import { useMemo, useState } from 'react';
import { useSeoMeta } from '@unhead/react';
import { Link, useNavigate, useSearchParams } from 'react-router-dom';
import { nip19 } from 'nostr-tools';
import { ExternalLink, Zap, Heart, Users, Handshake, Building2, Star, ShieldCheck, Server, Globe, Bot, Code2, Briefcase, Megaphone, TrendingUp, Info, Lock, EyeOff, Copy, Check, ChevronDown } from 'lucide-react';
import { SupportSkateSpots } from '@/components/SupportSkateSpots';
import { SilentPaymentsCard } from '@/components/SilentPaymentsCard';
import { AngorProjectCard, ANGOR_PROJECT_URL } from '@/components/AngorProjectCard';
import { WaysToSupport } from '@/components/WaysToSupport';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
import { BACKERS, BACKERS_TOTAL_SATS, tierOf } from '@/lib/backers';
import { formatDistanceToNow } from '@/lib/dateFnsI18n';
import { useAuthor } from '@/hooks/useAuthor';
import { useGrowthStats } from '@/hooks/useGrowthStats';
import { PLATFORM_OWNER_PUBKEYS } from '@/hooks/useListingRestrictions';
import { useSatsToUsd } from '@/hooks/useExchangeRate';
import { useZapLeaderboard } from '@/hooks/useZapLeaderboard';
import { useTranslation } from '@/contexts/language';
import { Input } from '@/components/ui/input';
import { Textarea } from '@/components/ui/textarea';
import { Label } from '@/components/ui/label';
import { Button } from '@/components/ui/button';
import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from '@/components/ui/dialog';
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
import { useToast } from '@/hooks/useToast';


// Only count support received from this point (the project's public launch era).
// Zaps to the platform before this are ignored. NOTE: as of 2026-10-05 every
// platform zap is already ≥ 2026-01, so this doesn't currently trim the list —
// the visible cap below is what keeps it short.
const SUPPORTERS_SINCE = Math.floor(Date.UTC(2025, 11, 1) / 1000); // 2025-12-01
const VISIBLE_LIMIT = 12;

/** npub → hex pubkey (useAuthor queries relays by HEX authors). */
function npubToHex(npub?: string): string | undefined {
  if (!npub) return undefined;
  try {
    const d = nip19.decode(npub);
    return d.type === 'npub' ? d.data : undefined;
  } catch {
    return undefined;
  }
}

// ─── Static data — edit these arrays to add/remove entries ──────────────────

interface Collaborator {
  name: string;
  role: string;
  avatar?: string; // URL or leave blank for placeholder
  npub?: string;   // Nostr npub — links to their profile
  url?: string;    // fallback link
}

interface Partner {
  name: string;
  logo?: string;   // URL to logo (SVG/PNG transparent preferred)
  url: string;
  description: string;
}

interface Friend {
  name: string;
  logo?: string;   // URL to logo (SVG/PNG transparent preferred, min 200×200px)
  invertLogo?: boolean; // true if logo is dark and needs inversion for dark backgrounds
  url: string;
  tagline?: string;
}

const COLLABORATORS: Collaborator[] = [
  // Add collaborators here — mix of Nostr users and external people
  // Example:
  // { name: 'Alice', role: 'Developer', npub: 'npub1...', avatar: 'https://...' },
  // { name: 'Bob', role: 'Relay Operator', url: 'https://...' },
];

const PARTNERS: Partner[] = [
  {
    name: 'SNT4EVER',
    logo: 'https://blossom.ditto.pub/f6e1d75ed8123b860ca139ee2d43a0a1238b89a0bec24752d9fe48cc41aa5d4c.png',
    url: 'https://www.snt4ever.cat/',
    description: 'Bringing back up Sants Estació',
  },
  // Add partners here
  // Format: { name: 'Example', logo: 'https://...', url: 'https://...', description: 'Short description' }
  // Logo: PNG/WebP transparent background preferred
];

const FRIENDS: Friend[] = [
  {
    name: 'No Teeth Skateboarding',
    logo: 'https://blossom.dreamith.to/61bb7055930c442dfe1dfe5b8a8be5417f9b62f68ed79dc4ffbbddce5d4f122c.png',
    url: 'https://www.instagram.com/noteethskateboarding/',
    tagline: 'Hand-made Long Lasting Skateboards',
  },
  {
    name: 'SNT4EVER',
    logo: 'https://blossom.ditto.pub/f6e1d75ed8123b860ca139ee2d43a0a1238b89a0bec24752d9fe48cc41aa5d4c.png',
    invertLogo: true,
    url: 'https://www.snt4ever.cat/',
    tagline: 'Bringing back up Sants Estació',
  },
  {
    name: 'RK69 DIY Skatepark',
    logo: 'https://blossom.ditto.pub/0d1d3855e7922b4ad7c10332e14723a16525e7aa26d95c58ea1dc1ec75514c3c.png',
    url: 'https://www.instagram.com/rk69diyskatepark',
    tagline: 'DIY Skatepark 101%',
  },
  {
    name: 'Suan Luang Backyard',
    logo: 'https://blossom.ditto.pub/8ac40ffbf9db9c9bff20e9b34d627a31b9c2044fe4f534948292516319684523.jpeg',
    url: 'https://www.slbskate.com/',
    tagline: "Bangkok's most famous Backyard DIY Spot",
  },
  // Add more friends here
];

// ─── "What your support pays for" (words only — no figures) ──────────────────

const PAYS_FOR = [
  { icon: Server, key: 'walletUi.supporters.payRelay', desc: 'walletUi.supporters.payRelayDesc' },
  { icon: Globe, key: 'walletUi.supporters.payDomain', desc: 'walletUi.supporters.payDomainDesc' },
  { icon: Bot, key: 'walletUi.supporters.payAi', desc: 'walletUi.supporters.payAiDesc' },
  { icon: Code2, key: 'walletUi.supporters.payDev', desc: 'walletUi.supporters.payDevDesc' },
  { icon: Briefcase, key: 'walletUi.supporters.payOps', desc: 'walletUi.supporters.payOpsDesc' },
  { icon: Megaphone, key: 'walletUi.supporters.payMarketing', desc: 'walletUi.supporters.payMarketingDesc' },
] as const;

