import { useSeoMeta } from '@unhead/react';
import { Link, useSearchParams } from 'react-router-dom';
import { EditProfileForm } from '@/components/EditProfileForm';
import { SkaterDirectoryCard } from '@/components/SkaterDirectoryCard';
import { ProfilePreviewCard } from '@/components/ProfilePreviewCard';
import { RelayListManager } from '@/components/RelayListManager';

import { WalletModal } from '@/components/WalletModal';
import { SecuritySettings } from '@/components/SecuritySettings';
import { RelatrSettings } from '@/components/RelatrSettings';
import { CVMHealthCheck } from '@/components/CVMHealthCheck';
import { SasquatchAiStatusCard } from '@/components/SasquatchAiStatusCard';
import { GrantProCard } from '@/components/GrantProCard';
import { AdminReviewCard } from '@/components/AdminReviewCard';
import { RegionBackfillCard } from '@/components/RegionBackfillCard';
import { NotificationSettingsCard } from '@/components/NotificationSettingsCard';
import { CoordinatorSettingsCard } from '@/components/CoordinatorSettingsCard';
import { LanguageSelector } from '@/components/LanguageToggle';
import { DesktopNavManager } from '@/components/DesktopNavManager';
import { MyDataTab } from '@/components/MyDataTab';
import { useQueryClient } from '@tanstack/react-query';
import { useNostr } from '@nostrify/react';
import { NSchema as n, type NostrMetadata } from '@nostrify/nostrify';
import { useState } from 'react';
import { LoginArea } from '@/components/auth/LoginArea';
import { Button } from '@/components/ui/button';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useAppContext } from '@/hooks/useAppContext';
import { useCitrine } from '@/hooks/useCitrine';
import { toast } from '@/hooks/useToast';
import { cn } from '@/lib/utils';
import { NIP05_PROVIDERS } from '@/lib/nip05Providers';
import { SKATE_NIP05_DOMAIN } from '@/lib/skateNip05';
import { useTranslation } from '@/contexts/language';
import { User, Radio, Wallet, Wrench, RotateCcw, Shield, ExternalLink, Languages, RefreshCw, AlertCircle, Database, Package, ChevronRight, ChevronLeft, Smartphone, Download, Zap, WifiOff, Bell, Server } from 'lucide-react';

// ─── Types ────────────────────────────────────────────────────────────────────

type Section =
  | null
  | 'profile'
  | 'follows'
  | 'nip05'
  | 'security'
  | 'mydata'
  | 'language'
  | 'appearance'
  | 'relays'
  | 'wallet'
  | 'stash'
  | 'notifications'
  | 'coordinator'
  | 'advanced';

// ─── Back header ──────────────────────────────────────────────────────────────

function BackHeader({ title, onBack }: { title: string; onBack: () => void }) {
  const { t } = useTranslation();
  return (
    <div className="flex items-center gap-3 mb-5">
      <button
        onClick={onBack}
        aria-label={t('common.back')}
        className="flex items-center justify-center w-8 h-8 rounded-xl bg-white/5 hover:bg-white/10 active:scale-95 transition-all"
      >
        <ChevronLeft className="h-4 w-4 text-white" />
      </button>
      <h2 className="text-lg font-black uppercase tracking-wide text-white">{title}</h2>
    </div>
  );
}

// ─── Menu row ────────────────────────────────────────────────────────────────

function MenuRow({
  icon: Icon,
  label,
  sublabel,
  iconColor,
  iconBg,
  onClick,
  href,
  badge,
}: {
  icon: React.ComponentType<{ className?: string }>;
  label: string;
  sublabel?: string;
  iconColor: string;
  iconBg: string;
  onClick?: () => void;
  href?: string;
  badge?: string;
}) {
  const inner = (
    <div className="flex items-center gap-3 w-full py-3 px-4 hover:bg-white/5 active:scale-[0.99] transition-all">
      <div className={cn('w-9 h-9 rounded-xl flex items-center justify-center flex-shrink-0', iconBg)}>
        <Icon className={cn('h-4 w-4', iconColor)} />
      </div>
      <div className="flex-1 min-w-0">
        <p className="text-sm font-bold text-white leading-tight">{label}</p>
        {sublabel && <p className="text-xs text-muted-foreground leading-tight mt-0.5">{sublabel}</p>}
      </div>
      {badge && (
        <span className="text-[10px] font-bold px-2 py-0.5 rounded-full bg-[#ccff00]/20 text-[#ccff00] border border-[#ccff00]/30 flex-shrink-0">
          {badge}
        </span>
      )}
      <ChevronRight className="h-4 w-4 text-muted-foreground/50 flex-shrink-0" />
    </div>
  );

  if (href) {
    return <Link to={href} className="block">{inner}</Link>;
  }

  return <button onClick={onClick} className="w-full text-left">{inner}</button>;
}

