Mav-Mobile-UI/src/hooks/useSightingFeed.ts

import { useEffect, useMemo, useRef, useState } from "react";
import { useQuery } from "@tanstack/react-query";
import type { SightingType } from "../types/types";
import { useSoundOnChange } from "react-sounds";
import { useSoundContext } from "../context/SoundContext";
import { getSoundFileURL } from "../utils/utils";
import switchSound from "../assets/sounds/ui/switch.mp3";

async function fetchSighting(
  url: string | undefined,
  ref: number
): Promise<SightingType> {
  const res = await fetch(`${url}${ref}`);
  if (!res.ok) throw new Error(String(res.status));
  return res.json();
}

export function useSightingFeed(url: string | undefined) {
  const { state } = useSoundContext();
  const [sightings, setSightings] = useState<SightingType[]>([]);
  const [selectedRef, setSelectedRef] = useState<number | null>(null);
  const [sessionStarted, setSessionStarted] = useState(false);
  const [sessionList, setSessionList] = useState<SightingType[]>([]);
  const mostRecent = sightings[0] ?? null;
  const latestRef = mostRecent?.ref ?? null;
  const [selectedSighting, setSelectedSighting] = useState<SightingType | null>(
    null
  );
  const first = useRef(true);

  const trigger = useMemo(() => {
    if (latestRef == null) return null;
    if (first.current) {
      first.current = false;
      return Symbol("skip");
    }
    return latestRef;
  }, [latestRef]);
  const soundSrc = useMemo(() => {
    return getSoundFileURL(state.sightingSound) ?? switchSound;
  }, [state.sightingSound]);

  //use latestref instead of trigger to revert back
  useSoundOnChange(soundSrc, trigger, {
    volume: 1,
  });

  const currentRef = useRef<number>(-1);
  const lastValidTimestamp = useRef<number>(Date.now());

  const query = useQuery({
    queryKey: ["sighting-feed", url],
    enabled: !!url,
    queryFn: () => fetchSighting(url, currentRef.current),

    refetchInterval: (q) => {
      const data = q.state.data as SightingType | undefined;
      const now = Date.now();

      if (data && data.ref !== -1) {
        lastValidTimestamp.current = now;
        return 100;
      }

      if (now - lastValidTimestamp.current > 60_000) {
        currentRef.current = -1;
        lastValidTimestamp.current = now;
      }
      return 400;
    },
    refetchIntervalInBackground: true,
    refetchOnWindowFocus: false,
    retry: false,
    staleTime: 0,
  });

  useEffect(() => {
    if (sessionStarted) {
      if (!mostRecent) return;
      setSessionList([...sessionList, mostRecent]);
    }
  }, [mostRecent, sessionList, sessionStarted]);

  useEffect(() => {
    const data = query.data;
    if (!data) return;

    const now = Date.now();

    if (data.ref === -1) {
      // setSightings((prev) => {
      //   if (prev[0]?.ref === data.ref) return prev;
      //   const dedupPrev = prev.filter((s) => s.ref !== data.ref);
      //   return [data, ...dedupPrev].slice(0, 7);
      // });

      return;
    }

    // if (Notification.permission === "granted") {
    //   new Notification("New Sighting!", {
    //     body: `Ref: ${data.ref}`,
    //     icon: "/MAV-blue.svg",
    //   });
    // }

    currentRef.current = data.ref;
    lastValidTimestamp.current = now;

    setSightings((prev) => {
      if (prev[0]?.ref === data.ref) return prev;
      const dedupPrev = prev.filter((s) => s.ref !== data.ref);
      return [data, ...dedupPrev].slice(0, 7);
    });

    setSelectedRef(data.ref);
  }, [query.data]);

  useEffect(() => {
    if (query.error) {
      // console.error("Sighting feed error:", query.error);
    }
  }, [query.error]);
  return {
    sightings,
    selectedRef,
    setSelectedRef,
    mostRecent,
    selectedSighting,
    sessionList,
    sessionStarted,
    setSessionStarted,
    setSelectedSighting,
    data: query.data,
    isLoading: query.isLoading,
    isFetching: query.isFetching,
    isError: query.isError,
    error: query.error as Error | null,
    refetch: query.refetch,
  };
}