// ─── Silent-payments donation card (BIP-353 name → BIP-321 URI) ──────────────


// ─── Bitcoin grantmaker inquiry ──────────────────────────────────────────────

function GrantmakerForm() {
  const { t } = useTranslation();
  const navigate = useNavigate();
  const { toast } = useToast();
  const owner = PLATFORM_OWNER_PUBKEYS[0];
  const [org, setOrg] = useState('');
  const [contact, setContact] = useState('');
  const [website, setWebsite] = useState('');
  const [program, setProgram] = useState('');
  const [grantSize, setGrantSize] = useState('');
  const [kyc, setKyc] = useState('');
  const [fund, setFund] = useState('');
  const [ack, setAck] = useState(false);
  const [reviewOpen, setReviewOpen] = useState(false);
  const [copied, setCopied] = useState(false);

  const websiteError = website.trim() && !/^https?:\/\/\S+$/i.test(website.trim())
    ? t('walletUi.supporters.grantsWebsiteInvalid')
    : '';
  const canSend = !!org.trim() && !!contact.trim() && ack && !websiteError && !!owner;
  const message = [
    'Bitcoin grantmaker inquiry — SkateSpots',
    '',
    `Organization: ${org.trim()}`,
    `Contact: ${contact.trim()}`,
    website.trim() ? `Website: ${website.trim()}` : '',
    program.trim() ? `Program / round: ${program.trim()}` : '',
    grantSize.trim() ? `Grant size: ${grantSize.trim()}` : '',
    kyc.trim() ? `KYC / KYB process: ${kyc.trim()}` : '',
    fund.trim() ? `What we would like to fund: ${fund.trim()}` : '',
    '',
    'I confirm this is a grantmaker inquiry and we KYC/KYB our grantees.',
  ].filter(Boolean).join('\n');

  const copyMessage = async () => {
    try {
      await navigator.clipboard.writeText(message);
      setCopied(true);
      toast({ title: t('walletUi.supporters.grantsCopied') });
      window.setTimeout(() => setCopied(false), 2000);
    } catch {
      toast({ title: t('walletUi.supporters.grantsCopyFailed'), variant: 'destructive' });
    }
  };

  const openDm = () => {
    if (!canSend || !owner) return;
    navigate(`/messages/${nip19.npubEncode(owner)}?message=${encodeURIComponent(message)}`);
  };

  const inputClass = 'border-[#f7931a]/25 bg-black/50 text-white placeholder:text-gray-500';

  return (
    <div className="rounded-2xl border-2 border-[#f7931a]/30 bg-gradient-to-br from-[#f7931a]/10 via-black to-transparent p-4 sm:p-6">
      <div className="flex items-start gap-3">
        <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-xl bg-[#f7931a]/15 text-[#f7931a]">
          <Handshake className="h-5 w-5" />
        </div>
        <div className="min-w-0">
          <h3 className="text-lg font-black uppercase text-white">{t('walletUi.supporters.grantsTitle')}</h3>
          <p className="mt-1 text-sm font-bold text-[#f7931a]">{t('walletUi.supporters.grantsDisclaimer')}</p>
          <p className="mt-1 text-xs leading-relaxed text-gray-400">{t('walletUi.supporters.grantsDisclaimerDesc')}</p>
        </div>
      </div>

      <p className="mt-4 text-[11px] font-bold uppercase tracking-wide text-[#f7931a]">
        {t('walletUi.supporters.grantsRequired')}
      </p>

      <div className="mt-2 grid grid-cols-1 gap-3 sm:grid-cols-2">
        <div className="space-y-1.5">
          <Label htmlFor="grant-org" className="text-gray-200">{t('walletUi.supporters.grantsOrg')} *</Label>
          <Input id="grant-org" value={org} onChange={(e) => setOrg(e.target.value)} placeholder="e.g. OpenSats" className={inputClass} required aria-required="true" />
        </div>
        <div className="space-y-1.5">
          <Label htmlFor="grant-contact" className="text-gray-200">{t('walletUi.supporters.grantsContact')} *</Label>
          <Input id="grant-contact" value={contact} onChange={(e) => setContact(e.target.value)} placeholder="npub / NIP-05 / email / @handle" className={inputClass} required aria-required="true" />
          <p className="text-[10px] leading-relaxed text-gray-500">{t('walletUi.supporters.grantsContactHint')}</p>
        </div>
        <div className="space-y-1.5 sm:col-span-2">
          <Label htmlFor="grant-website" className="text-gray-200">{t('walletUi.supporters.grantsWebsite')}</Label>
          <Input
            id="grant-website"
            type="url"
            value={website}
            onChange={(e) => setWebsite(e.target.value)}
            placeholder="https://…"
            className={inputClass}
            aria-invalid={!!websiteError}
            aria-describedby={websiteError ? 'grant-website-error' : undefined}
          />
          {websiteError && <p id="grant-website-error" role="alert" className="text-[10px] text-red-400">{websiteError}</p>}
        </div>
      </div>

      <div className="mt-4 rounded-xl border border-[#f7931a]/15 bg-black/25 p-3">
        <p className="text-[10px] font-black uppercase tracking-widest text-[#f7931a]">{t('walletUi.supporters.grantsFundTitle')}</p>
        <div className="mt-2 grid grid-cols-1 gap-2 sm:grid-cols-3">
          {PAYS_FOR.slice(0, 3).map(({ icon: Icon, key, desc }) => (
            <div key={key} className="flex items-start gap-2 text-xs text-gray-300">
              <Icon className="mt-0.5 h-3.5 w-3.5 shrink-0 text-[#f7931a]" />
              <div>
                <p className="font-bold text-white">{t(key)}</p>
                <p className="mt-0.5 text-[10px] leading-relaxed text-gray-500">{t(desc)}</p>
              </div>
            </div>
          ))}
        </div>
      </div>

      <label className="mt-4 flex cursor-pointer items-start gap-2.5 rounded-xl border border-[#f7931a]/20 bg-black/30 p-3 text-xs text-gray-300">
        <input
          type="checkbox"
          checked={ack}
          onChange={(e) => setAck(e.target.checked)}
          className="mt-0.5 h-5 w-5 shrink-0 accent-[#f7931a]"
          required
          aria-required="true"
        />
        <span>{t('walletUi.supporters.grantsAck')} *</span>
      </label>