// ─── Menu group ───────────────────────────────────────────────────────────────

function MenuGroup({ title, children }: { title: string; children: React.ReactNode }) {
  return (
    <div>
      <p className="text-[10px] font-black uppercase tracking-widest text-muted-foreground/50 px-4 mb-1">{title}</p>
      <div className="rounded-2xl border border-white/8 overflow-hidden divide-y divide-white/5 bg-white/2">
        {children}
      </div>
    </div>
  );
}

// ─── Profile sub-screen ───────────────────────────────────────────────────────

const PROFILE_FALLBACK_RELAYS = ['wss://purplepag.es', 'wss://relay.damus.io', 'wss://nos.lol'];

/**
 * A short "what's missing" nudge. Deliberately only lists genuinely empty
 * essentials — a new skater sees it, a finished profile never does — so it can't
 * read as nagging.
 */
function ProfileChecklist({ metadata }: { metadata?: NostrMetadata }) {
  const { t } = useTranslation();
  const items: string[] = [];
  if (!metadata?.name && !metadata?.display_name) items.push(t('settingsUi.settingsPage.checkDisplayName'));
  if (!metadata?.picture) items.push(t('settingsUi.settingsPage.checkPhoto'));
  if (!metadata?.about?.trim()) items.push(t('settingsUi.settingsPage.checkBio'));
  if (!metadata?.lud16 && !metadata?.lud06) items.push(t('settingsUi.settingsPage.checkLightning'));
  if (!metadata?.nip05) items.push(t('settingsUi.settingsPage.checkHandle'));

  if (items.length === 0) return null;

  return (
    <div className="rounded-2xl border border-[#ccff00]/25 bg-[#ccff00]/5 p-4">
      <p className="text-sm font-bold text-white">{t('settingsUi.settingsPage.finishProfile')}</p>
      <ul className="mt-2 space-y-1">
        {items.map((item) => (
          <li key={item} className="flex items-start gap-2 text-xs text-muted-foreground">
            <span className="mt-1.5 h-1 w-1 flex-shrink-0 rounded-full bg-[#ccff00]" />
            {t('settingsUi.settingsPage.addItem', { item })}
          </li>
        ))}
      </ul>
    </div>
  );
}

function ProfileScreen({ onBack }: { onBack: () => void }) {
  const { user, metadata, isLoadingProfile } = useCurrentUser();
  const { nostr } = useNostr();
  const { t } = useTranslation();
  const queryClient = useQueryClient();
  const [isRefreshing, setIsRefreshing] = useState(false);

  const handleRefresh = async () => {
    if (!user) return;
    setIsRefreshing(true);
    try {
      queryClient.invalidateQueries({ queryKey: ['author', user.pubkey] });
      let events = await nostr.query([{ kinds: [0], authors: [user.pubkey], limit: 1 }], { signal: AbortSignal.timeout(8000) });
      if (events.length === 0) {
        const fallback = nostr.group(PROFILE_FALLBACK_RELAYS);
        events = await fallback.query([{ kinds: [0], authors: [user.pubkey], limit: 1 }], { signal: AbortSignal.timeout(8000) });
      }
      if (events.length > 0) {
        const profileMetadata = n.json().pipe(n.metadata()).parse(events[0].content);
        queryClient.setQueryData(['author', user.pubkey], { metadata: profileMetadata, event: events[0] });
        toast({ title: t('settingsUi.settingsPage.profileRefreshed'), description: t('settingsUi.settingsPage.found', { name: profileMetadata.name || t('settingsUi.settingsPage.unnamed') }) });
      } else {
        toast({ title: t('settingsUi.settingsPage.profileNotFound'), description: t('settingsUi.settingsPage.notFoundOnRelay'), variant: 'destructive' });
      }
    } catch {
      toast({ title: t('settingsUi.settingsPage.refreshFailed'), description: t('settingsUi.settingsPage.refreshFailedDesc'), variant: 'destructive' });
    } finally {
      setIsRefreshing(false);
    }
  };

  return (
    <div>
      <BackHeader title={t('settingsUi.settingsPage.editProfile')} onBack={onBack} />
      {!user ? (
        <div className="text-center py-16">
          <User className="h-10 w-10 mx-auto mb-3 text-muted-foreground/40" />
          <p className="text-muted-foreground text-sm mb-5">{t('settingsUi.settingsPage.loginToEdit')}</p>
          <LoginArea className="justify-center" />
        </div>
      ) : (
        <div className="space-y-4">
          {/* How everyone else sees you (last saved profile). */}
          <ProfilePreviewCard />

