import { NextResponse } from 'next/server';

import { API_CONFIG, ApiSite, getApiSites, getCacheTime } from '@/lib/config';
import { SearchResult } from '@/lib/types';
import { cleanHtmlTags } from '@/lib/utils';

export const runtime = 'edge';

// 根据环境变量决定最大搜索页数，默认 5
const MAX_SEARCH_PAGES: number =
  Number(process.env.NEXT_PUBLIC_SEARCH_MAX_PAGE) || 5;

interface ApiSearchItem {
  vod_id: string;
  vod_name: string;
  vod_pic: string;
  vod_remarks?: string;
  vod_play_url?: string;
  vod_class?: string;
  vod_year?: string;
  vod_content?: string;
  vod_douban_id?: number;
  type_name?: string;
}

async function searchFromApi(
  apiSite: ApiSite,
  query: string
): Promise<SearchResult[]> {
  try {
    const apiBaseUrl = apiSite.api;
    const apiUrl =
      apiBaseUrl + API_CONFIG.search.path + encodeURIComponent(query);
    const apiName = apiSite.name;

    // 添加超时处理
    const controller = new AbortController();
    const timeoutId = setTimeout(() => controller.abort(), 8000);

    const response = await fetch(apiUrl, {
      headers: API_CONFIG.search.headers,
      signal: controller.signal,
    });

    clearTimeout(timeoutId);

    if (!response.ok) {
      return [];
    }

    const data = await response.json();
    if (
      !data ||
      !data.list ||
      !Array.isArray(data.list) ||
      data.list.length === 0
    ) {
      return [];
    }
    // 处理第一页结果
    const results = data.list.map((item: ApiSearchItem) => {
      let episodes: string[] = [];

      // 使用正则表达式从 vod_play_url 提取 m3u8 链接
      if (item.vod_play_url) {
        const m3u8Regex = /\$(https?:\/\/[^"'\s]+?\.m3u8)/g;
        // 先用 $$$ 分割
        const vod_play_url_array = item.vod_play_url.split('$$$');
        // 对每个分片做匹配，取匹配到最多的作为结果
        vod_play_url_array.forEach((url: string) => {
          const matches = url.match(m3u8Regex) || [];
          if (matches.length > episodes.length) {
            episodes = matches;
          }
        });
      }

      episodes = Array.from(new Set(episodes)).map((link: string) => {
        link = link.substring(1); // 去掉开头的 $
        const parenIndex = link.indexOf('(');
        return parenIndex > 0 ? link.substring(0, parenIndex) : link;
      });

      return {
        id: item.vod_id,
        title: item.vod_name.trim().replace(/\s+/g, ' '),
        poster: item.vod_pic,
        episodes,
        source: apiSite.key,
        source_name: apiName,
        class: item.vod_class,
        year: item.vod_year ? item.vod_year.match(/\d{4}/)?.[0] || '' : '',
        desc: cleanHtmlTags(item.vod_content || ''),
        type_name: item.type_name,
        douban_id: item.vod_douban_id,
      };
    });

    // 获取总页数
    const pageCount = data.pagecount || 1;
    // 确定需要获取的额外页数
    const pagesToFetch = Math.min(pageCount - 1, MAX_SEARCH_PAGES - 1);

    // 如果有额外页数，获取更多页的结果
    if (pagesToFetch > 0) {
      const additionalPagePromises = [];

      for (let page = 2; page <= pagesToFetch + 1; page++) {
        const pageUrl =
          apiBaseUrl +
          API_CONFIG.search.pagePath
            .replace('{query}', encodeURIComponent(query))
            .replace('{page}', page.toString());

        const pagePromise = (async () => {
          try {
            const pageController = new AbortController();
            const pageTimeoutId = setTimeout(
              () => pageController.abort(),
              8000
            );

            const pageResponse = await fetch(pageUrl, {
              headers: API_CONFIG.search.headers,
              signal: pageController.signal,
            });

            clearTimeout(pageTimeoutId);

            if (!pageResponse.ok) return [];

            const pageData = await pageResponse.json();

            if (!pageData || !pageData.list || !Array.isArray(pageData.list))
              return [];

            return pageData.list.map((item: ApiSearchItem) => {
              let episodes: string[] = [];

              // 使用正则表达式从 vod_play_url 提取 m3u8 链接
              if (item.vod_play_url) {
                const m3u8Regex = /\$(https?:\/\/[^"'\s]+?\.m3u8)/g;
                episodes = item.vod_play_url.match(m3u8Regex) || [];
              }

              episodes = Array.from(new Set(episodes)).map((link: string) => {
                link = link.substring(1); // 去掉开头的 $
                const parenIndex = link.indexOf('(');
                return parenIndex > 0 ? link.substring(0, parenIndex) : link;
              });

              return {
                id: item.vod_id,
                title: item.vod_name.trim().replace(/\s+/g, ' '),
                poster: item.vod_pic,
                episodes,
                source: apiSite.key,
                source_name: apiName,
                class: item.vod_class,
                year: item.vod_year
                  ? item.vod_year.match(/\d{4}/)?.[0] || ''
                  : '',
                desc: cleanHtmlTags(item.vod_content || ''),
                type_name: item.type_name,
                douban_id: item.vod_douban_id,
              };
            });
          } catch (error) {
            return [];
          }
        })();

        additionalPagePromises.push(pagePromise);
      }

      // 等待所有额外页的结果
      const additionalResults = await Promise.all(additionalPagePromises);

      // 合并所有页的结果
      additionalResults.forEach((pageResults) => {
        if (pageResults.length > 0) {
          results.push(...pageResults);
        }
      });
    }

    return results;
  } catch (error) {
    return [];
  }
}

export async function GET(request: Request) {
  const { searchParams } = new URL(request.url);
  const query = searchParams.get('q');

  if (!query) {
    const cacheTime = getCacheTime();
    return NextResponse.json(
      { results: [] },
      {
        headers: {
          'Cache-Control': `public, max-age=${cacheTime}`,
        },
      }
    );
  }

  const apiSites = getApiSites();
  const searchPromises = apiSites.map((site) => searchFromApi(site, query));

  try {
    const results = await Promise.all(searchPromises);
    const flattenedResults = results.flat();
    const cacheTime = getCacheTime();

    return NextResponse.json(
      { results: flattenedResults },
      {
        headers: {
          'Cache-Control': `public, max-age=${cacheTime}`,
        },
      }
    );
  } catch (error) {
    return NextResponse.json({ error: '搜索失败' }, { status: 500 });
  }
}