import { useRef, useEffect } from 'react';
import { useCommandPalette } from './use-command-palette';
import { parseFilterPrefix, checkTrailingFilter } from './utils';
import styles from './CommandPalette.module.css';

export function PaletteInput() {
  const { query, filters, setQuery, addFilter, removeLastFilter, removeFilter } =
    useCommandPalette();
  const inputRef = useRef<HTMLInputElement>(null);

  useEffect(() => {
    inputRef.current?.focus();
  }, []);

  function handleChange(value: string) {
    // Check if user typed a filter prefix like "status:failed "
    const parsed = parseFilterPrefix(value);
    if (parsed) {
      addFilter(parsed.filter);
      setQuery(parsed.remaining);
      return;
    }
    const trailing = checkTrailingFilter(value);
    if (trailing) {
      addFilter(trailing);
      setQuery('');
      return;
    }
    setQuery(value);
  }

  function handleKeyDown(e: React.KeyboardEvent) {
    if (e.key === 'Backspace' && query === '' && filters.length > 0) {
      e.preventDefault();
      removeLastFilter();
    }
  }

  return (
    <div className={styles.inputWrap}>
      <svg className={styles.searchIcon} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
        <circle cx="11" cy="11" r="8" />
        <path d="m21 21-4.35-4.35" />
      </svg>
      {filters.length > 0 && (
        <div className={styles.chipList}>
          {filters.map((f, i) => (
            <span key={f.key} className={styles.chip}>
              <span className={styles.chipKey}>{f.key}:</span>
              {f.value}
              <button className={styles.chipRemove} onClick={() => removeFilter(i)}>
                &times;
              </button>
            </span>
          ))}
        </div>
      )}
      <input
        ref={inputRef}
        className={styles.input}
        type="text"
        value={query}
        onChange={(e) => handleChange(e.target.value)}
        onKeyDown={handleKeyDown}
        placeholder={filters.length > 0 ? 'Refine search...' : 'Search executions, agents...'}
      />
      <div className={styles.inputHint}>
        <kbd className={styles.kbd}>esc</kbd> close
      </div>
    </div>
  );
}