      <details className="group mt-4 rounded-xl border border-white/10 bg-black/25">
        <summary className="flex min-h-11 cursor-pointer list-none items-center gap-2 px-3 py-2 text-xs font-bold text-gray-300">
          <ChevronDown className="h-4 w-4 text-[#f7931a] transition-transform group-open:rotate-180" />
          {t('walletUi.supporters.grantsMoreDetails')}
          <span className="ml-auto text-[10px] font-normal text-gray-500">{t('walletUi.supporters.grantsOptional')}</span>
        </summary>
        <div className="grid grid-cols-1 gap-3 border-t border-white/10 p-3 sm:grid-cols-2">
          <div className="space-y-1.5">
            <Label htmlFor="grant-program" className="text-gray-200">{t('walletUi.supporters.grantsProgram')}</Label>
            <Input id="grant-program" value={program} onChange={(e) => setProgram(e.target.value)} placeholder="e.g. Q1 2027 grants" className={inputClass} />
          </div>
          <div className="space-y-1.5">
            <Label htmlFor="grant-size" className="text-gray-200">{t('walletUi.supporters.grantsSize')}</Label>
            <Input id="grant-size" value={grantSize} onChange={(e) => setGrantSize(e.target.value)} placeholder="e.g. 5–25M sats" className={inputClass} />
          </div>
          <div className="space-y-1.5">
            <Label htmlFor="grant-kyc" className="text-gray-200">{t('walletUi.supporters.grantsKyc')}</Label>
            <Input id="grant-kyc" value={kyc} onChange={(e) => setKyc(e.target.value)} placeholder="e.g. KYB + grantee KYC" className={inputClass} />
          </div>
          <div className="space-y-1.5 sm:col-span-2">
            <Label htmlFor="grant-fund" className="text-gray-200">{t('walletUi.supporters.grantsFund')}</Label>
            <Textarea id="grant-fund" value={fund} onChange={(e) => setFund(e.target.value)} rows={3} placeholder="Relay, app development, translation, design, events…" className={inputClass} />
          </div>
        </div>
      </details>

      <div className="mt-4 grid grid-cols-1 gap-2 sm:grid-cols-3">
        {[
          { icon: ShieldCheck, title: t('walletUi.supporters.grantsNoKycTitle'), body: t('walletUi.supporters.grantsNoKycDesc') },
          { icon: EyeOff, title: t('walletUi.supporters.grantsNoTrackingTitle'), body: t('walletUi.supporters.grantsNoTrackingDesc') },
          { icon: Lock, title: t('walletUi.supporters.grantsPrivateTitle'), body: t('walletUi.supporters.grantsPrivateDesc') },
        ].map(({ icon: Icon, title, body }) => (
          <div key={title} className="flex items-start gap-2 rounded-xl border border-white/10 bg-black/30 p-2.5">
            <Icon className="mt-0.5 h-3.5 w-3.5 shrink-0 text-[#f7931a]" />
            <div className="min-w-0">
              <p className="text-[11px] font-bold text-white">{title}</p>
              <p className="mt-0.5 text-[10px] leading-relaxed text-gray-400">{body}</p>
            </div>
          </div>
        ))}
      </div>

      <p className="mt-3 rounded-xl border border-[#f7931a]/15 bg-[#f7931a]/[0.04] px-3 py-2 text-[11px] leading-relaxed text-gray-400">
        {t('walletUi.supporters.grantsEthos')}
      </p>

      <div className="mt-4 flex flex-col gap-2 sm:flex-row sm:items-center">
        <Button
          type="button"
          disabled={!canSend}
          onClick={() => setReviewOpen(true)}
          className="min-h-11 w-full justify-center bg-[#f7931a] font-bold text-black hover:bg-[#ffb347] disabled:opacity-50 sm:w-auto"
        >
          <Handshake className="mr-2 h-4 w-4" /> {t('walletUi.supporters.grantsReview')}
        </Button>
        <p className="flex items-center gap-1.5 text-[11px] text-gray-400" aria-live="polite">
          <Info className="h-3 w-3 shrink-0" />
          {canSend ? t('walletUi.supporters.grantsNote') : t('walletUi.supporters.grantsRequired')}
        </p>
      </div>

      <Dialog open={reviewOpen} onOpenChange={setReviewOpen}>
        <DialogContent className="max-h-[85dvh] max-w-lg overflow-y-auto border-[#f7931a]/30 bg-zinc-950">
          <DialogHeader>
            <DialogTitle className="text-white">{t('walletUi.supporters.grantsReviewTitle')}</DialogTitle>
            <DialogDescription>{t('walletUi.supporters.grantsReviewDesc')}</DialogDescription>
          </DialogHeader>
          <pre className="max-h-[40dvh] overflow-y-auto whitespace-pre-wrap break-words rounded-xl border border-white/10 bg-black/40 p-3 text-xs leading-relaxed text-gray-300">
            {message}
          </pre>
          <DialogFooter className="flex-col-reverse gap-2 sm:flex-row sm:justify-end">
            <Button variant="outline" onClick={() => setReviewOpen(false)} className="border-white/15">
              {t('common.cancel')}
            </Button>
            <Button variant="outline" onClick={() => void copyMessage()} className="gap-2 border-white/15">
              {copied ? <Check className="h-4 w-4 text-[#ccff00]" /> : <Copy className="h-4 w-4" />}
              {copied ? t('walletUi.supporters.grantsCopied') : t('walletUi.supporters.grantsCopy')}
            </Button>
            <Button onClick={openDm} disabled={!canSend} className="gap-2 bg-[#f7931a] font-bold text-black hover:bg-[#ffb347]">
              <Handshake className="h-4 w-4" /> {t('walletUi.supporters.grantsOpenDm')}
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </div>
  );
}

// ─── Section header ───────────────────────────────────────────────────────────


function SectionHeader({
  icon: Icon,
  title,
  subtitle,
  color = '#ccff00',
}: {
  icon: React.ComponentType<{ className?: string; style?: React.CSSProperties }>;
  title: string;
  subtitle?: string;
  color?: string;
}) {
  return (
    <div className="mb-3 md:mb-4">
      <div className="mb-1.5 flex items-center gap-2.5">
        <Icon className="h-4 w-4 flex-shrink-0" style={{ color }} />
        <h2 className="text-lg font-black uppercase tracking-wide md:text-xl" style={{ color }}>
          {title}
        </h2>
        <div className="h-px flex-1" style={{ background: `linear-gradient(to right, ${color}40, transparent)` }} />
      </div>
      {subtitle && <p className="ml-7 text-xs text-gray-400">{subtitle}</p>}
    </div>
  );
}

