"""FastAPI application that exposes the scan API and serves the front-end."""
from __future__ import annotations

import os
from pathlib import Path

from fastapi import FastAPI
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles

from network_mapper.scanner import NetworkScanner

BASE_DIR = Path(__file__).resolve().parent.parent
FRONTEND_DIR = BASE_DIR / "frontend"

app = FastAPI(title="LAN Graph Explorer")

scanner = NetworkScanner(
    ssh_user=os.environ.get("SSH_USER"),
    ssh_key_path=os.environ.get("SSH_KEY_PATH"),
)

app.mount("/static", StaticFiles(directory=FRONTEND_DIR), name="static")


@app.get("/api/scan")
async def api_scan(cidr: str | None = None, concurrency: int = 64, ssh_timeout: float = 5.0):
    """Run a fresh scan and return the topology graph."""
    result = await scanner.scan(cidr=cidr, concurrency=concurrency, ssh_timeout=ssh_timeout)
    return result.to_dict()


@app.get("/")
async def serve_frontend():
    return FileResponse(FRONTEND_DIR / "index.html")