import { useEffect, useRef, useState } from 'react';
import { ArrowDownLeft, ArrowLeftRight, ArrowRight, ArrowUpRight, BookOpen, Check, ChevronRight, CircleHelp,
  Copy, Cpu, Download, ExternalLink, Globe2, Layers3, LayoutDashboard, LoaderCircle,
  Pickaxe, Search, Shield, ShoppingBag, Sparkles, Wallet as WalletIcon, X } from 'lucide-react';
import { rarity } from '../shared/protocol.ts';
import { CONSENSUS, NETWORK, isNftTrade, nftTransferMessage, testnetOwnerOf, transactionCardIds,
  type TestnetBlock, type TestnetSnapshot } from '../shared/testnet.ts';
import { getWallet, sign, subscribeWallet, watchWalletLifecycle, type Wallet } from './wallet.ts';
import { Card, samples, imageCredit, type CardData } from './Card.tsx';
import { WalletPanel } from './WalletPanel.tsx';
import { useModalFocus } from './useModalFocus.ts';
import { ThemePicker } from './ThemePicker.tsx';
import { TradeDesk } from './TradeDesk.tsx';
import { Marketplace } from './Marketplace.tsx';
import { IS_MAINNET, NETWORK_LABEL } from '../shared/network.ts';
import { StateClient } from '../shared/rpc-client.ts';
import './App.css';
import './testnet.css';

type View = 'Discover' | 'My collection' | 'Block explorer' | 'Trade decks' | 'Marketplace';
const short = (s: string) => s ? `${s.slice(0, 6)}…${s.slice(-4)}` : '—';
const asCard = (block: TestnetBlock): CardData => ({ article: block.article, hash: block.powHash, block });
const message = (error: unknown) => error instanceof Error ? error.message : 'Request failed. Please try again.';
async function request<T>(path: string, body?: unknown, expectedStatus?: number): Promise<T> {
  const res = await fetch(`/api/${path}`, { cache: 'no-store', signal: AbortSignal.timeout(15000),
    ...(body === undefined ? {} : { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body) }) });
  if (!res.headers.get('content-type')?.includes('application/json')) throw new Error('The testnet RPC is unavailable. Start the node and web services.');
  const data = await res.json();
  if (!res.ok) throw new Error(typeof data.error === 'string' ? data.error : 'Request failed');
  if (expectedStatus !== undefined && res.status !== expectedStatus) throw new Error('Unexpected testnet RPC response. Refresh before trying again.');
  return data;
}

// Only canonical, mined transfers determine ownership and the next signature sequence.
function transferProblem(state: TestnetSnapshot, card: CardData, address: string): string {
  const mint = card.block;
  const block = mint && state.blocks.find(b => b.tokenId === mint.tokenId && b.hash === mint.hash);
  if (!block) return 'This NFT is no longer on the canonical chain. Refresh your collection.';
  if (testnetOwnerOf(state, block.tokenId) !== address) return 'This wallet is not the confirmed owner.';
  if (state.blocks.length + 1 - block.height < CONSENSUS.coinbaseMaturity)
    return 'Immature NFT: transfers require two subsequent blocks at the next inclusion height.';
  if (state.pendingTransfers.some(tx => transactionCardIds(tx).includes(block.tokenId))) return 'A transfer or trade involving this NFT is already pending mining.';
  return '';
}

export default function App() {
  const [view, setView] = useState<View>('Discover');
  const [wallet, setWallet] = useState<Wallet>();
  const [snapshot, setSnapshot] = useState<TestnetSnapshot>();
  const [rpcAvailable, setRpcAvailable] = useState(false);
  const [error, setError] = useState('');
  const [toast, setToast] = useState('');
  const [dialog, setDialog] = useState<'guide' | 'wallet' | 'transfer' | null>(null);
  const [selected, setSelected] = useState<CardData>();
  const [query, setQuery] = useState('');
  const [category, setCategory] = useState('All cards');
  const [recipient, setRecipient] = useState('');
  const [transferBusy, setTransferBusy] = useState(false);
  const [transferError, setTransferError] = useState('');
  const transferInFlight = useRef(false);
  const refreshVersion = useRef(0);
  const minerPanel = useRef<HTMLElement>(null);
  const stateClient = useRef(new StateClient());
  useModalFocus(Boolean(dialog || selected));

  const refresh = async () => {
    const version = ++refreshVersion.current;
    try {
      const data = await stateClient.current.load();
      if (data.network !== NETWORK || data.algorithm !== 'RandomX' || typeof data.chainId !== 'string' ||
          !Array.isArray(data.blocks) || !Array.isArray(data.transfers) || !Array.isArray(data.pendingTransfers))
        throw new Error('Incompatible node. This interface requires the Wikideck RandomX testnet API.');