// ─── Collaborator card ────────────────────────────────────────────────────────

function CollaboratorCard({ collab }: { collab: Collaborator }) {
  const href = collab.npub
    ? `/${collab.npub}`
    : collab.url;

  const inner = (
    <div className="flex items-center gap-3 p-4 rounded-xl bg-black/60 border border-white/10 hover:border-[#ff0040]/40 transition-all group">
      <div className="relative flex-shrink-0">
        {collab.avatar ? (
          <img
            src={collab.avatar}
            alt={collab.name}
            className="w-12 h-12 rounded-full object-cover border-2 border-white/10 group-hover:border-[#ff0040]/50 transition-all"
          />
        ) : (
          <div className="w-12 h-12 rounded-full bg-gradient-to-br from-[#ff0040]/20 to-[#ff6600]/20 border-2 border-white/10 flex items-center justify-center text-xl">
            🛹
          </div>
        )}
      </div>
      <div className="flex-1 min-w-0">
        <p className="font-bold text-sm text-white truncate">{collab.name}</p>
        <p className="text-xs text-[#ff0040]/80 font-medium">{collab.role}</p>
      </div>
      {href && <ExternalLink className="h-3.5 w-3.5 text-gray-600 group-hover:text-[#ff0040] flex-shrink-0 transition-colors" />}
    </div>
  );

  if (!href) return inner;
  if (collab.npub) return <Link to={`/${collab.npub}`}>{inner}</Link>;
  return <a href={href} target="_blank" rel="noopener noreferrer">{inner}</a>;
}

// ─── Partner card ─────────────────────────────────────────────────────────────

function PartnerCard({ partner }: { partner: Partner }) {
  return (
    <a
      href={partner.url}
      target="_blank"
      rel="noopener noreferrer"
      className="flex items-center gap-3 p-4 rounded-xl bg-black/60 border border-white/10 hover:border-[#ff6600]/50 hover:bg-[#ff6600]/5 transition-all group"
    >
      <div className="w-10 h-10 rounded-lg bg-white/5 border border-white/10 flex items-center justify-center flex-shrink-0 overflow-hidden">
        {partner.logo ? (
          <img
            src={partner.logo}
            alt={partner.name}
            className="w-7 h-7 object-contain brightness-0 invert opacity-70 group-hover:opacity-100 transition-opacity"
            onError={(e) => { (e.target as HTMLImageElement).style.display = 'none'; }}
          />
        ) : (
          <Building2 className="h-5 w-5 text-gray-600 group-hover:text-[#ff6600] transition-colors" />
        )}
      </div>
      <div className="flex-1 min-w-0">
        <p className="font-bold text-sm text-white group-hover:text-[#ff6600] transition-colors">{partner.name}</p>
        <p className="text-xs text-gray-500 truncate">{partner.description}</p>
      </div>
      <ExternalLink className="h-3.5 w-3.5 text-gray-600 group-hover:text-[#ff6600] flex-shrink-0 transition-colors" />
    </a>
  );
}

// ─── Friend card ──────────────────────────────────────────────────────────────

function FriendCard({ friend }: { friend: Friend }) {
  return (
    <a
      href={friend.url}
      target="_blank"
      rel="noopener noreferrer"
      className="flex flex-col items-center gap-3 p-5 rounded-xl bg-black/60 border border-white/10 hover:border-[#ccff00]/40 hover:bg-[#ccff00]/5 transition-all group text-center"
    >
      <div className="w-16 h-16 rounded-2xl bg-white/5 border border-white/10 flex items-center justify-center overflow-hidden group-hover:border-[#ccff00]/40 transition-all">
        {friend.logo ? (
          <img
            src={friend.logo}
            alt={friend.name}
            className={`w-12 h-12 object-contain${friend.invertLogo ? ' invert brightness-200' : ''}`}
            onError={(e) => { (e.target as HTMLImageElement).style.display = 'none'; }}
          />
        ) : (
          <span className="text-2xl">🛹</span>
        )}
      </div>
      <div>
        <p className="font-bold text-sm text-white group-hover:text-[#ccff00] transition-colors">{friend.name}</p>
        {friend.tagline && <p className="text-xs text-gray-500 mt-0.5">{friend.tagline}</p>}
      </div>
    </a>
  );
}

// ─── Supporter types + row (unified: Angor + Lightning) ──────────────────────

interface SupporterEntry {
  key: string;
  pubkey?: string;
  npub?: string;
  name?: string;
  logo?: string;
  url?: string;
  sats: number;
  angorSats: number;
  angor: boolean;
  zap: boolean;
  txid?: string;
  receiptId?: string;
  note?: string;
  anonymous?: boolean;
  at?: number;
}

const TIER_META = {
  supporter: { color: '#22d3ee', key: 'walletUi.supporters.tierSupporter', emoji: '🛹' },
  patron: { color: '#f7931a', key: 'walletUi.supporters.tierPatron', emoji: '🔥' },
  legend: { color: '#facc15', key: 'walletUi.supporters.tierLegend', emoji: '👑💎✨' },
} as const;

const TIER_ORDER = ['legend', 'patron', 'supporter'] as const;
const TIER_RANGE: Record<(typeof TIER_ORDER)[number], string> = {
  legend: '1M+',
  patron: '100k–1M',
  supporter: '< 100k',
};

function MemberAvatar({ entry }: { entry: SupporterEntry }) {
  const { data } = useAuthor(entry.anonymous ? undefined : entry.pubkey);
  const meta = data?.metadata;
  const name = entry.anonymous
    ? '★'
    : entry.name || meta?.display_name || meta?.name || entry.npub || '';
  const avatar = entry.anonymous ? undefined : (entry.logo || meta?.picture);
  return (
    <Avatar className="h-6 w-6 ring-1 ring-white/15" title={name}>
      {avatar && <AvatarImage src={avatar} alt={name} />}
      <AvatarFallback className="text-[10px] font-black text-white/70">
        {entry.anonymous ? '🛹' : name.replace(/[^a-zA-Z0-9]/g, '').charAt(0).toUpperCase() || 'S'}
      </AvatarFallback>
    </Avatar>
  );
}

