

from app.config import settings
from app.core.http_metrics import HTTPMetricsMiddleware

# Create FastAPI app
app = FastAPI(
    title=settings.PROJECT_NAME,
    version="0.1.0",
    description="MyBeacon Backend API - Modular BLE/WiFi monitoring platform",
    docs_url="/docs",
    redoc_url="/redoc",
)

# Configure CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.cors_origins_list,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Add HTTP metrics middleware
app.add_middleware(HTTPMetricsMiddleware)


@app.get("/")
async def root():
    """Root endpoint - API info."""
    return {
        "name": settings.PROJECT_NAME,
        "version": "0.1.0",
        "status": "running",
    }


@app.get("/health")
async def health_check():
    """Health check endpoint."""
    return {"status": "healthy"}


# Include routers
from app.api.v1 import router as api_v1_router

app.include_router(api_v1_router, prefix=settings.API_V1_PREFIX)


# Background task for tunnel watchdog with DB updates
async def tunnel_watchdog_with_db():
    """
    Tunnel watchdog: cleanup orphaned ttyd and stale sessions
    Runs independently of in-memory state and survives restarts
    """
    import asyncio
    from app.services.tunnel_service import tunnel_service
    from app.core.database import async_session_maker
    from app.models.device import Device
    from sqlalchemy import select
    from sqlalchemy.orm import attributes

    while True:
        await asyncio.sleep(60)  # Every minute

        # Run watchdog and get list of tunnels to disable
        tunnels_to_disable = await tunnel_service.watchdog_cleanup()

        if tunnels_to_disable:
            print(f"[watchdog] Disabling {len(tunnels_to_disable)} tunnels in device config")

            async with async_session_maker() as db:
                for device_mac, tunnel_type in tunnels_to_disable:
                    # Find device by MAC address
                    result = await db.execute(
                        select(Device).where(Device.mac_address == device_mac)
                    )
                    device = result.scalar_one_or_none()

                    if device and device.config:
                        tunnel_key = f"{tunnel_type}_tunnel"
                        if tunnel_key in device.config:
                            # Disable tunnel
                            device.config[tunnel_key]["enabled"] = False
                            attributes.flag_modified(device, "config")
                            print(f"[watchdog] Disabled {tunnel_type} tunnel for {device_mac}")

                await db.commit()


# Startup event
@app.on_event("startup")
async def startup_event():
    """Initialize services on startup"""
    # Start tunnel watchdog background task
    import asyncio
    asyncio.create_task(tunnel_watchdog_with_db())
    print("[startup] Tunnel watchdog started (checks every 60s)")

    # Start host monitoring background task
    from app.services.host_monitor import host_monitor
    asyncio.create_task(host_monitor.run_monitoring_loop())
    print("[startup] Host monitoring task started")


# Shutdown event
@app.on_event("shutdown")
async def shutdown_event():
    """Cleanup on shutdown"""
    from app.services.host_monitor import host_monitor
    await host_monitor.stop()
    print("[shutdown] Host monitoring stopped")