          {/* Only warn when we truly have NOTHING — an account with a name but no
              bio is not "not loaded", and the checklist below covers that case. */}
          {!isLoadingProfile && !metadata && (
            <div className="flex items-center gap-3 p-3 rounded-2xl bg-yellow-950/30 border border-yellow-500/40">
              <AlertCircle className="h-4 w-4 text-yellow-500 flex-shrink-0" />
              <p className="text-xs text-yellow-200 flex-1">
                {t('settingsUi.settingsPage.noProfileRelays')}
              </p>
              <Button onClick={handleRefresh} disabled={isRefreshing} size="sm" variant="outline" className="border-yellow-500/50 text-yellow-400 hover:bg-yellow-500/10 flex-shrink-0 h-8">
                <RefreshCw className={cn('h-3.5 w-3.5', isRefreshing && 'animate-spin')} />
              </Button>
            </div>
          )}

          <ProfileChecklist metadata={metadata} />
          <SkaterDirectoryCard />
          <EditProfileForm />
        </div>
      )}
    </div>
  );
}

// ─── NIP-05 sub-screen ────────────────────────────────────────────────────────

function Nip05Screen({ onBack }: { onBack: () => void }) {
  const providers = NIP05_PROVIDERS;
  const { t } = useTranslation();

  return (
    <div>
      <BackHeader title={t('settingsUi.settingsPage.nip05Title')} onBack={onBack} />
      <div className="space-y-4">
        <p className="text-sm text-muted-foreground leading-relaxed">
          {t('settingsUi.settingsPage.nip05Desc')}
        </p>
        <div className="rounded-2xl border border-[#ccff00]/25 bg-[#ccff00]/5 p-4 space-y-2">
          <p className="text-sm font-bold text-white">{t('settingsUi.settingsPage.freeFromSkateSpots')}</p>
          <p className="text-xs text-muted-foreground">
            {t('settingsUi.settingsPage.claimHandleBefore')}{' '}
            <span className="font-mono text-foreground">you@{SKATE_NIP05_DOMAIN}</span> {t('settingsUi.settingsPage.claimHandleAfter')}
          </p>
          <Link to="/settings?section=profile">
            <Button
              size="sm"
              variant="outline"
              className="border-[#ccff00]/40 text-[#ccff00] hover:bg-[#ccff00]/10"
            >
              {t('settingsUi.settingsPage.claimInProfile')}
            </Button>
          </Link>
        </div>
        <div className="rounded-2xl border border-white/8 overflow-hidden divide-y divide-white/5">
          {providers.map((p) => (
            <a
              key={p.name}
              href={p.url}
              target="_blank"
              rel="noopener noreferrer"
              className="flex items-center justify-between px-4 py-3.5 hover:bg-white/5 active:scale-[0.99] transition-all"
            >
              <div>
                <p className="text-sm font-bold text-white">{p.name}</p>
                <p className="text-xs text-muted-foreground">{p.desc}</p>
              </div>
              <div className="flex items-center gap-2 flex-shrink-0">
                <span className={cn('text-[10px] font-bold px-2 py-0.5 rounded-full border', p.free ? 'bg-green-500/15 text-green-400 border-green-500/30' : 'bg-yellow-500/15 text-yellow-400 border-yellow-500/30')}>
                  {p.free ? t('common.free') : t('settingsUi.nip05Required.paid')}
                </span>
                <ExternalLink className="h-3.5 w-3.5 text-muted-foreground" />
              </div>
            </a>
          ))}
        </div>
        <div className="p-3 rounded-2xl bg-[#ccff00]/5 border border-[#ccff00]/20 text-xs text-muted-foreground">
          {t('settingsUi.settingsPage.nip05Footer')}
        </div>
      </div>
    </div>
  );
}

// ─── Local relay (Citrine) card ───────────────────────────────────────────────

/**
 * Android-only opt-in for the local on-device Citrine relay. Renders nothing on
 * non-Android platforms (citrine.possible === false). When enabled, the local
 * relay is folded into skate-content reads (instant local hits) and writes
 * (on-device backup + offline capture) via useSkateRelays.
 *
 * UX states:
 *   off        — muted, invites the user to speed things up.
 *   searching  — enabled, probe in flight: breathing lime dot.
 *   live       — enabled + reachable: glowing lime, benefit chips, celebratory.
 *   waiting    — enabled + not reachable: orange, actionable install CTA.
 */
function CitrineCard() {
  const citrine = useCitrine();
  const { t } = useTranslation();

  // Not on native Android → the local relay can't exist. Hide entirely.
  if (!citrine.possible) return null;

  // Normal computed state. In dev preview (citrine.preview set), a forced state
  // overrides it purely for visual review — real relay behaviour is unaffected.
  const computedState: 'off' | 'searching' | 'live' | 'waiting' = !citrine.enabled
    ? 'off'
    : citrine.reachable
      ? 'live'
      : citrine.probing || !citrine.settled
        ? 'searching'
        : 'waiting';

  const state = citrine.preview ?? computedState;
  // Treat any non-off forced preview state as "enabled" so the expanded detail
  // (chips / CTA / status) renders for review.
  const enabled = citrine.preview ? citrine.preview !== 'off' : citrine.enabled;
  // Spinner reflects a real probe, or a forced "searching" preview state.
  const probing = citrine.probing || state === 'searching';

