// CommandPalette — ⌘K overlay. Glass surface, blue focus ring.

const CommandPalette = ({ open, onClose, onRun }) => {
  const [q, setQ] = React.useState('');
  const [sel, setSel] = React.useState(0);
  const inputRef = React.useRef(null);

  const items = React.useMemo(() => [
    { id: 'build',  label: 'Build project',     hint: '⌘B', kind: 'Action' },
    { id: 'deploy', label: 'Deploy to prod',    hint: '⌘D', kind: 'Action' },
    { id: 'theme',  label: 'Theme: Australis Dark', hint: '⌘T', kind: 'Setting' },
    { id: 'tokens', label: 'Open tokens.css',   hint: 'go',  kind: 'File' },
    { id: 'aurora', label: 'Open aurora.ts',    hint: 'go',  kind: 'File' },
    { id: 'sign',   label: 'Sign out',          hint: '',    kind: 'Action', danger: true },
  ], []);

  const filtered = items.filter(i => i.label.toLowerCase().includes(q.toLowerCase()));

  React.useEffect(() => {
    if (open && inputRef.current) inputRef.current.focus();
    setQ(''); setSel(0);
  }, [open]);

  React.useEffect(() => {
    if (!open) return;
    const onKey = (e) => {
      if (e.key === 'Escape') onClose();
      if (e.key === 'ArrowDown') { e.preventDefault(); setSel(s => Math.min(s + 1, filtered.length - 1)); }
      if (e.key === 'ArrowUp')   { e.preventDefault(); setSel(s => Math.max(s - 1, 0)); }
      if (e.key === 'Enter' && filtered[sel]) { onRun(filtered[sel]); onClose(); }
    };
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, [open, sel, filtered, onClose, onRun]);

  if (!open) return null;

  return (
    <div style={cpStyles.scrim} onClick={onClose}>
      <div style={cpStyles.panel} onClick={e => e.stopPropagation()}>
        <div style={cpStyles.head}>
          <Icon name="search" size={16} style={{ color: 'var(--fg-3)' }}/>
          <input
            ref={inputRef}
            value={q}
            onChange={e => { setQ(e.target.value); setSel(0); }}
            placeholder="Type a command…"
            style={cpStyles.input}
          />
          <span style={cpStyles.esc}>esc</span>
        </div>
        <div style={cpStyles.list}>
          {filtered.length === 0 && (
            <div style={cpStyles.empty}>No matches.</div>
          )}
          {filtered.map((it, i) => (
            <div key={it.id}
              onMouseEnter={() => setSel(i)}
              onClick={() => { onRun(it); onClose(); }}
              style={{
                ...cpStyles.item,
                background: i === sel ? 'rgba(99,136,216,0.18)' : 'transparent',
                color: i === sel ? '#a4c4ff' : (it.danger ? '#ff854f' : 'var(--fg-1)'),
              }}>
              <Icon name={it.kind === 'File' ? 'file' : it.kind === 'Setting' ? 'settings' : 'play'} size={14}
                style={{ color: i === sel ? '#a4c4ff' : 'var(--fg-3)' }}/>
              <span style={{ flex: 1 }}>{it.label}</span>
              <span style={cpStyles.kind}>{it.kind}</span>
              {it.hint && <span style={cpStyles.hint}>{it.hint}</span>}
            </div>
          ))}
        </div>
      </div>
    </div>
  );
};

const cpStyles = {
  scrim: {
    position: 'absolute', inset: 0,
    background: 'rgba(34,37,49,0.72)',
    backdropFilter: 'blur(4px)',
    display: 'flex', alignItems: 'flex-start', justifyContent: 'center',
    paddingTop: '15vh',
    zIndex: 100,
  },
  panel: {
    width: 540,
    background: 'rgba(55,59,70,0.85)',
    backdropFilter: 'blur(16px)',
    border: '1px solid #565f69',
    borderRadius: 10,
    boxShadow: '0 24px 64px rgba(10,12,18,0.6), 0 8px 16px rgba(10,12,18,0.45)',
    overflow: 'hidden',
  },
  head: {
    display: 'flex', alignItems: 'center', gap: 10,
    padding: '12px 14px',
    borderBottom: '1px solid #414751',
  },
  input: {
    flex: 1, background: 'transparent', border: 0, outline: 'none',
    color: 'var(--fg-0)',
    fontFamily: 'var(--font-sans)', fontSize: 14,
  },
  esc: {
    fontFamily: 'var(--font-mono)', fontSize: 10,
    color: 'var(--fg-3)', background: '#1b1e28',
    padding: '2px 6px', borderRadius: 4, border: '1px solid #414751',
  },
  list: { padding: 6, maxHeight: 360, overflowY: 'auto' },
  item: {
    display: 'flex', alignItems: 'center', gap: 10,
    padding: '8px 10px',
    borderRadius: 5,
    fontSize: 13,
    cursor: 'pointer',
  },
  kind: {
    fontFamily: 'var(--font-mono)', fontSize: 10,
    color: 'var(--fg-3)',
    textTransform: 'uppercase', letterSpacing: '0.06em',
  },
  hint: {
    fontFamily: 'var(--font-mono)', fontSize: 10,
    color: 'var(--fg-3)', background: '#1b1e28',
    padding: '2px 6px', borderRadius: 4, border: '1px solid #414751',
  },
  empty: { padding: 16, fontSize: 13, color: 'var(--fg-3)' },
};

window.CommandPalette = CommandPalette;