All files / src/hooks useRevenueForecast.ts

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/**
 * useRevenueForecast Hook
 *
 * Fetches revenue forecast predictions for planning insights.
 */

"use client";

import { useState, useEffect, useCallback } from "react";

export interface ForecastPrediction {
  date: string;
  predicted: number;
  lower: number;
  upper: number;
}

export interface RevenueForecast {
  predictions: ForecastPrediction[];
  confidence: number;
  growthRate: number;
}

interface UseRevenueForecastResult {
  forecast: RevenueForecast | null;
  isLoading: boolean;
  error: Error | null;
  daysAhead: number;
  setDaysAhead: (days: number) => void;
  refetch: () => Promise<void>;
}

const emptyForecast: RevenueForecast = {
  predictions: [],
  confidence: 0,
  growthRate: 0,
};

export function useRevenueForecast(initialDaysAhead: number = 7): UseRevenueForecastResult {
  const [forecast, setForecast] = useState<RevenueForecast | null>(null);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState<Error | null>(null);
  const [daysAhead, setDaysAhead] = useState(initialDaysAhead);

  const fetchForecast = useCallback(async () => {
    try {
      setIsLoading(true);
      setError(null);

      const response = await fetch(`/api/admin/analytics/revenue/forecast?days=${daysAhead}`);

      if (!response.ok) {
        throw new Error(`Failed to fetch revenue forecast: ${response.status}`);
      }

      const result = await response.json();

      if (result.success && result.data) {
        setForecast(result.data);
      } else {
        setForecast(emptyForecast);
      }
    } catch (err) {
      setError(err instanceof Error ? err : new Error("Unknown error"));
      setForecast(emptyForecast);
    } finally {
      setIsLoading(false);
    }
  }, [daysAhead]);

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

  return {
    forecast,
    isLoading,
    error,
    daysAhead,
    setDaysAhead,
    refetch: fetchForecast,
  };
}

export default useRevenueForecast;