import { useState } from 'react';
import { useSeoMeta } from '@unhead/react';
import { Link } from 'react-router-dom';
import { PageHeader } from '@/components/PageHeader';
import { WalletModal } from '@/components/WalletModal';
import { Badge } from '@/components/ui/badge';
import { useWallet } from '@/hooks/useWallet';
import { useNWC } from '@/hooks/useNWCContext';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useCashu } from '@/hooks/wallet/useCashu';
import { useTranslation } from '@/contexts/language';
import { LoginArea } from '@/components/auth/LoginArea';
import { CashuWalletCard } from '@/components/wallet/CashuWalletCard';
import { EscrowKeyCard } from '@/components/wallet/EscrowKeyCard';
import { EscrowSettingsCard } from '@/components/wallet/EscrowSettingsCard';
import { NwcWalletCard } from '@/components/wallet/NwcWalletCard';
import { cn } from '@/lib/utils';
import {
  Zap,
  Settings,
  CheckCircle,
  XCircle,
  Globe,
  WalletMinimal,
  Nut,
  ChevronRight,
  ExternalLink,
  ChevronDown,
  ChevronUp,
  Wallet,
  Coins,
} from 'lucide-react';

// ─── Wallet status bar ────────────────────────────────────────────────────────

function WalletStatusBar() {
  const { t } = useTranslation();
  const { webln } = useWallet();
  const { connections } = useNWC();
  const { isInitialized: hasCashu } = useCashu();
  const hasNWC = connections.length > 0 && connections.some((c) => c.isConnected);
  const isReady = webln || hasNWC || hasCashu;

  return (
    <div className="flex flex-wrap items-center gap-2">
      {/* Status pills */}
      <div className="flex min-w-0 flex-wrap items-center gap-1.5">
        <StatusPill icon={Nut} label="Cashu" active={hasCashu} color="text-orange-400" activeBg="bg-orange-500/20 border-orange-500/30" />
        <StatusPill icon={Globe} label="WebLN" active={!!webln} color="text-blue-400" activeBg="bg-blue-500/20 border-blue-500/30" />
        <StatusPill icon={WalletMinimal} label="NWC" active={hasNWC} color="text-purple-400" activeBg="bg-purple-500/20 border-purple-500/30" />
      </div>

      {/* Manage wallets */}
      <WalletModal>
        <button className="ml-auto flex items-center gap-1.5 px-3 py-1.5 rounded-xl bg-white/5 hover:bg-white/10 border border-white/8 active:scale-95 transition-all flex-shrink-0">
          <Settings className="h-3.5 w-3.5 text-orange-400" />
          <span className="text-xs font-bold text-white">{t('walletUi.page.manage')}</span>
          {isReady
            ? <Badge className="bg-green-500/20 text-green-400 border-green-500/30 text-[9px] px-1 py-0 leading-none">ON</Badge>
            : <ChevronRight className="h-3 w-3 text-muted-foreground" />
          }
        </button>
      </WalletModal>
    </div>
  );
}

function StatusPill({
  icon: Icon, label, active, color, activeBg,
}: {
  icon: React.ComponentType<{ className?: string }>;
  label: string;
  active: boolean;
  color: string;
  activeBg: string;
}) {
  return (
    <div className={cn(
      'flex items-center gap-1 px-2 py-1 rounded-full border text-[10px] font-bold transition-all',
      active ? `${activeBg} ${color}` : 'bg-white/3 border-white/8 text-gray-400'
    )}>
      <Icon className="h-2.5 w-2.5" />
      {label}
      {active
        ? <CheckCircle className="h-2.5 w-2.5 text-green-500" />
        : <XCircle className="h-2.5 w-2.5 text-gray-700" />
      }
    </div>
  );
}

// ─── Get a wallet (collapsible) ───────────────────────────────────────────────

function GetAWallet() {
  const { t } = useTranslation();
  const [open, setOpen] = useState(false);

  const wallets = [
    { name: 'Minibits', desc: t('walletUi.page.walletMinibits'), url: 'https://www.minibits.cash', color: 'text-orange-400' },
    { name: 'Alby', desc: t('walletUi.page.walletAlby'), url: 'https://getalby.com', color: 'text-yellow-400' },
    { name: 'Zeus', desc: t('walletUi.page.walletZeus'), url: 'https://zeusln.com', color: 'text-blue-400' },
    { name: 'Coinos', desc: t('walletUi.page.walletCoinos'), url: 'https://coinos.io', color: 'text-green-400' },
  ];

  return (
    <div className="rounded-2xl border border-white/8 overflow-hidden">
      <button
        onClick={() => setOpen((v) => !v)}
        className="w-full flex items-center justify-between px-4 py-3.5 bg-white/3 hover:bg-white/5 transition-all"
      >
        <div className="flex items-center gap-2">
          <Zap className="h-4 w-4 text-yellow-400" />
          <span className="text-sm font-black uppercase tracking-wide text-white">{t('walletUi.page.getAWallet')}</span>
        </div>
        {open
          ? <ChevronUp className="h-4 w-4 text-muted-foreground" />
          : <ChevronDown className="h-4 w-4 text-muted-foreground" />
        }
      </button>