function TierLadder({ supporters }: { supporters: SupporterEntry[] }) {
  const { t } = useTranslation();
  return (
    <div className="mt-5 grid grid-cols-1 gap-3 sm:grid-cols-3">
      {TIER_ORDER.map((tier) => {
        const meta = TIER_META[tier];
        const members = supporters.filter((s) => tierOf(s.sats) === tier);
        return (
          <div
            key={tier}
            className="rounded-xl border p-3"
            style={{
              borderColor: `${meta.color}55`,
              background: `linear-gradient(135deg, ${meta.color}14, transparent)`,
              boxShadow: tier === 'legend' ? `0 0 18px ${meta.color}33` : undefined,
            }}
          >
            <div className="flex items-center justify-between gap-2">
              <span className="text-sm font-black uppercase tracking-wide" style={{ color: meta.color }}>
                {meta.emoji} {t(meta.key)}
              </span>
              <span className="text-[10px] text-gray-500">{TIER_RANGE[tier]}</span>
            </div>
            {members.length > 0 ? (
              <div className="mt-2 flex flex-wrap items-center gap-1">
                {members.slice(0, 10).map((m) => (
                  <MemberAvatar key={m.key} entry={m} />
                ))}
                {members.length > 10 && (
                  <span className="text-[10px] text-gray-500">+{members.length - 10}</span>
                )}
              </div>
            ) : (
              <p className="mt-2 text-[10px] text-gray-600">{t('walletUi.supporters.tierEmpty')}</p>
            )}
          </div>
        );
      })}
    </div>
  );
}

function SupporterRow({ rank, entry }: { rank: number; entry: SupporterEntry }) {
  const { t } = useTranslation();
  const { data } = useAuthor(entry.anonymous ? undefined : entry.pubkey);
  const meta = data?.metadata;
  const name = entry.anonymous
    ? t('walletUi.supporters.anonymousBacker')
    : entry.name || meta?.display_name || meta?.name
      || (entry.npub ? `${entry.npub.slice(0, 12)}…${entry.npub.slice(-6)}` : t('walletUi.supporters.anonymousBacker'));
  const avatar = entry.anonymous ? undefined : (entry.logo || meta?.picture);
  const tier = TIER_META[tierOf(entry.sats)];
  const when = entry.at ? formatDistanceToNow(new Date(entry.at * 1000), { addSuffix: true }) : undefined;
  const profileHref = !entry.anonymous && entry.npub ? `/${entry.npub}` : undefined;
  const linkHref = profileHref || entry.url;
  const proofUrl = entry.txid
    ? `https://mempool.space/tx/${entry.txid}`
    : entry.receiptId
      ? `https://njump.me/${nip19.neventEncode({ id: entry.receiptId })}`
      : undefined;

  const nameEl = linkHref ? (
    profileHref ? (
      <Link to={linkHref} className="truncate text-sm font-medium text-white transition-colors hover:text-[#22d3ee]">{name}</Link>
    ) : (
      <a href={linkHref} target="_blank" rel="noopener noreferrer" className="truncate text-sm font-medium text-white transition-colors hover:text-[#22d3ee]">{name}</a>
    )
  ) : (
    <span className="truncate text-sm font-medium text-white">{name}</span>
  );

  return (
    <div className="flex items-center gap-3 rounded-xl border border-white/10 bg-black/60 px-3 py-2.5 transition-colors hover:border-[#22d3ee]/50">
      <span className="w-6 shrink-0 text-center text-sm font-bold text-gray-500">#{rank}</span>
      <Avatar className="h-9 w-9 shrink-0">
        {avatar && <AvatarImage src={avatar} alt={name} />}
        <AvatarFallback className="font-black text-[#22d3ee]">
          {entry.anonymous ? '🛹' : name.replace(/[^a-zA-Z0-9]/g, '').charAt(0).toUpperCase() || 'S'}
        </AvatarFallback>
      </Avatar>
      <div className="min-w-0 flex-1">
        <div className="flex min-w-0 items-center gap-2">
          {nameEl}
          {entry.angor && (
            <span className="shrink-0 rounded-full border border-[#22d3ee]/40 px-1.5 py-0.5 text-[9px] font-bold uppercase tracking-wide text-[#22d3ee]">
              {t('walletUi.supporters.sourceAngor')}
            </span>
          )}
          {entry.zap && <Zap className="h-3 w-3 shrink-0 text-[#f7931a]" />}
        </div>
        <div className="mt-0.5 flex items-center gap-2">
          <span
            className="rounded-full px-1.5 py-0.5 text-[9px] font-bold uppercase tracking-wide"
            style={{
              background: `${tier.color}22`,
              color: tier.color,
              border: `1px solid ${tier.color}55`,
              boxShadow: entry.sats >= 1_000_000 ? `0 0 10px ${tier.color}66` : undefined,
            }}
          >
            {tier.emoji} {t(tier.key)}
          </span>
          {entry.note && !entry.anonymous && <span className="text-[11px] text-gray-500">{entry.note}</span>}
          {when && <span className="text-[11px] text-gray-600">· {when}</span>}
        </div>
      </div>
      <div className="flex shrink-0 flex-col items-end gap-0.5">
        <span className="font-bold text-[#ccff00]">
          {entry.sats.toLocaleString()}<span className="ml-0.5 text-[10px] font-medium text-gray-500">sats</span>
        </span>
        {proofUrl && (
          <a
            href={proofUrl}
            target="_blank"
            rel="noopener noreferrer"
            title={entry.txid || entry.receiptId}
            className="inline-flex items-center gap-1 text-[10px] font-bold uppercase tracking-wide text-emerald-400/80 transition-colors hover:text-emerald-300"
          >
            <ShieldCheck className="h-3 w-3" />
            {t('walletUi.supporters.verifiedOnChain')}
          </a>
        )}
      </div>
    </div>
  );
}