      if (version === refreshVersion.current) { setSnapshot(data); setRpcAvailable(true); setError(''); }
      return data;
    } catch (e) {
      if (version === refreshVersion.current) { setRpcAvailable(false); setError(message(e)); }
      throw e;
    }
  };
  useEffect(() => {
    let active = true;
    const stopLifecycle = watchWalletLifecycle();
    const unsubscribe = subscribeWallet(() => {
      void getWallet().then(value => { if(active) {setWallet(value);setRecipient('');setTransferError('');} }).catch(()=>{if(active)setWallet(undefined);});
    });
    getWallet().then(value => { if (active) setWallet(value); }).catch(e => { if (active) setError(message(e)); });
    void refresh().catch(() => {});
    const timer = setInterval(() => { void refresh().catch(() => {}); }, 8000);
    return () => { active = false; unsubscribe(); stopLifecycle(); clearInterval(timer); refreshVersion.current++; };
  }, []);
  useEffect(() => {
    if (toast) { const timer = setTimeout(() => setToast(''), 8000); return () => clearTimeout(timer); }
  }, [toast]);
  useEffect(() => {
    const escape = (event: KeyboardEvent) => {
      if (event.key === 'Escape' && !transferInFlight.current) { setDialog(null); setSelected(undefined); setTransferError(''); }
    };
    document.addEventListener('keydown', escape);
    return () => document.removeEventListener('keydown', escape);
  }, []);

  const transfer = async () => {
    if (transferInFlight.current || !wallet || !selected?.block || !snapshot) return;
    transferInFlight.current = true; setTransferBusy(true); setTransferError('');
    try {
      const state = await refresh();
      if (state.chainId !== snapshot.chainId) throw new Error('The node chain ID changed. Refresh and review this NFT before signing.');
      const problem = transferProblem(state, selected, wallet.address);
      if (problem) throw new Error(problem);
      const to = recipient.trim().toLowerCase();
      if (!/^[a-f0-9]{64}$/.test(to) || to === wallet.address) throw new Error('Enter another wallet’s 64-character receive address.');
      const tokenId = selected.block.tokenId;
      const t = { network: NETWORK, chainId: state.chainId, cardHash: tokenId,
        from: wallet.address, to, sequence: state.transfers.filter(tx => transactionCardIds(tx).includes(tokenId)).length };
      const tx = { ...t, publicKey: wallet.publicKey, signature: await sign(wallet, nftTransferMessage(t)) };
      await request('transfer', tx, 202);
      // A 202 is a mempool acknowledgement, NOT a change of confirmed ownership.
      refreshVersion.current++;
      setSnapshot(current => current && current.chainId === state.chainId ? { ...current,
        pendingTransfers: [...current.pendingTransfers.filter(p => !transactionCardIds(p).includes(tx.cardHash)), tx] } : current);
      setDialog(null); setRecipient('');
      setToast('Transfer pending. You remain the confirmed owner until it is mined into the canonical chain.');
      void refresh().catch(() => {});
    } catch (e) { setTransferError(message(e)); }
    finally { transferInFlight.current = false; setTransferBusy(false); }
  };
  const owned = snapshot?.blocks.filter(b => wallet && testnetOwnerOf(snapshot, b.tokenId) === wallet.address) ?? [];
  const visibleCards = view === 'My collection' ? owned.map(asCard)
    : snapshot?.blocks.length ? [...snapshot.blocks].reverse().slice(0, 12).map(asCard) : samples;
  const filtered = visibleCards.filter(c => (category === 'All cards' || c.article.category === category) &&
    `${c.article.title} ${c.article.extract}`.toLowerCase().includes(query.toLowerCase()));
  const selectedMint = selected?.block;
  const selectedBlock = selectedMint && snapshot?.blocks.find(b => b.tokenId === selectedMint.tokenId && b.hash === selectedMint.hash);
  const confirmations = selectedBlock && snapshot ? snapshot.blocks.length - selectedBlock.height + 1 : 0;
  const selectedOwner = selectedBlock && snapshot ? testnetOwnerOf(snapshot, selectedBlock.tokenId) : undefined;
  const pending = !!selectedBlock && !!snapshot?.pendingTransfers.some(tx => transactionCardIds(tx).includes(selectedBlock.tokenId));
  const transferDisabledReason = selected && wallet && snapshot ? transferProblem(snapshot, selected, wallet.address) : 'Wallet and node state are required.';
  const peerLabel = !rpcAvailable ? 'Peers unknown' : snapshot?.peers ? `${snapshot.peers} peers` : 'Isolated node';
  const nativeCommand = `npm run miner -- --wallet <backup.json> --consent --node ${window.location.origin}`;