  const handleToggle = () => {
    // In dev preview we don't mutate the real setting — the forced state owns
    // the visuals. Toggling is a no-op for review (avoids a misleading toast and
    // flipping the underlying config while inspecting the UI).
    if (citrine.preview) return;

    const next = !citrine.enabled;
    citrine.setEnabled(next);
    toast({
      title: next ? t('settingsUi.settingsPage.localRelayOn') : t('settingsUi.settingsPage.localRelayOff'),
      description: next
        ? t('settingsUi.settingsPage.lookingForCitrine')
        : t('settingsUi.settingsPage.noLongerUsing'),
    });
  };

  return (
    <div
      className={cn(
        'rounded-2xl border overflow-hidden transition-all duration-500',
        state === 'live'
          ? 'border-[#ccff00]/40 bg-[#ccff00]/[0.05] shadow-[0_0_28px_-8px_rgba(204,255,0,0.35)]'
          : state === 'waiting'
            ? 'border-orange-500/25 bg-orange-500/[0.04]'
            : 'border-white/8 bg-white/3',
      )}
    >
      {/* Header row */}
      <div className="flex items-center justify-between gap-3 p-4">
        <div className="flex items-center gap-3 min-w-0">
          {/* Icon tile with live status pip */}
          <div className="relative flex-shrink-0">
            <div
              className={cn(
                'w-10 h-10 rounded-xl flex items-center justify-center transition-colors duration-500',
                state === 'live'
                  ? 'bg-[#ccff00]/15'
                  : state === 'waiting'
                    ? 'bg-orange-500/10'
                    : 'bg-white/5',
              )}
            >
              <Smartphone
                className={cn(
                  'w-[18px] h-[18px] transition-colors duration-500',
                  state === 'live'
                    ? 'text-[#ccff00]'
                    : state === 'waiting'
                      ? 'text-orange-400'
                      : 'text-white/70',
                )}
              />
            </div>
            {enabled && (
              <span
                aria-hidden="true"
                className={cn(
                  'absolute -top-0.5 -right-0.5 w-3 h-3 rounded-full border-2 border-black motion-reduce:animate-none',
                  state === 'live' && 'bg-[#ccff00] animate-status-live',
                  state === 'searching' && 'bg-[#ccff00] animate-status-breathe',
                  state === 'waiting' && 'bg-orange-500',
                )}
              />
            )}
          </div>

          <div className="min-w-0">
            <p className="text-sm font-bold text-white flex items-center gap-2 leading-none">
              {t('settingsUi.settingsPage.localRelay')}
              <span
                className={cn(
                  'text-[9px] font-black uppercase tracking-[0.15em] transition-colors',
                  state === 'live' ? 'text-[#ccff00]' : 'text-white/40',
                )}
              >
                Citrine
              </span>
            </p>
            <p
              className={cn(
                'text-xs mt-1 transition-colors duration-300',
                state === 'live'
                  ? 'text-[#ccff00]/90'
                  : state === 'waiting'
                    ? 'text-orange-300/80'
                    : 'text-muted-foreground',
              )}
            >
              {state === 'off' && t('settingsUi.settingsPage.citrineOff')}
              {state === 'searching' && t('settingsUi.settingsPage.citrineSearching')}
              {state === 'live' && t('settingsUi.settingsPage.citrineLive')}
              {state === 'waiting' && t('settingsUi.settingsPage.citrineWaiting')}
            </p>
          </div>
        </div>

        {/* Toggle */}
        <button
          onClick={handleToggle}
          className={cn(
            'relative w-11 h-6 rounded-full transition-all duration-300 flex-shrink-0 active:scale-95',
            enabled ? 'bg-[#ccff00]' : 'bg-white/10',
          )}
          role="switch"
          aria-checked={enabled}
          aria-label={t('settingsUi.settingsPage.toggleCitrine')}
        >
          <span
            className={cn(
              'absolute top-0.5 w-5 h-5 rounded-full bg-black transition-all duration-300 ease-out',
              enabled ? 'left-[calc(100%-22px)]' : 'left-0.5',
            )}
          />
        </button>
      </div>

