import { useState, useEffect, useCallback } from 'react';
import { analyticsClient } from '../analytics/client';
import type { DateRangeParams } from '../types';

export interface UseAnalyticsDashboardOptions {
  dateRange?: DateRangeParams;
  autoRefresh?: boolean;
  refreshInterval?: number; // in milliseconds
}

export const useAnalyticsDashboard = (options: UseAnalyticsDashboardOptions = {}) => {
  const {
    dateRange = analyticsClient.getLastNDaysRange(30),
    autoRefresh = false,
    refreshInterval = 60000, // 1 minute
  } = options;

  const [data, setData] = useState<any>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<Error | null>(null);
  const [lastUpdated, setLastUpdated] = useState<Date | null>(null);

  const fetchData = useCallback(async () => {
    try {
      setLoading(true);
      setError(null);

      const result = await analyticsClient.getBatchAnalytics(dateRange);
      setData(result);
      setLastUpdated(new Date());
    } catch (err) {
      setError(err as Error);
      console.error('Failed to fetch analytics:', err);
    } finally {
      setLoading(false);
    }
  }, [dateRange]);

  useEffect(() => {
    fetchData();

    if (autoRefresh) {
      const interval = setInterval(fetchData, refreshInterval);
      return () => clearInterval(interval);
    }
  }, [fetchData, autoRefresh, refreshInterval]);

  const refresh = useCallback(() => {
    analyticsClient.clearCache();
    return fetchData();
  }, [fetchData]);

  return {
    data,
    loading,
    error,
    lastUpdated,
    refresh,
  };
};

/**
 * Hook for product recommendations based on affinity
 */
export const useProductRecommendations = (productId: number, limit: number = 10) => {
  const [recommendations, setRecommendations] = useState<any[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<Error | null>(null);

  useEffect(() => {
    const fetchRecommendations = async () => {
      try {
        setLoading(true);
        const response = await analyticsClient.getProductAffinity(productId, limit);
        setRecommendations(response.data || []);
      } catch (err) {
        setError(err as Error);
      } finally {
        setLoading(false);
      }
    };

    if (productId) {
      fetchRecommendations();
    }
  }, [productId, limit]);

  return { recommendations, loading, error };
};

/**
 * Hook for customer journey visualization
 */
export const useCustomerJourney = (sessionId: string | null) => {
  const [journey, setJourney] = useState<any[]>([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<Error | null>(null);

  useEffect(() => {
    const fetchJourney = async () => {
      if (!sessionId) return;

      try {
        setLoading(true);
        const response = await analyticsClient.getCustomerJourney(sessionId);
        setJourney(response.data || []);
      } catch (err) {
        setError(err as Error);
      } finally {
        setLoading(false);
      }
    };

    fetchJourney();
  }, [sessionId]);

  return { journey, loading, error };
};

/**
 * Hook for real-time conversion funnel
 */
export const useConversionFunnel = (dateRange?: DateRangeParams) => {
  const [funnel, setFunnel] = useState<any>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<Error | null>(null);

  const fetchFunnel = useCallback(async () => {
    try {
      setLoading(true);
      const response = await analyticsClient.getConversionFunnel(dateRange);
      setFunnel(response.data);
    } catch (err) {
      setError(err as Error);
    } finally {
      setLoading(false);
    }
  }, [dateRange]);

  useEffect(() => {
    fetchFunnel();
  }, [fetchFunnel]);

  const refresh = useCallback(() => {
    analyticsClient.clearCache();
    return fetchFunnel();
  }, [fetchFunnel]);

  return { funnel, loading, error, refresh };
};