  const close = () => { if (!transferInFlight.current) { setDialog(null); setSelected(undefined); setTransferError(''); } };
  const openWallet = () => { setSelected(undefined); setDialog('wallet'); };
  const goMine = () => {
    setView('Discover');
    setTimeout(() => minerPanel.current?.scrollIntoView({ behavior: window.matchMedia('(prefers-reduced-motion: reduce)').matches ? 'auto' : 'smooth', block: 'center' }), 50);
  };
  const copyAddress = async () => {
    if (!wallet) return;
    try { await navigator.clipboard.writeText(wallet.address); setToast('Wallet address copied.'); }
    catch { setToast('Clipboard unavailable. Select and copy your receive address below.'); }
  };
  const updateWallet = (restored: Wallet) => {
    setWallet(restored); setSelected(undefined); setRecipient(''); setTransferError('');
    setToast('Wallet restored locally. Refreshing confirmed NFT ownership.');
    void refresh().catch(() => {});
  };
  const retry = async () => {
    try { setWallet(await getWallet()); await refresh(); }
    catch (e) { setError(message(e)); }
  };

  return <div className="app-shell">
    <aside className="sidebar">
      <a href="#" className="brand" onClick={e => { e.preventDefault(); setView('Discover'); }}><span className="brand-mark" aria-hidden="true">W<span>✦</span></span>wikideck<span className="brand-dot">.</span></a>
      <div className="sidebar-label">YOUR NEXT DISCOVERY</div>
      <nav aria-label="Main navigation">{(['Discover', 'My collection', 'Block explorer', 'Trade decks', 'Marketplace'] as View[]).map((item, i) => {
        const Icon = [LayoutDashboard, Layers3, Globe2, ArrowLeftRight, ShoppingBag][i];
        return <button key={item} aria-label={item} aria-current={view === item ? 'page' : undefined} className={`nav-item ${view === item ? 'active' : ''}`} onClick={() => { setView(item); setQuery(''); setCategory('All cards'); }}><Icon size={18} />{item}{item === 'My collection' && <span className="nav-count">{owned.length}</span>}</button>;
      })}</nav>
      <div className="sidebar-note"><span className="tiny-spark">✦</span><h3>Your cards.<br />Your community.</h3><p>Mine Wikipedia NFT cards, build collections, and trade in peer-hosted markets.</p><button onClick={() => setDialog('guide')}>How it works <ArrowUpRight size={15} /></button></div>
      <div className="sidebar-bottom"><span className={`network-dot ${!rpcAvailable || !snapshot?.peers ? 'disconnected' : ''}`} /><span>{peerLabel}</span><span className="prototype">{NETWORK_LABEL}</span></div>
      <button className="help-link" onClick={() => setDialog('guide')}><CircleHelp size={16} /> The field guide <ArrowUpRight size={14} /></button>
    </aside>
    <div className="main-shell">
      <header className="topbar"><div className="breadcrumbs">Explore <ChevronRight size={13} /><span>{view}</span></div><div className="top-actions"><span className="testnet-brand">RandomX <b>{NETWORK_LABEL}</b></span><ThemePicker /><span className="network-pill"><span className={`network-dot ${!rpcAvailable || !snapshot?.peers ? 'disconnected' : ''}`} />{peerLabel}</span><button className="wallet-button" onClick={openWallet}><span className="wallet-avatar"><WalletIcon size={14} /></span>{wallet ? short(wallet.address) : 'Open wallet'}<ChevronRight size={14} /></button></div></header>
      <main>
        <div className="testnet-status" role="status"><span><span className={`network-dot ${rpcAvailable ? '' : 'disconnected'}`} /> RPC {rpcAvailable ? 'available' : 'unavailable'}</span><span>{peerLabel}</span><span>{IS_MAINNET?'Gated mainnet candidate · unaudited · mock payments only':'Unbootstrapped testnet · no public mainnet'}</span>{snapshot && !rpcAvailable && <strong>Showing last known state</strong>}</div>
        {error && <div className="error-banner" role="alert"><CircleHelp size={17} /><span>{error}</span><button onClick={retry}>Retry</button><button aria-label="Dismiss error" onClick={() => setError('')}><X size={16} /></button></div>}
        {view === 'Discover' && <>
          <section className="hero">
            <div className="hero-copy"><span className="eyebrow"><span /> WIKIPEDIA CARDS. THEIR OWN NFT BLOCKCHAIN.</span><h1>Mine knowledge.<br />Collect the <span>extraordinary.</span></h1><p>Mine a block. Earn a Wikipedia NFT card. Build collections, trade discoveries, and find your community in peer-hosted markets. Trading card games are next on the roadmap.</p><div className="hero-actions"><button className="button dark" onClick={goMine}><Pickaxe size={17} /> Start collecting <ArrowUpRight size={17} /></button><button className="text-button" onClick={() => setDialog('guide')}>How it works <ArrowRight size={16} /></button></div><div className="hero-foot"><span><Check size={13} /> Consumer-CPU mining</span><span><Check size={13} /> Peer-hosted markets</span></div></div>
