"""Command line entrypoints for the LAN visualizer."""
from __future__ import annotations

import asyncio
import json
from pathlib import Path

import typer

from network_mapper.scanner import NetworkScanner

app = typer.Typer(help="LAN discovery + visualization tooling")


@app.command()
def scan(
    cidr: str | None = typer.Option(
        None,
        help="CIDR range to probe (defaults to the primary IPv4 network).",
    ),
    concurrency: int = typer.Option(32, help="Limit the number of simultaneous pings."),
    ssh_timeout: float = typer.Option(5.0, help="Seconds to wait for SSH probes."),
    ssh_user: str | None = typer.Option(
        None,
        envvar="SSH_USER",
        help="Username for SSH probes when key auth is available.",
    ),
    ssh_key: Path | None = typer.Option(
        None,
        envvar="SSH_KEY_PATH",
        exists=True,
        file_okay=True,
        dir_okay=False,
        help="Private key path for passwordless SSH execution.",
    ),
    output: Path | None = typer.Option(
        None,
        exists=False,
        file_okay=True,
        dir_okay=False,
        help="Write the scan result JSON to this file instead of stdout.",
    ),
):
    """Run a single scan and emit JSON results."""
    scanner = NetworkScanner(ssh_user=ssh_user, ssh_key_path=str(ssh_key) if ssh_key else None)
    result = asyncio.run(scanner.scan(cidr=cidr, concurrency=concurrency, ssh_timeout=ssh_timeout))
    payload = result.to_dict()
    serialized = json.dumps(payload, indent=2)
    if output:
        output.write_text(serialized)
        typer.echo(f"Scan saved to {output}")
    else:
        typer.echo(serialized)


@app.command()
def serve(host: str = "0.0.0.0", port: int = 8000, reload: bool = False):
    """Start the FastAPI server and front-end."""
    import uvicorn

    uvicorn.run("network_mapper.main:app", host=host, port=port, reload=reload)