"use client";

import { useMutation, useQueryClient } from "@tanstack/react-query";

interface ToggleWatchedVars {
  movieId: string;
  watched: boolean;
}

async function toggleWatched({ movieId, watched }: ToggleWatchedVars) {
  const res = await fetch(`/api/movies/${movieId}/watched`, {
    method: "PATCH",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ watched }),
  });

  if (!res.ok) {
    const data = await res.json().catch(() => ({}));
    throw new Error(data.error || "Failed to update watched status");
  }

  return res.json();
}

export function useToggleWatched(groupId: string) {
  const queryClient = useQueryClient();

  return useMutation({
    mutationFn: toggleWatched,
    onSuccess: () => {
      void queryClient.invalidateQueries({ queryKey: ["group-movies", groupId] });
    },
  });
}