// ─── Main page ────────────────────────────────────────────────────────────────

export default function SupportersPage() {
  const { t } = useTranslation();
  const { data: zaps } = useZapLeaderboard(SUPPORTERS_SINCE, PLATFORM_OWNER_PUBKEYS);
  const zappers = useMemo(() => zaps?.senders ?? [], [zaps]);
  const zapTotal = zappers.reduce((sum, z) => sum + z.sats, 0);
  const allSats = BACKERS_TOTAL_SATS + zapTotal;
  const totalUsd = useSatsToUsd(allSats);
  const { data: stats } = useGrowthStats();
  const [showAll, setShowAll] = useState(false);
  const [searchParams, setSearchParams] = useSearchParams();
  const tabParam = searchParams.get('tab');
  const tab: 'support' | 'backers' | 'community' | 'grants' =
    tabParam === 'backers' || tabParam === 'community' || tabParam === 'grants'
      ? tabParam
      : 'support';
  const setTab = (value: 'support' | 'backers' | 'community' | 'grants') => {
    const next = new URLSearchParams(searchParams);
    next.set('tab', value);
    setSearchParams(next, { replace: true });
  };
  const [rail, setRail] = useState<'support-lightning' | 'support-silent' | 'support-angor'>('support-lightning');

  // One ranked wall: Angor backers + Lightning zaps to the project, merged by npub.
  const supporters = useMemo<SupporterEntry[]>(() => {
    const map = new Map<string, SupporterEntry>();
    BACKERS.forEach((b, i) => {
      const npub = b.anonymous ? undefined : b.npub;
      const key = (npub || b.url || b.name || `anon-${i}`).toLowerCase();
      map.set(key, {
        key,
        pubkey: npub ? npubToHex(npub) : undefined,
        npub,
        name: b.anonymous ? undefined : b.name,
        logo: b.anonymous ? undefined : b.logo,
        url: b.url,
        sats: b.amount ?? 0,
        angorSats: b.amount ?? 0,
        angor: true,
        zap: false,
        txid: b.txid,
        note: b.note,
        anonymous: b.anonymous,
        at: b.at,
      });
    });
    for (const z of zappers) {
      const npub = nip19.npubEncode(z.pubkey);
      const existing = map.get(npub);
      if (existing) {
        existing.sats += z.sats;
        existing.zap = true;
        existing.receiptId = z.receiptId;
        if (z.createdAt && (!existing.at || z.createdAt > existing.at)) existing.at = z.createdAt;
      } else {
        map.set(npub, {
          key: npub,
          pubkey: z.pubkey,
          npub,
          sats: z.sats,
          angorSats: 0,
          angor: false,
          zap: true,
          receiptId: z.receiptId,
          at: z.createdAt,
        });
      }
    }
    return [...map.values()].sort((a, b) => b.sats - a.sats);
  }, [zappers]);

  const latestAt = supporters.reduce((m, s) => Math.max(m, s.at ?? 0), 0);

  // `growth-stats` is persisted, so an older cache may lack newer fields — guard every read.
  const num = (v: number | undefined) => v ?? 0;
  const labTotal = stats
    ? num(stats.totalCoaches) + num(stats.totalFilmers) + num(stats.totalEditors) + num(stats.totalPhotographers)
      + num(stats.totalBuilders) + num(stats.totalArtists) + num(stats.totalGraffiti) + num(stats.totalTattoo)
      + num(stats.totalTrainers) + num(stats.totalMusicians) + num(stats.totalJudges) + num(stats.totalOrganizers)
      + num(stats.totalBarbers) + num(stats.totalTransport) + num(stats.totalDesigners)
    : 0;

  const impact = stats
    ? [
        { key: 'walletUi.supporters.impactSpots', value: num(stats.totalSpots) },
        { key: 'walletUi.supporters.impactCrews', value: num(stats.totalCrews) },
        { key: 'walletUi.supporters.impactEvents', value: num(stats.totalEvents) },
        { key: 'walletUi.supporters.impactLab', value: labTotal },
        { key: 'walletUi.supporters.impactShops', value: num(stats.totalShops) },
        { key: 'walletUi.supporters.impactMappers', value: num(stats.totalMappers) },
      ].filter((s) => s.value > 0)
    : [];

  useSeoMeta({
    title: t('seoUi.supportersTitle'),
    description: t('seoUi.supportersDesc'),
    ogTitle: 'Supporters — SkateSpots',
    ogDescription: 'Built by skaters, funded by skaters. Back the map on Angor or zap it.',
    ogImage: 'https://skate-spots.org/images/og-card.png',
  });

  return (
    <>
      <div className="container max-w-4xl space-y-6 px-4 py-8 md:py-10">

        {/* ── Hero ── */}
        <div className="text-center">
          <h1 className="text-4xl font-black uppercase leading-none md:text-5xl">
            <span className="neon-red">{t('walletUi.supporters.our')}</span>{' '}
            <span className="neon-lime">{t('walletUi.supporters.community')}</span>
          </h1>
          <p className="mx-auto mt-2 max-w-xl text-sm text-gray-400">
            {t('walletUi.supporters.heroDesc')}
          </p>
          <div className="mt-5 flex flex-wrap items-center justify-center gap-2">
            <a
              href={ANGOR_PROJECT_URL}
              target="_blank"
              rel="noopener noreferrer"
              className="inline-flex items-center gap-2 rounded-full bg-gradient-to-r from-[#ff0040] to-[#ff6600] px-5 py-2.5 text-xs font-black uppercase text-white shadow-lg shadow-[#ff0040]/25 transition-opacity hover:opacity-90"
            >
              <Zap className="h-4 w-4" />
              {t('walletUi.supporters.backAngor')}
              <ExternalLink className="h-3 w-3 opacity-70" />
            </a>
            <Link
              to="/donate"
              className="inline-flex items-center gap-1.5 rounded-full border border-white/15 px-4 py-2.5 text-xs font-bold text-[#ccff00]/80 transition-colors hover:border-[#ccff00]/40 hover:text-[#ccff00]"
            >
              {t('walletUi.supporters.donatePageLink')} →
            </Link>
          </div>
          <div className="mt-4 flex flex-wrap items-center justify-center gap-x-3 gap-y-1 text-[11px] text-gray-500">
            <span>{supporters.length.toLocaleString()} {t('walletUi.supporters.backers')}</span>
            <span aria-hidden="true">·</span>
            <span>{allSats.toLocaleString()} sats</span>
            {typeof totalUsd === 'number' && (
              <>
                <span aria-hidden="true">·</span>
                <span>≈ ${totalUsd.toFixed(2)}</span>
              </>
            )}
          </div>
        </div>

