/**
 * Custom hook for fetching trajectory data for a celestial body
 */
import { useState, useEffect } from 'react';
import { fetchCelestialPositions } from '../utils/api';
import type { CelestialBody, Position } from '../types';

export function useTrajectory(body: CelestialBody | null) {
  const [trajectoryPositions, setTrajectoryPositions] = useState<Position[]>([]);
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    if (!body || body.type !== 'probe') {
      setTrajectoryPositions([]);
      return;
    }

    async function loadTrajectory() {
      if (!body) return;

      try {
        setLoading(true);

        // Fetch positions for the last 30 days
        // Align to UTC midnight to leverage caching
        const now = new Date();
        now.setUTCHours(0, 0, 0, 0);
        
        const endTime = now.toISOString();
        const startTime = new Date(now.getTime() - 30 * 24 * 60 * 60 * 1000).toISOString();

        const data = await fetchCelestialPositions(startTime, endTime, '1d');

        // Find the body's data and extract positions
        const bodyData = data.bodies.find((b) => b.id === body.id);
        if (bodyData && bodyData.positions.length > 0) {
          setTrajectoryPositions(bodyData.positions);
        } else {
          // Fallback to current position if no historical data
          setTrajectoryPositions(body.positions);
        }
      } catch (err) {
        console.error('Failed to fetch trajectory data:', err);
        // Fallback to current position
        if (body) {
          setTrajectoryPositions(body.positions);
        }
      } finally {
        setLoading(false);
      }
    }

    loadTrajectory();
  }, [body?.id, body?.type]);

  return { trajectoryPositions, loading };
}