      {/* Expanding detail — only when enabled */}
      {enabled && (
        <div className="px-4 pb-4 space-y-3 animate-in fade-in slide-in-from-top-1 duration-300 motion-reduce:animate-none">
          {/* Status row + recheck */}
          <div className="flex items-center gap-2 text-xs">
            <span
              aria-hidden="true"
              className={cn(
                'inline-flex w-2 h-2 rounded-full motion-reduce:animate-none',
                state === 'live' && 'bg-[#ccff00] animate-status-live',
                state === 'searching' && 'bg-[#ccff00] animate-status-breathe',
                state === 'waiting' && 'bg-orange-500',
              )}
            />
            <span
              role="status"
              aria-live="polite"
              className={cn(
                'font-medium',
                state === 'live'
                  ? 'text-[#ccff00]'
                  : state === 'searching'
                    ? 'text-[#ccff00]/70'
                    : 'text-orange-400',
              )}
            >
              {state === 'live' && t('settingsUi.settingsPage.citrineDetected')}
              {state === 'searching' && t('settingsUi.settingsPage.citrineLooking')}
              {state === 'waiting' && t('settingsUi.settingsPage.citrineNotDetected')}
            </span>
            <button
              onClick={() => citrine.recheck()}
              disabled={probing}
              aria-label={t('settingsUi.settingsPage.recheckCitrine')}
              className={cn(
                'ml-auto inline-flex items-center gap-1 rounded-full px-2 py-1 -mr-1 text-muted-foreground',
                'hover:text-white hover:bg-white/5 transition-colors disabled:opacity-50',
              )}
            >
              <RefreshCw className={cn('w-3 h-3 motion-reduce:animate-none', probing && 'animate-spin')} />
              {probing ? t('settingsUi.settingsPage.checking') : t('settingsUi.settingsPage.recheck')}
            </button>
          </div>

          {/* LIVE: benefit chips — the reward for connecting */}
          {state === 'live' && (
            <div className="flex flex-wrap gap-1.5 animate-pop-in motion-reduce:animate-none">
              {[
                { icon: Zap, label: t('settingsUi.settingsPage.chipInstantReads') },
                { icon: WifiOff, label: t('settingsUi.settingsPage.chipWorksOffline') },
                { icon: Database, label: t('settingsUi.settingsPage.chipOnDeviceBackup') },
              ].map(({ icon: Icon, label }) => (
                <span
                  key={label}
                  className="inline-flex items-center gap-1 rounded-full bg-[#ccff00]/12 border border-[#ccff00]/25 px-2.5 py-1 text-[10px] font-bold text-[#ccff00]"
                >
                  <Icon className="w-3 h-3" />
                  {label}
                </span>
              ))}
            </div>
          )}

          {/* WAITING: install / start CTA */}
          {state === 'waiting' && (
            <div className="rounded-xl border border-orange-500/20 bg-orange-500/[0.06] p-3 space-y-2.5">
              <p className="text-[11px] leading-relaxed text-orange-100/90">
                <strong className="text-orange-300">{t('settingsUi.settingsPage.cantReachStrong')}</strong>{' '}
                {t('settingsUi.settingsPage.cantReachBefore')}
                <em> {t('settingsUi.settingsPage.started')}</em>{t('settingsUi.settingsPage.cantReachAfter')}
              </p>
              <ol className="text-[11px] leading-relaxed text-orange-100/70 list-decimal list-inside space-y-0.5">
                <li>{t('settingsUi.settingsPage.citrineStep1Before')} <strong className="text-orange-200">{t('settingsUi.settingsPage.start')}</strong></li>
                <li>{t('settingsUi.settingsPage.citrineStep2Before')} <strong className="text-orange-200">{t('settingsUi.settingsPage.recheck')}</strong></li>
              </ol>
              <a
                href="https://github.com/greenart7c3/Citrine"
                target="_blank"
                rel="noopener noreferrer"
                className="inline-flex items-center gap-1.5 rounded-full bg-[#ccff00] px-3 py-1.5 text-[11px] font-black uppercase tracking-wide text-black hover:bg-[#ccff00]/90 active:scale-95 transition-all"
              >
                <Download className="w-3.5 h-3.5" /> {t('settingsUi.settingsPage.getCitrine')}
                <ExternalLink className="w-2.5 h-2.5" />
              </a>
            </div>
          )}

          {/* Privacy reassurance — always present when enabled */}
          <div className="flex items-start gap-2 rounded-xl bg-black/20 border border-white/5 p-2.5">
            <Shield className="w-3.5 h-3.5 text-white/40 flex-shrink-0 mt-0.5" />
            <p className="text-[10px] leading-relaxed text-muted-foreground/70">
              {t('settingsUi.settingsPage.citrinePrivacy')}
            </p>
          </div>
        </div>
      )}
    </div>
  );
}

// ─── Relays sub-screen ────────────────────────────────────────────────────────

function RelaysScreen({ onBack }: { onBack: () => void }) {
  const { user } = useCurrentUser();
  const { config, updateConfig } = useAppContext();
  const { t } = useTranslation();
  const useSkateRelay = config.useSkateRelay ?? true;

  const handleToggle = () => {
    updateConfig((current) => ({ ...current, useSkateRelay: !useSkateRelay }));
    toast({
      title: useSkateRelay ? t('settingsUi.settingsPage.communityRelayDisabled') : t('settingsUi.settingsPage.communityRelayEnabled'),
      description: useSkateRelay ? t('settingsUi.settingsPage.usingOnlyPersonal') : t('settingsUi.settingsPage.skateRelayIncluded'),
    });
  };