            <div className="hero-visual"><div className="orbit orbit-one" /><div className="orbit orbit-two" /><span className="orbit-spark spark-one">✳</span><span className="orbit-spark spark-two">+</span><div className="floating-label label-top"><Sparkles size={12} /> Preview cards · not owned</div><div className="hero-card back-card"><Card card={samples[2]} onClick={() => setSelected(samples[2])} /></div><div className="hero-card front-card"><Card card={samples[0]} onClick={() => setSelected(samples[0])} /></div><div className="floating-label label-bottom"><Sparkles size={15} /> A world worth collecting <ArrowUpRight size={13} /></div></div>
          </section>
          <section className="metrics" aria-label="Canonical chain statistics">
            <div><span className="metric-icon"><Layers3 size={19} /></span><div><span>Native NFTs minted</span><strong>{snapshot?.blocks.length.toLocaleString() ?? '—'}<small>canonical chain</small></strong></div></div>
            <div><span className="metric-icon"><Globe2 size={19} /></span><div><span>Block height</span><strong>{snapshot ? `#${snapshot.blocks.at(-1)?.height ?? 0}` : '—'}<small>current tip</small></strong></div></div>
            <div><span className="metric-icon"><WalletIcon size={19} /></span><div><span>Confirmed ownership</span><strong>{wallet && snapshot ? owned.length : '—'}<small>in your wallet</small></strong></div></div>
            <div><span className="metric-icon"><Cpu size={19} /></span><div><span>Proof of work</span><strong className="algorithm">{snapshot?.algorithm ?? 'RandomX'}<small>native CPU mining</small></strong></div></div>
          </section>
          <section className="mining-panel native-mining" ref={minerPanel}>
            <div className="mining-description"><div className="section-eyebrow"><span className="idle-dot" /> RANDOMX · BUILT FOR GENERAL-PURPOSE CPUS</div><h2>Mine blocks. Earn cards.</h2><p>Wikideck uses RandomX, the proof-of-work algorithm also used by Monero, to keep mining competitive on consumer-grade CPUs. Each accepted block rewards its miner with an illustrated Wikipedia NFT card. Results depend on your hardware and network difficulty; Wikideck does not share Monero’s network security.</p><div className="mining-meta"><span><Cpu size={13} /> Consumer hardware</span><span><Shield size={13} /> Independent validating peers</span></div><div className="native-memory"><strong>Light · default</strong><span>256 MiB cache + scratchpad and overhead.</span><strong>Fast · --fast</strong><span>~2 GiB dataset plus cache; budget over 2.3 GiB per process. Mining consumes CPU, memory and energy; RandomX is not a guarantee of ASIC resistance or profitability.</span></div></div>
            <div className="miner-controls"><div className="miner-display"><div><span>NEXT WIKIPEDIA ARTICLE</span><strong>{snapshot ? 'Chosen when the miner requests work' : 'Waiting for testnet RPC…'}</strong></div></div><p className="muted">Each mining template requests a random English Wikipedia article with a Wikimedia picture. Pages may repeat; every minted card carries its own statistics snapshot.</p><ol className="native-steps"><li>Build <code>wikideck-randomx</code> using the repository’s native build instructions.</li><li>Save your encrypted backup and keep its password separate.</li><li>Replace <code>&lt;backup.json&gt;</code> with your local file path (quote paths with spaces), then run:</li></ol><pre className="native-command"><code>{nativeCommand}</code></pre><p className="miner-footnote">Node: {window.location.origin}. Same-origin RPC, including the development proxy. Use HTTPS for remote nodes. Password entry stays local; never put it in the command. Defaults to one worker and at most one block. Ctrl+C stops the native miner; closing this page does not.</p><button className="button dark full" onClick={openWallet}><Download size={16} /> Download wallet backup</button><button className="text-button" onClick={() => setDialog('guide')}>Read the testnet field guide <ArrowRight size={14} /></button></div>
          </section>
          <section className="project-pillars" aria-label="Collect, host, and play">
