import { useState, useEffect, useMemo } from 'react';
import { MapPinned } from 'lucide-react';
import { Input } from '../ui/input';
import { Label } from '../ui/label';
import { Button } from '../ui/button';
import { Separator } from '../ui/separator';
import { toast } from '../ui/sonner';
import { Checkbox } from '../ui/checkbox';
import { RADIO_PRESETS } from '../../utils/radioPresets';
import { stripRegionScopePrefix } from '../../utils/regionScope';
import type {
  AppSettings,
  AppSettingsUpdate,
  HealthStatus,
  RadioAdvertMode,
  RadioConfig,
  RadioConfigUpdate,
  RadioDiscoveryResponse,
  RadioDiscoveryTarget,
} from '../../types';

export function SettingsRadioSection({
  config,
  health,
  appSettings,
  pageMode,
  onSave,
  onSaveAppSettings,
  onSetPrivateKey,
  onReboot,
  onDisconnect,
  onReconnect,
  onAdvertise,
  meshDiscovery,
  meshDiscoveryLoadingTarget,
  onDiscoverMesh,
  onClose,
  className,
}: {
  config: RadioConfig;
  health: HealthStatus | null;
  appSettings: AppSettings;
  pageMode: boolean;
  onSave: (update: RadioConfigUpdate) => Promise<void>;
  onSaveAppSettings: (update: AppSettingsUpdate) => Promise<void>;
  onSetPrivateKey: (key: string) => Promise<void>;
  onReboot: () => Promise<void>;
  onDisconnect: () => Promise<void>;
  onReconnect: () => Promise<void>;
  onAdvertise: (mode: RadioAdvertMode) => Promise<void>;
  meshDiscovery: RadioDiscoveryResponse | null;
  meshDiscoveryLoadingTarget: RadioDiscoveryTarget | null;
  onDiscoverMesh: (target: RadioDiscoveryTarget) => Promise<void>;
  onClose: () => void;
  className?: string;
}) {
  // Radio config state
  const [name, setName] = useState('');
  const [lat, setLat] = useState('');
  const [lon, setLon] = useState('');
  const [txPower, setTxPower] = useState('');
  const [freq, setFreq] = useState('');
  const [bw, setBw] = useState('');
  const [sf, setSf] = useState('');
  const [cr, setCr] = useState('');
  const [pathHashMode, setPathHashMode] = useState('0');
  const [advertLocationSource, setAdvertLocationSource] = useState<'off' | 'current'>('current');
  const [multiAcksEnabled, setMultiAcksEnabled] = useState(false);
  const [gettingLocation, setGettingLocation] = useState(false);
  const [busy, setBusy] = useState(false);
  const [rebooting, setRebooting] = useState(false);
  const [error, setError] = useState<string | null>(null);

  // Identity state
  const [privateKey, setPrivateKey] = useState('');
  const [identityBusy, setIdentityBusy] = useState(false);
  const [identityRebooting, setIdentityRebooting] = useState(false);
  const [identityError, setIdentityError] = useState<string | null>(null);

  // Flood & advert control state
  const [advertIntervalHours, setAdvertIntervalHours] = useState('0');
  const [floodScope, setFloodScope] = useState('');
  const [maxRadioContacts, setMaxRadioContacts] = useState('');
  const [floodBusy, setFloodBusy] = useState(false);
  const [floodError, setFloodError] = useState<string | null>(null);

  // Advertise state
  const [advertisingMode, setAdvertisingMode] = useState<RadioAdvertMode | null>(null);
  const [discoverError, setDiscoverError] = useState<string | null>(null);
  const [connectionBusy, setConnectionBusy] = useState(false);

  useEffect(() => {
    setName(config.name);
    setLat(String(config.lat));
    setLon(String(config.lon));
    setTxPower(String(config.tx_power));
    setFreq(String(config.radio.freq));
    setBw(String(config.radio.bw));
    setSf(String(config.radio.sf));
    setCr(String(config.radio.cr));
    setPathHashMode(String(config.path_hash_mode));
    setAdvertLocationSource(config.advert_location_source ?? 'current');
    setMultiAcksEnabled(config.multi_acks_enabled ?? false);
  }, [config]);

