// frontend/src/api/hooks/useTraining.ts
/**
 * Training Operations Hooks
 */

import { useState, useCallback, useEffect } from 'react';
import { trainingService } from '../services';
import type {
  TrainingJobRequest,
  TrainingJobResponse,
  ModelInfo,
  ModelTrainingStats,
  SingleProductTrainingRequest,
} from '../types';

interface UseTrainingOptions {
  disablePolling?: boolean; // New option to disable HTTP status polling
}

export const useTraining = (options: UseTrainingOptions = {}) => {

  const { disablePolling = false } = options;
  const [jobs, setJobs] = useState<TrainingJobResponse[]>([]);
  const [currentJob, setCurrentJob] = useState<TrainingJobResponse | null>(null);
  const [models, setModels] = useState<ModelInfo[]>([]);
  const [stats, setStats] = useState<ModelTrainingStats | null>(null);
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const startTrainingJob = useCallback(async (
    tenantId: string,
    request: TrainingJobRequest
  ): Promise<TrainingJobResponse> => {
    try {
      setIsLoading(true);
      setError(null);

      const job = await trainingService.startTrainingJob(tenantId, request);
      setCurrentJob(job);
      setJobs(prev => [job, ...prev]);
      
      return job;
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Failed to start training job';
      setError(message);
      throw error;
    } finally {
      setIsLoading(false);
    }
  }, []);

  const startSingleProductTraining = useCallback(async (
    tenantId: string,
    request: SingleProductTrainingRequest
  ): Promise<TrainingJobResponse> => {
    try {
      setIsLoading(true);
      setError(null);

      const job = await trainingService.startSingleProductTraining(tenantId, request);
      setCurrentJob(job);
      setJobs(prev => [job, ...prev]);
      
      return job;
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Failed to start product training';
      setError(message);
      throw error;
    } finally {
      setIsLoading(false);
    }
  }, []);

  const getTrainingJobStatus = useCallback(async (
    tenantId: string,
    jobId: string
  ): Promise<TrainingJobResponse> => {
    try {
      const job = await trainingService.getTrainingJobStatus(tenantId, jobId);
      
      // Update job in state
      setJobs(prev => prev.map(j => j.job_id === jobId ? job : j));
      if (currentJob?.job_id === jobId) {
        setCurrentJob(job);
      }
      
      return job;
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Failed to get job status';
      setError(message);
      throw error;
    }
  }, [currentJob]);

  const cancelTrainingJob = useCallback(async (
    tenantId: string,
    jobId: string
  ): Promise<void> => {
    try {
      setIsLoading(true);
      setError(null);

      await trainingService.cancelTrainingJob(tenantId, jobId);
      
      // Update job status in state
      setJobs(prev => prev.map(j => 
        j.job_id === jobId ? { ...j, status: 'cancelled' } : j
      ));
      if (currentJob?.job_id === jobId) {
        setCurrentJob({ ...currentJob, status: 'cancelled' });
      }
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Failed to cancel job';
      setError(message);
      throw error;
    } finally {
      setIsLoading(false);
    }
  }, [currentJob]);

  const getTrainingJobs = useCallback(async (tenantId: string): Promise<TrainingJobResponse[]> => {
    try {
      setIsLoading(true);
      setError(null);

      const response = await trainingService.getTrainingJobs(tenantId);
      setJobs(response.data);
      
      return response.data;
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Failed to get training jobs';
      setError(message);
      throw error;
    } finally {
      setIsLoading(false);
    }
  }, []);

  const getModels = useCallback(async (tenantId: string): Promise<ModelInfo[]> => {
    try {
      setIsLoading(true);
      setError(null);

      const response = await trainingService.getModels(tenantId);
      setModels(response.data);
      
      return response.data;
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Failed to get models';
      setError(message);
      throw error;
    } finally {
      setIsLoading(false);
    }
  }, []);

  const validateTrainingData = useCallback(async (tenantId: string): Promise<{
    is_valid: boolean;
    message: string;
    details?: any;
  }> => {
    try {
      setIsLoading(true);
      setError(null);

      const result = await trainingService.validateTrainingData(tenantId);
      return result;
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Data validation failed';
      setError(message);
      throw error;
    } finally {
      setIsLoading(false);
    }
  }, []);

  const getTrainingStats = useCallback(async (tenantId: string): Promise<ModelTrainingStats> => {
    try {
      setIsLoading(true);
      setError(null);

      const trainingStats = await trainingService.getTrainingStats(tenantId);
      setStats(trainingStats);
      
      return trainingStats;
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Failed to get training stats';
      setError(message);
      throw error;
    } finally {
      setIsLoading(false);
    }
  }, []);

  useEffect(() => {
    // Skip polling if disabled or no running jobs
    if (disablePolling) {
      console.log('🚫 HTTP status polling disabled - using WebSocket instead');
      return;
    }

    const runningJobs = jobs.filter(job => job.status === 'running' || job.status === 'pending');
    
    if (runningJobs.length === 0) return;

    console.log('🔄 Starting HTTP status polling for', runningJobs.length, 'jobs');

    const interval = setInterval(async () => {
      for (const job of runningJobs) {
        try {
          const tenantId = job.tenant_id;
          await getTrainingJobStatus(tenantId, job.job_id);
        } catch (error) {
          console.error('Failed to refresh job status:', error);
        }
      }
    }, 5000); // Refresh every 5 seconds

    return () => {
      console.log('🛑 Stopping HTTP status polling');
      clearInterval(interval);
    };
  }, [jobs, getTrainingJobStatus, disablePolling]);


  return {
    jobs,
    currentJob,
    models,
    stats,
    isLoading,
    error,
    startTrainingJob,
    startSingleProductTraining,
    getTrainingJobStatus,
    cancelTrainingJob,
    getTrainingJobs,
    getModels,
    validateTrainingData,
    getTrainingStats,
    clearError: () => setError(null),
  };
};