            <article><Layers3 size={22}/><div className="section-eyebrow">COLLECT & TRADE</div><h2>A collection with a story.</h2><p>Collect Wikipedia pages as cards, swap multiple cards in one trade, or list discoveries at a fixed price or timed auction.</p><button className="text-button" onClick={()=>setView('Trade decks')}>Trade cards <ArrowRight size={14}/></button></article>
            <article><Globe2 size={22}/><div className="section-eyebrow">HOST YOUR OWN MARKET</div><h2>Your peer. Your community.</h2><p>Run a peer and host a market for everyone or a community centered on a collection. Sales allocate a hosting fee to the operator and a hardcoded 1% to the project author. Cryptocurrency checkout is designed for XMR; today payments and fees are simulated.</p><button className="text-button" onClick={()=>setView('Marketplace')}>Explore this peer’s market <ArrowRight size={14}/></button></article>
            <article><Sparkles size={22}/><div className="section-eyebrow">ON THE ROADMAP · NOT PLAYABLE YET</div><h2>Cards made for more.</h2><p>Trading card games and peer-hosted custom TCGs are planned. The open-source direction is to let communities adapt markets and games; a software license still needs to be published. Built-in collection curation and custom game hosting are not available yet.</p><button className="text-button" onClick={()=>setDialog('guide')}>The project vision <ArrowRight size={14}/></button></article>
          </section>
        </>}
        {view === 'Marketplace' ? <Marketplace wallet={wallet} snapshot={snapshot} rpcAvailable={rpcAvailable} onNotice={setToast} /> : view === 'Trade decks' ? <TradeDesk wallet={wallet} snapshot={snapshot} rpcAvailable={rpcAvailable} onNotice={setToast} /> : view !== 'Block explorer' ? <section className="discover-section">
          <div className="section-heading"><div><div className="section-eyebrow">{view === 'My collection' ? 'YOUR PERSONAL ENCYCLOPEDIA' : 'AN ENCYCLOPEDIA, REIMAGINED'}</div><h2>{view === 'My collection' ? 'Your cabinet of curiosities' : 'A world of possible discoveries'}<span className="count-badge">{visibleCards.length}</span></h2><p>{view === 'My collection' ? 'Confirmed native NFT ownership. Pending transfers stay here until mined.' : snapshot?.blocks.length ? 'Recent native NFTs on this node’s canonical testnet chain.' : 'Sample previews only; mined NFTs use random Wikipedia pages with pictures. The same page may be minted more than once.'}</p></div>{view === 'Discover' && <button className="text-button" onClick={() => setView('My collection')}>My collection <ArrowRight size={16} /></button>}</div>
          <div className="filter-bar"><div className="category-tabs">{['All cards', 'Nature', 'Space', 'Science', 'People', 'History', 'Culture'].map(c => <button key={c} className={category === c ? 'selected' : ''} onClick={() => setCategory(c)}>{c}</button>)}</div><label className="search-input"><Search size={15} /><input aria-label="Search cards" placeholder="Find a discovery…" value={query} onChange={e => setQuery(e.target.value)} /></label></div>
          {filtered.length ? <div className="card-grid">{filtered.map(c => <div className="card-wrap" key={c.block?.tokenId ?? c.hash}><Card card={c} onClick={() => { setSelected(c); setTransferError(''); }} /><div className="card-list-caption"><span>{c.block ? `Block #${c.block.height}` : 'Example discovery'}</span><span className="caption-dot" />{c.block && snapshot ? short(testnetOwnerOf(snapshot, c.block.tokenId) ?? '') : 'Not owned'}</div>{c.block && snapshot?.pendingTransfers.some(tx => transactionCardIds(tx).includes(c.block!.tokenId)) && <span className="pending-label">Transfer or trade pending mining</span>}</div>)}</div> : <div className="empty-state"><img className="empty-state-logo" src="/original-logo.svg" alt="Wikideck" /><h3>{query || category !== 'All cards' ? 'No discoveries here. Yet.' : 'Your first discovery is waiting.'}</h3><p>{query || category !== 'All cards' ? 'Try another search or explore a different category.' : 'Use the native miner or receive a mined transfer on this chain. Restore a backup to access an existing wallet.'}</p><button className="button dark" onClick={goMine}><Pickaxe size={16} /> Explore native mining</button></div>}
        </section> : <section className="explorer-section"><div className="section-eyebrow">FOLLOW THE CANONICAL CHAIN</div><div className="section-heading"><div><h1>Block explorer<span className="count-badge">{snapshot?.blocks.length ?? 0}</span></h1><p>Native NFT mints, RandomX proofs, and mined ownership transfers.</p></div><a className="button outline" href="/api/chain" target="_blank" rel="noreferrer">View full chain JSON <ExternalLink size={15} /></a></div>