  useEffect(() => {
    setAdvertIntervalHours(String(Math.round(appSettings.advert_interval / 3600)));
    setFloodScope(stripRegionScopePrefix(appSettings.flood_scope));
    setMaxRadioContacts(String(appSettings.max_radio_contacts));
  }, [appSettings]);

  const currentPreset = useMemo(() => {
    const freqNum = parseFloat(freq);
    const bwNum = parseFloat(bw);
    const sfNum = parseInt(sf, 10);
    const crNum = parseInt(cr, 10);

    for (const preset of RADIO_PRESETS) {
      if (
        preset.freq === freqNum &&
        preset.bw === bwNum &&
        preset.sf === sfNum &&
        preset.cr === crNum
      ) {
        return preset.name;
      }
    }
    return 'custom';
  }, [freq, bw, sf, cr]);

  const handlePresetChange = (presetName: string) => {
    if (presetName === 'custom') return;
    const preset = RADIO_PRESETS.find((p) => p.name === presetName);
    if (preset) {
      setFreq(String(preset.freq));
      setBw(String(preset.bw));
      setSf(String(preset.sf));
      setCr(String(preset.cr));
    }
  };

  const handleGetLocation = () => {
    if (!navigator.geolocation) {
      toast.error('Geolocation not supported', {
        description: 'Your browser does not support geolocation',
      });
      return;
    }

    setGettingLocation(true);
    navigator.geolocation.getCurrentPosition(
      (position) => {
        setLat(position.coords.latitude.toFixed(6));
        setLon(position.coords.longitude.toFixed(6));
        setGettingLocation(false);
        toast.success('Location updated');
      },
      (err) => {
        setGettingLocation(false);
        toast.error('Failed to get location', {
          description: err.message,
        });
      },
      { enableHighAccuracy: true, timeout: 10000 }
    );
  };

  const buildUpdate = (): RadioConfigUpdate | null => {
    const parsedLat = parseFloat(lat);
    const parsedLon = parseFloat(lon);
    const parsedTxPower = parseInt(txPower, 10);
    const parsedFreq = parseFloat(freq);
    const parsedBw = parseFloat(bw);
    const parsedSf = parseInt(sf, 10);
    const parsedCr = parseInt(cr, 10);

    if (
      [parsedLat, parsedLon, parsedTxPower, parsedFreq, parsedBw, parsedSf, parsedCr].some((v) =>
        isNaN(v)
      )
    ) {
      setError('All numeric fields must have valid values');
      return null;
    }

    const parsedPathHashMode = parseInt(pathHashMode, 10);

    return {
      name,
      lat: parsedLat,
      lon: parsedLon,
      tx_power: parsedTxPower,
      ...(advertLocationSource !== (config.advert_location_source ?? 'current')
        ? { advert_location_source: advertLocationSource }
        : {}),
      ...(multiAcksEnabled !== (config.multi_acks_enabled ?? false)
        ? { multi_acks_enabled: multiAcksEnabled }
        : {}),
      radio: {
        freq: parsedFreq,
        bw: parsedBw,
        sf: parsedSf,
        cr: parsedCr,
      },
      ...(config.path_hash_mode_supported &&
      !isNaN(parsedPathHashMode) &&
      parsedPathHashMode !== config.path_hash_mode
        ? { path_hash_mode: parsedPathHashMode }
        : {}),
    };
  };

  const handleSave = async () => {
    setError(null);
    const update = buildUpdate();
    if (!update) return;

    setBusy(true);
    try {
      await onSave(update);
      toast.success('Radio config saved');
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to save');
    } finally {
      setBusy(false);
    }
  };

  const handleSaveAndReboot = async () => {
    setError(null);
    const update = buildUpdate();
    if (!update) return;

    setBusy(true);
    try {
      await onSave(update);
      toast.success('Radio config saved, rebooting...');
      setRebooting(true);
      await onReboot();
      if (!pageMode) {
        onClose();
      }
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to save');
    } finally {
      setRebooting(false);
      setBusy(false);
    }
  };

  const handleSetPrivateKey = async () => {
    if (!privateKey.trim()) {
      setIdentityError('Private key is required');
      return;
    }
    setIdentityError(null);
    setIdentityBusy(true);

