import { h } from 'preact';
import { useState, useMemo } from 'preact/hooks';

// A dropdown with an inline search box. Extracted from SyntheticWizard so the
// same searchable picker can be reused (e.g. the logic editor's signal field).
export default function SearchableSelect({
  value,
  options,
  onSelect,
  placeholder = 'Select…',
}: {
  value: string;
  options: string[];
  onSelect: (val: string) => void;
  placeholder?: string;
}) {
  const [open, setOpen] = useState(false);
  const [filter, setFilter] = useState('');

  const filtered = useMemo(() => {
    const f = filter.toLowerCase();
    return options.filter(o => o.toLowerCase().includes(f));
  }, [options, filter]);

  return (
    <div class="search-select">
      <div class="search-select-trigger" onClick={() => setOpen(!open)}>
        {value || <span class="search-select-placeholder">{placeholder}</span>}
        <span class="search-select-arrow">{open ? '▴' : '▾'}</span>
      </div>
      {open && (
        <div class="search-select-dropdown">
          <input
            class="prop-input"
            autoFocus
            placeholder="Search…"
            value={filter}
            onInput={(e) => setFilter((e.target as HTMLInputElement).value)}
            onClick={(e) => e.stopPropagation()}
          />
          <div class="search-select-list">
            {filtered.length === 0 && <div class="search-select-item hint">No matches</div>}
            {filtered.map(opt => (
              <div
                key={opt}
                class={`search-select-item${opt === value ? ' search-select-item-selected' : ''}`}
                onClick={() => { onSelect(opt); setOpen(false); setFilter(''); }}
              >
                {opt}
              </div>
            ))}
          </div>
        </div>
      )}
      {open && <div class="search-select-backdrop" onClick={() => setOpen(false)} />}
    </div>
  );
}