import { ProxyInfo } from 'libs/http/src/types';
import { ProviderConfig } from '../services/provider-registry.service';
import { getLogger } from '@stock-bot/logger';

// Create logger for this provider
const logger = getLogger('proxy-provider');

// This will run at the same time each day as when the app started
const getEvery24HourCron = (): string => {
  const now = new Date();
  const hours = now.getHours();
  const minutes = now.getMinutes();
  return `${minutes} ${hours} * * *`; // Every day at startup time
};

export const proxyProvider: ProviderConfig = {
  name: 'proxy-service',
  service: 'proxy',
  operations: {
    'fetch-and-check': async (payload: { sources?: string[] }) => {
      const { proxyService } = await import('./proxy.tasks');
      const { queueManager } = await import('../services/queue.service');

      await queueManager.drainQueue();
      
      const proxies = await proxyService.fetchProxiesFromSources();
      const proxiesCount = proxies.length;
      
      if (proxiesCount === 0) {
        logger.info('No proxies fetched, skipping job creation');
        return { proxiesFetched: 0, batchJobsCreated: 0 };
      }

      try {
        // Optimized batch size for 800k proxies
        const batchSize = 200; // Process 200 proxies per batch job
        const totalBatches = Math.ceil(proxies.length / batchSize);
        const totalDelayMs = 24 * 60 * 60 * 1000; // 24 hours
        const delayPerBatch = Math.floor(totalDelayMs / totalBatches);
        
        logger.info('Creating proxy validation batch jobs', {
          totalProxies: proxies.length,
          batchSize,
          totalBatches,
          delayPerBatch: `${(delayPerBatch / 1000 / 60).toFixed(2)} minutes`,
          estimatedCompletion: '24 hours'
        });

        // Process batches in chunks to avoid memory issues
        const batchCreationChunkSize = 50; // Create 50 batch jobs at a time
        let batchJobsCreated = 0;
        
        for (let chunkStart = 0; chunkStart < totalBatches; chunkStart += batchCreationChunkSize) {
          const chunkEnd = Math.min(chunkStart + batchCreationChunkSize, totalBatches);
          
          // Create batch jobs in parallel for this chunk
          const batchPromises = [];
          
          for (let i = chunkStart; i < chunkEnd; i++) {
            const startIndex = i * batchSize;
            const endIndex = Math.min(startIndex + batchSize, proxies.length);
            const batchProxies = proxies.slice(startIndex, endIndex);
            const delay = i * delayPerBatch;
            
            const batchPromise = queueManager.addJob({
              type: 'proxy-batch-validation',
              service: 'proxy',
              provider: 'proxy-service',
              operation: 'process-proxy-batch',
              payload: {
                proxies: batchProxies,
                batchIndex: i,
                totalBatches,
                source: 'fetch-and-check'
              },
              priority: 3
            }, { 
              delay: delay,
              jobId: `proxy-batch-${i}-${Date.now()}`
            });
            
            batchPromises.push(batchPromise);
          }
          
          // Wait for this chunk to complete
          const results = await Promise.allSettled(batchPromises);
          const successful = results.filter(r => r.status === 'fulfilled').length;
          const failed = results.filter(r => r.status === 'rejected').length;
          
          batchJobsCreated += successful;
          
          logger.info('Batch chunk created', {
            chunkStart: chunkStart + 1,
            chunkEnd,
            totalChunks: Math.ceil(totalBatches / batchCreationChunkSize),
            successful,
            failed,
            totalCreated: batchJobsCreated,
            progress: `${((chunkEnd / totalBatches) * 100).toFixed(1)}%`
          });
          
          // Small delay between chunks to prevent overwhelming Redis
          if (chunkEnd < totalBatches) {
            await new Promise(resolve => setTimeout(resolve, 100));
          }
        }

        logger.info('All batch jobs creation completed', {
          totalProxies: proxies.length,
          batchJobsCreated,
          totalBatches,
          avgProxiesPerBatch: Math.floor(proxies.length / totalBatches),
          estimatedDuration: '24 hours'
        });

        return {
          proxiesFetched: proxiesCount,
          batchJobsCreated,
          totalBatches,
          avgProxiesPerBatch: Math.floor(proxies.length / totalBatches)
        };