    try {
      await onSetPrivateKey(privateKey.trim());
      setPrivateKey('');
      toast.success('Private key set, rebooting...');
      setIdentityRebooting(true);
      await onReboot();
      if (!pageMode) {
        onClose();
      }
    } catch (err) {
      setIdentityError(err instanceof Error ? err.message : 'Failed to set private key');
    } finally {
      setIdentityRebooting(false);
      setIdentityBusy(false);
    }
  };

  const handleSaveFloodSettings = async () => {
    setFloodError(null);
    setFloodBusy(true);

    try {
      const update: AppSettingsUpdate = {};
      const hours = parseInt(advertIntervalHours, 10);
      const newAdvertInterval = isNaN(hours) ? 0 : hours * 3600;
      if (newAdvertInterval !== appSettings.advert_interval) {
        update.advert_interval = newAdvertInterval;
      }
      if (floodScope !== stripRegionScopePrefix(appSettings.flood_scope)) {
        update.flood_scope = floodScope;
      }
      const newMaxRadioContacts = parseInt(maxRadioContacts, 10);
      if (!isNaN(newMaxRadioContacts) && newMaxRadioContacts !== appSettings.max_radio_contacts) {
        update.max_radio_contacts = newMaxRadioContacts;
      }
      if (Object.keys(update).length > 0) {
        await onSaveAppSettings(update);
      }
      toast.success('Settings saved');
    } catch (err) {
      setFloodError(err instanceof Error ? err.message : 'Failed to save');
    } finally {
      setFloodBusy(false);
    }
  };

  const handleAdvertise = async (mode: RadioAdvertMode) => {
    setAdvertisingMode(mode);
    try {
      await onAdvertise(mode);
    } finally {
      setAdvertisingMode(null);
    }
  };

  const handleDiscover = async (target: RadioDiscoveryTarget) => {
    setDiscoverError(null);
    try {
      await onDiscoverMesh(target);
    } catch (err) {
      setDiscoverError(err instanceof Error ? err.message : 'Failed to run mesh discovery');
    }
  };

  const radioState =
    health?.radio_state ?? (health?.radio_initializing ? 'initializing' : 'disconnected');
  const connectionActionLabel =
    radioState === 'paused'
      ? 'Reconnect'
      : radioState === 'connected' || radioState === 'initializing'
        ? 'Disconnect'
        : 'Stop Trying';

  const connectionStatusLabel =
    radioState === 'connected'
      ? health?.connection_info || 'Connected'
      : radioState === 'initializing'
        ? `Initializing ${health?.connection_info || 'radio'}`
        : radioState === 'connecting'
          ? `Attempting to connect${health?.connection_info ? ` to ${health.connection_info}` : ''}`
          : radioState === 'paused'
            ? `Connection paused${health?.connection_info ? ` (${health.connection_info})` : ''}`
            : 'Not connected';

  const deviceInfoLabel = useMemo(() => {
    const info = health?.radio_device_info;
    if (!info) {
      return null;
    }

    const model = info.model?.trim() || null;
    const firmwareParts = [info.firmware_build?.trim(), info.firmware_version?.trim()].filter(
      (value): value is string => Boolean(value)
    );
    const capacityParts = [
      typeof info.max_contacts === 'number' ? `${info.max_contacts} contacts` : null,
      typeof info.max_channels === 'number' ? `${info.max_channels} channels` : null,
    ].filter((value): value is string => value !== null);

    if (!model && firmwareParts.length === 0 && capacityParts.length === 0) {
      return null;
    }

    let label = model ?? 'Radio';
    if (firmwareParts.length > 0) {
      label += ` running ${firmwareParts.join('/')}`;
    }
    if (capacityParts.length > 0) {
      label += ` (max: ${capacityParts.join(', ')})`;
    }
    return label;
  }, [health?.radio_device_info]);

  const handleConnectionAction = async () => {
    setConnectionBusy(true);
    try {
      if (radioState === 'paused') {
        await onReconnect();
        toast.success('Reconnect requested');
      } else {
        await onDisconnect();
        toast.success('Radio connection paused');
      }
    } catch (err) {
      toast.error('Failed to change radio connection state', {
        description: err instanceof Error ? err.message : 'Check radio connection and try again',
      });
    } finally {
      setConnectionBusy(false);
    }
  };