  return (
    <div>
      <BackHeader title={t('settingsUi.settingsPage.relays')} onBack={onBack} />
      <div className="space-y-4">
        {/* Privacy note — next to the relay list, where the thought actually occurs.
            Deliberately neutral: no VPN brand, just "free is a warning sign". */}
        <div className="flex items-start gap-3 rounded-2xl border border-white/8 bg-white/3 p-4">
          <Shield className="h-4 w-4 shrink-0 mt-0.5 text-[#ccff00]" />
          <p className="text-xs leading-relaxed text-muted-foreground">
            {t('settingsUi.settingsPage.relayPrivacyBefore')} <strong className="text-white">{t('settingsUi.settingsPage.ipAddress')}</strong> {t('settingsUi.settingsPage.relayPrivacyAfter')}{' '}
            <Link to="/privacy" className="text-[#ccff00]/80 underline hover:text-[#ccff00]">
              {t('common.learnMore')}
            </Link>
          </p>
        </div>
        {user && (
          <div className="flex items-center justify-between p-4 rounded-2xl bg-white/3 border border-white/8">
            <div className="flex-1 min-w-0">
              <p className="text-sm font-bold text-white">{t('settingsUi.settingsPage.communityRelay')}</p>
              <p className="text-xs text-muted-foreground mt-0.5">
                {useSkateRelay ? t('settingsUi.settingsPage.syncingGlobal') : t('settingsUi.settingsPage.usingOnlyPersonalShort')}
              </p>
            </div>
            <button
              onClick={handleToggle}
              className={cn(
                'relative w-11 h-6 rounded-full transition-all flex-shrink-0',
                useSkateRelay ? 'bg-[#ccff00]' : 'bg-white/10'
              )}
            >
              <span className={cn(
                'absolute top-0.5 w-5 h-5 rounded-full bg-black transition-all',
                useSkateRelay ? 'left-[calc(100%-22px)]' : 'left-0.5'
              )} />
            </button>
          </div>
        )}
        <CitrineCard />
        <RelayListManager />
      </div>
    </div>
  );
}

// ─── Appearance sub-screen ────────────────────────────────────────────────────

function AppearanceScreen({ onBack }: { onBack: () => void }) {
  const { t } = useTranslation();
  return (
    <div>
      <BackHeader title={t('settingsUi.settingsPage.appearance')} onBack={onBack} />
      <div className="space-y-4">
        <div>
          <p className="text-[10px] font-black uppercase tracking-widest text-muted-foreground/50 mb-2">{t('settingsUi.settingsPage.language')}</p>
          <div className="rounded-2xl border border-white/8 p-4 bg-white/2">
            <LanguageSelector />
          </div>
        </div>
        <div className="rounded-2xl border border-white/8 p-5 bg-white/2 text-center">
          <div className="text-3xl mb-3">🌙</div>
          <p className="font-black text-white uppercase tracking-wide text-sm mb-2">{t('settingsUi.settingsPage.darkModeOnly')}</p>
          <p className="text-xs text-muted-foreground leading-relaxed">
            {t('settingsUi.settingsPage.darkModeDesc')}
          </p>
        </div>

        {/* Desktop top-nav customization (Option B). Only relevant on wider
            screens, so hide the control on mobile where the bottom-bar
            customizer is used instead. */}
        <div className="hidden md:block">
          <p className="text-[10px] font-black uppercase tracking-widest text-muted-foreground/50 mb-2">{t('settingsUi.settingsPage.navigation')}</p>
          <div className="rounded-2xl border border-white/8 p-4 bg-white/2">
            <DesktopNavManager />
          </div>
        </div>
      </div>
    </div>
  );
}

// ─── Advanced sub-screen ──────────────────────────────────────────────────────

function AdvancedScreen({ onBack }: { onBack: () => void }) {
  const { t } = useTranslation();
  const handleResetSasquatch = () => {
    localStorage.removeItem('sasquatch-minimized');
    alert(t('settingsUi.settingsPage.sasquatchExpanded'));
    window.location.reload();
  };

  return (
    <div>
      <BackHeader title={t('settingsUi.settingsPage.advanced')} onBack={onBack} />
      <div className="space-y-4">
        <RelatrSettings />
        {/* Owner-only — render null for everyone except platform owners. */}
        <CVMHealthCheck />
        <SasquatchAiStatusCard />
        <GrantProCard />
        <AdminReviewCard />
        <RegionBackfillCard />
        <div className="rounded-2xl border border-amber-500/20 overflow-hidden bg-white/2">
          <div className="px-4 py-3.5 border-b border-white/5">
            <p className="text-sm font-bold text-amber-400">{t('settingsUi.settingsPage.sasquatchGuide')}</p>
            <p className="text-xs text-muted-foreground mt-0.5">{t('settingsUi.settingsPage.sasquatchResetDesc')}</p>
          </div>
          <div className="px-4 py-3.5">
            <button
              onClick={handleResetSasquatch}
              className="flex items-center gap-2 text-sm font-bold text-amber-400 hover:text-amber-300 transition-colors"
            >
              <RotateCcw className="h-4 w-4" />
              {t('settingsUi.settingsPage.expandSasquatch')}
            </button>
          </div>
        </div>
      </div>
    </div>
  );
}

