/**
 * Language Selector Component
 * Dropdown for selecting the application language
 */

import React, { useState, useRef, useEffect } from 'react';
import { useTranslation } from 'react-i18next';
import { Globe, Check, ChevronDown } from 'lucide-react';
import { supportedLanguages, SupportedLanguage } from '../i18n';

interface LanguageSelectorProps {
  variant?: 'dropdown' | 'inline';
  showFlag?: boolean;
  className?: string;
}

const LanguageSelector: React.FC<LanguageSelectorProps> = ({
  variant = 'dropdown',
  showFlag = true,
  className = '',
}) => {
  const { i18n } = useTranslation();
  const [isOpen, setIsOpen] = useState(false);
  const dropdownRef = useRef<HTMLDivElement>(null);

  const currentLanguage = supportedLanguages.find(
    (lang) => lang.code === i18n.language
  ) || supportedLanguages[0];

  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (dropdownRef.current && !dropdownRef.current.contains(event.target as Node)) {
        setIsOpen(false);
      }
    };

    document.addEventListener('mousedown', handleClickOutside);
    return () => document.removeEventListener('mousedown', handleClickOutside);
  }, []);

  const handleLanguageChange = (code: SupportedLanguage) => {
    i18n.changeLanguage(code);
    setIsOpen(false);
  };

  if (variant === 'inline') {
    return (
      <div className={`flex flex-wrap gap-2 ${className}`}>
        {supportedLanguages.map((lang) => (
          <button
            key={lang.code}
            onClick={() => handleLanguageChange(lang.code)}
            className={`px-3 py-1.5 rounded-lg text-sm font-medium transition-colors ${
              i18n.language === lang.code
                ? 'bg-brand-600 text-white'
                : 'bg-gray-100 text-gray-700 hover:bg-gray-200 dark:bg-gray-700 dark:text-gray-300 dark:hover:bg-gray-600'
            }`}
          >
            {showFlag && <span className="mr-1.5">{lang.flag}</span>}
            {lang.name}
          </button>
        ))}
      </div>
    );
  }

  return (
    <div ref={dropdownRef} className={`relative ${className}`}>
      <button
        onClick={() => setIsOpen(!isOpen)}
        className="flex items-center gap-2 px-3 py-2 text-sm font-medium text-gray-700 dark:text-gray-300 bg-white dark:bg-gray-800 border border-gray-300 dark:border-gray-600 rounded-lg hover:bg-gray-50 dark:hover:bg-gray-700 focus:outline-none focus:ring-2 focus:ring-brand-500 transition-colors"
        aria-expanded={isOpen}
        aria-haspopup="listbox"
      >
        <Globe className="w-4 h-4" />
        {showFlag && <span>{currentLanguage.flag}</span>}
        <span className="hidden sm:inline">{currentLanguage.name}</span>
        <ChevronDown className={`w-4 h-4 transition-transform ${isOpen ? 'rotate-180' : ''}`} />
      </button>

      {isOpen && (
        <div className="absolute right-0 mt-2 w-48 bg-white dark:bg-gray-800 border border-gray-200 dark:border-gray-700 rounded-lg shadow-lg z-50 py-1 animate-in fade-in slide-in-from-top-2">
          <ul role="listbox" aria-label="Select language">
            {supportedLanguages.map((lang) => (
              <li key={lang.code}>
                <button
                  onClick={() => handleLanguageChange(lang.code)}
                  className={`w-full flex items-center gap-3 px-4 py-2 text-sm text-left transition-colors ${
                    i18n.language === lang.code
                      ? 'bg-brand-50 dark:bg-brand-900/20 text-brand-700 dark:text-brand-300'
                      : 'text-gray-700 dark:text-gray-300 hover:bg-gray-50 dark:hover:bg-gray-700'
                  }`}
                  role="option"
                  aria-selected={i18n.language === lang.code}
                >
                  <span className="text-lg">{lang.flag}</span>
                  <span className="flex-1">{lang.name}</span>
                  {i18n.language === lang.code && (
                    <Check className="w-4 h-4 text-brand-600 dark:text-brand-400" />
                  )}
                </button>
              </li>
            ))}
          </ul>
        </div>
      )}
    </div>
  );
};

export default LanguageSelector;