          <div className="explorer-note"><Shield size={18} /><p>Sovereign testnet with independently validating peers and cumulative-work chain selection. This network is unbootstrapped, not a public mainnet. Zero peers means an isolated node, not a connected network. Canonical ownership can change during a reorganization.</p></div>
          <dl className="chain-summary"><div><dt>Cumulative work</dt><dd>{snapshot?.cumulativeWork ?? '—'}</dd></div><div><dt>Peer count</dt><dd>{rpcAvailable ? snapshot?.peers ?? '—' : 'Unknown'} · {peerLabel}</dd></div><div><dt>Chain ID · pinned genesis</dt><dd>{snapshot?.chainId ?? '—'}</dd></div><div><dt>Network</dt><dd>{NETWORK}</dd></div><div><dt>Tip block ID</dt><dd>{snapshot?.tip ?? '—'}</dd></div><div><dt>Mint maturity</dt><dd>{snapshot?.maturity ?? CONSENSUS.coinbaseMaturity} subsequent blocks at inclusion height</dd></div></dl>
          {snapshot?.blocks.length ? <div className="table-scroll"><table><thead><tr><th>Block / confirmations</th><th>Discovery</th><th>Block ID / NFT token ID</th><th>Confirmed owner</th><th>RandomX proof / rarity</th></tr></thead><tbody>{[...snapshot.blocks].reverse().map(b => <tr key={b.hash}><td><button className="explorer-card-link" onClick={() => setSelected(asCard(b))}>#{b.height.toString().padStart(4, '0')}</button><small>{snapshot.blocks.length - b.height + 1} confirmations</small></td><td><strong>{b.article.title}</strong><small>Wikipedia #{b.article.pageId}</small></td><td className="mono"><span title={b.hash}>Block {short(b.hash)}</span><a className="nft-link" href={`/api/nfts/${encodeURIComponent(b.tokenId)}`} target="_blank" rel="noreferrer" title={b.tokenId}>NFT {short(b.tokenId)} <ExternalLink size={11} /></a></td><td className="mono" title={testnetOwnerOf(snapshot, b.tokenId)}>{short(testnetOwnerOf(snapshot, b.tokenId) ?? '')}</td><td><span className="proof-caption mono" title={b.powHash}>{short(b.powHash)}</span><span className={`rarity-tag ${rarity(b.powHash).toLowerCase()}`}>{rarity(b.powHash)}</span></td></tr>)}</tbody></table></div> : <div className="empty-state"><img className="empty-state-logo" src="/original-logo.svg" alt="Wikideck" /><h3>A new chain. A blank page.</h3><p>No NFT blocks loaded yet. Mine a block to earn the next Wikipedia card.</p><button className="button dark" onClick={goMine}>Explore RandomX mining <ArrowRight size={16} /></button></div>}
          <h2 className="transfer-title">Mined transfers and trades</h2>{snapshot?.transfers.length ? <div className="journal">{snapshot.transfers.map((tx, i) => isNftTrade(tx)
            ? <div key={`trade-${tx.proposerSignature}`}><ArrowLeftRight size={18}/><span>{tx.offered.length} cards {short(tx.proposer)} ⇄ {tx.requested.length} cards {short(tx.counterparty)}</span><span>Atomic trade · mined #{snapshot.blocks.find(b => b.transactions.some(item => isNftTrade(item) && item.proposerSignature === tx.proposerSignature))?.height ?? '—'}</span><Check size={14} aria-label={`Mined trade ${i + 1}`}/></div>
            : <div key={`${tx.cardHash}-${tx.sequence}`}><ArrowDownLeft size={18}/><a href={`/api/nfts/${encodeURIComponent(tx.cardHash)}`} target="_blank" rel="noreferrer" title={tx.cardHash}>{short(tx.cardHash)}</a><span>{short(tx.from)} → {short(tx.to)}</span><span>Sequence {tx.sequence} · mined #{snapshot.blocks.find(b => b.transactions.some(item => !isNftTrade(item) && item.signature === tx.signature))?.height ?? '—'}</span><Check size={14} aria-label={`Mined transfer ${i + 1}`}/></div>)}</div> : <p className="muted">No mined transfers or trades.</p>}
          <h2 className="transfer-title">Pending transfers and trades <span className="count-badge">{snapshot?.pendingTransfers.length ?? 0}</span></h2><p className="muted">Mempool only · not confirmed ownership. A trade bundle is included in full or not at all; pending transactions may be dropped or invalidated by a reorganization.</p><div className="journal">{snapshot?.pendingTransfers.map((tx, i) => isNftTrade(tx)
            ? <div key={`pending-trade-${tx.proposerSignature}`}><LoaderCircle size={16}/><span>{tx.offered.length} cards {short(tx.proposer)} ⇄ {tx.requested.length} cards {short(tx.counterparty)}</span><span className="pending-label">Atomic trade · awaiting mining</span></div>
            : <div key={`${tx.cardHash}-${tx.sequence}`}><LoaderCircle size={16}/><span title={tx.cardHash}>{short(tx.cardHash)}</span><span>{short(tx.from)} → {short(tx.to)}</span><span className="pending-label">Awaiting mining</span></div>)}</div>
        </section>}
