import type { PreferencesView, ThemePreference } from "@batch-cooking/shared";
import { prisma } from "../../db/prisma.js";

/**
 * A profile's personalization preferences. `SYSTEM` (the schema default)
 * is returned both when a row already says so *and* when there's no row
 * yet at all — same "absent means the default" philosophy as
 * `dietId`/allergies elsewhere in `profile.service.ts`, no row is created
 * just to read it.
 */
export async function getPreferences(userProfileId: number): Promise<PreferencesView> {
  const preferences = await prisma.userPreference.findUnique({ where: { userProfileId } });
  return { theme: preferences?.theme ?? "SYSTEM" };
}

/**
 * Sets a profile's theme preference, creating its preferences row on first
 * write (an `upsert` rather than requiring a separate "create" step — a
 * profile never needs to explicitly initialize this row before using it).
 */
export async function updatePreferences(
  userProfileId: number,
  theme: ThemePreference,
): Promise<PreferencesView> {
  const preferences = await prisma.userPreference.upsert({
    where: { userProfileId },
    create: { userProfileId, theme },
    update: { theme },
  });
  return { theme: preferences.theme };
}