  return (
    <div className={className}>
      {/* ── Connection ── */}
      <div className="space-y-3">
        <Label className="text-base">Connection</Label>
        <div className="flex items-center gap-2">
          <div
            className={`w-2 h-2 rounded-full ${
              radioState === 'connected'
                ? 'bg-status-connected'
                : radioState === 'initializing' || radioState === 'connecting'
                  ? 'bg-warning'
                  : 'bg-status-disconnected'
            }`}
          />
          <span
            className={
              radioState === 'paused' || radioState === 'disconnected'
                ? 'text-muted-foreground'
                : ''
            }
          >
            {connectionStatusLabel}
          </span>
        </div>
        {deviceInfoLabel && <p className="text-sm text-muted-foreground">{deviceInfoLabel}</p>}
        <Button
          type="button"
          variant="outline"
          onClick={handleConnectionAction}
          disabled={connectionBusy}
          className="w-full"
        >
          {connectionBusy ? `${connectionActionLabel}...` : connectionActionLabel}
        </Button>
        <p className="text-xs text-muted-foreground">
          Disconnect pauses automatic reconnect attempts so another device can use the radio.
        </p>
      </div>

      <Separator />

      {/* ── Identity ── */}
      <div className="space-y-2">
        <Label className="text-base">Identity</Label>
      </div>

      <div className="space-y-2">
        <Label htmlFor="name">Radio Name</Label>
        <Input id="name" value={name} onChange={(e) => setName(e.target.value)} />
      </div>

      <div className="space-y-2">
        <Label htmlFor="public-key">Public Key</Label>
        <Input id="public-key" value={config.public_key} disabled className="font-mono text-xs" />
      </div>

      <div className="space-y-2">
        <Label htmlFor="private-key">Set Private Key (write-only)</Label>
        <Input
          id="private-key"
          type="password"
          autoComplete="off"
          value={privateKey}
          onChange={(e) => setPrivateKey(e.target.value)}
          placeholder="64-character hex private key"
        />
        <Button
          onClick={handleSetPrivateKey}
          disabled={identityBusy || identityRebooting || !privateKey.trim()}
          className="w-full border-destructive/50 text-destructive hover:bg-destructive/10"
          variant="outline"
        >
          {identityBusy || identityRebooting
            ? 'Setting & Rebooting...'
            : 'Set Private Key & Reboot'}
        </Button>
      </div>

      {identityError && (
        <div className="text-sm text-destructive" role="alert">
          {identityError}
        </div>
      )}

      <Separator />

      {/* ── Radio Parameters ── */}
      <div className="space-y-2">
        <Label className="text-base">Radio Parameters</Label>
      </div>

      <div className="space-y-2">
        <Label htmlFor="preset">Preset</Label>
        <select
          id="preset"
          value={currentPreset}
          onChange={(e) => handlePresetChange(e.target.value)}
          className="w-full h-10 px-3 rounded-md border border-input bg-background text-sm ring-offset-background focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2"
        >
          <option value="custom">Custom</option>
          {RADIO_PRESETS.map((preset) => (
            <option key={preset.name} value={preset.name}>
              {preset.name}
            </option>
          ))}
        </select>
      </div>

      <div className="grid grid-cols-2 gap-4">
        <div className="space-y-2">
          <Label htmlFor="freq">Frequency (MHz)</Label>
          <Input
            id="freq"
            type="number"
            step="any"
            value={freq}
            onChange={(e) => setFreq(e.target.value)}
          />
        </div>
        <div className="space-y-2">
          <Label htmlFor="bw">Bandwidth (kHz)</Label>
          <Input
            id="bw"
            type="number"
            step="any"
            value={bw}
            onChange={(e) => setBw(e.target.value)}
          />
        </div>
      </div>

      <div className="grid grid-cols-2 gap-4">
        <div className="space-y-2">
          <Label htmlFor="sf">Spreading Factor</Label>
          <Input
            id="sf"
            type="number"
            min="7"
            max="12"
            value={sf}
            onChange={(e) => setSf(e.target.value)}
          />
        </div>
        <div className="space-y-2">
          <Label htmlFor="cr">Coding Rate</Label>
          <Input
            id="cr"
            type="number"
            min="5"
            max="8"
            value={cr}
            onChange={(e) => setCr(e.target.value)}
          />
        </div>
      </div>