// ─── Wallet sub-screen ────────────────────────────────────────────────────────

function WalletScreen({ onBack }: { onBack: () => void }) {
  const { user } = useCurrentUser();
  const { t } = useTranslation();
  return (
    <div>
      <BackHeader title={t('settingsUi.settingsPage.wallet')} onBack={onBack} />
      {!user ? (
        <div className="text-center py-16">
          <Wallet className="h-10 w-10 mx-auto mb-3 text-muted-foreground/40" />
          <p className="text-muted-foreground text-sm mb-5">{t('settingsUi.settingsPage.loginToWallet')}</p>
          <LoginArea className="justify-center" />
        </div>
      ) : (
        <div className="space-y-3">
          <Link to="/wallet" className="flex items-center justify-between p-4 rounded-2xl bg-orange-500/10 border border-orange-500/20 hover:bg-orange-500/15 active:scale-[0.99] transition-all">
            <div className="flex items-center gap-3">
              <div className="w-9 h-9 rounded-xl bg-orange-500/20 flex items-center justify-center">
                <Wallet className="h-4 w-4 text-orange-400" />
              </div>
              <div>
                <p className="text-sm font-bold text-white">{t('settingsUi.settingsPage.openWallet')}</p>
                <p className="text-xs text-muted-foreground">{t('settingsUi.settingsPage.balanceSendReceive')}</p>
              </div>
            </div>
            <ChevronRight className="h-4 w-4 text-muted-foreground/50" />
          </Link>

          <WalletModal>
            <button className="w-full flex items-center justify-between p-4 rounded-2xl bg-purple-500/10 border border-purple-500/20 hover:bg-purple-500/15 active:scale-[0.99] transition-all">
              <div className="flex items-center gap-3">
                <div className="w-9 h-9 rounded-xl bg-purple-500/20 flex items-center justify-center">
                  <ExternalLink className="h-4 w-4 text-purple-400" />
                </div>
                <div className="text-left">
                  <p className="text-sm font-bold text-white">{t('settingsUi.settingsPage.connectNwc')}</p>
                  <p className="text-xs text-muted-foreground">Alby, Minibits, Zeus, Coinos</p>
                </div>
              </div>
              <ChevronRight className="h-4 w-4 text-muted-foreground/50" />
            </button>
          </WalletModal>
        </div>
      )}
    </div>
  );
}

// ─── Main settings menu ───────────────────────────────────────────────────────

function SettingsMenu({ onNavigate }: { onNavigate: (s: Section) => void }) {
  const { user, metadata } = useCurrentUser();
  const { t } = useTranslation();

  return (
    <div className="space-y-5">
      {/* Account */}
      <MenuGroup title={t('settingsUi.settingsPage.account')}>
        <MenuRow
          icon={User}
          label={t('settingsUi.settingsPage.editProfile')}
          sublabel={metadata?.name ?? (user ? t('settingsUi.settingsPage.notLoaded') : t('settingsUi.settingsPage.notLoggedIn'))}
          iconColor="text-[#ccff00]"
          iconBg="bg-[#ccff00]/15"
          onClick={() => onNavigate('profile')}
        />
        <MenuRow
          icon={Shield}
          label={t('settingsUi.settingsPage.security')}
          sublabel={t('settingsUi.settingsPage.securitySub')}
          iconColor="text-red-400"
          iconBg="bg-red-500/15"
          onClick={() => onNavigate('security')}
        />
        <MenuRow
          icon={User}
          label={t('settingsUi.settingsPage.nip05Title')}
          sublabel={t('settingsUi.settingsPage.nip05Sub')}
          iconColor="text-blue-400"
          iconBg="bg-blue-500/15"
          onClick={() => onNavigate('nip05')}
        />
      </MenuGroup>

