signal-batch/frontend/src/features/vessel-tracks/hooks/useVesselTracks.ts

import { useCallback } from 'react'
import { gisApi, type VesselTrackResult } from '../../../api/gisApi'
import { useTrackStore } from '../stores/trackStore'
import type { TrackSegment } from '../../vessel-map'

/** API 응답 → 내부 TrackSegment 변환 */
function toTrackSegment(r: VesselTrackResult): TrackSegment {
  return {
    vesselId: r.vesselId,
    nationalCode: r.nationalCode,
    shipKindCode: r.shipKindCode,
    shipName: r.shipName,
    geometry: r.geometry as [number, number][],
    // 백엔드가 문자열 배열로 전송 → 숫자 ms 변환
    timestampsMs: r.timestamps.map((t) => {
      const n = Number(t)
      // 초 단위(10자리)면 ×1000, ms 단위(13자리)면 그대로
      return n < 1e12 ? n * 1000 : n
    }),
    speeds: r.speeds,
    totalDistance: r.totalDistance,
    avgSpeed: r.avgSpeed,
    maxSpeed: r.maxSpeed,
    pointCount: r.pointCount,
  }
}

/** 선박 항적 조회 훅 */
export function useVesselTracks() {
  const setTracks = useTrackStore((s) => s.setTracks)
  const setLoading = useTrackStore((s) => s.setLoading)
  const clearTracks = useTrackStore((s) => s.clearTracks)

  const fetchTracks = useCallback(
    async (mmsiList: string[], startTime: string, endTime: string) => {
      setLoading(true)
      try {
        const data = await gisApi.getVesselTracks(mmsiList, startTime, endTime)
        const segments = data.map(toTrackSegment)
        setTracks(segments)
      } catch (err) {
        console.error('[useVesselTracks] fetch failed:', err)
        clearTracks()
      } finally {
        setLoading(false)
      }
    },
    [setTracks, setLoading, clearTracks],
  )

  return { fetchTracks, clearTracks }
}