        <footer><a href="https://en.wikipedia.org" target="_blank" rel="noreferrer"><BookOpen size={16} /> Wikipedia pages. Collectible discoveries.</a><span>Mine. Collect. Trade.<span className="footer-star">✦</span></span><p>Independent project, not affiliated with Wikimedia or Monero. NFT rewards represent Wikipedia article snapshots, not ownership of Wikipedia pages or their copyright. Attribution and image licenses appear on each card. Current network: experimental testnet; cryptocurrency payments are simulated and TCG play is planned. No promised monetary value.</p></footer>
      </main>
    </div>
    {toast && <div className="toast" role="status"><span><Check size={16} /></span>{toast}<button onClick={() => setToast('')} aria-label="Dismiss notification"><X size={14} /></button></div>}
    {(dialog || selected) && <div className="modal-backdrop" onClick={e => { if (e.target === e.currentTarget) close(); }}><section className={`modal ${dialog === 'wallet' ? 'wallet-modal' : selected && !dialog ? 'card-modal' : ''}`} role="dialog" aria-modal="true" aria-label={dialog === 'wallet' ? 'Local testnet wallet' : dialog === 'transfer' ? 'Transfer native NFT' : dialog === 'guide' ? 'How Wikideck works' : 'Card details'}><button className="modal-close" aria-label="Close dialog" onClick={close} disabled={transferBusy}><X size={20} /></button>
      {dialog === 'guide' ? <>
        <span className="modal-icon"><Sparkles size={24}/></span><div className="section-eyebrow">THE WIKIDECK FIELD GUIDE</div><h2>Mine. Collect. Make it yours.</h2>
        <div className="guide-steps">
          <div><span>01</span><div><h3>Mine a block. Earn a Wikipedia card.</h3><p>Wikideck is an NFT blockchain: each accepted block rewards its miner with a card based on a random illustrated Wikipedia page and its mint-time statistics. RandomX, also used by Monero, is designed for competitive mining on consumer CPUs. Wikideck is its own network, not part of Monero. Mining uses CPU, memory and energy; rewards depend on hardware and network difficulty.</p></div></div>
          <div><span>02</span><div><h3>Build a collection. Trade your discoveries.</h3><p>Collect broadly or focus on a theme. Your encrypted local wallet controls your cards. Trade decks lets two players sign a multi-card swap that settles together when mined. Fixed-price sales and timed auctions live in the connected peer’s market. Transfers remain pending until mined, and chain reorganizations can change ownership and confirmations.</p></div></div>
          <div><span>03</span><div><h3>Host a peer. Grow a community.</h3><p>A peer can host a general-purpose market or a community devoted to a collection. Listings and orders stay with that host, while card ownership follows the shared blockchain. Sales allocate a configurable hosting fee to the operator and a hardcoded 1% author fee. Prices are in USD with XMR cryptocurrency settlement planned; today payments, fees and payouts are simulations only.</p></div></div>
          <div><span>04</span><div><h3>Custom trading card games — coming later.</h3><p>Playing TCGs with your cards and hosting custom TCGs on a peer are planned, not implemented. The open-source direction is to give operators freedom to adapt their market and future games; publishing the software license is still pending. Built-in collection curation and custom rules hosting are also future work. Shared consensus remains the same across compatible peers.</p></div></div>
        </div>
        <div className="info-box"><strong>Collectible cards, not ownership of Wikipedia.</strong><p>NFT rewards represent article snapshots, not rights to Wikipedia text or images. Follow each card’s attribution and licenses. This is an experimental testnet, not a launched production network; never send real XMR to its mock checkout. Current stats are not final TCG rules or a promise of financial value.</p></div>
        <button className="button dark full" onClick={() => { close(); goMine(); }}>Explore RandomX mining <ArrowRight size={16}/></button>
      </>
      : dialog === 'wallet' ? <><span className="modal-icon"><WalletIcon size={24} /></span><div className="section-eyebrow">YOUR LOCAL TESTNET IDENTITY</div><h2>A wallet for your wonders.</h2><p className="muted">No server login. This recoverable wallet controls native NFTs through local signatures. It is separate from the original demo wallet.</p><label className="field-label">YOUR RECEIVE ADDRESS</label><div className="address-box">{wallet?.address ?? 'Wallet unavailable. Enable local browser storage and retry.'}</div><button className="button dark full" onClick={copyAddress} disabled={!wallet}><Copy size={16} /> Copy wallet address</button><div className="wallet-recovery"><WalletPanel wallet={wallet} onRestore={updateWallet} onNotice={setToast} /></div><p className="wallet-count"><Layers3 size={17} /> {owned.length} confirmed native NFTs in your collection</p></>