      {/* App */}
      <MenuGroup title={t('settingsUi.settingsPage.app')}>
        <MenuRow
          icon={Wallet}
          label={t('settingsUi.settingsPage.wallet')}
          sublabel="Lightning, Cashu, NWC"
          iconColor="text-orange-400"
          iconBg="bg-orange-500/15"
          onClick={() => onNavigate('wallet')}
        />
        <MenuRow
          icon={Package}
          label={t('settingsUi.settingsPage.myStash')}
          sublabel={t('settingsUi.settingsPage.myStashSub')}
          iconColor="text-purple-400"
          iconBg="bg-purple-500/15"
          href="/stash"
        />
        <MenuRow
          icon={Radio}
          label={t('settingsUi.settingsPage.relays')}
          sublabel={t('settingsUi.settingsPage.relaysSub')}
          iconColor="text-cyan-400"
          iconBg="bg-cyan-500/15"
          onClick={() => onNavigate('relays')}
        />
        <MenuRow
          icon={Languages}
          label={t('settingsUi.settingsPage.appearance')}
          sublabel={t('settingsUi.settingsPage.appearanceSub')}
          iconColor="text-pink-400"
          iconBg="bg-pink-500/15"
          onClick={() => onNavigate('appearance')}
        />
        <MenuRow
          icon={Bell}
          label={t('settingsUi.settingsPage.notifications')}
          sublabel={t('settingsUi.settingsPage.notificationsSub')}
          iconColor="text-yellow-400"
          iconBg="bg-yellow-500/15"
          onClick={() => onNavigate('notifications')}
        />
        <MenuRow
          icon={Server}
          label={t('settingsUi.settingsPage.coordinator')}
          sublabel={t('settingsUi.settingsPage.coordinatorSub')}
          iconColor="text-cyan-400"
          iconBg="bg-cyan-500/15"
          onClick={() => onNavigate('coordinator')}
        />
      </MenuGroup>

      {/* Data & Advanced */}
      <MenuGroup title={t('settingsUi.settingsPage.data')}>
        <MenuRow
          icon={Database}
          label={t('settingsUi.settingsPage.myData')}
          sublabel={t('settingsUi.settingsPage.myDataSub')}
          iconColor="text-green-400"
          iconBg="bg-green-500/15"
          onClick={() => onNavigate('mydata')}
        />
        <MenuRow
          icon={Wrench}
          label={t('settingsUi.settingsPage.advanced')}
          sublabel={t('settingsUi.settingsPage.advancedSub')}
          iconColor="text-gray-400"
          iconBg="bg-white/8"
          onClick={() => onNavigate('advanced')}
        />
      </MenuGroup>

      {/* Login area */}
      {!user && (
        <div className="pt-2">
          <LoginArea className="w-full" />
        </div>
      )}
    </div>
  );
}

// ─── Page ─────────────────────────────────────────────────────────────────────

export default function SettingsPage() {
  const { t } = useTranslation();
  useSeoMeta({
    title: t('settingsUi.settingsPage.seoTitle'),
    description: t('settingsUi.settingsPage.seoDescription'),
  });

  const [searchParams] = useSearchParams();

  // Allow deep-linking into a specific section via ?section=profile etc.
  // Only sections that actually render are accepted; anything else (e.g. a
  // stale bookmark to ?section=language) falls back to the menu rather than a
  // blank screen with no way back.
  const RENDERABLE_SECTIONS: Section[] = [
    'profile', 'security', 'nip05', 'mydata', 'relays', 'appearance', 'wallet', 'notifications', 'coordinator', 'advanced',
  ];
  const requestedSection = searchParams.get('section') as Section;
  const initialSection =
    requestedSection && RENDERABLE_SECTIONS.includes(requestedSection) ? requestedSection : null;
  const [section, setSection] = useState<Section>(initialSection);

  const handleNavigate = (s: Section) => setSection(s);
  const handleBack = () => setSection(null);

  return (
    <>
      <div className="container px-4 py-5 max-w-lg mx-auto">
        {/* Header — only shown on the main menu */}
        {!section && (
          <div className="mb-5">
            <h1 className="text-4xl md:text-5xl font-black uppercase leading-none mb-1">
              <span className="text-white">{t('settingsUi.settingsPage.heading')}</span>
            </h1>
            <p className="text-muted-foreground text-sm">{t('settingsUi.settingsPage.subtitle')}</p>
          </div>
        )}

        {/* Sub-screens */}
        {section === 'profile' && <ProfileScreen onBack={handleBack} />}
        {section === 'security' && (
          <div>
            <BackHeader title={t('settingsUi.settingsPage.security')} onBack={handleBack} />
            <SecuritySettings />
          </div>
        )}
        {section === 'nip05' && <Nip05Screen onBack={handleBack} />}
        {section === 'mydata' && (
          <div>
            <BackHeader title={t('settingsUi.settingsPage.myData')} onBack={handleBack} />
            <MyDataTab />
          </div>
        )}
        {section === 'relays' && <RelaysScreen onBack={handleBack} />}
        {section === 'appearance' && <AppearanceScreen onBack={handleBack} />}
        {section === 'wallet' && <WalletScreen onBack={handleBack} />}
        {section === 'notifications' && (
          <div>
            <BackHeader title={t('settingsUi.settingsPage.notifications')} onBack={handleBack} />
            <NotificationSettingsCard />
          </div>
        )}
        {section === 'coordinator' && (
          <div>
            <BackHeader title={t('settingsUi.settingsPage.coordinator')} onBack={handleBack} />
            <CoordinatorSettingsCard />
          </div>
        )}
        {section === 'advanced' && <AdvancedScreen onBack={handleBack} />}

        {/* Main menu */}
        {!section && <SettingsMenu onNavigate={handleNavigate} />}
      </div>
    </>
  );
}