      <div className="grid grid-cols-2 gap-4">
        <div className="space-y-2">
          <Label htmlFor="tx-power">TX Power (dBm)</Label>
          <Input
            id="tx-power"
            type="number"
            value={txPower}
            onChange={(e) => setTxPower(e.target.value)}
          />
        </div>
        <div className="space-y-2">
          <Label htmlFor="max-tx">Max TX Power</Label>
          <Input id="max-tx" type="number" value={config.max_tx_power} disabled />
        </div>
      </div>

      {config.path_hash_mode_supported && (
        <div className="space-y-2">
          <Label htmlFor="path-hash-mode">Path Hash Mode</Label>
          <select
            id="path-hash-mode"
            value={pathHashMode}
            onChange={(e) => setPathHashMode(e.target.value)}
            className="w-full h-10 px-3 rounded-md border border-input bg-background text-sm ring-offset-background focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2"
          >
            <option value="0">1 byte (default)</option>
            <option value="1">2 bytes</option>
            <option value="2">3 bytes</option>
          </select>
          <div className="rounded-md border border-warning/50 bg-warning/10 p-3 text-xs text-warning">
            <p className="font-semibold mb-1">Compatibility Warning</p>
            <p>
              ALL nodes along a message&apos;s route &mdash; your radio, every repeater, and the
              recipient &mdash; must be running firmware that supports the selected mode. Messages
              sent with 2-byte or 3-byte hops will be dropped by any node on older firmware.
            </p>
          </div>
        </div>
      )}

      <Separator />

      {/* ── Location ── */}
      <div className="space-y-2">
        <div className="flex items-center justify-between">
          <Label className="text-base">Location</Label>
          <Button
            type="button"
            variant="outline"
            size="sm"
            onClick={handleGetLocation}
            disabled={gettingLocation}
          >
            {gettingLocation ? (
              'Getting...'
            ) : (
              <>
                <MapPinned className="mr-1.5 h-4 w-4" aria-hidden="true" />
                Use My Location
              </>
            )}
          </Button>
        </div>
        <div className="grid grid-cols-2 gap-4">
          <div className="space-y-2">
            <Label htmlFor="lat" className="text-xs text-muted-foreground">
              Latitude
            </Label>
            <Input
              id="lat"
              type="number"
              step="any"
              value={lat}
              onChange={(e) => setLat(e.target.value)}
            />
          </div>
          <div className="space-y-2">
            <Label htmlFor="lon" className="text-xs text-muted-foreground">
              Longitude
            </Label>
            <Input
              id="lon"
              type="number"
              step="any"
              value={lon}
              onChange={(e) => setLon(e.target.value)}
            />
          </div>
        </div>
        <div className="space-y-2">
          <Label htmlFor="advert-location-source">Advert Location Source</Label>
          <select
            id="advert-location-source"
            value={advertLocationSource}
            onChange={(e) => setAdvertLocationSource(e.target.value as 'off' | 'current')}
            className="w-full h-10 px-3 rounded-md border border-input bg-background text-sm ring-offset-background focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2"
          >
            <option value="off">Off</option>
            <option value="current">Include Node Location</option>
          </select>
          <p className="text-xs text-muted-foreground">
            Companion-radio firmware does not distinguish between saved coordinates and live GPS
            here. When enabled, adverts include the node&apos;s current location state. That may be
            the last coordinates you set from RemoteTerm or live GPS coordinates if the node itself
            is already updating them. RemoteTerm cannot enable GPS on the node through the interface
            library.
          </p>
        </div>
      </div>

      {error && (
        <div className="text-sm text-destructive" role="alert">
          {error}
        </div>
      )}

      <div className="flex gap-2">
        <Button
          onClick={handleSave}
          disabled={busy || rebooting}
          variant="outline"
          className="flex-1"
        >
          {busy && !rebooting ? 'Saving...' : 'Save'}
        </Button>
        <Button onClick={handleSaveAndReboot} disabled={busy || rebooting} className="flex-1">
          {rebooting ? 'Rebooting...' : 'Save & Reboot'}
        </Button>
      </div>
      <p className="text-xs text-muted-foreground">
        Some settings may require a reboot to take effect on some radios.
      </p>