      : dialog === 'transfer' ? <><span className="modal-icon"><ArrowUpRight size={24} /></span><div className="section-eyebrow">PASS ON THE CURIOSITY</div><h2>Send {selected?.article.title}.</h2><p className="muted">Use the recipient’s 64-character testnet wallet address on this same chain. Signing submits a pending transaction; it does not immediately transfer ownership.</p><label className="field-label">NFT TOKEN ID</label><div className="address-box">{selected?.block?.tokenId}</div><label className="field-label" htmlFor="recipient">RECIPIENT ADDRESS</label><input className="recipient-input" id="recipient" value={recipient} disabled={transferBusy} onChange={e => setRecipient(e.target.value)} placeholder="Paste a 64-character wallet address" autoComplete="off" maxLength={64} /><div className="info-box"><strong>Review before signing.</strong><p>Transfers take effect only when mined into the canonical chain. Once confirmed, there is no undo button or recovery for a wrong address. Mints require two subsequent blocks at inclusion height; only one pending transfer per NFT is allowed.</p></div>{(!rpcAvailable || transferDisabledReason) && <p className="transfer-error" role="alert">{!rpcAvailable ? 'RPC unavailable. Reconnect before signing.' : transferDisabledReason}</p>}{transferError && <p className="transfer-error" role="alert">{transferError}</p>}<button className="button dark full" disabled={transferBusy || !rpcAvailable || !!transferDisabledReason || !/^[a-fA-F0-9]{64}$/.test(recipient.trim()) || recipient.trim().toLowerCase() === wallet?.address} onClick={transfer}>{transferBusy ? <LoaderCircle className="spin" size={16} /> : <ArrowUpRight size={16} />}{transferBusy ? 'Signing & submitting…' : 'Sign & submit pending transfer'}</button></>
      : selected && <><div className="detail-card"><Card card={selected} /></div><div className="detail-copy"><div className="section-eyebrow">{selected.block ? `MINTED IN BLOCK #${selected.block.height}` : 'EXAMPLE CARD · NOT OWNED'}</div><h2>{selected.article.title}</h2><p>{selected.article.extract}</p><div className="detail-facts"><span>Page ID<strong>#{selected.article.pageId}</strong></span><span>Rarity<strong>{rarity(selected.hash)}</strong></span><span>Content<strong>{selected.article.source === 'live' ? `Pinned revision ${selected.article.revisionId}` : 'Sample preview'}</strong></span></div>{selected.block && <><label className="field-label">NATIVE NFT TOKEN ID</label><div className="address-box">{selected.block.tokenId}</div><label className="field-label">BLOCK ID</label><div className="address-box">{selected.block.hash}</div><label className="field-label">RANDOMX PROOF HASH · GAME STATS</label><div className="address-box">{selected.hash}</div><p className="muted">{confirmations} canonical confirmations{!rpcAvailable ? ' · last known state' : ''}. {selectedBlock ? `Confirmed owner: ${selectedOwner}` : 'This mint is not on the loaded canonical chain.'}</p>{pending && <p className="pending-label">Transfer pending mining · confirmed owner unchanged.</p>}</>}<div className="detail-links"><a href={selected.article.url} target="_blank" rel="noreferrer">Read on Wikipedia <ExternalLink size={14} /></a><a href={imageCredit(selected.article)} target="_blank" rel="noreferrer">Image & license <ExternalLink size={14} /></a>{selected.block && <a href={`/api/nfts/${encodeURIComponent(selected.block.tokenId)}`} target="_blank" rel="noreferrer">NFT metadata <ExternalLink size={14} /></a>}</div><p className="attribution">{selected.article.source === 'live' ? 'Pinned text by Wikipedia contributors, CC BY-SA 4.0. Excerpt shortened for card display.' : 'Original fixed starter summary, linked to the real Wikipedia article; no live revision captured.'} Stats are game values, not encyclopedia facts. NFT ownership grants no rights to article text or images.</p>{selected.block && selectedOwner === wallet?.address && <>{transferDisabledReason && <p className="muted">{transferDisabledReason}</p>}<button className="button dark full" disabled={!rpcAvailable || !!transferDisabledReason} onClick={() => { setRecipient(''); setTransferError(''); setDialog('transfer'); }}>Transfer native NFT <ArrowUpRight size={16} /></button></>}</div></>}
    </section></div>}
  </div>;
}