import { ref, computed } from 'vue';
import { useErrorHandler } from './useErrorHandler';
import { useI18n } from 'vue-i18n';

/**
 * 产品数据接口
 */
interface Product {
  id: string;
  title: string;
  description: string;
  summary: string;
  [key: string]: any;
}

/**
 * 搜索结果项接口
 */
interface SearchResult {
  id: string;
  title: string;
  name: string;
  description: string;
  summary: string;
  matchedField: string;
  matchedText: string;
}

/**
 * 全局搜索功能钩子
 * @returns 搜索相关状态和方法
 */
export function useSearch() {
  const searchResults = ref<SearchResult[]>([]);
  const isLoading = ref(false);
  const error = ref<string | null>(null);
  const { wrapAsync } = useErrorHandler();
  const { locale } = useI18n();
  
  /**
   * 搜索产品数据
   * @param keyword 搜索关键词
   * @returns Promise<void>
   */
  const searchProducts = async (keyword: string) => {
    if (!keyword.trim()) {
      searchResults.value = [];
      return;
    }

    isLoading.value = true;
    error.value = null;

    try {
      // 根据当前语言选择对应的JSON文件
      const lang = locale.value;
      const products = await fetch(`/data/products-${lang}.json`).then(res => res.json()) as Product[];

      const results: SearchResult[] = [];

      // 搜索数据
      products.forEach(product => {
        const fields = [
          { name: 'title', value: product.title },
          { name: 'description', value: product.description },
          { name: 'summary', value: product.summary }
        ];

        fields.forEach(field => {
          if (field.value && field.value.toLowerCase().includes(keyword.toLowerCase())) {
            results.push({
              id: product.id,
              title: product.title,
              name: product.name,
              description: product.description,
              summary: product.summary,
              matchedField: field.name,
              matchedText: field.value
            });
          }
        });
      });

      // 去重
      searchResults.value = Array.from(new Map(results.map(item => [item.id, item])).values());
    } catch (err) {
      error.value = '搜索失败，请稍后重试';
      console.error('Search error:', err);
    } finally {
      isLoading.value = false;
    }
  };

  /**
   * 高亮显示匹配的文本
   * @param text 原始文本
   * @param keyword 关键词
   * @returns 高亮后的HTML字符串
   */
  const highlightText = (text: string, keyword: string) => {
    if (!keyword || !text) return text;
    const regex = new RegExp(`(${keyword})`, 'gi');
    return text.replace(regex, '<span class="highlight">$1</span>');
  };

  return {
    searchResults,
    isLoading,
    error,
    searchProducts,
    highlightText
  };
}