      <Separator />

      {/* ── Messaging ── */}
      <div className="space-y-2">
        <Label className="text-base">Messaging</Label>
      </div>

      <div className="space-y-2">
        <div className="flex items-start gap-3 rounded-md border border-border/60 p-3">
          <Checkbox
            id="multi-acks-enabled"
            checked={multiAcksEnabled}
            onCheckedChange={(checked) => setMultiAcksEnabled(checked === true)}
            className="mt-0.5"
          />
          <div className="space-y-1">
            <Label htmlFor="multi-acks-enabled">Extra Direct ACK Transmission</Label>
            <p className="text-xs text-muted-foreground">
              When enabled, the radio sends one extra direct ACK transmission before the normal ACK
              for received direct messages. This is a firmware-level receive behavior, not a
              RemoteTerm retry setting.
            </p>
          </div>
        </div>

        <div className="flex items-start gap-3 rounded-md border border-border/60 p-3">
          <Checkbox
            id="auto-resend-channel"
            checked={appSettings.auto_resend_channel}
            onCheckedChange={(checked) =>
              onSaveAppSettings({ auto_resend_channel: checked === true })
            }
            className="mt-0.5"
          />
          <div className="space-y-1">
            <Label htmlFor="auto-resend-channel">Auto-Resend Unheard Channel Messages</Label>
            <p className="text-xs text-muted-foreground">
              When enabled, outgoing channel messages that receive no echo within 2 seconds are
              automatically resent once (byte-perfect, within the 30-second dedup window). Repeaters
              that already heard the original will ignore the duplicate. This functionality will NOT
              create double-sent/duplicate messages.
            </p>
          </div>
        </div>
      </div>

      <div className="space-y-2">
        <Label htmlFor="flood-scope">Flood Scope / Region</Label>
        <Input
          id="flood-scope"
          value={floodScope}
          onChange={(e) => setFloodScope(e.target.value)}
          placeholder="MyRegion"
        />
        <p className="text-xs text-muted-foreground">
          Tag outgoing flood messages with a region name (e.g. MyRegion). Repeaters configured for
          that region can forward the traffic, while repeaters configured to deny other regions may
          drop it. Leave empty to disable.
        </p>
      </div>

      <div className="space-y-2">
        <Label htmlFor="max-contacts">Max Contacts on Radio</Label>
        <Input
          id="max-contacts"
          type="number"
          min="1"
          max="1000"
          value={maxRadioContacts}
          onChange={(e) => setMaxRadioContacts(e.target.value)}
        />
        <p className="text-xs text-muted-foreground">
          Configured radio contact capacity. Favorites reload first, then background maintenance
          refills to about 80% of this value and offloads once occupancy reaches about 95%.
        </p>
        {health?.radio_device_info?.max_contacts != null &&
          Number(maxRadioContacts) > health.radio_device_info.max_contacts && (
            <p className="text-xs text-warning">
              Your radio reports a hardware limit of {health.radio_device_info.max_contacts}{' '}
              contacts. The effective cap will be limited to what the radio supports.
            </p>
          )}
      </div>

      {floodError && (
        <div className="text-sm text-destructive" role="alert">
          {floodError}
        </div>
      )}

      <Button onClick={handleSaveFloodSettings} disabled={floodBusy} className="w-full">
        {floodBusy ? 'Saving...' : 'Save Settings'}
      </Button>

      <Separator />

      {/* ── Advertising & Discovery ── */}
      <div className="space-y-2">
        <Label className="text-base">Advertising &amp; Discovery</Label>
      </div>

      <div className="space-y-2">
        <Label htmlFor="advert-interval">Periodic Advertising Interval</Label>
        <div className="flex items-center gap-2">
          <Input
            id="advert-interval"
            type="number"
            min="0"
            value={advertIntervalHours}
            onChange={(e) => setAdvertIntervalHours(e.target.value)}
            className="w-28"
          />
          <span className="text-sm text-muted-foreground">hours (0 = off)</span>
        </div>
        <p className="text-xs text-muted-foreground">
          How often to automatically advertise presence. Set to 0 to disable. Minimum: 1 hour.
          Recommended: 24 hours or higher.
        </p>
      </div>

