import { Logger } from '@stock-bot/logger';
import createCache, { type CacheProvider } from '@stock-bot/cache';
import { HttpClient, ProxyInfo } from '@stock-bot/http';
import pLimit from 'p-limit';

export class ProxyService {
  private logger = new Logger('proxy-service');
  private cache: CacheProvider = createCache('hybrid');
  private httpClient: HttpClient;
  private readonly concurrencyLimit = pLimit(10);
  private readonly CACHE_KEY = 'proxy';
  private readonly CACHE_TTL = 86400; // 24 hours
  private readonly CHECK_TIMEOUT = 5000;
  private readonly CHECK_URL = 'https://proxy-detection.stare.gg/?api_key=bd406bf53ddc6abe1d9de5907830a955';
  private readonly PROXY_SOURCES = [
    // { url: 'https://raw.githubusercontent.com/BreakingTechFr/Proxy_Free/refs/heads/main/proxies/http.txt', protocol: 'http' },
    // {url: 'https://raw.githubusercontent.com/TheSpeedX/PROXY-List/master/http.txt',protocol: 'http', },
    // {url: 'https://raw.githubusercontent.com/ErcinDedeoglu/proxies/main/proxies/http.txt',protocol: 'http', },
    // {url: 'https://raw.githubusercontent.com/monosans/proxy-list/main/proxies/http.txt',protocol: 'http', },
    // {url: 'https://raw.githubusercontent.com/TuanMinPay/live-proxy/master/http.txt',protocol: 'http', },
    // {url: 'https://raw.githubusercontent.com/casals-ar/proxy-list/main/http',protocol: 'http', },
    // {url: 'https://raw.githubusercontent.com/prxchk/proxy-list/main/http.txt',protocol: 'http', },
    // {url: 'https://raw.githubusercontent.com/MuRongPIG/Proxy-Master/main/http.txt',protocol: 'http', },
    // {url: 'https://raw.githubusercontent.com/vakhov/fresh-proxy-list/master/http.txt',protocol: 'http', },
    // {url: 'https://raw.githubusercontent.com/sunny9577/proxy-scraper/master/proxies.txt',protocol: 'http', },
    // {url: 'https://raw.githubusercontent.com/ErcinDedeoglu/proxies/main/proxies/https.txt',protocol: 'https', },
    {url: 'https://raw.githubusercontent.com/MuRongPIG/Proxy-Master/main/socks4.txt',protocol: 'socks4', },
    {url: 'https://raw.githubusercontent.com/TheSpeedX/PROXY-List/master/socks4.txt',protocol: 'socks4', },
    {url: 'https://raw.githubusercontent.com/TuanMinPay/live-proxy/master/socks4.txt',protocol: 'socks4', },
    {url: 'https://raw.githubusercontent.com/casals-ar/proxy-list/main/socks4',protocol: 'socks4', },
    {url: 'https://raw.githubusercontent.com/prxchk/proxy-list/main/socks4.txt',protocol: 'socks4', },
    {url: 'https://raw.githubusercontent.com/BreakingTechFr/Proxy_Free/refs/heads/main/proxies/socks4.txt',protocol: 'socks4', },
    {url: 'https://raw.githubusercontent.com/ErcinDedeoglu/proxies/main/proxies/socks4.txt',protocol: 'socks4', },
    {url: 'https://raw.githubusercontent.com/monosans/proxy-list/main/proxies/socks4.txt',protocol: 'socks4', },
    {url: 'https://raw.githubusercontent.com/TheSpeedX/PROXY-List/master/socks5.txt',protocol: 'socks5', },
    {url: 'https://raw.githubusercontent.com/hookzof/socks5_list/master/proxy.txt',protocol: 'socks5', },
    {url: 'https://raw.githubusercontent.com/ErcinDedeoglu/proxies/main/proxies/socks5.txt',protocol: 'socks5', },
    {url: 'https://raw.githubusercontent.com/monosans/proxy-list/main/proxies/socks5.txt',protocol: 'socks5', },
    {url: 'https://raw.githubusercontent.com/TuanMinPay/live-proxy/master/socks5.txt',protocol: 'socks5', },
    {url: 'https://raw.githubusercontent.com/casals-ar/proxy-list/main/socks5',protocol: 'socks5', },
    {url: 'https://raw.githubusercontent.com/prxchk/proxy-list/main/socks5.txt',protocol: 'socks5', },
    {url: 'https://raw.githubusercontent.com/hookzof/socks5_list/master/proxy.txt',protocol: 'socks5', },
    {url: 'https://raw.githubusercontent.com/MuRongPIG/Proxy-Master/main/socks5.txt',protocol: 'socks5', },
    {url: 'https://raw.githubusercontent.com/BreakingTechFr/Proxy_Free/refs/heads/main/proxies/socks5.txt',protocol: 'socks5', },
  ]

  constructor() {
    this.httpClient = new HttpClient({
      timeout: this.CHECK_TIMEOUT,
    }, this.logger);
   
    this.logger.info('ProxyService initialized');
  }
  

  async fetchProxiesFromSources() : Promise<boolean> {
    const sources = this.PROXY_SOURCES.map(source => 
      this.concurrencyLimit(() => this.fetchProxiesFromSource(source))
  )
    const result = await Promise.all(sources);
    const allProxies: ProxyInfo[] = result.flat();
    await this.checkProxies(this.removeDuplicateProxies(allProxies))
    return true
  }

