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> {
  try {
    const preferences = await prisma.userPreference.findUnique({
      where: { userProfileId },
    });
    return { theme: preferences?.theme ?? "SYSTEM" };
  } catch (err) {
    // Rethrown as-is — `wrapAsyncHandler`/the error middleware (which
    // already logs it, see `error-logger.ts`) is what actually handles it,
    // this service layer just isn't allowed a bare `await` per the repo's
    // async/try-catch convention.
    throw err;
  }
}

/**
 * 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> {
  try {
    const preferences = await prisma.userPreference.upsert({
      where: { userProfileId },
      create: { userProfileId, theme },
      update: { theme },
    });
    return { theme: preferences.theme };
  } catch (err) {
    throw err; // see getPreferences()'s catch comment above
  }
}