/* eslint-disable @typescript-eslint/no-explicit-any,no-console */

import { NextRequest, NextResponse } from 'next/server';

import { getAuthInfoFromCookie } from '@/lib/auth';
import { getAvailableApiSites, getConfig } from '@/lib/config';
import { searchFromApi } from '@/lib/downstream';
import { yellowWords } from '@/lib/yellow';

export const runtime = 'nodejs';

export async function GET(request: NextRequest) {
  const authInfo = getAuthInfoFromCookie(request);
  if (!authInfo || !authInfo.username) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }

  const { searchParams } = new URL(request.url);
  const query = searchParams.get('q');

  if (!query) {
    return new Response(
      JSON.stringify({ error: '搜索关键词不能为空' }),
      {
        status: 400,
        headers: {
          'Content-Type': 'application/json',
        },
      }
    );
  }

  const config = await getConfig();
  const apiSites = await getAvailableApiSites(authInfo.username);

  // 检查是否配置了 OpenList
  const hasOpenList = !!(config.OpenListConfig?.URL && config.OpenListConfig?.Token);

  // 共享状态
  let streamClosed = false;

  // 创建可读流
  const stream = new ReadableStream({
    async start(controller) {
      const encoder = new TextEncoder();

      // 辅助函数：安全地向控制器写入数据
      const safeEnqueue = (data: Uint8Array) => {
        try {
          if (streamClosed || (!controller.desiredSize && controller.desiredSize !== 0)) {
            // 流已标记为关闭或控制器已关闭
            return false;
          }
          controller.enqueue(data);
          return true;
        } catch (error) {
          // 控制器已关闭或出现其他错误
          console.warn('Failed to enqueue data:', error);
          streamClosed = true;
          return false;
        }
      };

      // 发送开始事件
      const startEvent = `data: ${JSON.stringify({
        type: 'start',
        query,
        totalSources: apiSites.length + (hasOpenList ? 1 : 0),
        timestamp: Date.now()
      })}\n\n`;

      if (!safeEnqueue(encoder.encode(startEvent))) {
        return; // 连接已关闭，提前退出
      }

      // 记录已完成的源数量
      let completedSources = 0;
      const allResults: any[] = [];

      // 搜索 OpenList（如果配置了）
      if (hasOpenList) {
        try {
          const { getCachedMetaInfo, setCachedMetaInfo } = await import('@/lib/openlist-cache');
          const { getTMDBImageUrl } = await import('@/lib/tmdb.search');
          const { db } = await import('@/lib/db');

          const rootPath = config.OpenListConfig!.RootPath || '/';
          let metaInfo = getCachedMetaInfo(rootPath);

          // 如果没有缓存，尝试从数据库读取
          if (!metaInfo) {
            try {
              const metainfoJson = await db.getGlobalValue('video.metainfo');
              if (metainfoJson) {
                metaInfo = JSON.parse(metainfoJson);
                if (metaInfo) {
                  setCachedMetaInfo(rootPath, metaInfo);
                }
              }
            } catch (error) {
              console.error('[Search WS] 从数据库读取 metainfo 失败:', error);
            }
          }

          if (metaInfo && metaInfo.folders) {
            const openlistResults = Object.entries(metaInfo.folders)
              .filter(([folderName, info]: [string, any]) => {
                const matchFolder = folderName.toLowerCase().includes(query.toLowerCase());
                const matchTitle = info.title.toLowerCase().includes(query.toLowerCase());
                return matchFolder || matchTitle;
              })
              .map(([folderName, info]: [string, any]) => ({
                id: folderName,
                source: 'openlist',
                source_name: '私人影库',
                title: info.title,
                poster: getTMDBImageUrl(info.poster_path),
                episodes: [],
                episodes_titles: [],
                year: info.release_date.split('-')[0] || '',
                desc: info.overview,
                type_name: info.media_type === 'movie' ? '电影' : '电视剧',
                douban_id: 0,
              }));

            completedSources++;

            if (!streamClosed) {
              const sourceEvent = `data: ${JSON.stringify({
                type: 'source_result',
                source: 'openlist',
                sourceName: '私人影库',
                results: openlistResults,
                timestamp: Date.now()
              })}\n\n`;