        {/* ── Compact navigation ── */}
        <Tabs
          value={tab}
          onValueChange={(value) => setTab(value as 'support' | 'backers' | 'community' | 'grants')}
        >
          <TabsList className="grid h-auto w-full grid-cols-4 gap-1 rounded-2xl border border-white/10 bg-black/70 p-1">
            {[
              { value: 'support', label: t('walletUi.supporters.support') },
              { value: 'backers', label: t('walletUi.supporters.backers') },
              { value: 'community', label: t('walletUi.supporters.community') },
              { value: 'grants', label: t('walletUi.supporters.grantsTab') },
            ].map((item) => (
              <TabsTrigger
                key={item.value}
                value={item.value}
                className="h-auto min-h-11 whitespace-normal rounded-xl px-1.5 py-2 text-center text-[10px] font-black uppercase leading-tight tracking-wide data-[state=active]:bg-[#ccff00] data-[state=active]:text-black data-[state=active]:shadow-none sm:px-2 sm:text-[11px]"
              >
                {item.label}
              </TabsTrigger>
            ))}
          </TabsList>

          {/* ── Support rails ── */}
          <TabsContent value="support" className="space-y-4 pt-4">
            <div>
              <h2 className="text-xl font-black uppercase text-white">{t('walletUi.supporters.support')}</h2>
              <p className="mt-0.5 text-sm text-gray-400">{t('walletUi.supporters.donateDesc')}</p>
            </div>
            <WaysToSupport active={rail} onSelect={(id) => setRail(id as typeof rail)} />
            <div id={rail} className="scroll-mt-24">
              {rail === 'support-lightning' && <SupportSkateSpots />}
              {rail === 'support-silent' && <SilentPaymentsCard />}
              {rail === 'support-angor' && <AngorProjectCard count={supporters.length} />}
            </div>

            <section className="pt-1">
              <SectionHeader
                icon={Heart}
                title={t('walletUi.supporters.paysFor')}
                subtitle={t('walletUi.supporters.paysForDesc')}
                color="#22d3ee"
              />
              <div className="grid grid-cols-2 gap-2 sm:grid-cols-3">
                {PAYS_FOR.map(({ icon: Icon, key, desc }) => (
                  <div key={key} className="flex items-start gap-2 rounded-xl border border-white/10 bg-black/60 px-3 py-2">
                    <Icon className="mt-0.5 h-3.5 w-3.5 flex-shrink-0 text-[#22d3ee]" />
                    <div className="min-w-0">
                      <span className="text-xs font-medium text-white">{t(key)}</span>
                      <p className="text-[10px] leading-snug text-gray-500">{t(desc)}</p>
                    </div>
                  </div>
                ))}
              </div>
            </section>
          </TabsContent>

          {/* ── Backers, impact and tiers ── */}
          <TabsContent value="backers" className="space-y-5 pt-4">
            {impact.length > 0 && (
              <section>
                <SectionHeader
                  icon={TrendingUp}
                  title={t('walletUi.supporters.impact')}
                  subtitle={t('walletUi.supporters.impactDesc')}
                  color="#ccff00"
                />
                <div className="grid grid-cols-3 gap-2 sm:grid-cols-6">
                  {impact.map(({ key, value }) => (
                    <div key={key} className="rounded-xl border border-white/10 bg-black/60 px-2 py-2.5 text-center">
                      <div className="text-lg font-black text-[#ccff00]">{value.toLocaleString()}</div>
                      <div className="truncate text-[10px] text-gray-400">{t(key)}</div>
                    </div>
                  ))}
                </div>
                <p className="mt-2 text-center text-[11px] text-gray-500">
                  <Link to="/stats" className="text-[#ccff00]/70 underline underline-offset-2 hover:text-[#ccff00]">
                    {t('walletUi.supporters.impactSeeStats')}
                  </Link>
                  {' · '}
                  {t('walletUi.supporters.impactAsOf')}
                </p>
              </section>
            )}

            <section>
              <SectionHeader
                icon={Zap}
                title={t('walletUi.supporters.backers')}
                subtitle={t('walletUi.supporters.backersDesc')}
                color="#22d3ee"
              />
              {supporters.length > 0 ? (
                <>
                  <div className="flex flex-col gap-1.5">
                    {(showAll ? supporters : supporters.slice(0, VISIBLE_LIMIT)).map((entry, i) => (
                      <SupporterRow key={entry.key} rank={i + 1} entry={entry} />
                    ))}
                  </div>
                  {supporters.length > VISIBLE_LIMIT && (
                    <div className="mt-2 text-center">
                      <button
                        type="button"
                        onClick={() => setShowAll((v) => !v)}
                        className="min-h-0 min-w-0 text-[11px] font-bold uppercase tracking-wide text-[#22d3ee]/80 transition-colors hover:text-[#22d3ee]"
                      >
                        {showAll
                          ? t('walletUi.supporters.showLess')
                          : t('walletUi.supporters.showAll', { count: supporters.length })}
                      </button>
                    </div>
                  )}
                  <p className="mt-3 text-center text-xs text-gray-400">
                    {t('walletUi.supporters.supportersTotals', {
                      count: supporters.length,
                      angor: BACKERS_TOTAL_SATS.toLocaleString(),
                      zap: zapTotal.toLocaleString(),
                    })}
                    {typeof totalUsd === 'number' && <span className="text-gray-500"> · ≈ ${totalUsd.toFixed(2)}</span>}
                  </p>
                  <p className="mt-1 text-center text-[11px] text-gray-600">{t('walletUi.supporters.quietNote')}</p>
                  {latestAt > 0 && (
                    <p className="mt-0.5 text-center text-[10px] text-gray-600">
                      {t('walletUi.supporters.updatedAt', { when: formatDistanceToNow(new Date(latestAt * 1000), { addSuffix: true }) })}
                    </p>
                  )}
                  <TierLadder supporters={supporters} />
                </>
              ) : (
                <div className="rounded-xl border border-dashed border-[#22d3ee]/20 p-6 text-center">
                  <Zap className="mx-auto mb-2 h-8 w-8 text-[#22d3ee]/30" />
                  <p className="mb-1 text-sm text-gray-500">{t('walletUi.supporters.beFirstBacker')}</p>
                  <a href={ANGOR_PROJECT_URL} target="_blank" rel="noopener noreferrer" className="inline-flex items-center gap-1.5 text-xs font-bold text-[#22d3ee]/80 hover:text-[#22d3ee]">
                    <ExternalLink className="h-3 w-3" /> {t('walletUi.supporters.backAngor')}
                  </a>
                </div>
              )}
            </section>
          </TabsContent>

