"use server";

import { prisma } from "@/lib/db";
import { requireUserId } from "@/lib/auth-helpers";
import { projectAccessFilter } from "@/lib/access";
import { getBoard } from "@/lib/board";
import type { CategoryDTO } from "@/types/board";

/**
 * A fresh read of one board for the client's cross-device sync (see the
 * poll in board-context.tsx). Returns the exact same shape the page's
 * server component renders, so BoardProvider can diff it against its own
 * state and apply it only if something actually changed. `projectId` null
 * is Home scope -- same convention as getScheduledBoard.
 */
export async function getBoardSnapshot(projectId: string | null): Promise<CategoryDTO[]> {
  const userId = await requireUserId();
  if (projectId) {
    const project = await prisma.project.findFirst({
      where: { id: projectId, ...projectAccessFilter(userId) },
      select: { id: true },
    });
    if (!project) throw new Error("Project not found");
    return getBoard({ projectId: project.id });
  }
  return getBoard({ userId, projectId: null });
}