              if (!safeEnqueue(encoder.encode(sourceEvent))) {
                streamClosed = true;
                return;
              }

              if (openlistResults.length > 0) {
                allResults.push(...openlistResults);
              }
            }
          } else {
            completedSources++;

            if (!streamClosed) {
              const sourceEvent = `data: ${JSON.stringify({
                type: 'source_result',
                source: 'openlist',
                sourceName: '私人影库',
                results: [],
                timestamp: Date.now()
              })}\n\n`;

              if (!safeEnqueue(encoder.encode(sourceEvent))) {
                streamClosed = true;
                return;
              }
            }
          }
        } catch (error) {
          console.error('[Search WS] 搜索 OpenList 失败:', error);
          completedSources++;

          if (!streamClosed) {
            const errorEvent = `data: ${JSON.stringify({
              type: 'source_error',
              source: 'openlist',
              sourceName: '私人影库',
              error: error instanceof Error ? error.message : '搜索失败',
              timestamp: Date.now()
            })}\n\n`;

            if (!safeEnqueue(encoder.encode(errorEvent))) {
              streamClosed = true;
              return;
            }
          }
        }
      }

      // 为每个源创建搜索 Promise
      const searchPromises = apiSites.map(async (site) => {
        try {
          // 添加超时控制
          const searchPromise = Promise.race([
            searchFromApi(site, query),
            new Promise((_, reject) =>
              setTimeout(() => reject(new Error(`${site.name} timeout`)), 20000)
            ),
          ]);

          const results = await searchPromise as any[];

          // 过滤黄色内容
          let filteredResults = results;
          if (!config.SiteConfig.DisableYellowFilter) {
            filteredResults = results.filter((result) => {
              const typeName = result.type_name || '';
              return !yellowWords.some((word: string) => typeName.includes(word));
            });
          }

          // 发送该源的搜索结果
          completedSources++;

          if (!streamClosed) {
            const sourceEvent = `data: ${JSON.stringify({
              type: 'source_result',
              source: site.key,
              sourceName: site.name,
              results: filteredResults,
              timestamp: Date.now()
            })}\n\n`;

            if (!safeEnqueue(encoder.encode(sourceEvent))) {
              streamClosed = true;
              return; // 连接已关闭，停止处理
            }
          }

          if (filteredResults.length > 0) {
            allResults.push(...filteredResults);
          }

        } catch (error) {
          console.warn(`搜索失败 ${site.name}:`, error);

          // 发送源错误事件
          completedSources++;

          if (!streamClosed) {
            const errorEvent = `data: ${JSON.stringify({
              type: 'source_error',
              source: site.key,
              sourceName: site.name,
              error: error instanceof Error ? error.message : '搜索失败',
              timestamp: Date.now()
            })}\n\n`;

            if (!safeEnqueue(encoder.encode(errorEvent))) {
              streamClosed = true;
              return; // 连接已关闭，停止处理
            }
          }
        }

        // 检查是否所有源都已完成
        if (completedSources === apiSites.length + (hasOpenList ? 1 : 0)) {
          if (!streamClosed) {
            // 发送最终完成事件
            const completeEvent = `data: ${JSON.stringify({
              type: 'complete',
              totalResults: allResults.length,
              completedSources,
              timestamp: Date.now()
            })}\n\n`;

            if (safeEnqueue(encoder.encode(completeEvent))) {
              // 只有在成功发送完成事件后才关闭流
              try {
                controller.close();
              } catch (error) {
                console.warn('Failed to close controller:', error);
              }
            }
          }
        }
      });

      // 等待所有搜索完成
      await Promise.allSettled(searchPromises);
    },

    cancel() {
      // 客户端断开连接时，标记流已关闭
      streamClosed = true;
      console.log('Client disconnected, cancelling search stream');
    },
  });

  // 返回流式响应
  return new Response(stream, {
    headers: {
      'Content-Type': 'text/event-stream',
      'Cache-Control': 'no-cache',
      'Connection': 'keep-alive',
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'GET',
      'Access-Control-Allow-Headers': 'Content-Type',
    },
  });
}