      } catch (error) {
        logger.error('Failed to create batch jobs', {
          proxiesCount,
          error: error instanceof Error ? error.message : String(error)
        });
        throw error;
      }
    },

    'process-proxy-batch': async (payload: {
      proxies: ProxyInfo[],
      batchIndex: number,
      totalBatches: number,
      source: string
    }) => {
      const { queueManager } = await import('../services/queue.service');
      
      logger.info('Processing proxy batch', {
        batchIndex: payload.batchIndex,
        batchSize: payload.proxies.length,
        totalBatches: payload.totalBatches,
        progress: `${((payload.batchIndex + 1) / payload.totalBatches * 100).toFixed(2)}%`
      });

      const batchDelayMs = 15 * 60 * 1000; // 15 minutes per batch
      const delayPerProxy = Math.floor(batchDelayMs / payload.proxies.length);
      
      logger.info('Batch timing calculated', {
        batchIndex: payload.batchIndex,
        proxiesInBatch: payload.proxies.length,
        batchDurationMinutes: 30,
        delayPerProxySeconds: Math.floor(delayPerProxy / 1000),
        delayPerProxyMs: delayPerProxy
      });
      
      // Use BullMQ's addBulk for better performance
      const jobsToCreate = payload.proxies.map((proxy, i) => ({
        name: 'proxy-validation',
        data: {
          type: 'proxy-validation',
          service: 'proxy',
          provider: 'proxy-service',
          operation: 'check-proxy',
          payload: {
            proxy: proxy,
            source: payload.source,
            batchIndex: payload.batchIndex,
            proxyIndexInBatch: i,
            totalBatch: payload.totalBatches
          },
          priority: 2
        },
        opts: {
          delay: i * delayPerProxy,
          jobId: `proxy-${proxy.host}-${proxy.port}-batch${payload.batchIndex}-${Date.now()}-${i}`,
          removeOnComplete: 3,
          removeOnFail: 5
        }
      }));

      try {
        const jobs = await queueManager.addBulk(jobsToCreate);
        
        logger.info('Batch processing completed successfully', {
          batchIndex: payload.batchIndex,
          totalProxies: payload.proxies.length,
          jobsCreated: jobs.length,
          batchDelay: '15 minutes',
          progress: `${((payload.batchIndex + 1) / payload.totalBatches * 100).toFixed(2)}%`
        });

        return {
          batchIndex: payload.batchIndex,
          totalProxies: payload.proxies.length,
          jobsCreated: jobs.length,
          jobsFailed: 0
        };
      } catch (error) {
        logger.error('Failed to create validation jobs for batch', {
          batchIndex: payload.batchIndex,
          batchSize: payload.proxies.length,
          error: error instanceof Error ? error.message : String(error)
        });
        
        return {
          batchIndex: payload.batchIndex,
          totalProxies: payload.proxies.length,
          jobsCreated: 0,
          jobsFailed: payload.proxies.length
        };
      }
    },

    'check-proxy': async (payload: { 
      proxy: ProxyInfo, 
      source?: string,
      batchIndex?: number,
      proxyIndexInBatch?: number,
      totalBatch?: number
    }) => {
      const { checkProxy } = await import('./proxy.tasks');
      
      logger.debug('Checking individual proxy', {
        proxy: `${payload.proxy.host}:${payload.proxy.port}`,
        batchIndex: payload.batchIndex,
        proxyIndex: payload.proxyIndexInBatch,
        source: payload.source
      });
      
      const result = await checkProxy(payload.proxy);
      
      logger.debug('Proxy check completed', {
        proxy: `${payload.proxy.host}:${payload.proxy.port}`,
        isWorking: result.isWorking,
        responseTime: result.responseTime,
        batchIndex: payload.batchIndex
      });
      
      return {
        result: result,
        batchInfo: {
          batchIndex: payload.batchIndex,
          proxyIndex: payload.proxyIndexInBatch,
          total: payload.totalBatch,
          source: payload.source
        }
      };
    }
  },
  
  scheduledJobs: [
    {
      type: 'proxy-maintenance',
      operation: 'fetch-and-check',
      payload: {},
      cronPattern: getEvery24HourCron(), // Every 15 minutes
      priority: 5,
      immediately: true,
      description: 'Fetch and validate proxy list from sources'
    }
  ]
};