          {/* ── Community, mission, collaborators, partners, friends ── */}
          <TabsContent value="community" className="space-y-6 pt-4">
            <section className="rounded-2xl border border-[#ff0040]/25 bg-black/70 p-5">
              <div className="flex items-center justify-center gap-2">
                <Heart className="h-5 w-5 text-[#ff0040]" />
                <h2 className="text-center text-lg font-black uppercase text-white">
                  {t('walletUi.supporters.whyTitle1')}{' '}
                  <span className="neon-red">{t('walletUi.supporters.whyTitle2')}</span>
                </h2>
              </div>
              <p className="mx-auto mt-2 max-w-2xl text-center text-xs leading-relaxed text-gray-400">
                {t('walletUi.supporters.whyDesc')}
              </p>
              <div className="mt-4 grid grid-cols-1 gap-2 sm:grid-cols-3">
                {[
                  { emoji: '🛹', title: t('walletUi.supporters.why1Title'), desc: t('walletUi.supporters.why1Desc') },
                  { emoji: '⚡', title: t('walletUi.supporters.why2Title'), desc: t('walletUi.supporters.why2Desc') },
                  { emoji: '🌍', title: t('walletUi.supporters.why3Title'), desc: t('walletUi.supporters.why3Desc') },
                ].map(({ emoji, title, desc }) => (
                  <div key={title} className="rounded-xl border border-white/10 bg-white/[0.03] p-3 text-center">
                    <div className="text-2xl">{emoji}</div>
                    <p className="mt-1 text-xs font-bold">{title}</p>
                    <p className="mt-0.5 text-[11px] text-gray-500">{desc}</p>
                  </div>
                ))}
              </div>
            </section>

            <section>
              <SectionHeader
                icon={Users}
                title={t('walletUi.supporters.collaborators')}
                subtitle={t('walletUi.supporters.collaboratorsDesc')}
                color="#ff0040"
              />
              {COLLABORATORS.length > 0 ? (
                <div className="grid grid-cols-1 gap-2 sm:grid-cols-2">
                  {COLLABORATORS.map((c) => <CollaboratorCard key={c.name} collab={c} />)}
                </div>
              ) : (
                <div className="rounded-xl border border-dashed border-[#ff0040]/20 p-5 text-center">
                  <Users className="mx-auto mb-2 h-8 w-8 text-[#ff0040]/30" />
                  <p className="mb-1 text-sm text-gray-500">{t('walletUi.supporters.wantCollaborate')}</p>
                  <p className="mb-3 text-xs text-gray-600">{t('walletUi.supporters.wantCollaborateDesc')}</p>
                  <a href="https://nostrhub.io/naddr1qvzqqqrhnypzqg88e9f588nx7wyz4wt0ura23w3yd4hmztqrkr95utwyvgachjepqyd8wumn8ghj7emfwsh8x6rpddjhxur9v9ex2tnyd9uj7qq22d4kzar92dcx7arnhyhdwn" target="_blank" rel="noopener noreferrer" className="inline-flex items-center gap-1.5 text-xs font-bold text-[#ff0040]/70 hover:text-[#ff0040]">
                    <ExternalLink className="h-3 w-3" /> {t('walletUi.supporters.viewNostrHub')}
                  </a>
                </div>
              )}
            </section>

            <section>
              <SectionHeader icon={Handshake} title={t('walletUi.supporters.partners')} subtitle={t('walletUi.supporters.partnersDesc')} color="#ff6600" />
              {PARTNERS.length > 0 ? (
                <div className="grid grid-cols-1 gap-2 sm:grid-cols-2">
                  {PARTNERS.map((p) => <PartnerCard key={p.name} partner={p} />)}
                </div>
              ) : (
                <div className="rounded-xl border border-dashed border-[#ff6600]/20 p-5 text-center text-sm text-gray-500">
                  {t('walletUi.supporters.wantPartner')}
                </div>
              )}
            </section>

            <section>
              <SectionHeader icon={Star} title={t('walletUi.supporters.friends')} subtitle={t('walletUi.supporters.friendsDesc')} color="#ccff00" />
              <div className="grid grid-cols-2 gap-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-5">
                {FRIENDS.map((f) => <FriendCard key={f.name} friend={f} />)}
              </div>
              <div className="mt-3 rounded-xl border border-dashed border-[#ccff00]/20 p-4 text-center">
                <p className="text-xs text-gray-500">{t('walletUi.supporters.wantListed')}</p>
                <p className="mt-0.5 text-[11px] text-gray-600">{t('walletUi.supporters.wantListedDesc')}</p>
              </div>
            </section>
          </TabsContent>

          {/* ── Grantmakers ── */}
          <TabsContent value="grants" className="space-y-4 pt-4">
            <SectionHeader
              icon={Handshake}
              title={t('walletUi.supporters.grantsSection')}
              subtitle={t('walletUi.supporters.grantsSectionDesc')}
              color="#f7931a"
            />
            <GrantmakerForm />
          </TabsContent>
        </Tabs>

        {/* ── Footer ── */}
        <div className="border-t border-gray-800 pt-5 text-center text-xs text-gray-500">
          <p>{t('walletUi.supporters.thankYou')}</p>
          <p className="mt-1.5">
            <Link to="/license" className="text-[#ccff00]/70 underline transition-colors hover:text-[#ccff00]">{t('walletUi.supporters.license')}</Link>
            {' '}&middot;{' '}
            <Link to="/about" className="text-[#ccff00]/70 underline transition-colors hover:text-[#ccff00]">{t('nav.about')}</Link>
            {' '}&middot;{' '}
            <Link to="/faq" className="text-[#ccff00]/70 underline transition-colors hover:text-[#ccff00]">{t('walletUi.supporters.faq')}</Link>
          </p>
        </div>

      </div>
    </>
  );
}