      {open && (
        <div className="divide-y divide-white/5">
          {wallets.map((w) => (
            <a
              key={w.name}
              href={w.url}
              target="_blank"
              rel="noopener noreferrer"
              className="flex items-center justify-between px-4 py-3 hover:bg-white/5 active:scale-[0.99] transition-all"
            >
              <div className="min-w-0">
                <p className={cn('font-bold text-sm', w.color)}>{w.name}</p>
                <p className="text-xs text-muted-foreground">{w.desc}</p>
              </div>
              <ExternalLink className="h-3.5 w-3.5 text-muted-foreground flex-shrink-0" />
            </a>
          ))}
          <div className="px-4 py-3">
            <a
              href="https://planb.academy/en/tutorials/wallet"
              target="_blank"
              rel="noopener noreferrer"
              className="text-xs text-orange-400 hover:text-orange-300 transition-colors flex items-center gap-1.5"
            >
              <ExternalLink className="h-3 w-3" />
              {t('walletUi.page.learnPlanB')}
            </a>
          </div>
        </div>
      )}
    </div>
  );
}

// ─── What are zaps (collapsible, hidden once wallet connected) ────────────────

function WhatAreZaps({ walletConnected }: { walletConnected: boolean }) {
  const { t } = useTranslation();
  const [open, setOpen] = useState(!walletConnected);

  if (walletConnected && !open) {
    return (
      <button
        onClick={() => setOpen(true)}
        className="text-xs text-muted-foreground/40 hover:text-muted-foreground transition-colors flex items-center gap-1 mx-auto"
      >
        <ChevronDown className="h-3 w-3" />
        {t('walletUi.page.whatAreZapsShort')}
      </button>
    );
  }

  return (
    <div className="rounded-2xl border border-white/8 overflow-hidden">
      <button
        onClick={() => setOpen((v) => !v)}
        className="w-full flex items-center justify-between px-4 py-3.5 bg-white/3 hover:bg-white/5 transition-all"
      >
        <div className="flex items-center gap-2">
          <Zap className="h-4 w-4 text-amber-500" />
          <span className="text-sm font-black uppercase tracking-wide text-white">{t('walletUi.page.whatAreZaps')}</span>
        </div>
        {open
          ? <ChevronUp className="h-4 w-4 text-muted-foreground" />
          : <ChevronDown className="h-4 w-4 text-muted-foreground" />
        }
      </button>

      {open && (
        <div className="px-4 pb-4 pt-3 space-y-3">
          <p className="text-sm text-muted-foreground leading-relaxed">
            {t('walletUi.page.zapsDesc')}
          </p>
          <div className="grid grid-cols-2 gap-2">
            {[
              { emoji: '⚡', title: t('walletUi.page.instant'), desc: t('walletUi.page.instantDesc') },
              { emoji: '🔐', title: t('walletUi.page.flexible'), desc: t('walletUi.page.flexibleDesc') },
              { emoji: '🥜', title: t('walletUi.page.private'), desc: t('walletUi.page.privateDesc') },
              { emoji: '💜', title: t('walletUi.page.direct'), desc: t('walletUi.page.directDesc') },
            ].map((item) => (
              <div key={item.title} className="flex items-start gap-2 p-2.5 bg-white/3 rounded-xl">
                <span className="text-base flex-shrink-0">{item.emoji}</span>
                <div>
                  <p className="font-bold text-xs text-white">{item.title}</p>
                  <p className="text-[11px] text-muted-foreground">{item.desc}</p>
                </div>
              </div>
            ))}
          </div>
        </div>
      )}
    </div>
  );
}

// ─── Not logged in ────────────────────────────────────────────────────────────

function NotLoggedIn() {
  const { t } = useTranslation();
  return (
    <div className="flex flex-col items-center justify-center py-20 px-4 text-center">
      <div className="w-16 h-16 rounded-2xl bg-orange-500/10 flex items-center justify-center mb-4">
        <Wallet className="h-8 w-8 text-orange-500/60" />
      </div>
      <h3 className="text-lg font-black mb-2 text-white">{t('walletUi.page.loginRequired')}</h3>
      <p className="text-muted-foreground text-sm max-w-xs mb-6 leading-relaxed">
        {t('walletUi.page.loginRequiredDesc')}
      </p>
      <LoginArea className="justify-center" />
    </div>
  );
}

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

export default function WalletPage() {
  const { t } = useTranslation();
  useSeoMeta({
    title: t('seoUi.walletTitle'),
    description: t('seoUi.walletDesc'),
  });

  const { user } = useCurrentUser();
  const { webln } = useWallet();
  const { connections } = useNWC();
  const { isInitialized: hasCashu } = useCashu();
  const hasNWC = connections.length > 0 && connections.some((c) => c.isConnected);
  const walletConnected = !!(webln || hasNWC || hasCashu);

  return (
    <>
      <div className="container px-4 py-5 max-w-lg mx-auto">

        <PageHeader title={t('walletUi.page.title')} accent="#ff6600" subtitle={t('walletUi.page.subtitle')} />

        {user ? (
          <div className="space-y-4">
            {/* Status bar + manage — compact single row */}
            <WalletStatusBar />

            {/* Connected Lightning wallet (NIP-47) — balance / receive / send */}
            <NwcWalletCard />

            {/* Cashu wallet — native app, self-custodial ecash */}
            <CashuWalletCard />
            <EscrowKeyCard />
            <EscrowSettingsCard />

            <Link
              to="/mints"
              className="flex items-center justify-between gap-3 rounded-2xl border border-white/10 bg-white/[0.03] px-4 py-3 transition-colors hover:bg-white/[0.06]"
            >
              <span className="flex items-center gap-2 text-sm font-medium text-white">
                <Coins className="h-4 w-4 text-[#ccff00]" /> {t('walletUi.page.browseMints')}
              </span>
              <ChevronRight className="h-4 w-4 text-gray-500" />
            </Link>

            {/* Get a wallet — collapsed by default */}
            <GetAWallet />

            {/* What are zaps — auto-collapses once wallet connected */}
            <WhatAreZaps walletConnected={walletConnected} />
          </div>
        ) : (
          <NotLoggedIn />
        )}
      </div>
    </>
  );
}