  private removeDuplicateProxies(proxies: ProxyInfo[]): ProxyInfo[] {
    const seen = new Set<string>();
    const unique: ProxyInfo[] = [];
    
    for (const proxy of proxies) {
      const key = `${proxy.protocol}://${proxy.host}:${proxy.port}`;
      if (!seen.has(key)) {
        seen.add(key);
        unique.push(proxy);
      }
    }
    
    return unique;
  }


  async fetchProxiesFromSource(source: { url: string; protocol: string }): Promise<ProxyInfo[]> {
    const allProxies: ProxyInfo[] = [];
    
      try {
        this.logger.info(`Fetching proxies from ${source.url}`);
        
        const response = await this.httpClient.get(source.url, {
          timeout: 10000
        });
        
        if (response.status !== 200) {
          this.logger.warn(`Failed to fetch from ${source.url}: ${response.status}`);
          return []
        }
        
        const text = response.data;
        const lines = text.split('\n').filter((line: string) => line.trim());
        
        for (const line of lines) {
          const trimmed = line.trim();
          if (!trimmed || trimmed.startsWith('#')) continue;
          
          // Parse formats like "host:port" or "host:port:user:pass"
          const parts = trimmed.split(':');
          if (parts.length >= 2) {
            const proxy: ProxyInfo = {
              protocol: source.protocol as 'http' | 'https' | 'socks4' | 'socks5',
              host: parts[0],
              port: parseInt(parts[1])
            };
            
            if (!isNaN(proxy.port) && proxy.host) {
              allProxies.push(proxy);
            }
          }
        }
        
        this.logger.info(`Parsed ${allProxies.length} proxies from ${source.url}`);
        
      } catch (error) {
        this.logger.error(`Error fetching proxies from ${source.url}`, error);
        return [];
      }
    
    this.logger.info(`Total proxies fetched: ${allProxies.length}`);
    return allProxies;
  }
  
  /**
   * Check if a proxy is working
   */
  async checkProxy(proxy: ProxyInfo): Promise<ProxyInfo> {
    console.log('Checking proxy:', `${proxy.protocol}://${proxy.host}:${proxy.port}`, this.concurrencyLimit.activeCount, this.concurrencyLimit.pendingCount);
    try {

      // Test the proxy
      const response = await this.httpClient.get(this.CHECK_URL, {
        proxy,
        timeout: this.CHECK_TIMEOUT
      });
      
      const isWorking = response.status >= 200 && response.status < 300;

      const result: ProxyInfo = {
        ...proxy,
        isWorking,
        checkedAt: new Date(),
        responseTime: response.responseTime,
      };
      
      if (isWorking) {
        await this.cache.set(`${this.CACHE_KEY}:${proxy.protocol}://${proxy.host}:${proxy.port}`, result, this.CACHE_TTL);
      } else {
        await this.cache.del(`${this.CACHE_KEY}:${proxy.protocol}://${proxy.host}:${proxy.port}`);
      }

      this.logger.debug('Proxy check completed', {
        host: proxy.host,
        port: proxy.port,
        isWorking,
      });

      return result;

    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : String(error);

      const result: ProxyInfo = {
        ...proxy,
        isWorking: false,
        error: errorMessage,
        checkedAt: new Date()
      };

      // Cache failed result for shorter time
      // await this.cache.set(cacheKey, result, 300); // 5 minutes
      // await this.cache.del(`${this.CACHE_KEY}:${proxy.protocol}://${proxy.host}:${proxy.port}`);

      this.logger.debug('Proxy check failed', {
        host: proxy.host,
        port: proxy.port,
        error: errorMessage
      });

      return result;
    }
  }

  /**
   * Check multiple proxies concurrently
   */
  async checkProxies(proxies: ProxyInfo[]): Promise<ProxyInfo[]> {
    this.logger.info('Checking proxies', { count: proxies.length });

    const checkPromises = proxies.map(proxy =>
      this.concurrencyLimit(() => this.checkProxy(proxy))
    );

    const results = await Promise.all(checkPromises);
    const workingCount = results.filter(r => r.isWorking).length;

    this.logger.info('Proxy check completed', {
      total: proxies.length,
      working: workingCount,
      failed: proxies.length - workingCount
    });

    return results;
  }

  /**
   * Get a random working proxy from cache
   */
  async getWorkingProxy(): Promise<ProxyInfo | null> {
    try {
      // Note: This is a simplified implementation
      // In production, you'd want to maintain a working proxies list
      this.logger.warn('getWorkingProxy not fully implemented - requires proxy list management');
      return null;
    } catch (error) {
      this.logger.error('Error getting working proxy', error);
      return null;
    }
  }

  /**
   * Add proxies to check and cache
   */
  async addProxies(proxies: ProxyInfo[]): Promise<void> {
    this.logger.info('Adding proxies for validation', { count: proxies.length });
    
    // Start background validation
    this.checkProxies(proxies).catch(error => {
      this.logger.error('Error in background proxy validation', error);
    });
  }

  /**
   * Clear proxy cache
   */
  async clearCache(): Promise<void> {
    this.logger.info('Clearing proxy cache');
    // Note: Cache provider limitations - would need proper key tracking
  }

  /**
   * Shutdown service
   */
  async shutdown(): Promise<void> {
    this.logger.info('Shutting down ProxyService');
  }
}

// Export singleton instance
export const proxyService = new ProxyService();