      <div className="space-y-2">
        <Label>Send Advertisement</Label>
        <p className="text-xs text-muted-foreground">
          Flood adverts propagate through repeaters. Zero-hop adverts are local-only and use less
          airtime.
        </p>
        <div className="grid grid-cols-1 gap-2 sm:grid-cols-2">
          <Button
            onClick={() => handleAdvertise('flood')}
            disabled={advertisingMode !== null || !health?.radio_connected}
            className="w-full bg-warning hover:bg-warning/90 text-warning-foreground"
          >
            {advertisingMode === 'flood' ? 'Sending...' : 'Send Flood Advertisement'}
          </Button>
          <Button
            onClick={() => handleAdvertise('zero_hop')}
            disabled={advertisingMode !== null || !health?.radio_connected}
            className="w-full"
          >
            {advertisingMode === 'zero_hop' ? 'Sending...' : 'Send Zero-Hop Advertisement'}
          </Button>
        </div>
        {!health?.radio_connected && (
          <p className="text-sm text-destructive">Radio not connected</p>
        )}
      </div>

      <div className="space-y-3">
        <Label>Mesh Discovery</Label>
        <p className="text-xs text-muted-foreground">
          Discover nearby node types that currently respond to mesh discovery requests: repeaters
          and sensors.
        </p>
        <div className="grid grid-cols-1 gap-2 sm:grid-cols-3">
          {[
            { target: 'repeaters', label: 'Discover Repeaters' },
            { target: 'sensors', label: 'Discover Sensors' },
            { target: 'all', label: 'Discover Both' },
          ].map(({ target, label }) => (
            <Button
              key={target}
              type="button"
              variant="outline"
              onClick={() => handleDiscover(target as RadioDiscoveryTarget)}
              disabled={meshDiscoveryLoadingTarget !== null || !health?.radio_connected}
              className="w-full"
            >
              {meshDiscoveryLoadingTarget === target ? 'Listening...' : label}
            </Button>
          ))}
        </div>
        {!health?.radio_connected && (
          <p className="text-sm text-destructive">Radio not connected</p>
        )}
        {discoverError && (
          <p className="text-sm text-destructive" role="alert">
            {discoverError}
          </p>
        )}
        {meshDiscovery && (
          <div className="space-y-2 rounded-md border border-input bg-muted/20 p-3">
            <div className="flex items-center justify-between gap-4">
              <p className="text-sm font-medium">
                Last sweep: {meshDiscovery.results.length} node
                {meshDiscovery.results.length === 1 ? '' : 's'}
              </p>
              <p className="text-xs text-muted-foreground">
                {meshDiscovery.duration_seconds.toFixed(0)}s listen window
              </p>
            </div>
            {meshDiscovery.results.length === 0 ? (
              <p className="text-sm text-muted-foreground">
                No supported nodes responded during the last discovery sweep.
              </p>
            ) : (
              <div className="space-y-2">
                {meshDiscovery.results.map((result) => (
                  <div
                    key={result.public_key}
                    className="rounded-md border border-input bg-background px-3 py-2"
                  >
                    <div className="flex items-center justify-between gap-3">
                      <span className="text-sm font-medium">
                        {result.name ?? <span className="capitalize">{result.node_type}</span>}
                      </span>
                      <span className="text-xs text-muted-foreground">
                        heard {result.heard_count} time{result.heard_count === 1 ? '' : 's'}
                      </span>
                    </div>
                    {result.name && (
                      <p className="text-xs capitalize text-muted-foreground">{result.node_type}</p>
                    )}
                    <p className="mt-1 break-all font-mono text-xs text-muted-foreground">
                      {result.public_key}
                    </p>
                    <p className="mt-1 text-xs text-muted-foreground">
                      Heard here: {result.local_snr ?? 'n/a'} dB SNR / {result.local_rssi ?? 'n/a'}{' '}
                      dBm RSSI. Remote heard us: {result.remote_snr ?? 'n/a'} dB SNR.
                    </p>
                  </div>
                ))}
              </div>
            )}
          </div>
        )}
      </div>
    </div>
  );
}