frontend/src/hooks/useAIAdaptation.ts

import { useEffect } from 'react';
import axios from 'axios';
import { useStore } from '../store';

// Debounce helper
let debounceTimer: ReturnType<typeof setTimeout>;

export function useAIAdaptation() {
  const {
    waveAmplitude, temperature, waveExpansion, finScale,
    setAIResult, setLoadingAI, setFluidField,
  } = useStore();

  // Call /api/adapt-fins whenever ocean parameters change (debounced 1.5s)
  useEffect(() => {
    clearTimeout(debounceTimer);
    debounceTimer = setTimeout(async () => {
      setLoadingAI(true);
      try {
        const [finRes, fluidRes] = await Promise.all([
          axios.post('/api/adapt-fins', {
            waveAmplitude,
            temperature,
            waveExpansion,
            currentFinScale: finScale,
          }),
          axios.post('/api/fluid-state', {
            waveAmplitude,
            waveExpansion,
            time: Date.now() / 1000,
          }),
        ]);

        setAIResult(finRes.data);
        setFluidField(fluidRes.data.field);
      } catch (err) {
        console.warn('AI adaptation error:', err);
      } finally {
        setLoadingAI(false);
      }
    }, 1500);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [waveAmplitude, temperature, waveExpansion]);
}